Abstract:
The present invention uses an internal combustion engine operated at an air/fuel ratio richer than stoichiometric as a partial oxidation reformer in fuel cell power generation systems. Commonly available liquid or gaseous hydrocarbon or alcohol fuels, including “logistic” fuel in military applications, are converted to a product gas mixture containing hydrogen, carbon monoxide, and traces of light hydrocarbons. The product gas may be used directly or with minimum processing by high temperature fuel cells, or processed further for use in low temperature fuel cells. Advantages include high efficiency, adaptability to a variety of fuels, and quick system startup with immediate shaft power availability.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
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     STATEMENT REGARDING FEDERALLY SPONSORED RESERCH OR DEVELOPMENT 
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     REFERENCE TO A MICROFICHE APPENDIX 
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     BACKGROUND OF THE INVENTION 
     The proposed concept is related to conversion of liquid and gaseous hydrocarbon and alcohol fuels to product gas containing hydrogen, carbon monoxide, and traces of hydrocarbons that is useable in fuel cells. In particular, it relates to the unique capability of internal combustion engines (ICEs) operated with fuel in excess of the stoichiometric quantity to carry out this fuel conversion process. 
     The background of the invention includes processes and systems for supplying fuel to fuel cells, the use of internal combustion engines as chemical reactors, and power plants combining these elements. 
     Fuel cells are electrochemical systems that generate electrical current by chemically reacting a fuel gas and an oxidant gas on the surface of electrodes. Conventionally, the oxidant gas is oxygen or air, and the fuel gas is hydrogen or a mixture of hydrogen, carbon monoxide, and traces of hydrocarbons. The fuel gas may also contain non-fuel gases including nitrogen, water vapor and carbon dioxide. The specific fuel gas composition requirements depend on the type of fuel cell. Low temperature fuel cells, exemplified by proton exchange membrane (PEM) cells and alkaline fuel cells (AFC), can only utilize hydrogen as fuel, and contain precious metal catalysts that are poisoned by carbon monoxide. High temperature fuel cells, exemplified by solid oxide fuel cells (SOFC) and molten carbonate fuel cells (MCFC), do not contain precious metal catalysts, and utilize hydrogen, carbon monoxide, and traces of hydrocarbons as fuel. Most fuel cell types are adversely affected by sulfur compounds. 
     Pure hydrogen is the ideal fuel for all fuel cell types, but it is not widely available. Further, storage and transportation involves large, heavy and costly means such as compressed gas bottles. Practical fuel cell generators must therefore utilize commonly available and easily transported fuels including natural gas, liquefied petroleum gas (LPG), methanol, ethanol, gasoline and diesel fuel, and logistic fuel. These hydrocarbons and alcohols must be reformed to fuel gas suitable for the particular fuel cell application. In addition, these fuels often contain sulfur that must be removed. Conventional processes for desulfurizing and reforming liquid and gaseous fuels are well known in the art, and will only be summarized. 
     Fuel reforming is based on the endothermic reaction of hydrocarbon or alcohol fuel with steam and/or CO 2 , to form CO and H 2 . This can be done in two ways. The first is steam reforming. Steam reformers use high temperature catalyst filled tubes heated by burners fueled by fuel cell exhaust fuel and air streams. Steam is supplied by a waste heat boiler. Heat transferred across the tube wall drives the endothermic reaction. Such systems provide the highest hydrogen yield, but tend to be large, complex, and slow to start up and respond to load changes. Further, they require sulfur removal from the feedstock to avoid catalyst poisoning. The second is partial oxidation (POX) reforming. POX reformers and catalytic autothermal reformers eliminate high temperature heat exchangers by reacting a rich mixture of fuel and air to provide the reforming heat within the gas stream. Steam is added to the hot hydrogen and carbon monoxide to cool the stream and increase hydrogen yield. Non-catalytic POX reformers operate at temperatures around 1000° C. for gasoline and up to 1400° C. for heavy hydrocarbons, necessitating special heat-resistant materials. Autothermal reformers use a catalyst to operate at temperatures under 1000° C., and may be less costly. These systems are smaller, simpler and faster responding than steam reformers, and are preferred for applications such as vehicle propulsion. Even so, there is a delay before power is available in a cold start and the feedstock must be low in sulfur. 
     Generally heavier liquid hydrocarbons such as diesel fuel are the most difficult to reform, and have the greatest tendency to form soot rather than the desired product gas. Further, they are more likely to contain large amounts of sulfur. “Logistic” fuel is an extreme case. It is a low-grade, high sulfur diesel fuel that may be the only fuel available to the military in the field. While reciprocating and turbine ICEs operate directly on logistic fuel, fuel cell power plants require extensive fuel processing capability, resulting in additional size and weight. 
     The method of sulfur removal depends on both the reforming system and the type of fuel. If the reforming reaction uses a catalyst, then the sulfur is typically removed from the feedstock prior to reforming. Hydrodesulfurization is the classic means used for liquid hydrocarbons. Hydrogen separated from the product gas stream is reacted with the fuel over the catalyst to convert the sulfur compounds to hydrogen sulfide. The hydrogen sulfide is then removed by passing the stream through a zinc oxide bed. Activated charcoal filtration is sufficient to remove sulfur from natural gas before reforming. Non-catalytic POX reformers tolerate sulfur in the fuel, and convert it to hydrogen sulfide that can be removed from the product gas with a zinc oxide bed. 
     Since low temperature fuel cells can only utilize hydrogen and do not tolerate over 50 ppm CO, shift conversion and selective oxidation stages must be added to increase hydrogen and decrease CO levels. The situation is simpler for high temperature fuel cells. At 600° C. to 1000° C., CO and moderate quantities of hydrocarbons are reformed at the nickel anode surface using the steam, CO 2  and heat from the power generation reaction. The reforming process only needs to break down the heavy hydrocarbons into a mix of gasses that the SOFC can utilize directly or reform internally without soot formation. High-temperature fuel cell systems can therefore use the product gas from steam, autothermal and POX reformers directly. 
     Startup characteristics are often important in fuel cell power plants operating on hydrocarbon and alcohol. A certain amount of time is needed to start a reformer to generate hydrogen, and high temperature fuel cells require time to heat to operating temperature regardless of the availability of fuel. This delay necessitates an interim power source such as a battery or ICE for applications that require immediate response, such as vehicle propulsion or emergency power. 
     ICEs include turbine, reciprocating piston or other machines that compress air, heat the air by reacting fuel with the oxygen in the air, and expand the heated air to produce work. The theoretical amount of fuel required to consume the oxygen in the air is termed the stoichiometric quantity. Typically, the amount of fuel added is less than the stoichiometric quantity (a lean mixture), since this makes the most efficient and economical use of the fuel. Fuel in excess of the available oxygen (a rich mixture) is discharged in the exhaust and produces no useful work. The composition of excess hydrocarbon fuel, however, is changed by the combustion process. Rich mixture exhaust contains hydrogen, carbon monoxide, and small amounts of hydrocarbons in addition to nitrogen and water vapor. Oxides of nitrogen (NOX), typical pollutants produced by lean mixtures, are suppressed by the reducing environment created by the rich mixture. In addition, sulfur compounds are converted to hydrogen sulfide. The overall result of rich ICE operation with hydrocarbon fuel is shaft work and almost complete conversion of the excess fuel into product gas containing hydrogen and CO. One of the specific problems with a rich running ICE is the production of soot. The theoretical rich soot formation limit for fuel with a stoichiometric ratio of 14.65 is 5.5, but in a real piston ICE soot formation occurs at higher ratios. 
     Use of an air/fuel mixture richer than stoichiometric in an ICE is a known technique to produce combustible gas. U.S. Pat. No. 4,041,910 by Houseman, assigned to NASA, describes a multicylinder engine in which the exhaust from two rich-running cylinders is used to fuel six lean-running cylinders. This avoids the oxide of nitrogen formation peak near stoichiometric operation, while providing complete fuel combustion. Houseman states that soot-free operation as low as 6.5 can achieved by adding water or steam, recycling the water-containing exhaust from the lean-running cylinders, or vaporizing and thoroughly mixing the fuel with heated air. U.S. Pat. No. 5,339,634 by Gale et. al., assigned to Southwest Research Institute, shows a similar system. In Gale et. al. a shift conversion catalyst is used to increase the hydrogen content of the rich-running cylinder exhaust. This exhaust is then mixed with additional fuel and air and fed to the lean-running cylinders where the hydrogen extends the lean limit. Neither of these patents contemplates using the rich exhaust as fuel for fuel cells. 
     U.S. Pat. No. 6,276,473 B1 by Zur Megede shows fuel cells and ICEs combined in an integrated vehicle power plant. It does not, however, utilize the ICE as a fuel processor for the fuel cell. Instead, it uses it as a means of providing immediate vehicle motion, as a heat source to warm the fuel cell to operating temperature, and as a supplemental power source after warm-up. The ICE and fuel cell both use a common hydrogen fuel source. 
     BRIEF SUMMARY OF THE INVENTION 
     The present invention is a means for generating power from hydrocarbon and alcohol fuels in a power plant that integrates an ICE and a fuel cell. The ICE is operated with a rich hydrocarbon or alcohol fuel mixture to produce shaft power and an exhaust stream containing a mixture of gasses including hydrogen, carbon monoxide, and traces of hydrocarbons. The fuel cell then electrochemically oxidizes this product gas at the anode to produce electric power, while reducing oxygen at the cathode. The depleted fuel cell product gas and air exhaust streams may be handled in several ways. The prior art approach is to mix and combust the streams in an afterburner to produce process heat and eliminate exhaust pollutants. This invention includes additional productive uses for the depleted product gas stream. In one, a portion of the depleted product gas stream is recycled and combined with the ICE inlet fuel-air mixture to supply water vapor for soot suppression. In another, the depleted product gas stream is mixed with air to form a lean mixture that is burned in a separate ICE to produce shaft power and serve as an afterburner. The separate ICE may also be a section of the same machine used to process fuel. An example is to use one or more dedicated cylinders in a multi-cylinder reciprocating ICE that also includes fuel processing cylinders as an afterburner. 
     The present invention has a number of objectives. First, it employs the high peak temperatures in the ICE cycle to decompose the hydrocarbons and alcohols and hydrogenate sulfur compounds without catalysts. In particular, difficult feedstock such as “logistic” fuel may be processed. At the same time, oxide of nitrogen formation is strongly suppressed through the reducing effect of excess fuel. Reciprocating ICEs are particularly effective in achieving high peak combustion temperatures (on the order of 2000° C.) while maintaining the engine components at relatively low temperatures compatible with ordinary materials. Second, thermodynamic advantages are gained. The gas expansion work produces shaft power and reduces the gas temperature so that the exhaust temperature is on the order of 700° C. Like electric power, shaft power is thermodynamically the highest grade of energy, and contributes to the overall system efficiency. Third, system operation is enhanced. ICEs start in seconds and, while the system warms up, produces immediate shaft power that may be used for a number of purposes including vehicle propulsion and emergency electric power generation. The hot exhaust serves to heat the balance of the fuel processing system and start the electrochemical power generation process. The ICE may be controlled such that startup operation is near stoichiometric to maximize shaft power output and minimize fuel waste and exhaust pollution while the system is heated, and then shifted to rich operation. In general, the ICE facilitates system control. Rotational speed, throttle position and fuel-air ratio may be varied over a wide range to control the composition and flow rate of product gas. Fourth, the invention utilizes mature, low cost ICE technology that is supported by a ubiquitous manufacturing, service and fuel supply infrastructure. This facilitates earlier widespread fuel cell application with the attendant environmental and energy conservation benefits. 
     In summary, rich-running ICEs are more that simple replacements for conventional reformers in fuel cell systems. The integration of ICEs and fuel cells of the present invention is a novel and synergistic combination that forms a power plant with the energy efficiency and environmental advantages of fuel cells together with the fast response and fuel flexibility of ICEs. 
     Upon examination of the following detailed description the novel features of the present invention will become apparent to those of ordinary skill in the art or can be learned by practice of the present invention. It should be understood that the detailed description of the invention and the specific examples presented, while indicating certain embodiments of the present invention, are provided for illustration purposes only. Various changes and modifications within the spirit and scope of the invention will become apparent to those of ordinary skill in the art upon examination of the following detailed description of the invention and claims that follow. 
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
     The appended claims set forth those novel features that characterize the invention. However, the invention itself, as well as further objects and advantages thereof, will best be understood by reference to the following detailed description of preferred embodiments taken in conjunction with the accompanying drawings, where like reference characters identify like elements throughout the various figures, in which: 
     FIG. 1 is an illustration of a reciprocating ICE serving as a fuel processor for high temperature fuel cells; 
     FIG. 2 is a graph reproduced from E. M. Goodger,  Petroleum and Performance in Internal Combustion Engineering , Butterworth Scientific Publications, London, 1953 that shows the exhaust composition of reciprocating engine exhaust as a function of air/fuel ratio; 
     FIG. 3 is a graph reproduced from Fritz A. F. Schmidt,  The Internal Combustion Engine , Chapman and Hall, London, 1965 that shows the rich and lean combustion limits of pentane, carbon monoxide and hydrogen as a function of mixture temperature; 
     FIG. 4 illustrates a power plant embodying the invention using high-temperature fuel cells and an afterburner to consume depleted product gas; 
     FIG. 5 illustrates a power plant embodying the invention using low-temperature fuel cells and an afterburner to consume depleted product gas; 
     FIG. 6 illustrates a power plant embodying the invention using high-temperature fuel cells and an ICE for utilizing depleted product gas. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention relates to energy conversion systems that combine ICE and fuel cell elements to convert hydrocarbon and alcohol fuels to electric power and shaft power. The present invention is described with respect to a reciprocating four-stroke Otto cycle IEC. However, it will be obvious to those skilled in the art that the following detailed description is similarly applicable to many types of ICEs that may be operated with excess fuel including rotary, Brayton cycle turbine, and two-stroke reciprocating machines. 
     FIG. 1 illustrates the basic invention. A four-stroke engine  1  is combined with a high temperature fuel cell stack  2 . The engine is of generally conventional design, and may be single-cylinder as shown or multi-cylinder. The piston  3  is reciprocated in the cylinder  4  by the connecting rod and crank assembly  5 . The fuel injector  17  adds hydrocarbon or alcohol fuel to the incoming air in the inlet passage  7  forming a rich, homogeneous air/fuel mixture. The inlet valve  8  and the exhaust valve  9  are opened and closed in a timed relationship with the motion of the piston  3  such that air/fuel mixture is drawn in through the inlet passage  7 , compressed, ignited, expanded to produce shaft power, and pushed out into the exhaust passage  10  as product gas. The combustible constituents of the product gas include hydrogen, carbon monoxide, and small amounts of hydrocarbons. A duct  11  delivers the product gas to the fuel cell anode passages  12 , where its combustible constituents are electrochemically oxidized. Air is passed through the cathode passages  13  where its oxygen is electrochemically reduced. The product gas oxidation and oxygen reduction combine to generate electric power that is collected at terminals  14  connected to the cell anodes and cathodes. It should be noted that production of net ICE shaft power is not essential. Operation at idle with no net shaft power output, or operation in which shaft power is supplied to the engine is within the scope of the invention. 
     FIG. 2 shows the dry exhaust gas composition of a four-stroke reciprocating spark ignition ICE operating on liquid hydrocarbon fuel at air/fuel ratios both richer and leaner than stoichiometric. At a rich air/fuel ration of 10:1, for example, the exhaust gas fuel components are about 6.5% hydrogen, 12% carbon monoxide, and a faction of a percent methane. Non-fuel gases include about 7% carbon dioxide and 74% nitrogen. The previous quantities are on a dry basis: wet exhaust gas contains about 15% by volume of water vapor. Oxide of nitrogen content is very low because of the strongly reducing environment in rich, homogeneous combustion. Very rich operation is desirable for several reasons. First, it shifts the energy conversion from the ICE to the fuel cell, which is in many cases more efficient. Second, it increases the fuel concentration in the product gas stream, reducing the flow volume and the size of the flow passages. Finally, it decreases oxide of nitrogen formation. Historically, rich ICE operation has been used with piston engines primarily for cold starting and to generate peak power for motor vehicle acceleration or aircraft takeoff. Normal operation is slightly leaner than stoiciometric for efficiency and low exhaust emissions. The smoke limit, the point at which some excess fuel is converted to soot rather than hydrocarbon monoxide, forms the practical limit to rich operation. In theory, soot formation occurs below an air/fuel ratio of 5.5 for fuel with a stoichiometric ratio of 14.65, but in real ICEs soot formation occurs at higher ratios. According to Houseman, (U.S. Pat. No. 4,041,910) soot-free operation as low as 6.5 can be achieved by a combination of means including addition of water, steam or recycled exhaust to the air/fuel mixture, and vaporizing and thoroughly mixing the fuel with heated air. The data in FIG. 3 supports Houseman&#39;s conclusions. The rich combustion limits for several different fuels are two or more times the stoichiometric fuel quantity, and the limits increase with temperature. 
     A power plant is defined as a system that contains all the elements required to convert fuel and air into electric or mechanical power, and complete power plants using the present invention may require elements in addition to the ICE and fuel cell. Three power plant system variations are shown schematically in FIG.  4 -FIG.6 below. All include sulfur removal, but it should be understood that availability of low-sulfur fuel or use of fuel cells that are sulfur tolerant could eliminate this need. In addition to the major components shown, a number of components including a supervisory control system, sensors, valves, pumps, blowers, thermal insulation, electric power conditioning and control systems, and enclosures may be required to implement the invention and adapt it to particular applications. These are not part of the present invention, and are omitted from the descriptions for clarity. 
     FIG. 4 shows a power plant system containing high temperature fuel cells. ICE inlet air enters duct  15 , and is heated to 250° C. to 350° C. in heat exchanger  16  to assure fuel vaporization. Fuel is added through injector  17  and mixed with the heated air in chamber  18 . Optionally, depleted anode product gas from duct  19  is added to the inlet mixture to increase the water vapor content and suppress soot formation. The inlet mixture is then drawn into the ICE  1  and combusted to produce shaft power and product gas. The shaft power is delivered to a load  20  that may be an electric generator, power plant auxiliaries, vehicle propulsion, or other application. The product gas temperature is about 700° C. as it leaves the ICE, and is cooled to 350° in heat exchanger  21  before passing through zinc oxide bed  22  for hydrogen sulfide removal. Cooling is necessary since higher temperatures will damage the zinc oxide. The desulfurized product gas is reheated in heat exchanger  23  to 500° C. to 800° C. before entering the anode passages of the fuel cells  2  through duct  24 . Fuel cell inlet air enters duct  25 , and is heated to 500° C. to 800° C. in heat exchanger  26  before entering the cathode passages of the fuel cells  2  through duct  27 . A portion, typically 60% to 90%, of the fuel value of the product gas is electrochemically oxidized in the anode passages by the air passing through the cathode passages. Typically 30% of 80% of the oxygen is electrochemically reduced and removed from the air stream. The depleted air stream then enters the afterburner  28  through duct  29 .The product gas exhaust stream is optionally divided into two portions at junction  30 . One portion enters the afterburner  28  where it is mixed with the depleted air stream and combusted. The afterburner exhaust stream, which is largely free of unburned fuel constituents, is cooled in heat exchanger  31  and released to the atmosphere through exhaust duct  32 . The other portion of the product gas exhaust stream leaving junction  30  flows through duct  19  and is mixed with the ICE inlet mixture. The thermal management system  33  consists of multiple heat transfer paths that move heat from heat exchangers  21  and  31  that cool gas streams to heat exchangers  16 ,  23 , and  26  that heat gas streams. 
     FIG. 5 shows a power plant system containing low temperature fuel cells. As in the high temperature system, ICE inlet air enters duct  15 , and is heated to 250° C. to 350° C. in heat exchanger  16 . Fuel is added through injector  17  and mixed in chamber  18  with the heated air. Optionally, afterburner exhaust from duct  19 . is added to the inlet mixture to increase the water vapor content and suppress soot formation. The inlet mixture is then drawn into the ICE  1  and combusted to produce product gas, and shaft power is delivered to load  20 . The product gas is cooled to 350° in heat exchanger  21  and passed through zinc oxide bed  22  for hydrogen sulfide removal. Additional process steps are required to condition the product gas for the low-temperature fuel cells. The high temperature shift converter  34  uses an iron oxide and chromium oxide catalyst to convert a portion of the carbon monoxide to hydrogen and carbon dioxide through a reaction with water vapor in the gas stream. The reaction is exothermic, and the conversion decreases with increasing temperature. For this reason, shift conversion is done in stages with cooling in-between. Heat exchanger  35  is used to cool the gas stream to 200° C. to 250° C. before it enters the low temperature shift converter  36  where a copper oxide and zinc oxide catalyst converts additional carbon monoxide to hydrogen. Heat exchanger  37  cools the stream to 150° C. to 200° C. It is then mixed with a small amount of air entering through duct  38 , and carbon monoxide is selectively oxidized by the platinum catalyst  39 . The product gas stream is cooled in heat exchanger  40  to a temperature compatible with the low temperature fuel cells before it enters the anode passages of the fuel cells  2  through duct  24 . Fuel cell inlet air enters duct  25  and flows into the cathode passages of the fuel cells  2  through duct  26 . A portion, typically 60% to 90%, of the product gas is electrochemically oxidized in the anode passages by the air passing through the cathode passages. Typically 30% of 80% of the oxygen is electrochemically reduced and removed from the air stream. The depleted air and product gas streams enter the afterburner  28  through ducts  29 , and  41  where they mix and combust. The afterburner exhaust stream, which contains carbon dioxide and water vapor and is largely free of unburned fuel constituents, is cooled in heat exchanger  31  and released to the atmosphere through exhaust duct  32 . A portion of the afterburner exhaust stream is optionally diverted at junction  42  into duct  19  to be mixed with the ICE inlet mixture. The thermal management system  33  consists of multiple heat transfer paths that move heat from heat exchangers  21 ,  35 ,  37 ,  40  and  31  that cool gas streams to heat exchanger  16  that heats the inlet air stream. 
     FIG. 6 shows a power plant system containing high temperature fuel cells that uses a second ICE engine to combust the depleted product gas and extract additional work. The system flow up to the fuel cell exit in this example is similar to the high temperature fuel cell example of FIG.  4 . ICE inlet air enters duct  15 , and is heated to 250° C. to 350° C. in heat exchanger  16 , fuel is added through injector  17  and mixed in chamber  18  with the heated air. Optionally, system exhaust from duct  19  is added to the inlet mixture to increase the water vapor content and suppress soot formation. The inlet mixture is then drawn into the first ICE  1  and combusted to produce product gas, and shaft power is delivered to a load  20 . The product gas is cooled to 350° in heat exchanger  21  and passed through zinc oxide bed  22  for hydrogen sulfide removal. The desulfurized product gas is reheated in heat exchanger  23  to 500° C. to 800° C. before entering the anode passages of the fuel cells  2  through duct  24 . Fuel cell inlet air enters duct  25 , and is heated to 500° C. to 800° C. in heat exchanger  26  before entering the cathode passages of the fuel cells  2  through duct  27 . A portion, typically 60% to 90%, of the product gas fuel value is electro-chemically oxidized in the anode passages by the air passing through the cathode passages. Typically 30% of 80% of the oxygen is electrochemically reduced and removed from the air stream. The depleted product gas stream is optionally divided into two portions at junction  30 . Air is added to one portion of the depleted product gas through duct  43  to form a lean air/fuel mixture that enters the second ICE  44 . Lean-burning ICE  44  supplies shaft power to load  45  and acts as an afterburner to consume the remaining fuel in the product gas stream. Exhaust from the second ICE is cooled in heat exchanger  46  and released to the atmosphere through exhaust duct  47 . The depleted cathode air stream passes through duct  29  and heat exchanger  48  and is released to the atmosphere through exhaust duct  49 . The other portion of the product gas exhaust stream leaving junction  30  flows through duct  19  and is mixed with the inlet mixture of ICE  1 . The thermal management system  33  consists of multiple heat transfer paths that move heat from heat exchangers  21 ,  46 , and  48  that cool gas streams to heat exchangers  16 ,  23 , and  26  that heat fluid streams. The ICEs  1  and  44  may be separate machines as shown or dedicated fluid paths through a single machine. An example is a multicylinder reciprocating engine in which one group of cylinders comprises ICE  1  and another group comprises ICE  44 . 
     There are no definite upper or lower limits to the output of power plants incorporating the present invention, and output of less than 100 watts to tens of megawatts is contemplated. 
     The foregoing embodiments of the present invention have been presented for the purposes of illustration and description. These descriptions and embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in the light of the above disclosure. The embodiments were chosen and described in order to best explain the principle of the invention and its practical applications to thereby enable others skilled in the art to best utilize the invention in its various embodiment and with various modifications as are suited to the particular use contemplated. It intended that the invention be defined by the following claims. The term “air” is used in the claims to designate any gas that contains significant amounts of free oxygen, “system fuel” is used to designate any liquid or gaseous hydrocarbon or alcohol before conversion, and “product gas” is used to designate the reformed fuel gas stream.