Reforming-based hydrogen production device for natural gas engine

Abstract

A reforming-based hydrogen production device for a natural gas engine. An exhaust pipe of the natural gas engine is in communication with a circulation pipe (22) and a reformer housing (14a) of a natural gas reformer (14), a heat exchange tube (14b) is provided inside the reformer housing (14a), the circulation pipe (22) is in communication with a natural gas cylinder (01) and a second mixer (12), the second mixer (12) is in communication with one end of the heat exchange tube (14b), the other end of the heat exchange tube (14b) is in communication with a first mixer (06), and the first mixer (06) is in communication with the natural gas cylinder (01) and the natural gas engine. The reforming-based hydrogen production device for a natural gas engine can recover and reuse energy from high-temperature exhaust gas of the natural gas engine, while optimizing the hydrogen production efficiency of natural gas reforming, lowering exhaust gas temperature, and producing clean-energy hydrogen, thereby meeting both energy-transition and environmental-protection requirements.

Description

A natural gas engine reforming hydrogen production device Technical Field

[0001] This invention belongs to the field of natural gas reforming hydrogen production technology, and more specifically, relates to a natural gas engine reforming hydrogen production device. Background Technology

[0002] Natural gas, as a relatively clean fossil fuel, plays a crucial role in the transitional phase of energy transformation. Natural gas engines, due to their relatively clean combustion characteristics, are widely used in transportation, power generation, and other fields. However, during operation, traditional natural gas engines directly discharge the high-temperature exhaust gases produced by fuel combustion, resulting in significant heat loss and hindering the improvement of overall engine thermal efficiency. Therefore, effectively utilizing this heat energy and reducing exhaust temperature has become a key issue in improving the performance of natural gas engines. Natural gas reforming for hydrogen production primarily utilizes the reaction of methane, the main component of natural gas, with other substances to produce hydrogen. Because natural gas is widely available, obtained from various gas sources such as natural gas, coalbed methane, and biogas, and because methane has a high hydrogen atom content in its molecular formula, this technology is widely used. Among these, natural gas steam reforming for hydrogen production uses methane (CH4) and steam (H2O) as the main raw materials to produce carbon monoxide (CO) and hydrogen (H2) under high temperature and with a suitable catalyst. Its main reaction equation is: However, natural gas steam reforming for hydrogen production is a strongly endothermic reaction, requiring not only nickel-based catalysts but also a stable, high-temperature external heat source to ensure the reaction proceeds in the forward direction and achieve efficient hydrogen production. To improve the thermal efficiency of natural gas engines and reduce exhaust temperature, an effective technological approach is to recover and effectively utilize the heat energy of natural gas engines through natural gas reforming for hydrogen production. This involves using the heat from the high-temperature exhaust gas for reforming to produce hydrogen, which both reduces exhaust gas temperature and generates clean energy hydrogen, meeting the dual requirements of energy transition and environmental policies.

[0003] The drawback of existing technologies is that natural gas burns relatively quickly, which can cause the temperature in the exhaust system to rise rapidly. A large amount of heat is directly discharged with the exhaust gas, accounting for 30% to 40% of the total fuel energy. Under existing technologies, this energy is not effectively utilized, resulting in a significant waste of exhaust heat. Chinese Patent Publication No. CN 207935007 U discloses a series-connected natural gas generator waste heat recovery system. In this system, the flue gas generates heat through heat exchange with coolant, reducing the exhaust temperature. The coolant then exchanges heat with external circulating water for further cooling and is recycled. While this method effectively reduces the exhaust temperature, using coolant and external circulating water as heat exchange media results in lower overall system heat exchange efficiency and higher heat loss compared to directly using a tubular heat exchanger. However, this technology does not address the technical problems and solutions of this application. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a natural gas engine reforming hydrogen production device that can reuse the high-temperature exhaust gas of natural gas engines to avoid resource waste, while optimizing the hydrogen production effect of natural gas reforming, thereby reducing the exhaust gas temperature and producing clean energy hydrogen, which meets the dual requirements of energy transition and environmental protection.

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

[0006] This invention relates to a hydrogen production device for reforming a natural gas engine. The exhaust pipe of the natural gas engine is connected to a flow pipe and the reformer shell of the natural gas reformer. A heat exchange tube is installed inside the reformer shell. The flow pipe is connected to a natural gas cylinder and a second mixer. The second mixer is connected to one end of the heat exchange tube, 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 either an internal combustion engine or a gas turbine.

[0008] The natural gas cylinder is connected to a natural gas pipeline, which is connected to a first mixer. The natural gas pipeline is also connected to a flow pipeline, and the first mixer is connected to an internal combustion engine through a pipeline.

[0009] The natural gas cylinder is connected to a natural gas pipeline, which is connected to a first mixer. The natural gas pipeline is also connected to a flow pipeline, and the first mixer is connected to a gas turbine through a pipeline.

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

[0011] A three-way valve is installed at the exhaust pipe position of the natural gas engine. The first passage of the three-way valve is connected to the exhaust pipe, the second passage of the three-way valve is connected to the flow pipe, and the third passage of the three-way valve is connected to the reformer housing.

[0012] The heat exchange tube is a serpentine pipe that bends back and forth. One end of the heat exchange tube extends to the outside of the reformer shell and is connected to the second mixer through a pipeline. The other end of the heat exchange tube is connected to the cooler through a pipeline, and the cooler is connected to 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 installed on the pipeline between the cooler and the first mixer, and a second injector is installed on the natural gas pipeline between the second mixer and the natural gas cylinder.

[0014] A first temperature sensor is installed on the pipeline between the second mixer and the heat exchange tube, a second temperature sensor is installed on the pipeline between the third passage of the three-way valve and the reformer housing, a third temperature sensor is installed on the exhaust port, and a fourth temperature sensor is installed 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 turbine are connected to the combustion chamber, the compressor is connected to an air filter, the first mixer is connected to the combustion chamber, and the exhaust pipe of the turbine is connected to a three-way valve.

[0016] The working principle and beneficial effects of the technical solution adopted in this invention are as follows:

[0017] The natural gas engine reforming hydrogen production device described in this invention not only effectively optimizes the heating and water supply structure of the natural gas engine reforming hydrogen production device, but also enables energy reuse of the high-temperature exhaust gas from the natural gas engine. Because the exhaust gas from natural gas engines (internal combustion engines or gas turbines) typically has a high temperature, generally maintained in the range of 500–700°C due to differences in engine operating conditions, this temperature fully meets the heating reaction conditions for natural gas reforming hydrogen production, thus giving rise to a high-temperature exhaust gas heating method. In this reaction system, natural gas undergoes complete combustion within the natural gas engine, and part of the generated high-temperature exhaust gas provides the required steam feedstock for the reforming reaction, while the other part can provide the required high-temperature environment for the natural gas steam reforming reaction through heat exchange tubes. This method of heating using high-temperature exhaust gas offers numerous advantages. Compared to traditional external heating methods, it eliminates the need for large external heat inputs, reducing reliance on external heat sources, lowering equipment costs and floor space requirements, and avoiding significant heat loss during transfer, thus significantly improving energy efficiency. Simultaneously, the reaction starts up relatively quickly, reaching the required temperature in a short time, improving production efficiency. Furthermore, the internal heat generated by the high-temperature exhaust gas heating maintains the high-temperature state of water vapor within the reaction system. During the reaction, the water vapor in the high-temperature exhaust continuously participates in the reforming reaction, eliminating the need for additional water vapor and achieving efficient recycling of water vapor within the reaction system, further reducing the heat required for the reaction. Finally, hydrogen, as a high-energy-density fuel, can re-participate in the combustion process, improving engine combustion efficiency and thus enhancing thermal efficiency. Attached Figure Description

[0018] The following is a brief explanation of the contents of the accompanying drawings and the markings in the drawings:

[0019] Figure 1 is a schematic diagram of the structure of Embodiment 1 of the natural gas engine reforming hydrogen production device according to the present invention;

[0020] Figure 2 is a schematic diagram of the structure of Embodiment 2 of the natural gas engine reforming hydrogen production device according to the present invention;

[0021] The labels in the attached diagram are as follows: 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 flow meter; 11, Second injector; 12, Mixer; 13, First temperature sensor; 14, Natural gas reformer; 14a, Reformer housing; 14b, Heat exchanger 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, Flow pipeline; 23, Natural gas pipeline; 24, Gas turbine; 24a, Compressor; 24b, Combustion chamber; 24c, Turbine. Detailed Implementation

[0022] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of the present invention, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part:

[0023] As shown in Figures 1 and 2, this invention is a hydrogen production device for reforming natural gas engines. The exhaust pipe of the natural gas engine is connected to a flow pipe 22 and the reformer housing 14a of the natural gas reformer 14. A heat exchange tube 14b is installed inside the reformer housing 14a. The flow pipe 22 is connected to a natural gas cylinder 01 and a second mixer 12. The second mixer 12 is connected to one end of the heat exchange tube 14b, and the other end of the heat exchange tube 14b is connected to a first mixer 06. The first mixer 06 is connected to the natural gas cylinder 01 and the natural gas engine. This structure, addressing the shortcomings of existing technologies, innovatively proposes a hydrogen production device that utilizes high-temperature exhaust gas to provide a heat source and water source for natural gas reforming hydrogen production. This device not only effectively optimizes the heating and water supply structure of the natural gas engine reforming hydrogen production device but also enables energy reuse from the high-temperature exhaust gas of the natural gas engine. Because the exhaust gas from natural gas engines (internal combustion engine 07 or gas turbine 24) typically has a high temperature, generally maintained in the range of 500–700°C due to differences in engine operating conditions, 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 undergoes complete combustion within the natural gas engine, and part of the generated high-temperature exhaust gas provides the steam feedstock required for the reforming reaction, while the other part can provide the necessary high-temperature environment for the natural gas steam reforming reaction through heat exchange tubes. This method of heating using high-temperature exhaust gas offers numerous advantages. Compared to traditional external heating methods, it eliminates the need for large external heat inputs, reducing reliance on external heat sources, lowering equipment costs and floor space requirements, and avoiding significant heat loss during transfer, thus significantly improving energy utilization efficiency. Simultaneously, the reaction starts relatively quickly, reaching the required temperature in a short time, improving production efficiency. Furthermore, the internal heat generated by the high-temperature exhaust gas heating maintains the high-temperature state of water vapor within the reaction system. During the reaction, water vapor in the high-temperature exhaust continuously participates in the reforming reaction, eliminating the need for additional water vapor and achieving efficient recycling of water vapor within the reaction system, further reducing the heat required for the reaction. Finally, hydrogen, as a high-energy-density fuel, can be reused in the combustion process, improving engine combustion efficiency and thus increasing thermal efficiency. The natural gas engine reforming hydrogen production device described in this invention enables energy reuse from the high-temperature exhaust gas of natural gas engines, avoiding resource waste, while optimizing the natural gas reforming hydrogen production effect. This achieves both reduced exhaust gas temperature and the production of clean energy hydrogen, meeting the dual requirements of energy transition and environmental protection.

[0024] The natural gas engine is either 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, a natural gas cylinder 01 is connected to a natural gas pipeline 23, which in turn connects to a first mixer 06. The first mixer 06 is connected to an internal combustion engine 07 via a pipeline. A first injector 03 is installed on the natural gas pipeline 23 connecting to the first mixer 06. The natural gas pipeline 23 also connects to an air filter 04, and a throttle valve 05 is installed between the natural gas pipeline 23 and the air filter 04. A three-way valve 08 is installed at the exhaust pipe location of the natural gas engine. The first passage of the three-way valve 08 connects to the exhaust pipe, the second passage connects to a flow pipe 22, and the third passage connects to the reformer housing 14a. The heat exchange tube 14b is a serpentine pipe with reciprocating bends. One end of the heat exchange tube 14b is connected to the exhaust port 17, and the other end extends to the outside of the reformer shell 14a and is connected to the second mixer 12 via a pipeline. The other end of the heat exchange tube 14b is connected to the cooler 19 via a pipeline, and the cooler 19 is connected to the first mixer 06 via 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 installed on the pipeline between the cooler 19 and the first mixer 06. A second injector 11 is installed on the natural gas pipeline 23 between the second mixer 12 and the natural gas cylinder 01. A first temperature sensor 13 is installed on the pipeline between the second mixer 12 and the heat exchange tube 14b. A second temperature sensor 15 is installed on the pipeline between the third passage of the three-way valve 08 and the reformer shell 14a. A third temperature sensor 18 is installed on the exhaust port 17. A fourth temperature sensor 18 is installed 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 unit in Example 1 include:

[0027] First injector 03: Controls the amount and timing of natural gas injection based on the operating conditions of the internal combustion engine.

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

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

[0030] Internal combustion engine 07: Burns fuels such as natural gas and hydrogen, converts thermal energy into mechanical energy, and exhausts high-temperature exhaust gas.

[0031] Flow valve 09: Controls the high-temperature exhaust flow rate according to the amount of steam required for the reforming reaction.

[0032] Second mixer 12: Mixes high-temperature exhaust gas containing water vapor with natural gas through an internal baffle.

[0033] Natural Gas Reformer 14: Provides a reaction site for hydrogen production through natural gas reforming.

[0034] Reformer shell 14a: Utilizes 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 unit in Example 1 is shown in Figure 1:

[0037] The natural gas required for the hydrogen production unit is supplied by a high-pressure natural gas cylinder 01. After the natural gas pressure is reduced by a pressure reducing valve 02, it serves as feedstock for the internal combustion engine 07 and the natural gas reformer 14. Before combustion in the internal combustion engine 07, the natural gas enters the first injector 03 through the pressure reducing valve 02, where it mixes with air whose intake volume is controlled by an air filter 04 and a throttle valve 05, and then enters the internal combustion engine 07 for combustion. After combustion, the high-temperature exhaust gas containing water vapor from the internal combustion engine 07 enters the natural gas reformer housing 14a and the flow valve 09 through a three-way valve 08. Inside the natural gas reformer housing 14a, the high-temperature exhaust gas can fully exchange heat with the heat exchange tubes 14b, providing the necessary heat for the reforming hydrogen production reaction. After heat exchange, it is discharged from the exhaust port 17 of the natural gas reformer housing 14a. Flow valve 09 effectively controls the flow rate of 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 natural gas supplied from the natural gas pipeline via the second injector 11 inside the second mixer 12, and finally enters the natural gas reformer 14 for endothermic reforming. In the reforming reaction, the high-temperature exhaust gas containing water vapor and natural gas serve as raw materials for the reforming reaction. After being heated by the high-temperature exhaust gas in the reformer shell 14a and catalyzed by the catalyst inside the heat exchange tube 14b, the natural gas reforming hydrogen production reaction is fully carried out, producing hydrogen with a high calorific value. 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 before entering 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 interior of the natural gas reformer 14 consists of reformer shells 14a and 14b, and reaction zones. The reaction zones are designed with heat exchange tubes or hollow heat exchange plates, which facilitate heat exchange with the external hot shell.

[0039] In Example 2, the natural gas cylinder 01 is connected to a natural gas pipeline 23, which in turn connects to a first mixer 06. The first mixer 06 is connected to a gas turbine 24 via a pipeline. A first injector 03 is installed on the natural gas pipeline 23 connecting to the first mixer 06. Compressor 24a and turbine 24c are respectively connected to combustion chamber 24b. Compressor 24a is connected to an air filter 04, and the first mixer 06 is connected to combustion chamber 24b. The exhaust pipe of turbine 24c is connected to a three-way valve 08. The first passage of the three-way valve 08 is connected to the exhaust pipe, the second passage is connected to a flow pipe 22, and the third passage is connected to the reformer housing 14a. The heat exchange tube 14b is a serpentine pipe with reciprocating bends. One end of the heat exchange tube 14b extends to the outside of the reformer housing 14a and is connected to a second mixer 12 via a pipeline. The other end of the heat exchange tube 14b is connected to a cooler 19 via a pipeline, and the cooler 19 is connected to the first mixer 06 via 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 installed on the pipeline between the cooler 19 and the first mixer 06. A second injector 11 is installed on the natural gas pipeline 23 between the second mixer 12 and the natural gas cylinder 01. A first temperature sensor 13 is installed on the pipeline between the second mixer 12 and the heat exchange tube 14b. A second temperature sensor 15 is installed on the pipeline between the third passage of the three-way valve 08 and the reformer housing 14a. A third temperature sensor 18 is installed on the exhaust port 17. A fourth temperature sensor 18 is installed on the pipeline between the heat exchange tube 14b and the cooler 19.

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

[0041] Injector 03: Controls the amount and timing of natural gas injection based on the operating conditions of the gas turbine.

[0042] Compressor 24a: Increases air pressure to ensure thorough mixing and efficient combustion with natural gas in the combustion chamber; controls air intake and optimizes gas turbine operating parameters.

[0043] Combustion chamber 24b: It thoroughly mixes and burns natural gas and hydrogen with air, converting the chemical energy of the fuel into thermal energy.

[0044] Turbine 24c: It uses the high temperature and high pressure gas generated by fuel combustion to drive the turbine to rotate, converting the thermal energy of natural gas and hydrogen into mechanical energy.

[0045] Air Filter 04: Removes particulate impurities from the air in gas turbine equipment.

[0046] The principle of the natural gas turbine reforming hydrogen production unit in Example 2 is shown in Figure 2:

[0047] The natural gas required for the hydrogen production unit is supplied by natural gas cylinder 01. After the natural gas pressure is reduced by pressure reducing valve 02, it provides feedstock for gas turbine 24 and natural gas reformer 14. Before entering the gas turbine 24 for combustion, the natural gas enters the first injector 03 through pressure reducing valve 02, and is fully mixed and burned inside combustion chamber 24b with high-pressure air that has passed through air filter 04 and compressor 24a, driving turbine 24c to do work. The high-temperature exhaust gas containing water vapor is discharged through the blades of turbine 24c, and after passing through three-way valve 08, it enters reformer shell 14a and flow valve 09 respectively. Inside natural gas reformer shell 14a, the high-temperature exhaust gas can fully exchange heat with heat exchange tube 14b, providing the required heat for the reforming hydrogen production reaction. After heat exchange, it is discharged from exhaust port 17 of natural gas reformer hot shell 14a. Flow valve 09 effectively controls the flow rate of high-temperature exhaust gas according to the amount of water vapor required for the reforming reaction. The high-temperature exhaust gas is thoroughly mixed with the natural gas supplied by the second injector 11 inside the second mixer 12, and then enters the heat exchange tube 14b of the natural gas reformer for an endothermic reforming reaction. In the reforming reaction, the high-temperature exhaust gas containing water vapor and the natural gas serve as raw materials. Heated by the high-temperature exhaust gas in the reformer hot shell 14a and catalyzed by the catalyst inside the heat exchange tube 14b, the natural gas undergoes a thorough reforming reaction to produce hydrogen with a high calorific value. After the reforming reaction, the reformed gas mixed with the high-calorific-value hydrogen enters the cooler 19 for cooling, and after being detected by the hydrogen concentration detector 21, it enters the combustion chamber with the natural gas through the first mixer 06 for combustion. The high-calorific-value hydrogen effectively improves the combustion efficiency of the gas turbine.

[0048] The natural gas engine reforming hydrogen production device of this invention is divided into Embodiment 1 and Embodiment 2. Embodiment 1 is a natural gas internal combustion engine reforming hydrogen production device, and Embodiment 2 is a natural gas gas turbine reforming hydrogen production device. The difference between Embodiment 1 and Embodiment 2 is the use of an internal combustion engine or a gas turbine. Through the structure of this invention, not only can the heating and water supply structure of the natural gas engine reforming hydrogen production device be effectively optimized, but the high-temperature exhaust gas from the natural gas engine can also be reused for energy. Because the exhaust gas of a natural gas engine (internal combustion engine 07 or gas turbine 24) typically has a high temperature, and due to differences in engine operating conditions, the exhaust temperature is generally maintained in the range of 500-700℃, this temperature can fully meet the heating reaction conditions for natural gas reforming hydrogen production, thus giving rise to a high-temperature exhaust gas heating method. In this reaction system, natural gas is fully combusted in the natural gas engine, and part of the generated high-temperature exhaust gas provides the required steam feedstock for the reforming reaction, while the other part can provide the required high-temperature environment for the natural gas steam reforming reaction through heat exchange tubes. This device and method for heating using high-temperature exhaust gas offers numerous advantages. Compared to traditional external heating methods, it eliminates the need for large external heat inputs, reducing reliance on external heat sources, lowering equipment costs and floor space requirements, and avoiding significant heat loss during transfer, thus significantly improving energy utilization efficiency. Simultaneously, the reaction starts up relatively quickly, reaching the required temperature in a short time, improving production efficiency. Furthermore, the internal heat generated by the high-temperature exhaust gas heating maintains the high-temperature state of water vapor within the reaction system. During the reaction, the water vapor in the high-temperature exhaust continuously participates in the reforming reaction, eliminating the need for additional water vapor and achieving efficient recycling of water vapor within the reaction system, further reducing the heat required for the reaction. Finally, hydrogen, as a high-energy-density fuel, can re-participate in the combustion process, improving engine combustion efficiency and consequently enhancing thermal efficiency.

[0049] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, 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 pipe of the natural gas engine is connected to the flow pipe (22) and the reformer shell (14a) of the natural gas reformer (14). The reformer shell (14a) is equipped with a heat exchange tube (14b). The flow pipe (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.

2. The natural gas engine reforming hydrogen production apparatus 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 apparatus 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 flow pipeline (22), and the first mixer (06) is connected to the internal combustion engine (07) through the pipeline.

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

6. The natural gas engine reforming hydrogen production apparatus according to claim 3 or 4, characterized in that: A three-way valve (08) is installed 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 pipe (22), and the third passage of the three-way valve (08) is connected to the reformer housing (14a).

7. The natural gas engine reforming hydrogen production apparatus according to claim 3 or 4, characterized in that: The heat exchange tube (14b) is a serpentine pipe with reciprocating bends. 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 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 apparatus according to claim 3 or 4, characterized in that: A flow valve (09) is installed on the flow pipeline (22), a fifth temperature sensor (20) and a hydrogen concentration detector (21) are installed on the pipeline between the cooler (19) and the first mixer (06), and a second injector (11) is installed 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 apparatus according to claim 3 or 4, characterized in that: A first temperature sensor (13) is installed on the pipeline between the second mixer (12) and the heat exchange tube (14b), a second temperature sensor (15) is installed on the pipeline between the third passage of the three-way valve (08) and the reformer housing (14a), a third temperature sensor (18) is installed on the exhaust port (17), and a fourth temperature sensor (18) is installed on the pipeline between the heat exchange tube (14b) and the cooler (19).

10. The natural gas engine reforming hydrogen production apparatus according to claim 2 or 4, characterized in that: The gas turbine (24) includes 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 an air filter (04). The first mixer (06) is connected to the combustion chamber (24b). The exhaust pipe of the turbine (24c) is connected to a three-way valve (08).

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