CN104112867B - The reforming reaction device of a kind of SOFC system burning capacity cascade utilization and electricity generation system - Google Patents

Abstract

The invention provides a reforming reaction device for cascaded utilization of combustion energy in an SOFC system, the device includes a gas-air premixer, a combustion chamber and a reforming chamber located on the periphery of the combustion chamber, and also includes pre-reformed flue gas radiation cavity and pre-reform cavity. Wherein, the combustion chamber is communicated with the gas-air premixer, the pre-reformed flue gas radiation chamber is communicated with the combustion chamber, and the pre-reformation flue gas radiation chamber is located at the The periphery, and the pre-reforming chamber communicates with the reforming chamber. The device also includes a water-methane pre-mixer and a vaporization preheating chamber, the vaporization pre-heating chamber communicates with the pre-reformed flue gas radiation chamber, and the water-methane pre-mixer is located between the vaporization pre-heating chamber Inside and communicated with the pre-reforming chamber. The heat energy generated by the combustion chamber passes through the reforming chamber, the pre-reforming chamber and the water-methane premixer for multiple cascaded heat exchanges, so that the combustion energy can be utilized in cascades, the structure of the entire device can be simplified, and the integration of the device can be improved.

Description

A reforming reaction device and power generation system for cascade utilization of combustion energy for SOFC systems

technical field

The invention relates to the fields of heat treatment technology and catalysis. Specifically, the invention relates to a reforming reaction device for cascade utilization of combustion energy in an SOFC system, and an SOFC power generation system using the reforming reaction device.

Background technique

Solid oxide fuel cell (solid oxide fuel cell) system, that is, SOFC power generation system, is a new type of power generation device, which belongs to the third generation of fuel cells. An all-solid-state chemical power generation device that can be converted into electrical energy friendly.

SOFC power generation system is an energy conversion device that converts fuel from chemical energy into electrical energy and thermal energy. Its high efficiency, pollution-free, and all-solid-state structure have made it one of the most important energy conversion tools with the most potential. SOFC power generation systems have great advantages in terms of fuel efficiency, emissions, maintenance and noise pollution.

A typical SOFC combined heat and power system includes a fuel treatment system, a SOFC body power generation system, a direct current alternating current conversion system, and a waste heat recovery system. The required equipment includes compressors, steam generators, reforming reactors, heat exchangers, and burners, etc. .

Gas fuel or liquid fuel generally needs to be converted into synthesis gas of H ₂ and CO before entering the battery stack for electrochemical reaction. Fuel cells using natural gas as raw materials usually use steam reforming (CH ₄ +H ₂ O→CO+3H ₂ ) produces hydrogen in real time. This reaction is a strong endothermic reaction (△H298K=+226kJ/mol), and the heat required for the reaction comes from the burner. The burner provides heat for the entire system by burning the anode exhaust gas from the SOFC stack, and for the SOFC system, the reforming reaction is the main consumer of this energy.

According to whether the reforming reaction occurs inside or outside the battery, it can be divided into internal reforming and external reforming. Internal reforming tends to cause uneven temperature distribution across the electrodes and carbon deposition reactions occur, resulting in a significant drop in battery power density. The external reforming technology by attaching a special reforming reactor outside the battery is relatively mature, and it is the most mainstream hydrogen production method for existing fuel cell application systems in the world.

The current reforming reaction device is mainly composed of a separate reforming reactor and a tail gas burner. The high-temperature flue gas generated by the combustion of the SOFC stack tail gas scours the wall of the reforming reactor to complete heat exchange, and then the reforming The reaction is heated. The bottleneck of this heat transfer method is that the heat transfer coefficient of the high-temperature flue gas flushing the wall of the reforming reactor is low. In order to achieve the expected heat transfer effect, a larger heat transfer area is required, resulting in this discrete type. The reforming reaction device is bulky, has low system integration, and is prone to structural interference with other components in the device system.

On the other hand, the raw materials required for the reforming reaction are natural gas and steam. In order to achieve a higher reaction efficiency for the reforming reaction, the raw material needs to pass through the raw material premixer before entering the reformer for reaction, so that the natural gas and water vapor can be fully mixed and preheated. In addition, it is also necessary to heat the liquid water through a steam generator to generate the required water vapor.

To sum up, there is an urgent need in this field to develop a reforming reaction device with small volume, simple device and high efficiency.

Contents of the invention

The invention provides a reforming reaction device with small volume and high thermal efficiency.

The first aspect of the present invention provides a reforming reaction device for cascaded utilization of combustion energy in a solid oxide fuel cell (solid oxide fuel cell, SOFC) system. The device includes a gas-air premixer, a combustion chamber, and a The peripheral reforming chamber also includes: a pre-reforming flue gas radiation chamber and a pre-reforming chamber;

Wherein, the combustion chamber communicates with the gas-air premixer;

The pre-reformed flue gas radiating chamber communicates with the combustion chamber; and

The pre-reforming chamber is located on the periphery of the pre-reforming flue gas radiation chamber, and the pre-reforming chamber communicates with the reforming chamber.

In another preferred example, the device further includes a water-methane premixer and a vaporization preheating chamber.

In another preferred example, the vaporization preheating chamber communicates with the pre-reforming flue gas radiation chamber; the water-methane premixer is located in the vaporization preheating chamber and communicates with the pre-reforming chamber.

In another preferred example, the device also has one or more of the following features:

The combustion chamber is located above the gas-air premixer;

The pre-reformed flue gas radiation chamber is located above the combustion chamber; and/or

The pre-reforming chamber is located above the reforming chamber.

In another preferred example, the combustion chamber further includes a filled porous medium body.

In another preferred example, the pore size and distribution density of the porous medium body gradually change from small to large according to the flow direction of the gas-air mixture from upstream to downstream.

In another preferred example, the pore diameter of the porous medium body is 30-120mm, and/or the pore distribution density of the porous medium body is 60PPI-10PPI.

In another preferred example, the periphery of the porous medium body is edge-sealed.

In another preferred example, the porous medium body includes SiC, ZrO ₂ or Al ₂ O ₃ foamed ceramics.

In another preferred example, the gap between the porous medium body and the outer wall of the combustion chamber is filled with SiC or Al ₂ O ₃ slurry.

In another preferred example, splitter fins are provided inside the pre-reforming chamber and the reforming chamber.

In another preferred example, the splitter fins are longitudinally distributed along the flow direction of the reforming reaction raw material gas flow from upstream to downstream, and the splitter fins longitudinally divide the pre-reforming chamber and the interior of the reforming chamber into n airflows Compartments, where n=4-16 positive integers.

In another preferred example, the number of the splitter fins is 4-16.

In another preferred embodiment, the pre-reforming chamber and the reforming chamber also contain a catalyst, preferably the catalyst is a granular catalyst filled and distributed between the splitter fins.

In another preferred example, the pre-reforming chamber is also provided with a gas distribution plate, and the gas distribution plate is used to collect the mixed gas in the air pre-mixing chamber and send the mixed gas along the distribution fins slices flow into the pre-reforming chamber.

In another preferred example, the gas distribution plate is arranged inside the pre-reforming chamber, and the gas distribution plate communicates with each airflow compartment.

In another preferred example, the reforming chamber is further provided with a gas collecting plate.

In another preferred example, the reforming chamber is also provided with a reformed product output pipe.

In another preferred example, the gas collecting tray is arranged inside the reforming chamber, and the gas collecting tray communicates with each airflow compartment and is connected with the reformed product output pipe.

In another preferred example, the water-methane premixer includes a water input pipe, a methane input pipe and a vaporization preheating pipe.

In another preferred example, both the water input pipe and the methane input pipe are connected to the vaporization preheating pipe.

In another preferred example, liquid water and methane are passed into the vaporization preheating pipe through the water input pipe and the methane input pipe respectively.

In another preferred example, the vaporization preheating pipes are coiled and distributed inside the vaporization preheating chamber.

In another preferred example, the water-methane premixer is also provided with a preheating buffer chamber.

In another preferred example, the preheating buffer chamber communicates with the vaporization preheating pipe.

In another preferred example, the vaporization preheating pipe is coiled around the periphery of the preheating buffer chamber.

In another preferred example, the water-methane premixer is further provided with a shunt pipe, and the shunt pipe communicates with the preheating buffer chamber and the prereforming chamber.

In another preferred example, the number of said shunt tubes is 4-16.

In another preferred example, the shape of the preheating buffer chamber is a cylinder.

In another preferred example, the preheating buffer chamber is filled with thermally conductive materials, wherein the thermally conductive materials include metal foam, metal mesh, and porous dielectric materials.

In another preferred example, the diameters of the vaporization preheating pipes are the same or different.

In another preferred example, the vaporization preheating pipe includes a vaporization preheating thin coil and a vaporization superheating coarse coil.

In another preferred example, the vaporization preheating thin coil is arranged upstream of the water-methane mixed gas flow, and the vaporization superheating thick coil is arranged downstream of the water-methane mixed gas flow.

In another preferred example, the vaporization superheating thick coil is coiled around the periphery of the preheating buffer chamber, and the vaporization preheating rough disk is connected to the preheating buffer chamber.

In another preferred example, the vaporization preheating thin coil is wound around the periphery of the vaporization superheating coarse coil.

In another preferred example, there is a gap between the vaporization preheating thin coil, the vaporization superheating thick coil and the preheating buffer chamber.

In another preferred example, the gas-air premixer includes a gas input pipe, an air input pipe and a gas-air premix chamber.

In another preferred example, the gas-air premixing chamber further includes a primary cylindrical premixing chamber and a secondary conical premixing chamber, the primary cylindrical premixing chamber and the secondary conical premixing chamber Mixed cavities are connected.

In another preferred example, the gas input pipe and the air input pipe communicate with the primary cylindrical pre-mixing chamber.

In another preferred example, the gas input pipe extends from outside to inside into the first-stage cylindrical premixing chamber.

In another preferred example, the end of the gas input pipe located in the primary cylindrical premixing chamber is closed, and/or the gas input pipe is located on the side wall of the pipeline in the primary cylindrical premixing chamber Equipped with injection holes.

In another preferred example, an anti-tempering straight-hole ceramic plate is also provided between the secondary conical premixing chamber and the combustion chamber.

In another preferred example, the pore diameter and porosity of the tempering-proof straight-hole ceramic plate are determined according to the tempering limit theory.

The second aspect of the present invention provides a fuel power generation system, which has the reforming reaction device for cascade utilization of combustion energy in the SOFC system described in the first aspect of the present invention, a fuel cell, an air compressor, a water separator, a water tank, and a metering system. Pumps, various valve control and temperature control devices.

It should be understood that within the scope of the present invention, the above-mentioned technical features of the present invention and the technical features specifically described in the following (such as embodiments) can be combined with each other to form new or preferred technical solutions. Due to space limitations, we will not repeat them here.

Description of drawings

Fig. 1 is a schematic diagram of cascaded utilization of combustion energy in the reforming reaction of the present invention.

Fig. 2 is a schematic diagram of the appearance of the device of the embodiment of the present invention.

Fig. 3 is a schematic diagram of the internal structure of the device of the embodiment of the present invention.

Fig. 4 is a schematic diagram of the structure of the shunt pipe where the water-methane premixer communicates with the pre-reforming chamber in the embodiment device of the present invention.

Fig. 5 is a schematic diagram of the cross-section at P1-P1 of the pre-reforming chamber and the pre-reforming flue gas radiation chamber in the device according to the embodiment of the present invention.

In the figure, 1—gas input pipe; 2—air input pipe; 3—first-stage cylindrical premixing chamber; 4—monitoring thermocouple of premixing chamber; 5—secondary conical premixing chamber; 6—bolt; 7— Insulation pad; 8—anti-tempering straight-hole ceramic plate; 9—reformed product output pipe; 10—gas collecting plate; 11—catalyst lower hole plate; 12—granular catalyst; 13—combustion chamber; 14—spark plug; 15—pre-reforming flue gas radiation chamber; 16—reaction device shell; 17—outer wall of pre-reforming flue gas radiation chamber; 18—distributor fin; 19—catalyst upper orifice plate; 20—gas distribution plate; ;22—bolt; 23—vaporization preheating thin coil; 24—vaporization superheating coarse coil; 25—preheating buffer chamber; 26—outer wall of preheating buffer chamber; 27—vaporization preheating chamber shell; 28—exhaust ; 29—water input pipe; 30—methane input pipe; 31—temperature controller.

detailed description

After long-term and in-depth research, the inventor first set the reforming chamber in the reforming reaction device on the periphery of the combustion chamber, and integrated the reforming reactor, tail gas burner, raw material premixer and steam generator into an integrated device , combined with porous media combustion technology, so that the high-temperature flue gas generated in the combustion chamber can be sequentially passed through the reforming chamber, pre-reforming chamber and water-methane premixer for multiple cascaded heat exchanges.

Gas-air premixer

The gas-air premixer includes a gas input pipe, an air input pipe, a first-stage cylindrical premix chamber, a second-stage conical premix chamber, a thermocouple for monitoring the temperature of the premix chamber, and a backfire-proof straight-hole ceramic plate.

Wherein, the gas input pipe and the air input pipe communicate with the first-stage cylindrical premixing chamber. Usually, the gas input pipe extends into the first-stage cylindrical premixing chamber. In another preferred example, in order to more fully mix the gas and air, the end of the end of the gas input pipe extending into the primary cylindrical premixing chamber is a closed structure, and the gas input pipe is located in the primary premixing chamber There are several injection holes on the side wall of the pipe. The gas is sprayed 360 degrees from the small hole on the side wall of the gas inlet pipe into the first-stage cylindrical premix chamber, and is effectively mixed with the air introduced by the air inlet pipe, and then the premixed gas is passed into the second-stage conical chamber. The premixing chamber further completes the thorough mixing, and the fully mixed premixed gas is rectified through the anti-tempering straight-hole ceramic plate, and then passed into the combustion chamber for combustion.

The diameter of the gas inlet pipe that can be used in the present invention is not particularly limited, and can be any size that is compatible with the SOFC anode tail gas flow and pressure, and can correspond to the premixing chamber. The preferred diameter is 6-12mm.

The diameter of the air inlet pipe that can be used in the present invention is not particularly limited, and can be any size that can meet the SOFC anode tail gas flow ratio and can correspond to the premixing chamber. The preferred diameter is 10-20mm.

The flashback prevention device that can be used in the present invention is not particularly limited, and can be any device that can isolate the combustion flame.

Usually, the material of the anti-tempering device can be ceramic plate, cordierite, refractory brick, mullite plate and other materials with low thermal conductivity. Its diameter may be the same as that of the porous medium body, preferably smaller than the minimum diameter of the porous medium body. In order to better achieve the anti-tempering effect, the thickness of the ceramic plate is preferably not less than 10 mm.

In another preferred example, the ceramic plate can be a straight-hole ceramic plate, and several small holes are evenly distributed on the straight-hole plate, and the hole diameter is not more than 1mm, and its porosity is set according to the minimum flow rate of the premixed gas, so that The velocity of the airflow after passing through the straight orifice plate is always higher than the propagation velocity of the flame, so as to prevent the occurrence of tempering, and at the same time play a role in rectifying the premixed gas. In addition, a thermocouple can be set on the secondary cylindrical premixing chamber to monitor the temperature of the premixing chamber, so as to ensure that the combustion flame is stable in the porous medium without backfire.

In the present invention, there is no special limitation on the connection mode between the gas-air premixer and the combustion chamber-reforming chamber, and any firm, tight and high-temperature-resistant connection can be used. Usually, the gas-air premixer and the combustion chamber-reforming chamber can be connected by bolts.

In addition, a thermal insulation pad is preferably provided at the connection between the reforming chamber and the premixing chamber to minimize heat transfer from the combustion chamber and the reforming chamber to the premixing chamber and prevent spontaneous combustion of the premixed gas in the premixing chamber.

The present invention has no special limitation on the position of the gas-air premixer and the way of communicating with the combustion chamber. The gas-air premixer can be located below the combustion chamber, or it can be an independent device separated from the whole reforming reaction device.

Reforming Chamber and Combustion Chamber

In the present invention, the reforming chamber is arranged on the periphery of the combustion chamber, so that the heat generated by combustion is directly transferred to the inside of the reforming chamber through the outer wall of the combustion chamber. Since the steam methane reforming reaction is generally above 500 degrees, increasing the temperature (above 700 degrees) is conducive to improving the conversion rate of methane, so the high-quality heat of the combustion chamber is preferentially provided to the reforming chamber to carry out the reforming reaction.

In the present invention, the reforming chamber includes a gas collector plate, a catalyst lower orifice plate, a granular catalyst, a splitter fin, a reformed product output pipe and a part of the shell of the reaction device.

The fillers that can be used in the combustion chamber of the present invention are not particularly limited. For more complete combustion of gas and full utilization of heat, the combustion chamber can be filled with porous media.

Porous media combustion technology is a method of stabilizing the combustion of premixed gas fuel in the pores of porous media with high temperature resistance and good thermal conductivity and radiation performance. The thermal storage performance of porous media is used to store the combustion heat inside the porous media. The unburned premixed gas is preheated so that the premixed combustion flame temperature is greater than the adiabatic flame mixing degree. When the gas-air premixed gas enters the combustion chamber after being rectified by the backfire prevention device, it is ignited by the spark plug and burns in the porous medium body.

The pore size and distribution density of the porous medium body are not particularly limited, and both can enhance the heat utilization of gas combustion. Of course, the preferred way is to distribute the gas-air mixture gradually from small to large according to the flow direction of the gas-air mixture from upstream to downstream. The pore diameter can be set between 30-120mm, and the pore distribution density can gradually transition from 60PPI to 10PPI.

The material of the porous medium body can be composed of SiC, ZrO ₂ or Al ₂ O ₃ foamed ceramics. In addition, in order to stabilize the combustion of the gas inside the medium body and in order to strengthen the heat exchange between the porous medium body and the outer wall of the combustion chamber, it is also preferable to carry out edge sealing treatment around the porous medium body and seal the porous medium body and the outer wall of the combustion chamber. Fill the gap between SiC or Al ₂ O ₃ paste.

The shapes of the combustion chamber and the reforming chamber in the present invention are not particularly limited. Normally, the shape of the combustion chamber is cylindrical, and the reforming chamber is arranged on the periphery of the combustion chamber, which is in the shape of a circular cylinder, such as the technical solution provided by this embodiment. The combustion chamber can also be in various shapes such as quadrangular cylinder, pentagonal cylinder, hexagonal cylinder, etc., and the reforming chamber can also be in various shapes arranged on the periphery of the combustion chamber.

Pre-reforming chamber and pre-reforming flue gas radiation chamber

In the present invention, the pre-reforming chamber is arranged on the periphery of the pre-reforming flue gas radiation chamber. After the heat generated by combustion is directly transferred to the inside of the reforming chamber through the outer wall of the combustion chamber, the combustion also produces a large amount of high-temperature flue gas. After exiting the combustion chamber, the high-temperature flue gas enters the pre-reforming flue gas radiation chamber, and exchanges heat with the pre-reforming chamber through the outer wall of the pre-reforming flue gas radiation chamber. This process is a secondary utilization of combustion energy.

In the present invention, the pre-reforming chamber includes a gas distribution plate, a catalyst upper orifice plate, a granular catalyst, a distribution fin and a part of the shell of the reaction device. The internal structures of the pre-reforming chamber and the reforming chamber are basically the same between the catalyst upper orifice plate and the catalyst lower orifice plate, and the insides of the pre-reforming chamber and the reforming chamber communicate with each other. The water vapor and methane mixed gas treated by the water-methane premixer enters the pre-reforming chamber through the distribution pipe, and is evenly distributed to each independent compartment between the distribution fins through the gas distribution plate and the orifice plate on the catalyst, and then Enter the reforming chamber around the combustion chamber to react. After the reforming reaction is completed, the reformed product gas flows through the lower orifice plate of the catalyst to the gas collecting plate, and finally flows out of the reforming chamber through the reformed product output pipe to complete the reaction.

As shown in Figure 5, it is a schematic cross-sectional view of the pre-reforming chamber in the direction of P1-P1. The splitter fins are longitudinally distributed along the flow direction of the reforming reaction raw material gas flow from upstream to downstream, and 4-16 splitter fins divide the annular pre-reformer The reforming chamber is divided into several independent gas flow compartments. After the water-methane premixed gas flows into the pre-reforming chamber from the gas distribution plate and the orifice plate on the catalyst, it is evenly distributed into each compartment of the catalyst room; at the same time, the splitter fins It also plays the role of increasing the heat exchange area between the porous medium body and the reforming cavity, and enhancing the heat exchange effect. A number of temperature controllers are installed in the reforming chamber and the pre-reforming chamber to display the temperature of multiple positions in the upper and lower chambers, and the temperature of the reforming reaction is controlled by controlling the combustion power.

The heat received by the pre-reforming chamber is smaller than the heat received by the reforming chamber. Before entering the reforming chamber, the mixed gas of water vapor and methane goes through the pre-reforming process, is heated and activated, thereby improving the next step of reforming. The efficiency of the reaction.

The pre-reforming flue gas radiating cavity in this embodiment is a cylindrical cavity, and the high-temperature flue gas generated by the combustion chamber is discharged into the pre-reforming flue gas radiating cavity. The reforming chamber performs heat exchange.

The present invention has no special limitation on the shape of the pre-reforming flue gas radiation chamber and the pre-reforming chamber. Usually, the pre-reforming flue gas radiating chamber and the pre-reforming chamber communicate with the combustion chamber and the reforming chamber respectively and have the same shape, which may be cylindrical. The pre-reforming flue gas radiation chamber can also be in various shapes such as quadrangular cylinder, pentagonal cylinder, hexagonal cylinder, etc. The pre-reforming chamber can also be a plurality of shapes that are arranged on the periphery of the pre-reforming flue gas radiation chamber. kind of shape.

In the present invention, there is no particular limitation on the distribution of the splitter fins and the number of the splitter fins, as long as the gas can be divided evenly and the heat exchange area can be increased. Usually, the splitter fins are longitudinally distributed along the flow direction of the reforming reaction raw material gas flow from upstream to downstream. The splitter fins can also be arranged in a spiral shape or in a staggered distribution. The number of splitter fins can be one or more. Preferably, the position and quantity of the splitter fins correspond to the splitter tubes.

Water-methane pre-mixer and vaporization preheating chamber

The vaporization preheating chamber that can be used in the present invention is located above the pre-reforming flue gas radiation chamber and communicated with it. A water-methane premixer is integrated in the vaporization preheating chamber to make the residual combustion after the pre-reforming process The heat is further utilized to preheat the vaporization of the water-methane mixture, and finally the flue gas is discharged from the uppermost exhaust port. This process is the tertiary utilization of combustion energy.

In the present invention, the water-methane premixer includes a liquid water input pipe, a reformed methane input pipe, a vaporization preheating pipe, a preheating buffer chamber and a shunt pipe.

The vaporization preheating tubes that can be used in the present invention can be set as vertical tubes, spiral coils or any other forms. Preferably, in order to vaporize the liquid water more fully and mix it with methane more uniformly, the vaporization preheating pipe can be arranged inside the water-methane premixer in the form of a coil. In addition, the pipe diameters of the vaporization preheating pipes can be the same or different from the intake end to the mixing end. Preferably, the vaporization preheating pipes can be configured as vaporization preheating thin coils and vaporization superheating coarse coils.

In another preferred example, when the liquid water of 1-160g/min is fed by the liquid water input pipe, the reformed methane of 1-65SLM enters the vaporization preheating thin coil tube with an outer diameter of 2-6mm from the reformed methane input pipe. Preliminary mixing, preheating and vaporization. The vaporized and expanded mixed gas enters the vaporized superheated coarse coil with an inner diameter of 6-16mm for further vaporization and superheating, and then enters the preheated buffer chamber with a middle diameter of 50-102mm to complete the mixing. It is led into the pre-reforming chamber by the shunt pipe.

In order to improve the heat exchange efficiency between the combustion flue gas and the coil, there may be gaps between the outer thin vaporization preheating coil and the shell of the vaporization preheating chamber, and between the inner and outer coils. In another preferred example, the gap should be set between not less than 0.25 times the outer diameter of the coil and not greater than 0.25 times the outer diameter of the coil plus 2 mm.

In order to fully mix the water-methane premixed gas before entering the pre-reforming chamber and play the role of stabilizing and buffering the air flow, the space of the preheating buffer chamber should be set to be larger than the pipe diameter of the vaporization coil.

In addition, the preheating buffer chamber can optionally be provided with thermally conductive fillers. Preferably, the interior of the preheating buffer wall is filled with metal foam, metal mesh, or porous medium material with good thermal conductivity, so as to enhance the heat exchange effect.

In the present invention, the water-to-carbon ratio of the reforming reaction can be adjusted by adjusting the inflow of liquid water, and the preheating temperature of water vapor and methane can be controlled by adjusting the combustion power through the display temperature of the temperature controller.

In the present invention, as shown in Figure 4, the water-methane premixed gas shunt pipe is made up of 4-16 shunt pipes with a diameter of 4-15mm evenly distributed in the center of the pre-reforming chamber, and the water flowing out from the preheating buffer chamber - The methane premixed gas flows from the distribution pipe into the gas distribution plate in the pre-reforming chamber. The purpose of setting the shunt pipe is to enable the mixed gas to flow evenly between the compartments in the pre-reforming chamber, and at the same time play a role of buffering pressure. Of course, the pipe diameter and quantity of the splitter tubes that can be used in the present invention are not particularly limited, and can be two or more splitters that communicate with the splitter plate and correspond to the position of the splitter fins, and can evenly split the mixed gas. Tube.

Beneficial effects of the present invention

The invention provides a reforming reaction device for cascade utilization of combustion energy used in an SOFC system. In this device, the reforming chamber is arranged on the periphery of the combustion chamber, the pre-reforming chamber is arranged on the periphery of the pre-reforming flue gas radiation chamber, and the water-methane premixer is arranged in the vaporization preheating chamber, and the vaporization preheating chamber The heat chamber is connected with the pre-reforming flue gas radiation chamber, so that the heat energy generated by the combustion chamber passes through the reforming chamber, the pre-reforming chamber and the water-methane premixer for multiple cascade heat exchanges, and the combustion, vaporization, and preheating , mixing, reforming and other functions are integrated in one, and the structure is simple, which can meet the requirements of miniaturization, save the steam generator, and improve the integration of the device; at the same time, through the use of porous media combustion technology to enhance combustion and heat exchange characteristics, greatly enhance the heat transfer effect. The high-quality heat of the combustion chamber is first used to heat the peripheral reforming reaction, and the remaining heat is further used to preheat methane and vaporize water, realizing cascade utilization of energy and maximizing system efficiency.

All documents mentioned in this application are incorporated by reference in this application as if each were individually incorporated by reference. In addition, it should be understood that after reading the above teaching content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims (11)

1. A reforming reaction device for cascade utilization of combustion energy for a solid oxide fuel cell system, said device comprising a gas-air premixer, a combustion chamber and a reforming chamber positioned at the periphery of the combustion chamber, characterized in that it also includes : pre-reforming flue gas radiation chamber and pre-reforming chamber; Wherein, the combustion chamber communicates with the gas-air premixer; The pre-reformed flue gas radiating chamber communicates with the combustion chamber; The pre-reforming chamber is located on the periphery of the pre-reforming flue gas radiation chamber, and the pre-reforming chamber communicates with the reforming chamber; and The device also includes a water-methane premixer and a vaporization preheating chamber. 2. The reforming reaction device according to claim 1, characterized in that, said reforming chamber is provided with a gas collecting plate. 3. The reforming reaction device as claimed in claim 1, characterized in that, said device also has one or more of the following features: The combustion chamber is located above the gas-air premixer; The pre-reformed flue gas radiation chamber is located above the combustion chamber; and/or The pre-reforming chamber is located above the reforming chamber. 4. The reforming reaction device according to claim 1, wherein the combustion chamber further comprises a filled porous medium body. 5. The reforming reaction device according to claim 1, characterized in that, said pre-reforming chamber and reforming chamber are provided with splitter fins. 6. The reforming reaction device as claimed in claim 5, wherein said pre-reforming chamber is also provided with a gas distribution plate, and said gas distribution plate is used to collect said water-methane premixer and the mixed gas flows into the pre-reforming chamber along the splitter fins. 7. The reforming reaction device according to claim 1, wherein the water-methane pre-mixer comprises a water input pipe, a methane input pipe and a vaporization preheating pipe. 8. The reforming reaction device according to claim 7, characterized in that, the water-methane premixer is also provided with a preheating buffer chamber. 9. The reforming reaction device according to claim 8, wherein the pipe diameters of the vaporization preheating pipes are the same or different. 10. The reforming reaction device according to claim 1, wherein the gas-air premixer comprises a gas input pipe, an air input pipe and a gas-air premix chamber. 11. A fuel power generation system, characterized in that it has a reforming reaction device, a fuel cell, an air compressor, a water separator, a water tank, and a metering unit for the solid oxide fuel cell system as claimed in claim 1. Pump, valve control and temperature control device.