JP3975191B2 - Combustion device for fuel reformer - Google Patents

Description

  The present invention relates to a combustion apparatus for a fuel reformer.

  In general, a fuel cell is one that combines hydrogen and oxygen in reverse to the electrolysis of water to extract the electricity and heat generated at that time. Because of its high power generation efficiency and environmental compatibility, Although fuel cell cogeneration systems and fuel cell vehicles are being actively developed, the hydrogen used as fuel for such fuel cells is reformed from petroleum-based fuels such as naphtha and kerosene, city gas, etc., with a reformer. Manufactured.

FIG. 6 shows an entire system of a stationary polymer electrolyte fuel cell (PEFC) as an example of equipment provided with a reformer. 1 is a reformer, 2 is a modified A water evaporator that evaporates water by the heat of exhaust gas discharged from the gasifier 1 and generates water vapor, 3 is a raw fuel vaporizer that vaporizes raw fuel such as naphtha by the heat of the exhaust gas, and 4 is a reformer 1 The desulfurizer 5 desulfurizes the feed gas supplied to the reactor 5 and the temperature of the reformed gas reformed by the reformer 1 is lowered to the required temperature (approximately 200 to 250 ° C.) with cooling water to convert CO and H ₂ O into CO. A low-temperature shift converter that converts the gas into ₂ and H ₂ , 6 is a selective oxidation CO remover that cools the reformed gas that has passed through the low-temperature shift converter 5 with cooling water and removes CO by an oxidation reaction, and 7 is a selective oxidation CO removal device 6. The A humidifier 8 for humidifying the reformed gas that has passed through is a solid polymer fuel cell 8 having a cathode 8a and an anode 8b.

  In the facility shown in FIG. 6, water is converted into steam by the water evaporator 2, and raw fuel such as naphtha is vaporized by the raw fuel vaporizer 3 as raw material gas, and the raw material gas mixed with the steam is desulfurized. The raw material gas led to the reformer 4 and desulfurized by the desulfurizer 4 is guided to the reformer 1, and the reformed gas reformed by the reformer 1 is converted into the low temperature shift converter 5 and the selective oxidation CO remover 6. And the humidifier 7 are led to the anode 8b of the polymer electrolyte fuel cell 8, and air is led to the cathode 8a of the polymer electrolyte fuel cell 8 via the humidifier 7 so that power generation is performed. The anode off-gas discharged from the anode 8b is reused as fuel gas in the reformer 1, while the water discharged from the cathode 8a is exchanged with the polymer electrolyte fuel cell 8. Selective oxidation CO remover 6 and low temperature shift Converter 5 is adapted to be used as part of the steam to be mixed to the respective cooling water, and the raw material gas.

  Conventionally, the reformer 1, the water evaporator 2, the raw fuel vaporizer 3, the desulfurizer 4, the low temperature shift converter 5, and the selective oxidation CO remover 6 as the related equipment are one as a fuel reformer. As such a fuel reforming apparatus, for example, a burner combustion type apparatus disclosed in Japanese Patent Application No. 2002-140149 has been proposed.

  Thus, such a fuel reformer is shown in FIGS. 7 and 8, in which the same reference numerals as those shown in FIG. 6 denote the same components. In the fuel reformer shown in FIGS. 7 and 8, the reformer 1 and its related devices (water evaporator 2, raw fuel vaporizer 3, desulfurizer 4, low temperature shift converter 5, and selective oxidation CO remover 6). The unit consisting of the above is covered with a vacuum heat insulation container 9 in which a vacuum heat insulation layer 9c is formed between the inner cylinder 9a and the outer cylinder 9b, thereby constituting a fuel reformer.

  In the case of this illustrated example, the inner cylinder 9a itself of the vacuum heat insulating container 9 is used as a part of the reformer 1, and the combustion gas injected from the combustion device 10 at the center inside the inner cylinder 9a. Is disposed, and a combustion gas flow path 12 is formed between the furnace cylinder 11 and the inner cylinder 9a, and a reforming catalyst (not shown) is formed inside the flow path 12. The reformer 1 is configured by arranging a plurality of (six in the example of FIG. 8) reforming pipes 13 for reforming the material gas. The reforming pipe 13 has a double-pipe structure composed of an inner pipe 13a and an outer pipe 13b, and the source gas is raised in a space formed between the inner pipe 13a and the outer pipe 13b. After exchanging heat with the combustion gas, it is folded at the upper end to lower the space in the inner tube 13a.

  A furnace cylinder 11 of the reformer 1 is connected to an upper end portion of a base inner cylinder 16 erected from a base plate 14, and has a short base outer cylinder 15 rising from an outer peripheral edge of the base plate 14. The lower end portion of the vacuum heat insulating container 9 is hermetically connected to the upper end portion by means of fastening means such as bolts and nuts (not shown), and the base plate 14, the base inner tube 16, the base outer tube 15, In a cylindrical space 17 defined by the inner cylinder 9a of the vacuum heat insulating container 9 and communicating with the combustion gas flow path 12, a water evaporator 2 as a related device of the reformer 1, a raw fuel vaporization A vessel 3, a desulfurizer 4, a low temperature shift converter 5, and a selective oxidation CO remover 6 are arranged.

  An air flow path 18 for supplying air to the combustion device 10 is formed inside the base inner cylinder 16, and a fuel gas such as an anode off gas is supplied to the combustion device 10 at its axial center. A fuel gas supply pipe 19 is provided, and combustion fuel is supplied from the combustion fuel supply pipe 20 to the combustion apparatus 10 at the time of start-up or steady combustion.

  In the fuel reforming apparatus shown in FIGS. 7 and 8, since the heat insulating layer 9c is constructed simply by covering the unit with the vacuum heat insulating container 9, the labor for the heat insulating layer 9c is greatly reduced, and the reforming is performed. At the time of maintenance such as catalyst replacement and inspection in the vessel 1, it is only necessary to open the vacuum heat insulating container 9, and work can be performed quickly.

  Moreover, since the vacuum heat insulation container 9 in which the vacuum heat insulation layer 9c is formed between the inner cylinder 9a and the outer cylinder 9b is adopted as the container, the heat insulation performance is extremely high, and the volume of the heat insulation layer 9c is reduced. While the apparatus can be reduced in size, the amount of heat dissipated can be suppressed, which helps to improve the thermal efficiency.

  Furthermore, since the inside of the inner cylinder 9a of the vacuum heat insulating container 9 is used as the combustion gas flow path 12 of the reformer 1, the structure of the entire apparatus is simplified, leading to cost reduction. Further, the reformer 1 is combusted. A furnace tube 11 through which combustion gas injected from the apparatus 10 circulates, and a combustion gas flow path 12 formed between the furnace tube 11 and the inner tube 9a of the vacuum heat insulating container 9 are arranged in parallel and modified inside. Since the catalyst is loaded with a plurality of reforming tubes 13 for reforming the raw material gas by passing through the raw material gas, it is possible to increase the number of reforming tubes 13 and radiate by high-temperature combustion in the combustion device 10. By utilizing heat transfer, the total length of the reformer 1 can be shortened. Along with this, the water evaporator 2, the raw fuel vaporizer 3, the desulfurizer 4, the low temperature shift converter 5, the selective oxidation CO remover 6, etc. Related equipment can be placed under the reformer 1, and the height of the fuel reformer Can Kusuru.

  During normal operation, the reformer 1 is supplied with the raw material gas generated from the raw fuel, and the combustion gas obtained by burning the fuel gas as the anode off-gas is the reformer 1, the water evaporator 2 and the raw fuel. In the vaporizer 3, heat is exchanged with the raw material gas, the temperature drops to about 200 ° C., and reaches the temperature level of the reaction in the low-temperature shift converter 5 and the selective oxidation CO remover 6, so that the cylindrical shape serving as the flow path of the combustion gas Even if the reactor such as the low-temperature shift converter 5 and the selective oxidation CO remover 6 is exposed in the space 17, there is no fear of unnecessary heat exchange.

  In this way, it is possible to reduce the size of the apparatus and improve the thermal efficiency. Further, it is possible to greatly reduce the time and labor required for the construction of the heat insulating layer 9c and to perform maintenance easily.

In addition, as a prior art document of the fuel reformer, for example, there is Patent Document 1, which is not directly related to this case.
JP 2003-20203 A

  As described above, the burner combustion type fuel reformer shown in FIGS. 7 and 8 has various excellent advantages. However, when the raw material gas is reformed, the combustion apparatus 10 has an extremely high calorific value like the fuel gas such as the anode off-gas and the combustion fuel such as naphtha and city gas in order to obtain the heat source of the reformer 1. Two different types of fuel must be mixed and burned. Thus, in order to satisfactorily burn two types of fuel having extremely different calorific values, generally, the combustion device 10 must be a combustion device having a complicated structure provided with a plurality of fuel injection ports. Don't be. Further, in the power generation system using the polymer electrolyte fuel cell 8, the operating load is wide and the combustion apparatus 10 must be able to perform combustion at a large load ratio (turndown).

  However, in the combustion apparatus provided with a plurality of fuel injection ports, the structure is complicated and it is difficult to reduce the size, and the turndown cannot be increased. Furthermore, in order to optimize the injection amount of the fuel injection port, a small-diameter injection nozzle is required at the fuel injection port, the supply pressure of the fuel to the injection nozzle must be increased, and the mist in the anode off-gas As a result, the flow rate from the injection nozzle becomes uneven, and good combustion cannot be performed.

  In view of the above circumstances, the present invention is simple and compact in structure, can reduce the supply pressure of fuel, is not affected by anode off-gas, and has a uniform injection flow rate and good combustion. The object of the present invention is to provide a combustion apparatus for a fuel reformer that can be performed.

  According to the first aspect of the present invention, there is provided a raw material that feeds combustion gas to the outer peripheral side of the reforming tube housed in the flow path between the furnace tube and the inner tube disposed in the inner tube of the container and flows in the reforming tube. A combustion apparatus of a fuel reforming apparatus capable of reforming gas, wherein a plurality of air is provided on a peripheral wall portion at an upper end of a cylinder body connected to a lower end of the furnace cylinder so that air can be fed. A hollow cylindrical burner cone having a blowout hole is accommodated, a core having a predetermined shape is accommodated in the burner cone, and a flame holding space is formed between the burner cone and the core. A fuel gas supply pipe capable of supplying fuel gas to the flame holding space at a lower portion of the fuel gas supply pipe, and at least an upper end portion is disposed in the fuel gas supply pipe so that the combustion fuel is discharged from the upper space in the fuel gas supply pipe. A fuel supply pipe for combustion that can be sent to the flame holding space is provided. The fuel gas and the combustion fuel is obtained by adapted be delivered to the flame holding space through the lower surface of the core.

  In the invention of claim 2, the container is a vacuum heat insulating container. In the invention of claim 3, the air blowing holes are provided at predetermined intervals in the circumferential direction of the burner cone and are provided in a plurality of stages in the axial direction. In the invention of claim 4, the air blowing holes are arranged in a straight line, and in the invention of claim 5, at least the upper end portion of the fuel supply pipe for combustion is arranged concentrically in the fuel gas supply pipe. .

  In the present invention, the fuel gas is supplied to the fuel gas supply pipe, and the combustion fuel is supplied from the combustion fuel supply pipe to the fuel gas supply pipe. In this case, the fuel gas is distributed on the inner peripheral side of the fuel gas supply pipe, and the combustion fuel is distributed on the axial center side of the fuel gas. Thus, the fuel gas and the combustion fuel flow from the upper part in the fuel gas supply pipe through the lower surface of the core at a very low speed, are introduced into the flame holding space, and flow toward the burner cone. For this reason, the fuel gas and the combustion fuel are forcibly diffused to promote mixing. In the flame holding space, the fuel gas and the fuel for combustion burn in cooperation with the air introduced from the air blowing holes. As a result, a flame is formed in the air blowing hole to generate combustion gas, and the generated combustion gas is used for reforming the raw material gas.

  According to the combustion apparatus of the fuel reformer of the first to fifth aspects of the present invention, it is possible to perform stable combustion over a wide range of loads, and complete combustion without discharging unburned components. The fuel supply pressure can be reduced, and the combustion fuel is not affected by the supply pressure, and the jet flow rate is uniform and good combustion is possible. Furthermore, according to the combustion apparatus of the fuel reformer of claim 4, the mixture can be concentrated and can be prevented from disappearing at low load, and a wide range of loads and fuel types can be obtained. Various excellent effects, such as being able to maintain a stable combustion state at a supply ratio of, can be achieved.

Hereinafter, embodiments of the present invention will be described together with illustrated examples.
1 to 5 show an example of an embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 6 to 8 denote the same components, and the basic configuration is shown in FIG. This is substantially the same as that shown in FIG. Thus, in the illustrated example, the fuel gas connection seat 23 is fixed to the side portion of the duct 22 to which the air supply pipe 21 is connected, and the base inner cylinder 16 is connected to the duct 22 and the fuel gas connection seat 23. It is mounted and supported on the upper surface, and fixed.

  The upper end of the base inner cylinder 16 is connected to the lower end of the furnace cylinder 11, and the burner cone 24 constituting the combustion device 10 is concentric with the base inner cylinder 16 at the upper end portion in the base inner cylinder 16. The upper end portion is accommodated so as to be substantially the same height as the upper end portion of the base inner cylinder 16. The burner cone 24 has a hollow cylindrical shape with an upper opening, and a lower end is closed by a closing plate 24a. The outer diameter of the burner cone 24 is smaller than the inner diameter of the base inner cylinder 16, and the air flow from the air supply pipe 21 to the duct 22 and the base inner cylinder 16 is between the outer periphery of the burner cone 24 and the base inner cylinder 16. The air 25 fed through the path 18 can flow in.

  Between the upper end portion of the base inner cylinder 16 and the upper end portion of the burner cone 24, a ring-shaped blocking plate 26 is fixed so that air 25 is not discharged from between the upper end portion and the burner cone 24 in the axial direction and the circumferential direction. A plurality of air blowing holes 24b are provided at regular intervals. Thus, the air 25 fed between the base inner cylinder 16 and the burner cone 24 from below through the air flow path 18 in the base inner cylinder 16 will be introduced into the burner cone 24 from the air blowing hole 24b. It has become. In the illustrated example, the air blowing holes 24b are arranged in a straight line so that a grid pattern is formed by a line formed by connecting the centers of the air blowing holes 24b when the burner cone 24 is expanded. And a total of 48 diameters of about 1.7 mm, four stages in the axial direction, and 30 degrees apart in the circumferential direction.

  In the burner cone 24, the core 27 is concentric with the burner cone 24 and has an upper end located slightly below the upper end of the burner cone 24 and a lower end located slightly above the lower end of the burner cone 24. It is stored. The core 27 is integrally connected to the lower large-diameter cylindrical portion 27a and the upper end of the large-diameter cylindrical portion 27a, and is tapered so as to become smaller in diameter than the large-diameter cylindrical portion 27a. The tapered portion 27b is integrally connected to the upper end of the tapered portion 27b, and has a small diameter cylindrical portion 27c having the same diameter as the upper end portion of the tapered portion 27b. The core 27 is not limited to the shape shown in the figure, and may have various shapes such as a cylindrical shape, a truncated cone shape, and a bell shape, and may be a hollow body or a solid body.

  As shown in FIG. 5, the upper end of the fuel gas supply pipe 19 concentrically housed in the base inner cylinder 16 at the upper part penetrates the closing plate 24 a and slightly protrudes upward, from the lower end position of the core 27. Is located slightly below. Thus, a gap 30 is provided between the lower end of the core 27 and the upper end of the fuel gas supply pipe 19 so that the fuel gas 28 such as the anode off-gas and the combustion fuel 29 such as naphtha and city gas can flow. Is formed. The fuel gas supply pipe 19 extends downward from the base inner cylinder 16, and its lower end is connected to a fuel gas supply port 23 a provided in the fuel gas connection seat 23.

  In the fuel gas supply pipe 19, a combustion fuel supply pipe that extends into the fuel gas supply pipe 19 through the axial middle portion of the fuel gas supply pipe 19 in the longitudinal intermediate portion of the fuel gas supply pipe 19. 20 is housed concentrically with respect to the fuel gas supply pipe 19 and extends slightly below the upper end of the fuel gas supply pipe 19.

  An annular flame holding space 31 is formed between the inner periphery of the burner cone 24 and the outer periphery of the core 27. An interval in the radial direction of the flame holding space 31 is an interval at which the flame is satisfactorily held.

  Thus, the fuel gas 28 supplied through the fuel gas supply pipe 19 and the combustion fuel 29 supplied through the combustion fuel supply pipe 20 are separated from the upper end portion in the fuel gas supply pipe 19 by a gap 30. And is introduced into the flame-holding space 31 in the burner cone 24.

  In the flame-holding space 31, the fuel gas 28 and the combustion fuel 29 introduced through the gap 30 are burned in cooperation with the air 25 introduced from the air blowing holes 24b, so that a flame is formed in the air blowing holes 24b. 32a (refer FIG. 3) is formed, and the combustion gas 32 is produced | generated.

  A cylindrical shape in which the upper end is connected to the lower surface of the closing plate 24a and the lower end is closed by the bottom plate 33a so as to be located in the base inner cylinder 16 below the closing plate 24a and on the side of the fuel gas supply pipe 19. The short pipe 33 is accommodated in parallel with the fuel gas supply pipe 19. Thus, the short pipe 33 and the base inner cylinder 16 constitute a double pipe. An insulating plate and gasket 34 is attached to the lower surface of the short pipe 33, and one small-diameter air is provided on the side of the short pipe 33. An introduction port (not shown) is formed.

  A spark rod 35 is inserted into the short tube 33 through the bottom plate 33 a and the insulating plate / gasket 34. The insulating plate / gasket 34 functions as an insulating plate and can also perform gas sealing of the spark rod 35 penetrating portion. The upper end of the spark rod 35 is inserted into a hole 36 formed in the closing plate 24a and slightly protrudes into the flame holding space 31, and a high voltage cable 37 is connected to the lower end of the spark rod 35. The high voltage cable 37 extends downward in the base inner cylinder 16, and its lower end is connected to a conductive rod 38 provided horizontally in the duct 22. The conductive rod 38 is connected to a high voltage cable 39 inserted through the air supply pipe 21.

  The reason why the spark rod 35 is inserted into the short tube 33 is to prevent the air 25 from the base inner cylinder 16 from being excessively introduced into the flame holding space 31 from the hole 36.

  In the figure, reference numeral 40 denotes a hollow cylindrical bottomed guide tube 41 concentrically housed in the furnace tube 11 and extending from a predetermined position above the combustion apparatus 10 to a position slightly above the upper end of the reforming tube 13. Is a guide plate having a diameter larger than that of the furnace tube 11, fixed at the upper end of the guide tube 40, and 42 between the inner tube 9 a of the vacuum heat insulating container 9 and the furnace tube 11 so as to surround the reforming tube 13. A spiral plate provided spirally in the flow path 12, 43 is a raw material gas generated by desulfurization of a mixed gas of raw fuel and water vapor by the desulfurizer 4, 43 a is a reformed gas, and 44 is an exhaust gas It is.

Next, the operation of the illustrated example will be described.
It is necessary to heat the fuel reforming device at the time of starting when generating power with the polymer electrolyte fuel cell 8 shown in FIG. In this case, the combustion fuel 29 is blown into the fuel gas supply pipe 19 from the combustion fuel supply pipe 20 as a starting fuel, and the flame holding space in the burner cone 24 from the fuel gas supply pipe 19 through the gap 30. The air 25 is introduced into the flame holding space 31 from the hole 36 through a small hole provided in the short tube 33, the spark rod 35 is energized to generate a spark, and the flame holding space in the burner cone 24. The combustion fuel 29 supplied into 31 is ignited.

  Thus, the gas obtained by ignition is circulated through the gap between the furnace tube 11 and the guide tube 40, the flow path 12, and the entire apparatus such as the reforming tube 13 is heated. Since it is not directly related to the gist of the invention, detailed description is omitted.

  When power is generated by the polymer electrolyte fuel cell 8, the raw material gas needs to be reformed by the reformer 1. For this reason, in the fuel reformer shown in FIG. 1, water is converted into steam by the water evaporator 2, and raw fuel such as naphtha is vaporized by the raw fuel vaporizer 3, and the raw fuel mixed with the steam is desulfurized. The raw material gas 43 is generated by being guided to the reactor 4 and desulfurized, and the raw material gas 43 is guided between the outer tube 13b and the inner tube 13a of the reformer 13 in the reformer 1 and rises. Is reversed at the upper end of the inner pipe 13a and descends in the inner pipe 13a. During this rise and fall, the gas is heated and reformed by the combustion gas 32 as described below to become a reformed gas 43a.

  On the other hand, the fuel gas 28 having a large flow rate and a low calorie introduced into the fuel gas supply pipe 19 from the fuel gas supply port 23 a rises and is distributed on the inner peripheral wall side (outside) of the fuel gas supply pipe 19. The low-flow and high-calorie combustion fuel 29 fed to the upper space in the supply pipe 19 and introduced into the combustion fuel supply pipe 20 extends from the upper end of the combustion fuel supply pipe 20 to the upper part of the fuel gas supply pipe 19. The fuel gas is supplied so as to be distributed on the axial center side (inside) of the fuel gas supply pipe 19 in the space.

  Thus, the fuel gas 28 and the combustion fuel 29 flow while mixing in the upper space in the fuel gas supply pipe 19 and are diffused from the gap 30 below the core 27 toward the inner peripheral side in the radial direction of the burner cone 24. It is injected into the flame holding space 31 in the cone 24 at a very low flow rate. For this reason, the fuel gas 28 and the combustion fuel 29 are diffused into the flame holding space 31.

  The air 25 is introduced from the air supply pipe 21 through the duct 22 into the base inner cylinder 16, rises in the air flow path 18, and is introduced into the flame holding space 31 from the air blowing hole 24 b of the burner cone 24.

  In the flame holding space 31, the mixing of the fuel gas 28, the combustion fuel 29 and the air 25 is promoted to perform combustion, and a flame 32 a is formed in the portion of the air blowing hole 24 b, and combustion is performed at a high temperature (about 1200 ° C.). Gas 32 is produced.

  By appropriately setting the number, diameter, number of steps, and circumferential interval of the air outlet holes 24b of the burner cone 24, combustion over a wide load range is possible, and complete combustion with no unburned portion is possible. .

  The combustion gas 32 rises uniformly and at high speed without drifting in a narrow gap between the furnace tube 11 and the guide tube 40. The flow of the combustion gas 32 at the time of ascending becomes a parallel flow with respect to the raw material gas 43 and the reformed gas 43a that ascend or descend the reforming pipe 13. Thus, when the combustion gas 32 is caused to flow upward in a narrow gap between the furnace tube 11 and the guide tube 40 so as to be in parallel with the raw material gas 43 flowing through the reforming tube 13, convection transfer by the combustion gas 32 is performed. Heat is accelerated and the furnace tube 11 is heated red, and the reforming tube 13 is heated by the radiant heat transfer of the furnace tube 11.

  The combustion gas 32 that has risen to the upper end of the narrow gap between the furnace tube 11 and the guide tube 40 is reversed by the guide plate 41, and the flow path 12 between the inner tube 9 a and the furnace tube 11 is changed to the spiral plate 42. The reforming pipe 13 descends while flowing so as to traverse the reforming pipe 13 in the radial direction, and the reforming pipe 13 is heated by convection heat transfer. Thereafter, the water evaporator 2, the desulfurizer 4, the low temperature shift converter 5, It passes through a cylindrical space 17 in which the raw fuel vaporizer 3 and the selective oxidation CO remover 6 are housed, and is discharged outside as a combustion gas discharge port 15a provided at the lower end portion of the base outer cylinder 15. .

  The raw material gas 43 flowing upward and downward in the reforming pipe 13 and the reformed gas 43a obtained by reforming a part of the raw material gas 43 are radiated by radiant heat transfer of the furnace tube 11 heated by the combustion gas 32. While being heated, convection is transferred by the combustion gas 32 that descends while flowing in a spiral manner along the spiral plate 42 in the flow path 12 between the inner cylinder 9a and the furnace cylinder 11 so as to cross the reforming pipe 13 in the radial direction. When heated by heat and sent from the reforming tube 13, the whole becomes the reformed gas 43a.

  According to the illustrated example of the present invention, since the fuel gas supply pipe 20 is disposed in the fuel gas supply pipe 19 on the upper end side in a concentric manner, the fuel gas supply pipe 19 is fed from the fuel gas supply pipe 19. The fuel gas 28 and the combustion fuel 29 fed from the combustion fuel supply pipe 20 are mixed well without compulsory mixing, and therefore a mixer is unnecessary and the structure is simplified. Can do. In addition, since the area of the gap at the lower portion of the core 27 through which the fuel gas 28 and the combustion fuel 29 are jetted into the flame holding space 31 is large, there is no possibility of clogging by this mist, so that the combustion is stabilized. In addition, the supply pressure of the fuel gas 28 and the combustion fuel 29 may be low, and the efficiency of the system is improved.

  Since the combustion apparatus 10 includes the core 27 having an appropriate shape in the burner cone 24, the fuel gas 28 and the combustion fuel 29 injected at a low speed from the gap on the lower surface of the core 27 into the flame holding space 31. The fuel is forcibly diffused to the inner periphery of the burner cone 24. Therefore, mixing of the fuel and the air 25 injected into the flame holding space 31 from the air blowing holes 24b is promoted.

  Further, since the dimension in the diameter direction of the burner cone 24 can be kept moderate, the flame holding space 31 inside the burner cone 24 can be secured, and the fuel gas 28 and the combustion fuel 29 can be stably burned. Further, since the air blowing holes 24b can be spaced apart from each other by the air 25 to be blown out, stable combustion can be performed from this point without the flame 32a interfering.

  Therefore, according to the combustion apparatus 10 of the illustrated example, stable combustion can be performed in a wide load range by appropriately taking the ratio of the supply of the fuel gas 28 and the combustion fuel 29, and unburned It is possible to perform complete combustion without discharging the minute. Further, the combustion apparatus 10 has a simple and small structure, can reduce the supply pressure of the fuel, and the combustion fuel 29 is not affected by the supply pressure, and the injection flow rate is uniform and good. Combustion can be performed.

  Further, according to the illustrated example, by arranging the air blowing holes 24b in a straight line, it is possible to increase the concentration of the air-fuel mixture, prevent the extinction at low load, and at a wide range of load and fuel type supply ratio. A stable fuel state can be maintained.

  In the combustion apparatus of the fuel reformer of the present invention, the raw fuel supplied to the raw fuel carburetor may be used as the combustion fuel, or may be supplied from an independent line different from the raw fuel. Of course, it is possible to use the combustion fuel obtained, and other various modifications can be made without departing from the scope of the present invention.

It is a longitudinal cross-sectional view which shows an example of embodiment of the combustion apparatus of the fuel reformer of this invention. It is a longitudinal cross-sectional view which expands and shows the system | strain which supplies the fuel gas of lower part and the fuel for combustion, and air rather than the combustion apparatus of FIG. It is a III-III direction arrow directional view of FIG. It is the IV-IV direction arrow directional view of FIG. It is a longitudinal cross-sectional view which shows the detail of the combustion apparatus of FIG. 1, FIG. 2, and its vicinity. It is a whole system diagram showing an example of the equipment provided with a reformer. It is a longitudinal cross-sectional view of an example of a burner combustion type fuel reformer. It is a VIII-VIII direction arrow line view of FIG.

Explanation of symbols

9 Vacuum insulated container (container)
DESCRIPTION OF SYMBOLS 10 Combustion apparatus 11 Furnace cylinder 12 Flow path 13 Reformation pipe 16 Base inner cylinder (cylinder)
19 Fuel gas supply pipe 20 Combustion fuel supply pipe 24 Burner cone 24b Air outlet hole 25 Air 27 Core 28 Fuel gas 29 Combustion fuel 31 Flame holding space 32 Combustion gas 43 Raw material gas

Claims (5)

  It is possible to reform the raw material gas flowing in the reforming pipe by supplying combustion gas to the outer peripheral side of the reforming pipe housed in the flow path between the furnace cylinder and the inner cylinder arranged in the inner cylinder of the container A combustion apparatus for a fuel reformer, wherein a hollow cylinder having a plurality of air blowing holes in a peripheral wall portion at an upper end of a cylinder connected to a lower end of the furnace cylinder so as to be able to feed air And a core having a predetermined shape is housed in the burner cone to form a flame-holding space between the burner cone and the core, and a fuel gas is placed below the burner cone. A fuel gas supply pipe capable of being supplied to the flame holding space, and at least an upper end portion is disposed in the fuel gas supply pipe to supply combustion fuel from an upper space in the fuel gas supply pipe to the flame holding space. A combustion fuel supply pipe is provided, the fuel gas and Combustion of a fuel reforming apparatus, characterized in that the baked fuel and configured to be delivered to the flame holding space through the lower surface of the core.   The combustion apparatus for a fuel reformer according to claim 1, wherein the container is a vacuum heat insulating container.   The combustion apparatus for a fuel reformer according to claim 1 or 2, wherein the air blowing holes are provided at predetermined intervals in the circumferential direction of the burner cone and are provided in a plurality of stages in the axial direction.   The combustion apparatus for a fuel reformer according to claim 3, wherein the air blowing holes are arranged in a straight line.   The combustion apparatus for a fuel reformer according to claim 1, 2, 3, or 4, wherein at least an upper end portion of the combustion fuel supply pipe is concentrically disposed in the fuel gas supply pipe.

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