Patent Publication Number: US-2005125933-A1

Title: Detonative cleaning apparatus

Description:
BACKGROUND OF THE INVENTION  
      (1) Field of the Invention  
      The invention relates to industrial equipment. More particularly, the invention relates to the detonative cleaning of industrial equipment.  
      (2) Description of the Related Art  
      Surface fouling is a major problem in industrial equipment. Such equipment includes furnaces (coal, oil, waste, etc.), boilers, gasifiers, reactors, heat exchangers, and the like. Typically the equipment involves a vessel containing internal heat transfer surfaces that are subjected to fouling by accumulating particulate such as soot, ash, minerals and other products and byproducts of combustion, more integrated buildup such as slag and/or fouling, and the like. Such particulate build-up may progressively interfere with plant operation, reducing efficiency and throughput and potentially causing damage. Cleaning of the equipment is therefore highly desirable and is attended by a number of relevant considerations. Often direct access to the fouled surfaces is difficult. Additionally, to maintain revenue it is desirable to minimize industrial equipment downtime and related costs associated with cleaning. A variety of technologies have been proposed. By way of example, various technologies have been proposed in U.S. Pat. Nos. 5,494,004 and 6,438,191 and U.S. patent application publication 2002/0112638. Additional technology is disclosed in Huque, Z. Experimental Investigation of Slag Removal Using Pulse Detonation Wave Technique, DOE/HBCU/OMI Annual Symposium, Miami, Fla., Mar. 16-18, 1999. Particular blast wave techniques are described by Hanjalić and Smajević in their publications: Hanjalić, K. and Smajević, I., Further Experience Using Detonation Waves for Cleaning Boiler Heating Surfaces, International Journal of Energy Research Vol. 17, 583-595 (1993) and Hanjalić, K. and Smajević, I., Detonation-Wave Technique for On-load Deposit Removal from Surfaces Exposed to Fouling: Parts I and II, Journal of Engineering for Gas Turbines and Power, Transactions of the ASME, Vol. 1, 116 223-236, January 1994. Such systems are also discussed in Yugoslav patent publications P 1756/88 and P 1728/88. Such systems are often identified as “soot blowers” after an exemplary application for the technology.  
      Nevertheless, there remain opportunities for further improvement in the field.  
     SUMMARY OF THE INVENTION  
      One aspect of the invention involves an apparatus for cleaning a surface within a vessel. A vessel wall separates a vessel exterior from a vessel interior and has a wall aperture. The apparatus includes a source of fuel and oxidizer and an igniter for initiating a reaction of the fuel and oxidizer. An elongate conduit has first and second ends and is positioned to direct a gas flow of the reacted or reacting fuel and oxidizer through the wall aperture and discharge from the second end. The conduit includes a number of segments secured end-to-end.  
      In various implementations, at least three of the conduit segments have lengths along a gas flowpath of 1-3 m and characteristic internal cross-sectional areas of 0.006-0.3 m 2 . At least three of the segments may each include a tubular body having first and second ends and first and second bolting flanges respectively proximate the first and second ends. A nozzle assembly may extend at least partially through the vessel wall. At least one of the segments may be an elbow. The conduit may consist essentially of three portions: an essentially straight first portion; an essentially straight second portion upstream of the first portion; and a third non-straight portion between the first and second portions. The second and third portions may have essentially similar internal cross-sections. The first portion may include downstream, upstream, and transition portions. The downstream portion internal cross-section may be essentially similar to that of the second and third portions. The upstream portion internal cross-section may be smaller than that of the downstream portion. The transition portion internal cross-section may transition from essentially similar to that of the upstream portion to essentially similar to that of the downstream portion. The first and second portions may be parallel and offset. The first and second portions may be oriented at a non-zero angle (e.g., 20°-160°) to each other.  
      Another aspect of the invention involves a method for configuring a detonative cleaning apparatus for cleaning surfaces within a vessel. A suitable combustion conduit cross-sectional area is determined. A suitable combustion conduit length is determined. An appropriate path for the combustion conduit is determined in view of environmental considerations. An appropriate combination of conduit segments for forming the combustion conduit is determined so as to be routed along the appropriate path.  
      In various implementations, the segments may be selected from a number of pre-established conduit segment configurations.  
      The segments may include at least one straight segment and at least one curved segment. At least some of the segments may each have a tubular body with first and second ends and first and second attachment flanges proximate the first and second ends. An appropriate predetonator configuration may be determined. Drawings of the so-configured apparatus may be made and the so-configured apparatus may be assembled.  
      The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a view of an industrial furnace associated with several soot blowers positioned to clean a level of the furnace.  
       FIG. 2  is a side view of one of the blowers of  FIG. 1 .  
       FIG. 3  is a partially cut-away side view of an upstream end of the blower of  FIG. 2 .  
       FIG. 4  is a longitudinal sectional view of a main combustor segment of the soot blower of  FIG. 2 .  
       FIG. 5  is an end view of the segment of  FIG. 4 .  
       FIG. 6  is a view of a conduit segment support trolley of the system of  FIG. 1 .  
       FIG. 7  is a side view of an alternate combustion conduit.  
       FIG. 8  is a view of the combustion conduit of  FIG. 7  with an upper external tube pack and various support features removed to show detail.  
       FIG. 9  is a top view of an alternate combustion conduit.  
       FIG. 10  is a top view of an alternate combustion conduit.  
       FIG. 11  is a side view of the combustion conduit of  FIG. 10 .  
       FIG. 12  is a view of representative sizes of conduit segments in a conduit segment kit. 
    
    
      Like reference numbers and designations in the various drawings indicate like elements.  
     DETAILED DESCRIPTION  
       FIG. 1  shows a furnace  20  having an exemplary three associated soot blowers  22 . In the illustrated embodiment, the furnace vessel is formed as a right parallelepiped and the soot blowers are all associated with a single common wall  24  of the vessel and are positioned at like height along the wall. Other configurations are possible (e.g., a single soot blower, one or more soot blowers on each of multiple levels, and the like).  
      Each soot blower  22  includes an elongate combustion conduit  26  extending from an upstream distal end  28  away from the furnace wall  24  to a downstream proximal end  30  closely associated with the wall  24 . Optionally, however, the end  30  may be well within the furnace. In operation of each soot blower, combustion of a fuel/oxidizer mixture within the conduit  26  is initiated proximate the upstream end (e.g., within an upstreammost 10% of a conduit length) to produce a detonation wave which is expelled from the downstream end as a shock wave along with associated combustion gases for cleaning surfaces within the interior volume of the furnace. Each soot blower may be associated with a fuel/oxidizer source  32 . Such source or one or more components thereof may be shared amongst the various soot blowers. An exemplary source includes a liquified or compressed gaseous fuel cylinder  34  and an oxygen cylinder  36  in respective containment structures  38  and  40 . In the exemplary embodiment, the oxidizer is a first oxidizer such as essentially pure oxygen. A second oxidizer may be in the form of shop air delivered from a central air source  42 . In the exemplary embodiment, air is stored in an air accumulator  44 . Fuel, expanded from that in the cylinder  34  is generally stored in a fuel accumulator  46 . Each exemplary source  32  is coupled to the associated conduit  26  by appropriate plumbing below. Similarly, each soot blower includes a spark box  50  for initiating combustion of the fuel oxidizer mixture and which, along with the source  32 , is controlled by a control and monitoring system (not shown).  FIG. 1  further shows the wall  24  as including a number of ports for inspection and/or measurement. Exemplary ports include an optical monitoring port  54  and a temperature monitoring port  56  associated with each soot blower  22  for respectively receiving an infrared and/or visible light video camera and thermocouple probe for viewing the surfaces to be cleaned and monitoring internal temperatures. Other probes/monitoring/sampling may be utilized, including pressure monitoring, composition sampling, and the like.  
       FIG. 2  shows further details of an exemplary soot blower  22 . The exemplary detonation conduit  26  is formed with a main body portion formed by a series of doubly flanged conduit sections or segments  60  arrayed from upstream to downstream and a downstream nozzle conduit section or segment  62  having a downstream portion  64  extending through an aperture  66  in the wall and ending in the downstream end or outlet  30  exposed to the furnace interior  68 . The term nozzle is used broadly and does not require the presence of any aerodynamic contraction, expansion, or combination thereof. Exemplary conduit segment material is metallic (e.g., stainless steel). The outlet  30  may be located further within the furnace if appropriate support and cooling are provided.  FIG. 2  further shows furnace interior tube bundles  70 , the exterior surfaces of which are subject to fouling. In the exemplary embodiment, each of the conduit segments  60  is supported on an associated trolley  72 , the wheels of which engage a track system  74  along the facility floor  76 . The exemplary track system includes a pair of parallel rails engaging concave peripheral surfaces of the trolley wheels. The exemplary segments  60  are of similar length L 1  and are bolted end-to-end by associated arrays of bolts in the bolt holes of their respective flanges. Similarly, the downstream flange of the downstreammost of the segments  60  is bolted to the upstream flange of the nozzle  62 . In the exemplary embodiment, a reaction strap  80  (e.g., cotton or thermally/structurally robust synthetic) in series with one or more metal coil reaction springs  82  is coupled to this last mated flange pair and connects the combustion conduit to an environmental structure such as the furnace wall for resiliently absorbing reaction forces associated with discharging of the soot blower and ensuring correct placement of the combustion conduit for subsequent firings. Optionally, additional damping (not shown) may be provided. The reaction strap/spring combination may be formed as a single length or a loop. In the exemplary embodiment, this combined downstream section has an overall length L 2 . Alternative resilient recoil absorbing means may include non-metal or non-coil springs or rubber or other elastomeric elements advantageously at least partially elastically deformed in tension, compression, and/or shear, pneumatic recoil absorbers, and the like.  
      Extending downstream from the upstream end  28  is a predetonator conduit section/segment  84  which also may be doubly flanged and has a length L 3 . The predetonator conduit segment  84  has a characteristic internal cross-sectional area (transverse to an axis/centerline  500  of the conduit) which is smaller than a characteristic internal cross-sectional area (e.g., mean, median, mode, or the like) of the downstream portion ( 60 ,  62 ) of the combustion conduit. In an exemplary embodiment involving circular sectioned conduit segments, the predetonator cross-sectional area is a characterized by a diameter of between 8 cm and 12 cm whereas the downstream portion is characterized by a diameter of between 20 cm and 40 cm. Accordingly, exemplary cross-sectional area ratios of the downstream portion to the predetonator segment are between 1:1 and 10:1, more narrowly, 2:1 and 10:1. An overall length L between ends  28  and  30  may be  1-15  m, more narrowly, 5-15 m. In the exemplary embodiment, a transition conduit segment  86  extends between the predetonator segment  84  and the upstreammost segment  60 . The segment  86  has upstream and downstream flanges sized to mate with the respective flanges of the segments  84  and  60  has an interior surface which provides a smooth transition between the internal cross-sections thereof. The exemplary segment  86  has a length L 4 . An exemplary half angle of divergence of the interior surface of segment  86  is ≦12°, more narrowly 5-10°.  
      A fuel/oxidizer charge may be introduced to the detonation conduit interior in a variety of ways. There may be one or more distinct fuel/oxidizer mixtures. Such mixture(s) may be premixed external to the detonation conduit, or may be mixed at or subsequent to introduction to the conduit.  FIG. 3  shows the segments  84  and  86  configured for distinct introduction of two distinct fuel/oxidizer combinations: a predetonator combination; and a main combination. In the exemplary embodiment, in an upstream portion of the segment  84 , a pair of predetonator fuel injection conduits  90  are coupled to ports  92  in the segment wall which define fuel injection ports. Similarly, a pair of predetonator oxidizer conduits  94  are coupled to oxidizer inlet ports  96 . In the exemplary embodiment, these ports are in the upstream half of the length of the segment  84 . In the exemplary embodiment, each of the fuel injection ports  92  is paired with an associated one of the oxidizer ports  96  at even axial position and at an angle (exemplary 90° shown, although other angles including 180° are possible) to provide opposed jet mixing of fuel and oxidizer. Discussed further below, a purge gas conduit  98  is similarly connected to a purge gas port  100  yet further upstream. An end plate  102  bolted to the upstream flange of the segment  84  seals the upstream end of the combustion conduit and passes through an igniter/initiator  106  (e.g., a spark plug) having an operative end  108  in the interior of the segment  84 .  
      In the exemplary embodiment, the main fuel and oxidizer are introduced to the segment  86 . In the illustrated embodiment, main fuel is carried by a number of main fuel conduits  112  and main oxidizer is carried by a number of main oxidizer conduits  110 , each of which has terminal portions concentrically surrounding an associated one of the fuel conduits  112  so as to mix the main fuel and oxidizer at an associated inlet  114 . In exemplary embodiments, the fuels are hydrocarbons. In particular exemplary embodiments, both fuels are the same, drawn from a single fuel source but mixed with distinct oxidizers: essentially pure oxygen for the predetonator mixture; and air for the main mixture. Exemplary fuels useful in such a situation are propane, MAPP gas, or mixtures thereof. Other fuels are possible, including ethylene and liquid fuels (e.g., diesel, kerosene, and jet aviation fuels). The oxidizers can include mixtures such as air/oxygen mixtures of appropriate ratios to achieve desired main and/or predetonator charge chemistries. Further, monopropellant fuels having molecularly combined fuel and oxidizer components may be options.  
      In operation, at the beginning of a use cycle, the combustion conduit is initially empty except for the presence of air (or other purge gas). The predetonator fuel and oxidizer are then introduced through the associated ports filling the segment  84  and extending partially into the segment  86  (e.g., to near the midpoint) and advantageously just beyond the main fuel/oxidizer ports. The predetonator fuel and oxidizer flows are then shut off. An exemplary volume filled the predetonator fuel and oxidizer is 1-40%, more narrowly 1-20%, of the combustion conduit volume. The main fuel and oxidizer are then introduced, to substantially fill some fraction (e.g., 20-100%) of the remaining volume of the combustor conduit. The main fuel and oxidizer flows are then shut off. The prior introduction of predetonator fuel and oxidizer past the main fuel/oxidizer ports largely eliminates the risk of the formation of an air or other non-combustible slug between the predetonator and main charges. Such a slug could prevent migration of the combustion front between the two charges.  
      With the charges introduced, the spark box is triggered to provide a spark discharge of the initiator igniting the predetonator charge. The predetonator charge being selected for very fast combustion chemistry, the initial deflagration quickly transitions to a detonation within the segment  84  and producing a detonation wave. Once such a detonation wave occurs, it is effective to pass through the main charge which might, otherwise, have sufficiently slow chemistry to not detonate within the conduit of its own accord. The wave passes longitudinally downstream and emerges from the downstream end  30  as a shock wave within the furnace interior, impinging upon the surfaces to be cleaned and thermally and mechanically shocking to typically at least loosen the contamination. The wave will be followed by the expulsion of pressurized combustion products from the detonation conduit, the expelled products emerging as a jet from the downstream end  30  and further completing the cleaning process (e.g., removing the loosened material). After or overlapping such venting of combustion products, a purge gas (e.g., air from the same source providing the main oxidizer and/or nitrogen) is introduced through the purge port  100  to drive the final combustion products out and leave the detonation conduit filled with purge gas ready to repeat the cycle (either immediately or at a subsequent regular interval or at a subsequent irregular interval (which may be manually or automatically determined by the control and monitoring system)). Optionally, a baseline flow of the purge gas may be maintained between charge/discharge cycles so as to prevent gas and particulate from the furnace interior from infiltrating upstream and to assist in cooling of the detonation conduit.  
      In various implementations, internal surface enhancements may substantially increase internal surface area beyond that provided by the nominally cylindrical and frustoconical segment interior surfaces. The enhancement may be effective to assist in the deflagration-to-detonation transition or in the maintenance of the detonation wave.  FIG. 4  shows internal surface enhancements applied to the interior of one of the main segments  60 . The exemplary enhancement is nominally a Chin spiral, although other enhancements such as Shchelkin spirals and Smirnov cavities may be utilized. The spiral is formed by a helical member  120 . The exemplary member  120  is formed as a circular-sectioned metallic element (e.g., stainless steel wire) of approximately 8-20 mm in sectional diameter. Other sections may alternatively be used. The exemplary member  120  is held spaced-apart from the segment interior surface by a plurality of longitudinal elements  122 . The exemplary longitudinal elements are rods of similar section and material to the member  120  and welded thereto and to the interior surface of the associated segment  60 . Such enhancements may also be utilized to provide predetonation in lieu of or in addition to the foregoing techniques involving different charges and different combustor cross-sections.  
      The apparatus may be used in a wide variety of applications. By way of example, just within a typical coal-fired furnace, the apparatus may be applied to: the pendants or secondary superheaters, the convective pass (primary superheaters and the economizer bundles); air preheaters; selective catalyst removers (SCR) scrubbers; the baghouse or electrostatic precipitator; economizer hoppers; ash or other heat/accumulations whether on heat transfer surfaces or elsewhere, and the like. Similar possibilities exist within other applications including oil-fired furnaces, black liquor recovery boilers, biomass boilers, waste reclamation burners (trash burners), and the like.  
       FIG. 6  shows further details of the exemplary trolley  72  and track system  74 . The exemplary track system comprises a pair of parallel vertex-up right angle channel elements  140  (e.g., of steel) secured such as by welding to mounting plates  142 . The mounting plates are, in turn, secured to the floor  76  such as via bolts (not shown) in bolt holes  144 . The exemplary trolley includes a structural frame  150  having a pair of left and right longitudinal members  152  and fore and aft crossmembers  154 . At the left and right sides of each crossmember, a wheel  156  is mounted on a depending bracket  158 . The wheel periphery has a concavity (e.g., a right-angle V-groove  160 ) receiving the vertex of the right angle channel elements  140 . The exemplary trolley has means for supporting the associated conduit segment and means for securing the segment in place. The exemplary support means include a pair of fore and aft tube/pipe clamps  170  each positioned and supported by nuts  172  on associated left and right threaded shafts  174  secured at their lower ends to the frame. The clamps  170  have a concave surface  176  complementary to the exterior body surface of the associated conduit segment to support the segment from below. The securing means comprises similar top brackets  180  also mounted to the shafts  174  and held downward in place in compressive engagement with the segment via nuts  182 .  
      A number of options are available for using the trolleys. The individual segments may be preassembled to their associated trolleys and rolled into place along the track system, whereupon the segments may be secured to each other via their end flanges. Disassembly may be by a reverse of this process. The trolleys may also allow the combustion conduit to be moved as a unit (e.g., if it is desired that the downstream portion of the conduit not be inserted into the furnace all the time). Additionally, as noted above, the trolleys may accommodate movement as a unit associated with longitudinal thermal expansion and/or with recoil during discharge cycles while maintaining conduit segment alignment.  
       FIG. 7  shows an alternate system  200  wherein the combustion conduit  202  is suspended from brackets  204  (e.g., as part of a free-standing support structure or secured to a ceiling or roof  206  of the facility). Such a system may be particularly useful where the conduit is positioned high above a facility floor. The exemplary system  200  navigates the conduit  202  around environmental obstacles external to the furnace. Exemplary obstacles include upper and lower tube bundles  210  and  212  between which the conduit passes. In the exemplary embodiment, the conduit is circuitous to permit positioning of its outlet  214  in a position on the furnace wall aligned with one of the two bundles. In such a situation, a straight conduit would be interfered with by the bundles. Accordingly, the conduit is provided with one or more curved sections  216  to accommodate the bundles.  
      From upstream to downstream, the exemplary support system includes an upstream and an intermediate spring hanger  220  and  222  coupled to associated conduit segments by tumbuckle systems  224  and  226 . Exemplary spring hangers are available from LISEGA, Inc., Newport, Tenn. In the exemplary embodiment, the spring hanger  222  may have substantially higher capacity due to a higher static load at that location. The particular combination of hanger sizings may be influenced by the relative locations of the hangers along the conduit in view of mass parameters of the conduit (e.g., center of gravity, mass distribution, and the like), strength parameters of the conduit (e.g., various modulus), and the location of any additional support. The exemplary spring hangers serve as essentially constant-load hangers, with supportive tensile force essentially constant over an operating range. One function of the vertical compliance afforded by the hangers is to accommodate thermally-associated changes in the vertical position of the outlet  214  relative to the ceiling surface  206  or other combustion conduit support structure. For example, thermal expansion of the furnace wall may cause a change in outlet vertical position between hot and cold (e.g., running and off) furnace conditions. In the embodiment of  FIG. 2 , such expansion is addressed by non rigid vertical coupling of the conduit and wall with sufficient vertical play for the conduit within the oversized wall aperture. With rigid mounting, however, if furnace heating raises the conduit outlet height, in the absence of the constant force hangers, a greater fraction of the conduit mass would be carried by the furnace wall and a lesser fraction by the upstream supports. This would be associated with shear/bending forces/moments and associated deformations. The spring hangers, however, will tend to contract, raising the segment(s) to which they are attached to so that the mass supported by the furnace wall does not substantially increase and thus to at least partially, and advantageously in major part, relieve/prevent stresses that otherwise would be associated with the outlet elevation increase the hangers may, therefore maintain an essentially constant orientation of the conduit (e.g., maintaining its upstream major portion in an essentially horizontal orientation).  
      In the exemplary embodiment, a support structure  240  external to the combustion conduit further reinforces the associated assembled segments. Such reinforcement advantageously handles structural stresses associated with shock reflections occurring within the curved segments. In the illustrated embodiment, the structure further rigidly ties downstream portions of the conduit to the furnace wall. In the exemplary embodiment, the turnbuckle  226  is connected via its lower threaded rod to a fixture  242  secured to the upstream end of the support structure and having snubbers  244  to accommodate and dampen side-to-side motion of the conduit which may arise from the combustion process. In the exemplary embodiment, the rigid connection of the support structure to the furnace wall absorbs the recoil forces, essentially preventing recoil. To the extent that longitudinal thermal expansion of the conduit remains an issue, such expansion may be taken up by allowing the hangers to pivot (e.g., relative to connection locations  246  to the brackets  204  above and the connection point  248  with the associated conduit engagement fixture below. Alternative embodiments may remove the rigid coupling of the conduit to the wall and permit a resilient or damped coupling.  
      The support structure  240  is directly mated to several of the doubly flanged conduit segments and connects such segments to the wall  215  via a discharge valve assembly  250  and exemplary preexisting horizontal structural furnace I-beams  252  and  254  above and below the valve assembly  250 . In the exemplary implementation, extension beams  256  and  258  are welded to outboard flanges of the respective beams  252  and  254 . Exemplary beams  256  and  258  are T-beams, although I-beams may also be used. In the exemplary embodiment, there are pairs of left and right beams  256  and left and right beams  258  with respective pairs spanned by left and right vertically-extending I-beams  260  each having an inboard flange secured to the head flange of the associated beams  256  and  258 .  
      Downstream, the combustion conduit includes a nozzle portion  268  extending through an access conduit  270  and access valve  272  of the assembly  250 . The access conduit  270 , the access valve  272 , and wall mounting plate (not shown) provide an access assembly. The access valve  272  has a body with a downstream face mounted to an upstream flange of the conduit  270 . The nozzle  268  is secured to and extends downstream from the body of a second valve or conduit valve  274  ( FIG. 8 ). That body has a downstream face mounted to the upstream face of the body of the access valve  272 . The valves  272  and  274  have respective slider or gate elements  276  and  278  which may be translated between open and closed positions. Continuing upstream, a downstream 45° curved elbow  280  has a downstream flange mounted to the upstream face of the body of the conduit valve  274  and an upstream flange mounted to a downstream flange of a straight conduit segment  282 . The upstream flange of the segment  282  is mounted to the downstream flange of a second 45° elbow  284 . The upstream flange of the elbow  284  is secured to the downstream flange of a downstreammost segment  286  of a major upstream straight portion of the combustion conduit. The exemplary mounting sandwiches a brace interface plate  288  between these two flanges. The upstream flange of the segment  286  is mounted to the downstream flange of a penultimate segment  290  of the straight portion with further segments similarly mounted in series thereahead.  
      The exemplary support structure  240  includes a pair of left and right diagonally-extending downstream braces  300  having downstream ends connected by mounting brackets  302  to the upstream face of the body of the valve  274  and downstream ends connected by mounting brackets  304  to the downstream face of the plate  288 . Positioned end-to-end with the braces  300  are left and right longitudinal braces  306  having downstream ends connected via brackets  308  to the upstream face of the plate  288 . The exemplary braces are U-sectioned with inboard vertical webs and transverse flanges. Just inboard of upstream and downstream flanges of the segments  286  and  290 , the braces  306  are secured to each other by split clamps  310  which compressively engage the adjacent conduit segment bodies. In the exemplary embodiment, an additional structural rib  312  is welded to each brace  306  along the downstream half thereof, aligned with and extending upward from the web thereof above the upper flange thereof.  
      The braces help rigidify and strengthen the assembled segments  280 ,  282 ,  284 ,  286 , and  290 . These braced segments may be vertically supported and restrained against horizontal movement. In the illustrated embodiment, the hanger  222  ( FIG. 7 ) is just upstream of the upstream end of the braces  306 . An additional hanger is provided by a downstream turnbuckle  320  near the downstream end of the braces  300 . In the exemplary embodiment, the turnbuckle  320  has an upper threaded rod connected to a pivot  322  welded to the underside of the flange of the beam  252  and a lower threaded rod connected to a pivot  324  on a clamp on the body of the segment  280  near the downstream end thereof. On each of the left and right sides of the conduit, first and second horizontal tumbuckles  328  and  330  essentially respectively restrain the braced segments against downstream and upstream movement. In the exemplary embodiment, the first tumbuckles  328  span between a downstream end portion of the associated brace  300  and the vertical beam  260  upstream thereof and the second tumbuckles  330  span between the plate  288  and the beam  260  downstream thereof. In the exemplary embodiment, the assembly  250  is rigidly positioned relative to the wall  215 . In such a situation, little compliance is needed near the downstream end of the conduit and thus the exemplary turnbuckle  320  is not associated with a spring hanger. Similarly, a lack of compliance is associated with the tumbuckles  328  and  330 . In alternate embodiments, however, the discharge/outlet end of the conduit may not be rigidly positioned (e.g., may have a degree of float relative to an aperture in the wall). In such a situation, more compliant vertical and horizontal mounting may be provided, the latter optionally including resilient recoil absorbing means.  
      In an exemplary installation sequence, the second valve is installed to the access valve as is described in copending application docket EH-10965 (03-435), filed on even date herewith, the disclosure of which is incorporated by reference in its entirety herein as if set forth at length. The downstream elbow  280  may then be secured to the upstream face of the body of the conduit valve  274 . The turnbuckle  320  may be installed. The straight segment  282  may be installed to the downstream elbow  280  and the upstream elbow  284  installed to the straight segment  282 . The interface plate  288  may be installed to the upstream flange of the elbow  284 . The mounting brackets  302  and  304  and associated downstream braces  300  may then be installed followed by the turnbuckles  328  and  330 . The downstreammost two segments  286  and  290  of the main straight conduit section may sequentially be assembled and the associated clamps  310  installed thereto. The braces  306  may be installed to the clamps and to the brackets  308 , in turn, installed to the interface plate  288 . Alternatively, these segments, clamps, braces and brackets may be assembled as a unit and then installed as a unit to the adapter plate  288  and elbow  284 . The downstream hanger assembly  222  may be installed along with the fixture  242  and snubbers  244 . The remaining upstream full diameter conduit segments may be installed along with the upstream hanger assembly  220 . The predetonator and transition conduits may then be installed followed by gas lines, controls, instrumentation, and the like.  
       FIG. 9  shows a combustion conduit  350  extending from an upstream end  351  to a downstream end/outlet  352 . The exemplary conduit  350  is configured for use in a situation wherein proximity between an obstacle such as a building wall  354  and the furnace wall  356  at the aperture  358  is too small to permit a completely straight combustion conduit of a desired length. The exemplary combustion conduit  350  has a single right angle bend formed by a doubly flanged 90° conduit elbow segment  360 . The general configuration of the combustion conduit  350  may be similar to the foregoing combustion conduits (e.g., those of  FIG. 1 ). The conduit is assembled by bolting conduit segments end-to-end. From upstream to downstream exemplary segments include a small diameter predetonator segment  362 , a transition segment  363  having a diameter transition from the small diameter of the predetonator segment to a larger downstream diameter of remaining segments, four full diameter segments  364 , the elbow  360 , and the singly-flanged nozzle  366 .  
      Yet more complex situations may be accommodated by different segment combinations.  FIGS. 10 and 11  show an exemplary conduit  380  which has both a change in height to accommodate an obstacle such as the tube pack of  FIGS. 7 and 8  and a bend to accommodate a wall or other obstacle  382 . The conduit  380  extends from an upstream end  383  to a downstream end/outlet  384  at the aperture in the furnace wall  386 . From upstream to downstream, the conduit includes a small diameter predetonator segment  388 , a transition segment  390 , a first full diameter straight segment  400 , a 90° elbow  402 , a second full diameter straight segment  404 , a first 45° elbow  406 , a third full diameter straight segment  408 , a second 45° elbow  410 , and a singly-flanged nozzle  412 . The segments may be similarly formed to corresponding segments of the foregoing conduits.  
       FIG. 12  shows representative conduit segments from a kit. The exemplary kit includes a small diameter doubly flanged predetonator segment  430 . The upstream flange of this segment may have an end plate  432  accommodating the igniter and/or inlets for one or more of the fuel and/or oxidizer components. The kit may further include a doubly-flanged transition segment  434 . The kit may further include doubly flanged full diameter conduit segments of a variety of different lengths (four different length segments  436 ,  438 ,  440 , and  442  being shown). There may be multiple instances of any to all of these length segments.  FIG. 12  further shows exemplary doubly-flanged full diameter 45° and 90° elbow segments  444  and  446 . Again there may be multiple of each elbow segment. There may, also, be elbow segments of different angular span. There may be outlet/nozzle conduits of different lengths (relatively short and long lengths  448  and  450  being shown). The different lengths of outlet conduit may accommodate one or both of different vessel wall thickness and general length from the penultimate segment (last doubly flanged segment) to the outlet. This latter factor may alternatively be addressed by the use of a different penultimate segment or segment combination with a single length of outlet conduit.  
      In various implementations, it may be appropriate or necessary to have additional changes in conduit cross-section. For example, between the predetonator and the downstreammost lengths, there may be one or more segments of intermediate cross-section along with appropriate transition segments. In a particular example, there may be insufficient space to route one or more full diameter segments between obstacles at an intermediate position along the length of the conduit. Alternatively, navigating such obstacles may be associated with a change in the cross-sectional shape with general preservation of cross-sectional area. For example, a circular section could transition to an elongate rectangular section of similar area to get between relatively close obstacles. In such a situation, the transition segments could transition in cross-sectional shape. Among yet further variations are those in which one or more of the segments are entirely within the vessel (including segments which may navigate internal obstacles in similar fashion to the aforementioned navigation of external obstacles).  
      The exemplary kit may contain only the segments needed for a particular combustion conduit or group of combustion conduits at a facility. Such conduits may be engineered in advance and the appropriate combinations chosen to achieve desired conduit length in view of the obstacles and other constraints. The other constraints may include the location of entry of the conduit to the furnace, the angle of entry at that location, and the desired location of the upstream end of the conduit. For example, it may be desirable to relatively closely locate the upstream ends of several conduits for control economy. Alternatively, however, a certain amount of the engineering may be performed on-site. In such a situation, the kit could include extra components of various sizes to permit the on-site selection of configuration options and permit experimental on-site optimization.  
      Additionally, the kits may include other aforementioned components such as bolts for securing the segments together, braces, hangers, trolleys and associated hardware, reaction straps/springs, fuel/oxidizer/purge gas equipment and plumbing, control and monitoring hardware, gaskets, and the like. Additionally, the kit might include thermal isolation flanges, air curtain flanges, and cooled nozzle components as disclosed in copending application dockets EH-10962 (03-432), EH-10963 (03-433), and EH-10964 (03-434), filed on even date herewith, the disclosures of which are incorporated by reference in their entireties herein as if set forth at length. Furthermore, the kit may include access apparatus as disclosed in copending application docket EH-10965 (03-435).  
      One or more embodiments of the present invention have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention. For example, the invention may be adapted for use with a variety of industrial equipment and with variety of soot blower technologies. Aspects of the existing equipment and technologies may influence aspects of any particular implementation. Accordingly, other embodiments are within the scope of the following claims.