Natural gas engine reforming hydrogen production device

Abstract

The invention belongs to a natural gas engine reforming hydrogen production device in the technical field of natural gas reforming hydrogen production. An exhaust pipeline of a natural gas engine is communicated with a circulation pipeline (22) and a reformer shell (14a) of a natural gas reformer (14), a heat exchange pipe (14b) is arranged in the reformer shell (14a), the circulation pipeline (22) is communicated with a natural gas cylinder (01) and a second mixer (12), the second mixer (12) is communicated with one end of the heat exchange pipe (14b), the other end of the heat exchange pipe (14b) is communicated with a first mixer (06), and the first mixer (06) is communicated with a second mixer (07). And the first mixer (06) is communicated with a natural gas cylinder (01) and a natural gas engine. According to the natural gas engine reforming hydrogen production device, energy recycling can be conducted on high-temperature exhaust gas of the natural gas engine, resource waste is avoided, and meanwhile the natural gas reforming hydrogen production effect is optimized, so that the tail gas temperature can be reduced, clean energy hydrogen can be generated, and the dual requirements for energy transformation and environmental protection are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas reforming for hydrogen production, and more specifically, relates to a natural gas engine reforming hydrogen production device. Background Art

[0002] As a relatively clean fossil energy, natural gas plays an important role in the transitional stage of energy transformation. Due to its relatively clean combustion characteristics, natural gas engines have been widely used in fields such as transportation and power generation. However, when traditional natural gas engines operate, the high-temperature exhaust gas generated by fuel combustion is directly discharged, resulting in a large amount of heat loss, making it difficult to improve the overall thermal efficiency of the engine. Therefore, how to effectively utilize this part of heat energy and reduce the exhaust gas temperature has become a key issue in improving the performance of natural gas engines. Natural gas reforming for hydrogen production mainly uses the main component methane in natural gas to react with other substances to produce hydrogen. Since the source of natural gas is very wide, it can be obtained from various gas sources such as natural gas, coalbed methane, and biogas, and the methane molecule has a high content of hydrogen atoms, which makes this technology widely used. Among them, the natural gas steam reforming for hydrogen production technology uses methane (CH 4 ) and steam (H 2 O) as the main raw materials to generate carbon monoxide (CO) and hydrogen (H 2 ) under high temperature and the action of a suitable catalyst. The main reaction equation is: However, as a strongly endothermic reaction, natural gas steam reforming for hydrogen production not only requires catalysts such as nickel-based catalysts, but also needs to externally provide a stable high-temperature heat source to promote the forward reaction to achieve efficient hydrogen production. In order to improve the thermal efficiency of natural gas engines and reduce the exhaust gas temperature, an effective technical path is to realize the heat energy recovery and effective utilization of natural gas engines through natural gas reforming for hydrogen production technology, that is, to use the heat of high-temperature exhaust gas for reforming hydrogen production, which can not only reduce the exhaust gas temperature but also produce clean energy hydrogen, meeting the dual requirements of energy transformation and environmental protection policies.

[0003] The disadvantages of the prior art are as follows: The combustion speed of natural gas is relatively fast. This rapid combustion process may cause the temperature in the exhaust system to rise rapidly, and a large amount of heat is directly discharged with the exhaust gas. This part of the heat can account for 30% - 40% of the total energy of the fuel. Under the prior art, this part of the energy is not effectively utilized, resulting in a great waste of exhaust heat. Chinese Patent Publication No. CN 207935007 U discloses a waste heat recovery system for a series-type natural gas generator set. The flue gas generated by this system exchanges heat with the coolant to reduce the exhaust temperature. The coolant then exchanges heat with the external circulating water for cooling and recycling. Although this method can effectively reduce the exhaust temperature, the method of using the coolant and the external circulating water as media for heat exchange has a lower heat exchange efficiency and higher heat loss for the overall system compared to directly using a tubular heat exchanger. However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: In view of the deficiencies of the prior art, to provide a natural gas engine reforming and hydrogen production device that can recycle the energy of the high-temperature exhaust gas of a natural gas engine, avoid waste of resources, and at the same time optimize the effect of natural gas reforming for hydrogen production, so as to not only reduce the tail gas temperature but also produce clean energy hydrogen, meeting the dual requirements of energy transformation and environmental protection.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] The present invention is a natural gas engine reforming and hydrogen production device. The exhaust pipe of the natural gas engine is connected to a circulation pipe and the reformer housing of a natural gas reformer. Heat exchange tubes are arranged inside the reformer housing. The circulation pipe is connected to a natural gas cylinder and a second mixer. One end of the heat exchange tube is connected to the second mixer, and the other end of the heat exchange tube is connected to a first mixer. The first mixer is connected to the natural gas cylinder and the natural gas engine.

[0007] The natural gas engine is an internal combustion engine or a gas turbine.

[0008] The natural gas cylinder is connected to a natural gas pipeline. The natural gas pipeline is connected to the first mixer. The natural gas pipeline is also connected to the circulation pipe. The first mixer is connected to the internal combustion engine through a pipeline.

[0009] The natural gas cylinder is connected to a natural gas pipeline. The natural gas pipeline is connected to the first mixer. The natural gas pipeline is also connected to the circulation pipe. The first mixer is connected to the gas turbine through a pipeline.

[0010] A first ejector is arranged on the natural gas pipeline connected to the first mixer. The natural gas pipeline connected to the first mixer is also connected to an air filter. A throttle valve is arranged between the natural gas pipeline and the air filter.

[0011] A three-way valve is arranged at the exhaust pipe position of the natural gas engine. The first passage of the three-way valve is communicated with the exhaust pipe, the second passage of the three-way valve is communicated with the circulation pipe, and the third passage of the three-way valve is communicated with the reformer housing.

[0012] The heat exchange tube is a reciprocally bent serpentine pipe. One end of the heat exchange tube extends outside the reformer housing and is communicated with the second mixer through a pipeline. The other end of the heat exchange tube is communicated with the cooler through a pipeline, and the cooler is communicated with the first mixer through a pipeline.

[0013] A flow valve is installed on the circulation pipeline. A fifth temperature sensor and a hydrogen concentration detector are arranged on the pipeline between the cooler and the first mixer. A second injector is arranged on the natural gas pipeline between the second mixer and the natural gas cylinder.

[0014] A first temperature sensor is arranged on the pipeline between the second mixer and the heat exchange tube. A second temperature sensor is arranged on the pipeline between the third passage of the three-way valve and the reformer housing. A third temperature sensor is arranged at the exhaust port. A fourth temperature sensor is arranged on the pipeline between the heat exchange tube and the cooler.

[0015] The gas turbine includes a compressor, a combustion chamber and a turbine. The compressor and the turbine are respectively communicated with the combustion chamber. The compressor is communicated with the air filter. The first mixer is communicated with the combustion chamber. The exhaust pipe of the turbine is communicated with the three-way valve.

[0016] Adopting the technical solution of the present invention, the working principle and beneficial effects are as follows:

[0017] The hydrogen production device by reforming natural gas in the natural gas engine described in the present invention can not only effectively optimize the heating and water supply structures of the hydrogen production device by reforming natural gas in the natural gas engine, but also recycle the energy of the high-temperature exhaust gas of the natural gas engine. Since the exhaust gas of a natural gas engine (internal combustion engine or gas turbine) usually has a relatively high temperature, due to the difference in engine operating conditions, the exhaust gas temperature generally remains in the range of 500-700 °C, which can fully meet the heating reaction conditions for natural gas reforming to produce hydrogen, thus giving rise to a high-temperature exhaust gas heating method. In this reaction system, natural gas burns fully in the natural gas engine. A part of the generated high-temperature exhaust gas provides the required steam raw material for the reforming reaction, and the other part can provide the required high-temperature environment for the natural gas steam reforming reaction through the heat exchange tubes. This method of using high-temperature exhaust gas for heating has many advantages. Compared with the traditional external heating method, it does not require a large amount of external heat input, reduces the dependence on external heat source equipment, lowers the equipment cost and floor area, and avoids the loss of a large amount of heat during the transfer process, significantly improving the energy utilization efficiency. At the same time, the reaction startup speed is relatively fast, and the reaction temperature can be reached within a short time, improving the production efficiency. In addition, the internal heat generated by high-temperature exhaust gas heating can maintain the high-temperature state of steam in the reaction system. During the reaction process, the steam in the high-temperature exhaust gas continuously participates in the reforming reaction, without the need to supplement steam, realizing the efficient recycling of steam in the reaction system and further reducing the heat required for the reaction. Finally, hydrogen, as a fuel with a high energy density, can re-participate in the combustion process, improving the combustion efficiency of the engine and thus enhancing the thermal efficiency. Brief Description of the Drawings

[0018] The following briefly describes the content expressed by each drawing in this specification and the marks in the drawings:

[0019] Figure 1 It is a schematic structural diagram of Embodiment 1 of the hydrogen production device by reforming natural gas in the natural gas engine described in the present invention;

[0020] Figure 2 It is a schematic structural diagram of Embodiment 2 of the hydrogen production device by reforming natural gas in the natural gas engine described in the present invention;

[0021] The labels in the attached drawings are respectively: 01, natural gas cylinder; 02, pressure reducing valve; 03, first injector; 04, air filter; 05, throttle valve; 06, mixer; 07, internal combustion engine; 08, three-way valve; 09, flow valve; 10, high-temperature flowmeter; 11, second injector; 12, mixer; 13, first temperature sensor; 14, natural gas reformer; 14a, reformer housing; 14b, heat exchange tube; 15, second temperature sensor; 16, third temperature sensor; 17, exhaust port; 18, fourth temperature sensor; 19, cooler; 20, fifth temperature sensor; 21, hydrogen concentration detector; 22, circulation pipeline; 23, natural gas pipeline; 24, gas turbine; 24a, compressor; 24b, combustion chamber; 24c, turbine. Detailed implementation manners

[0022] The following is a further detailed description of the specific implementation manners of the present invention, such as the shapes, structures of the various components involved, the mutual positions and connection relationships between the various parts, the functions and working principles of the various parts, etc., with reference to the attached drawings:

[0023] As shown in the attached Figure 1 drawing, drawing Figure 2As shown in the figure, the present invention is a hydrogen production device for reforming natural gas in a natural gas engine. The exhaust pipe of the natural gas engine is connected to the circulation pipeline 22 and the reformer housing 14a of the natural gas reformer 14. Inside the reformer housing 14a, there are heat exchange tubes 14b. The circulation pipeline 22 is connected to the natural gas cylinder 01 and the second mixer 12. The second mixer 12 is connected to one end of the heat exchange tube 14b. The other end of the heat exchange tube 14b is connected to the first mixer 06. The first mixer 06 is connected to the natural gas cylinder 01 and the natural gas engine. For the deficiencies in the prior art, the above structure innovatively proposes a hydrogen production device that uses high-temperature exhaust gas to provide heat source and water source for natural gas reforming to produce hydrogen. This device can not only effectively optimize the heating and water supply structures of the natural gas engine reforming hydrogen production device, but also recycle the energy of the high-temperature exhaust gas of the natural gas engine. Since the exhaust gas of a natural gas engine (internal combustion engine 07 or gas turbine 24) usually has a relatively high temperature, due to the difference in engine operating conditions, the exhaust gas temperature generally remains in the range of 500-700 °C, which can fully meet the heating reaction conditions for natural gas reforming to produce hydrogen, thus giving rise to a high-temperature exhaust gas heating method. In this reaction system, natural gas burns fully in the natural gas engine. A part of the generated high-temperature exhaust gas provides the required water vapor raw material for the reforming reaction, and the other part can provide the required high-temperature environment for the natural gas steam reforming reaction through the heat exchange tubes. This method of using high-temperature exhaust gas for heating has many advantages. Compared with the traditional external heating method, it does not require a large amount of external heat input, reduces the dependence on external heat source equipment, lowers the equipment cost and floor area, and avoids the loss of a large amount of heat during the heat transfer process, significantly improving the energy utilization efficiency. At the same time, the reaction starts relatively quickly and can reach the required reaction temperature in a short time, improving the production efficiency. In addition, the internal heat generated by high-temperature exhaust gas heating can maintain the high-temperature state of water vapor in the reaction system. During the reaction process, the water vapor in the high-temperature exhaust gas continuously participates in the reforming reaction without the need to supplement water vapor, thus realizing the efficient recycling of water vapor in the reaction system and further reducing the heat required for the reaction. Finally, hydrogen, as a fuel with a high energy density, can re-participate in the combustion process, improving the combustion efficiency of the engine and thus enhancing the thermal efficiency. The natural gas engine reforming hydrogen production device described in the present invention can recycle the energy of the high-temperature exhaust gas of the natural gas engine, avoid resource waste, and optimize the natural gas reforming hydrogen production effect, so as to not only reduce the exhaust gas temperature but also produce clean energy hydrogen, meeting the dual requirements of energy transformation and environmental protection.

[0024] The natural gas engine described above is an internal combustion engine 07 or a gas turbine 24. The internal combustion engine 07 is used in Embodiment 1 of the present invention, and the gas turbine 24 is used in Embodiment 2 of the present invention.

[0025] In Embodiment 1, the natural gas cylinder 01 is connected to the natural gas pipeline 23, the natural gas pipeline 23 is connected to the first mixer 06, and the first mixer 06 is connected to the internal combustion engine 07 through a pipeline. A first injector 03 is provided on the natural gas pipeline 23 connected to the first mixer 06. The natural gas pipeline 23 connected to the first mixer 06 is simultaneously connected to the air filter 04, and a throttle valve 05 is provided between the natural gas pipeline 23 and the air filter 04. A three-way valve 08 is provided at the exhaust pipe position of the natural gas engine. The first passage of the three-way valve 08 is connected to the exhaust pipe, the second passage of the three-way valve 08 is connected to the flow-through pipeline 22, and the third passage of the three-way valve 08 is connected to the reformer housing 14a. The heat exchange tube 14b is a reciprocally bent serpentine pipe. One end of the heat exchange tube 14b is connected to the exhaust port 17, and the other end of the heat exchange tube 14b extends outside the reformer housing 14a and is connected to the second mixer 12 through a pipeline. The other end of the heat exchange tube 14b is connected to the cooler 19 through a pipeline, and the cooler 19 is connected to the first mixer 06 through a pipeline. A flow valve 09 is installed on the flow-through pipeline 22, a fifth temperature sensor 20 and a hydrogen concentration detector 21 are provided on the pipeline between the cooler 19 and the first mixer 06, and a second injector 11 is provided on the natural gas pipeline 23 between the second mixer 12 and the natural gas cylinder 01. A first temperature sensor 13 is provided on the pipeline between the second mixer 12 and the heat exchange tube 14b, a second temperature sensor 15 is provided on the pipeline between the third passage of the three-way valve 08 and the reformer housing 14a, a third temperature sensor 18 is provided on the exhaust port 17, and a fourth temperature sensor 18 is provided on the pipeline between the heat exchange tube 14b and the cooler 19.

[0026] The main components of the natural gas internal combustion engine reforming hydrogen production device in Embodiment 1 include:

[0027] The first injector 03: Controls the natural gas injection amount and injection timing according to the operating conditions of the internal combustion engine.

[0028] The air filter 04: Removes particulate impurities in the air and purifies the intake air of the internal combustion engine.

[0029] The throttle valve 05: Adjusts the intake air volume of the internal combustion engine and optimizes the air-fuel ratio.

[0030] The internal combustion engine 07: Burns fuels such as natural gas and hydrogen, converts heat energy into mechanical energy, and discharges high-temperature exhaust gas.

[0031] The flow valve 09: Controls the high-temperature exhaust gas flow according to the amount of water vapor required for the reforming reaction.

[0032] The second mixer 12: Performs gas / gas mixing of the high-temperature exhaust gas containing water vapor and natural gas through internal turbulence plates.

[0033] The natural gas reformer 14: Provides a reaction site for natural gas reforming to produce hydrogen.

[0034] Reformer housing 14a: Uses high-temperature exhaust gas to provide a high-temperature heat source for the reforming hydrogen production reaction.

[0035] Heat exchange tube 14b: Provides a large heat exchange area to transfer reaction heat for the reforming reaction.

[0036] The principle of the natural gas internal combustion engine reforming hydrogen production device in Example 1 is specifically as Figure 1 shown:

[0037] The natural gas required for the hydrogen production device is provided by a high-pressure natural gas cylinder 01. After the natural gas passes through a pressure reducing valve 02 to reduce the air pressure, it provides raw materials for the internal combustion engine 07 and the natural gas reformer 14 respectively. Before the internal combustion engine 07 burns, the natural gas enters the first injector 03 from the pressure reducing valve 02, mixes with the air whose intake is controlled by the air filter 04 and the throttle valve 05 in the first mixer 06, and then enters the internal combustion engine 07 for combustion. After combustion, the high-temperature exhaust gas containing water vapor in the internal combustion engine 07 enters the natural gas reformer housing 14a and the flow valve 09 respectively through the three-way valve 08. The high-temperature exhaust gas can fully exchange heat with the heat exchange tube 14b inside the natural gas reformer housing 14a to provide the heat required for the reforming hydrogen production reaction, and is discharged from the exhaust port 17 of the natural gas reformer housing 14a after heat exchange. The flow valve 09 can effectively control the flow rate of the high-temperature exhaust gas according to the amount of water vapor required for the reforming reaction. The high-temperature exhaust gas and the natural gas supplied from the natural gas pipeline through the second injector 11 are fully mixed inside the second mixer 12, and finally enter the natural gas reformer 14 for endothermic reforming reaction. In the reforming reaction, the high-temperature exhaust gas containing water vapor and natural gas are used as raw materials for the reforming reaction. After being heated by the high-temperature exhaust gas in the reformer housing 14a and catalyzed by the catalyst inside the heat exchange tube 14b, the natural gas reforming hydrogen production reaction is fully carried out, and hydrogen with a high calorific value is prepared. After the reforming reaction, the reformed gas mixed with high-calorific value hydrogen enters the cooler 19 for cooling, and after passing through the hydrogen concentration detector 21, it is mixed with natural gas and air in the first mixer 06 and then enters the internal combustion engine 07 for combustion. The high-calorific value hydrogen can effectively improve the combustion efficiency of the internal combustion engine 07.

[0038] The inside of the natural gas reformer 14 is composed of a reformer housing 14a and a reaction area of 14b. The reaction area is designed as a structure such as a heat exchange tube or a hollow heat exchange plate that is conducive to heat exchange with the external heat shell.

[0039] In Embodiment 2, the natural gas cylinder 01 is connected to the natural gas pipeline 23, the natural gas pipeline 23 is connected to the first mixer 06, and the first mixer 06 is connected to the gas turbine 24 through a pipeline. A first ejector 03 is provided on the natural gas pipeline 23 connected to the first mixer 06. The compressor 24a and the turbine 24c are respectively connected to the combustion chamber 24b. The compressor 24a is connected to the air filter 04. The first mixer 06 is connected to the combustion chamber 24b. The exhaust pipeline of the turbine 24c is connected to the three-way valve 08. The first passage of the three-way valve 08 is connected to the exhaust pipeline, the second passage of the three-way valve 08 is connected to the flow pipeline 22, and the third passage of the three-way valve 08 is connected to the reformer housing 14a. The heat exchange tube 14b is a reciprocally bent serpentine pipe. One end of the heat exchange tube 14b extends outside the reformer housing 14a and is connected to the second mixer 12 through a pipeline, and the other end of the heat exchange tube 14b is connected to the cooler 19 through a pipeline. The cooler 19 is connected to the first mixer 06 through a pipeline. A flow valve 09 is installed on the flow pipeline 22. A fifth temperature sensor 20 and a hydrogen concentration detector 21 are provided on the pipeline between the cooler 19 and the first mixer 06. A second ejector 11 is provided on the natural gas pipeline 23 between the second mixer 12 and the natural gas cylinder 01. A first temperature sensor 13 is provided on the pipeline between the second mixer 12 and the heat exchange tube 14b. A second temperature sensor 15 is provided on the pipeline between the third passage of the three-way valve 08 and the reformer housing 14a. A third temperature sensor 18 is provided at the exhaust port 17. A fourth temperature sensor 18 is provided on the pipeline between the heat exchange tube 14b and the cooler 19.

[0040] The main components of the natural gas gas turbine reforming hydrogen production device in Embodiment 2 include:

[0041] Ejector 03: Control the natural gas injection amount and injection time according to the gas turbine operating conditions.

[0042] Compressor 24a: Increase the air pressure to fully mix and efficiently burn with natural gas in the combustion chamber; control the intake air volume to optimize the gas turbine operating parameters.

[0043] Combustion chamber 24b: Fully mix and burn natural gas and hydrogen with air, and convert the chemical energy of the fuel into heat energy.

[0044] Turbine 24c: Use the high-temperature and high-pressure gas generated by fuel combustion to drive the turbine to rotate, and convert the heat energy of natural gas and hydrogen into mechanical energy.

[0045] Air filter 04: Remove particulate impurities in the air in the gas turbine equipment.

[0046] The principle of the natural gas gas turbine reforming hydrogen production device in Embodiment 2 is specifically as Figure 2 shown:

[0047] The natural gas required by the hydrogen production device is provided by the natural gas cylinder 01. After the pressure of the natural gas is reduced by the pressure reducing valve 02, it provides raw materials for the gas turbine 24 and the natural gas reformer 14 respectively. Before entering the gas turbine 24 for combustion, the natural gas passes through the pressure reducing valve 02 and enters the first injector 03, and is fully mixed and burned with the high-pressure air passing through the air filter 04 and the compressor 24a inside the combustion chamber 24b, driving the turbine 24c to do work. The high-temperature exhaust gas containing water vapor is discharged through the blades of the turbine 24c, and enters the reformer housing 14a and the flow valve 09 respectively through the three-way valve 08. The high-temperature exhaust gas can fully exchange heat with the heat exchange tubes 14b inside the natural gas reformer housing 14a, providing the heat required for the reforming hydrogen production reaction. After heat exchange, it is discharged from the exhaust port 17 of the hot shell 14a of the natural gas reformer. The flow valve 09 can effectively control the flow rate of the high-temperature exhaust gas according to the amount of water vapor required for the reforming reaction. The high-temperature exhaust gas is fully mixed with the natural gas supplied by the second injector 11 inside the second mixer 12, and enters the inside of the heat exchange tubes 14b of the natural gas reformer for endothermic reforming reaction. In the reforming reaction, the high-temperature exhaust gas containing water vapor and natural gas are used as raw materials for the reforming reaction. After being heated by the high-temperature exhaust gas in the reformer hot shell 14a and catalyzed by the catalyst inside the heat exchange tubes 14b, the natural gas reforming hydrogen production reaction is fully carried out, and high-calorific hydrogen is prepared. After the reforming reaction, the reformed gas mixed with high-calorific hydrogen enters the cooler 19 for cooling, and after being detected by the hydrogen concentration detector 21, it enters the combustion chamber for combustion with natural gas through the first mixer 06. The high-calorific hydrogen can effectively improve the combustion efficiency of the gas turbine.

[0048] The hydrogen production device by reforming natural gas of the present invention is divided into Embodiment 1 and Embodiment 2. Embodiment 1 is a hydrogen production device by reforming natural gas in an internal combustion engine, and Embodiment 2 is a hydrogen production device by reforming natural gas in a gas turbine. The difference between Embodiment 1 and Embodiment 2 lies in the setting of the internal combustion engine or the gas turbine. Through the structure of the present invention, not only can the heating and water supply structures of the hydrogen production device by reforming natural gas in a natural gas engine be effectively optimized, but also the high-temperature exhaust gas of the natural gas engine can be recycled for energy. Because the exhaust gas of a natural gas engine (internal combustion engine 07 or gas turbine 24) usually has a relatively high temperature, due to the difference in engine operating conditions, the exhaust gas temperature generally remains in the range of 500 - 700 °C, and this temperature can fully meet the heating reaction conditions for natural gas reforming to produce hydrogen, thus giving rise to a high-temperature exhaust gas heating method. In this reaction system, natural gas burns fully in the natural gas engine. A part of the generated high-temperature exhaust gas provides the required water vapor raw material for the reforming reaction, and the other part can provide the required high-temperature environment for the natural gas steam reforming reaction through the heat exchange tubes. This device and method using high-temperature exhaust gas heating have many advantages. Compared with the traditional external heating method, it does not require a large amount of external heat input, reduces the dependence on external heat source equipment, lowers the equipment cost and floor area, and avoids a large amount of heat loss during heat transfer, significantly improving the energy utilization efficiency. At the same time, the reaction startup speed is relatively fast, and the reaction temperature can be reached in a relatively short time, improving the production efficiency. In addition, the internal heat generated by high-temperature exhaust gas heating can maintain the high-temperature state of water vapor in the reaction system. During the reaction process, the water vapor in the high-temperature exhaust gas continuously participates in the reforming reaction, and there is no need to supplement water vapor, realizing the efficient recycling of water vapor in the reaction system and further reducing the heat required for the reaction. Finally, hydrogen, as a fuel with a high energy density, can re-participate in the combustion process, improving the combustion efficiency of the engine and thus enhancing the thermal efficiency.

[0049] The present invention has been described exemplarily above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A natural gas engine reforming hydrogen production device, characterized in that: The exhaust pipeline of the natural gas engine is connected to the circulation pipeline (22) and the reformer shell (14a) of the natural gas reformer (14); a heat exchange pipe (14b) is arranged inside the reformer shell (14a); the circulation pipeline (22) is connected to the natural gas cylinder (01) and the second mixer (12); the second mixer (12) is connected to one end of the heat exchange pipe (14b); the other end of the heat exchange pipe (14b) is connected to the first mixer (06); the first mixer (06) is connected to the natural gas cylinder (01) and the natural gas engine.

2. The natural gas engine reforming hydrogen production device according to claim 1, characterized in that: The natural gas engine is an internal combustion engine (07) or a gas turbine (24).

3. The natural gas engine reforming hydrogen production device according to claim 2 is characterized in that: The natural gas cylinder (01) is connected to a natural gas pipeline (23), the natural gas pipeline (23) is connected to a first mixer (06), the natural gas pipeline (23) is simultaneously connected to a circulation pipeline (22), and the first mixer (06) is connected to an internal combustion engine (07) via a pipeline.

4. The natural gas engine reforming hydrogen production device according to claim 2, characterized in that: The natural gas cylinder (01) is connected to the natural gas pipeline (23), the natural gas pipeline (23) is connected to the first mixer (06), the natural gas pipeline (23) is also connected to the circulation pipeline (22), and the first mixer (06) is connected to the gas turbine (24) through the pipeline.

5. The natural gas engine reforming hydrogen production device according to claim 3 or 4, characterized in that: A first injector (03) is arranged on the natural gas pipeline (23) connected to the first mixer (06), the natural gas pipeline (23) connected to the first mixer (06) is also connected to the air filter (04), and a throttle valve (05) is arranged between the natural gas pipeline (23) and the air filter (04).

6. The natural gas engine reforming hydrogen production device according to claim 3 or 4, characterized in that: A three-way valve (08) is arranged at the exhaust pipeline of the natural gas engine, a first passage of the three-way valve (08) is connected to the exhaust pipeline, a second passage of the three-way valve (08) is connected to the flow pipeline (22), and a third passage of the three-way valve (08) is connected to the reformer shell (14a).

7. The natural gas engine reforming hydrogen production device according to claim 3 or 4, characterized in that: The heat exchange tube (14b) is a reciprocatingly bent serpentine pipe, one end of the heat exchange tube (14b) is connected to the exhaust port (17), the other end of the heat exchange tube (14b) extends to the outside of the reformer shell (14a) and is connected to the second mixer (12) through a pipeline, the other end of the heat exchange tube (14b) is connected to the cooler (19) through a pipeline, and the cooler (19) is connected to the first mixer (06) through a pipeline.

8. The natural gas engine reforming hydrogen production device according to claim 3 or 4, characterized in that: A flow valve (09) is installed on the circulation pipeline (22), a fifth temperature sensor (20) and a hydrogen concentration detector (21) are arranged on the pipeline between the cooler (19) and the first mixer (06), and a second injector (11) is arranged on the natural gas pipeline (23) between the second mixer (12) and the natural gas cylinder (01).

9. The natural gas engine reforming hydrogen production device according to claim 3 or 4, characterized in that: A first temperature sensor (13) is arranged on the pipeline between the second mixer (12) and the heat exchange tube (14b), a second temperature sensor (15) is arranged on the pipeline between the third passage of the three-way valve (08) and the reformer shell (14a), a third temperature sensor (18) is arranged on the exhaust port (17), and a fourth temperature sensor (18) is arranged on the pipeline between the heat exchange tube (14b) and the cooler (19).

10. The natural gas engine reforming hydrogen production device according to claim 2 or 4, characterized in that: The gas turbine (24) comprises a compressor (24a), a combustion chamber (24b) and a turbine (24c); the compressor (24a) and the turbine (24c) are respectively connected to the combustion chamber (24b); the compressor (24a) is connected to the air filter (04); the first mixer (06) is connected to the combustion chamber (24b); and the exhaust pipeline of the turbine (24c) is connected to the three-way valve (08).

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