Improvements in Steam Boilers.
Year: 1890

page_text: Date of Application, 6th Aug., 1890
Complete Specification Left, 6th. May, 1891-Accepted, 6th June, 1891
PROVISIONAL DI PITIVATION
Improvements in Steam Boilers.
I, WILLIAM REGINALD CHESTER, Civil Engineer, of The Woodlands,
Mapperley Hill, Nottingham, in the County of Nottingham, do hereby declare
the nature of this invention to be as follows:
My improvements in steam boilers relate more especially to water-tube steam
boilers placed in and over a vertical flue, and this invention has for its objects
amongst others the utilization of heat contained in waste gases produced from
the combustion of coal coke and other combustible matter on their way to the
chimney.
The temperature of gases escaping from retort furnaces both direct fired and
with regeneration is generally much higher than is needful to ensure the necessary
draught in the chimney and it is proposed to utilize a certain portion of this
heat for the purposes of raising steam without injury to the primary process of
carbonization.
My improvements consist in constructing a water-tube steam boiler with a
vertical or horizontal or inclined drum to contain water and steam, having long
circulating bend tubes, attached to the bottom plates, which hang in the current of
heated gases. The bend tubes have a short and a long leg to assist circulation, the
short leg terminating just above the bottom plate of the drum or cylinder and the
longer leg nearer the water level of the boiler.
In some cases I prefer to carry the tubes right thro. the flue and terminate them
in another vessel which may be used as a mud-drum for collecting and blowing off
sediment and liquid and forming part of the boiler: In this case the tubes are not
bent and do not return direct to the boiler but are straight.
The number of tubes and the size of cylinder or drum must be determined
according to the flue area and the amount of heat that may be abstracted from the
gases before they reach the chimney.
The cylinder of my boiler is placed outside or partly outside the flues and is
constructed to receive the usual boiler fittings such as water gauges, try cocks,
safety valves, blow-off cocks etc., and arranged with a nozzle or mounting near or
upon the crown of the cylinder to take off the supyly of steam generated.
The tubes may be fixed with lock-nuts or expanded in the tube plates and inner
circulating tubes may be used known as "Field circulating tubes "in the short or
long legs of my tubes.
The steam generated may be used for feeding retort furnaces, driving engines or
any purpose for which steam is or may be used.
This type of boiler is also suitable for placing in the flues from smelting furnaces.
puddling furnaces, refuse furnaces, retort furnaces, generator furnaces, destructors
and any such like furnaces as may have large quantities of heated gases passing
away to the chimney.
Dated this 5th day of August 1890.

page_text: COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
I WILLIAM REGINALD CHESTER Civil Engineer of The Woodlands
Mapperley Hill Nottingham in the County of Nottingham do hereby declare
the nature of this invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:-
My improvements in steam boilers relate more especially to water-tube steam
boilers placed in and over a vertical flue and this invention has for its objects
amongst others the utilization of heat contained in waste gases produced from
the combustion of coal coke and other combustible products on their way to the
chimney.
The temperature of gases escaping from retort furnaces both direct fired and
with regeneration is generally much higher than is needful to ensure the necessary
draught in the chimney and it is proposed to utilize a certain portion of this heat
for the purposes of raising steam without hindrance to primary process of
carbonization.
My invention consists in constructing a water-tube steam boiler with a vertical
or horizontal or inclined drum to contain water and steam, having long circu-
lating bend tubes attached to the bottom plates which hang in the midst of the
current of heated gases. The bend tubes have a short and a long leg to assist
circulation, the short leg terminating just above the bottom plate of the drum
or cylinder and the longer leg nearer the water level of the boiler.
In some cases I prefer to carry the tubes right through the flue and terminate
them in another vessel which may be used as a mud-drum for collecting and
blowing off sludge and liquid, and forming part of the boiler. In this case the
tubes are not bent and do not return direct to the boiler but are straight.
The number of tubes and the size of the cylinder must be determined according
to the flue area and the amount of heat that may be abstracted from the gases
before reaching the chimney.
The cylinder of my boiler is placed outside or partly outside the flues and
is constructed to receive the usual boiler fittings such as water gauges, try-
cocks, safety valves, blow off cocks etc. and arranged with a nozzle or mounting
near or upon the crown of the cylinder to take off the supply of steam generated.
The tubes may be fixed with lock nuts or expanded and bedded in the tube plates
and inner circulating tubes may be used known as "Fields" circulating tubes in
the short or long leg of my tubes.
The steam generated may be used for feeding the retort furnaces, driving engines
or any purpose for which steam is or may be employed.
This type of boiler is also suitable for placing in the flues from smelting furnaces,
puddling furnaces, refuse furnaces, destructors, retort furnaces, generator furnaces
and any such like furnaces as may have large quantities of heated gases passing
away to the chimney.
In the accompanying sheets of illustrative drawings
Figure 1 represents an elevation partly in section shewing the boiler arranged
suitable for carrying my invention into practical effect.
Figure 2. is a sectional plan through the water space of boiler and flue on
line A. B.
Figure 3 represents an elevation partly in section with mud box attached.
The same letters of reference indicate the same parts of the apparatus in all
figures.
for
In these drawings
A is the steam outlet for supplying steam to feed pump.
B steam outlet for supplying steam to the ashpits of regenerator furnaces or
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page_text: as they supply steam generated by action, of heat from the gases which are the
products of combustion escaping from retorts settings and regenerators.
"C" represents a dead weight safety valve.
D lugs for lifting the boiler so that the boiler may be lifted out of the flue and
seating for repairs without disturbing the brickwork."
E represents the boiler manhole.
F is the damper-when bypass flues are arranged the boiler may be shut off and
in some cases where a number of these boilers are in use any one of them may be
worked or kept standing.
Gis the water gauge to show the height of water in the boiler.
H represents the long leg of the tubes in Figure 1 and is arranged of sufficient
height to cause circulation of the water, the more highly heated water flowing over
the top of the long leg into the water space of the boiler.
I is the blow-off' cock.
represents the short leg of bend tubes in Figure 1 to allow the less heated
water to pass down the tubes into the vertical flues so that it may become heated
and cause circulation.
K represents the tube plate showing the tube secured by lock nuts, these tubes
may be fixed by expanding in bored holes or by other well known means of securing
tubes in tube plates.
Lis the hole for water feed.
M the flue leading to the chimney where the products of combustion after
pass
acting upon the heating surface of boiler.
N is the vertical flue arranged so that full benefit may be taken of the products
of combustion.
In some cases it may be necessary to pass the tubes through a horizontal flue
which however will not affect the construction of the boiler.
O is the horizontal flue leading from the furnace.
The arrangement of flues and setting of boiler may be varied according to the
arrangements of existing brickwork leading the gases from furnaces but the
construction of boiler and its attachments will remain as shown.
When the feed water contains solid matter in the form of mud or dirt the lower
end of tubes may terminate in a mud-box as illustrated in Figure III represented
at P with outlet Q.
When the boiler is in use the products of combustion from the flue O in the
direction indicated by the arrows, thro. the vertical flue N when the water in the
boiler is heated and steam generated and on to the flue M towards the chimney
shaft.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is.
1. The combination and arrangement of steam boilers for the purposes herein-
before described and illustrated on the drawings.
2. The improved construction of steam boilers as shown and described.
3. The recovery and utilization of the waste heat escaping from retort settings
and other furnaces substantially as hereinbefore described.
Dated this 4th day of May 1891.
WILLIAM REGINALD CHESTER.