Coupling system integrating biogas power generation and hydrogen production

Abstract

The utility model relates to a coupling system integrating biogas power generation and hydrogen production, which belongs to the technical field of hydrogen preparation in hydrogen energy and comprises a biogas supply system, a biogas power generation system and a biogas hydrogen production system. The marsh gas supply system is used for providing marsh gas for the marsh gas power generation system and the marsh gas hydrogen production system; the biogas power generation system comprises a biogas combustion generator, and the biogas combustion generator is connected with the biogas hydrogen production system through a cable; the biogas hydrogen production system comprises a heat exchanger, a reforming converter, a medium-temperature shift reactor and a steam generator, the steam generator and the heat exchanger are respectively communicated with the biogas combustion generator, the heat exchanger is communicated with the steam generator, and the reforming converter is communicated with the steam generator. According to the system, the dependence on external electric power is reduced, high-temperature flue gas generated by biogas power generation is fully utilized to supply heat to the biogas hydrogen production system, and the consumption of hydrogen production fuel biogas and the hydrogen production cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen preparation in hydrogen energy, in particular to a coupling system integrating biogas power generation and hydrogen production. Background Art

[0002] Biogas hydrogen production technology converts methane in biogas into hydrogen. Biogas is a mixed gas produced by the fermentation of organic waste. Its main components are methane and carbon dioxide. Methane reacts with water vapor at high temperatures to produce hydrogen and carbon dioxide. The hydrogen, a clean energy source, only produces water vapor upon combustion, without generating greenhouse gases or pollutants. Therefore, biogas hydrogen production technology has significant environmental and economic significance.

[0003] Traditional biogas hydrogen production technology consumes a large amount of electricity. However, this electricity is primarily sourced from external power sources, and thermal power accounts for a large portion of the electricity energy structure. Therefore, the entire hydrogen production process cannot be called green hydrogen production. To address this technical problem, the inventors have developed a new hydrogen production system. Utility Model Content

[0004] The purpose of this utility model is to provide a coupled system that integrates biogas power generation and hydrogen production to reduce dependence on external electricity, make full use of the high-temperature flue gas of biogas power generation to heat the biogas hydrogen production system, and reduce the consumption of biogas fuel for hydrogen production and the cost of hydrogen production.

[0005] The utility model provides a coupled system for integrated biogas power generation and hydrogen production, which adopts the following technical solutions:

[0006] A coupled system integrating biogas power generation and hydrogen production, comprising:

[0007] Biogas supply system, biogas power generation system and biogas hydrogen production system;

[0008] The biogas supply system is used to provide biogas to the biogas power generation system and the biogas hydrogen production system;

[0009] The biogas power generation system includes a biogas combustion generator, and the biogas combustion generator is connected to the biogas hydrogen production system via a cable;

[0010] The biogas hydrogen production system includes a heat exchanger, a reforming converter, a medium-temperature shift reactor and a steam generator. The steam generator and the heat exchanger are respectively connected to a biogas combustion generator, the heat exchanger is connected to the steam generator, and the reforming converter is connected to the steam generator.

[0011] Preferably, the biogas hydrogen production system further includes a biogas decarbonization device and a biogas compressor;

[0012] The biogas decarbonization device is connected to the biogas supply system, and the biogas decarbonization device is connected to the biogas compressor;

[0013] The biogas compressor is communicated with the heat exchanger.

[0014] Preferably, the biogas hydrogen production system further comprises a pressure swing adsorption hydrogen extraction device and a hydrogen compressor;

[0015] The pressure swing adsorption hydrogen extraction device is connected to the medium-temperature shift reactor, and the hydrogen compressor is connected to the pressure swing adsorption hydrogen extraction device.

[0016] Preferably, the pressure swing adsorption hydrogen extraction device is also connected to a biogas combustion generator.

[0017] Preferably, the biogas power generation system further includes a blower;

[0018] The blower is connected to the biogas combustion generator, and the blower is connected to the biogas supply system.

[0019] Preferably, the biogas supply system includes a biogas desulfurization device;

[0020] The biogas power generation system and the biogas hydrogen production system are respectively connected to the biogas desulfurization device.

[0021] Preferably, the reforming converter is a spiral reforming converter.

[0022] In summary, the present invention has the following beneficial technical effects:

[0023] 1. The biogas supply system in the present invention supplies biogas to the biogas power generation system and the biogas hydrogen production system. The biogas combustion generator in the biogas power generation system generates electricity and heat. The electricity is used to power the biogas hydrogen production system, reducing the dependence of the biogas hydrogen production system on external electricity. The heat acts on the heat exchanger and the steam generator, making full use of the waste heat in the flue gas generated by biogas combustion, thereby improving production efficiency and reducing production costs.

[0024] 2. The utility model is provided with a biogas decarbonization device and a biogas compressor. The biogas decarbonization device is used to remove impurities such as CO2 in the biogas to increase the methane concentration in the biogas. After the biogas is processed by the biogas decarbonization device, the pressure is low. Therefore, the biogas compressor compresses the low-pressure biogas to high-pressure biogas to meet the requirements of the subsequent hydrogen production process.

[0025] 3. The utility model is provided with a pressure swing adsorption hydrogen extraction device and a hydrogen compressor. The pressure swing adsorption hydrogen extraction device is used to purify hydrogen and produce desorbed gas of CH4, CO, H2 and CO2. Most of the H2 is collected under the action of the hydrogen compressor, and the remaining desorbed gas enters the biogas combustion generator to be burned by the biogas combustion generator to generate electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a coupled system for integrated biogas power generation and hydrogen production provided by an embodiment of the utility model.

[0027] Explanation of the accompanying symbols: 1. Biogas supply system; 11. Biogas desulfurization device; 2. Biogas power generation system; 21. Blower; 22. Biogas combustion generator; 23. Cable; 3. Biogas hydrogen production system; 31. Biogas decarbonization device; 32. Biogas compressor; 33. Heat exchanger; 34. Reforming converter; 35. Medium-temperature shift reactor; 36. Pressure swing adsorption hydrogen extraction device; 37. Hydrogen compressor; 38. Steam generator. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1 The utility model is described in further detail.

[0029] The utility model provides a coupling system integrating biogas power generation and hydrogen production, referring to Figure 1 , comprising a biogas supply system 1, a biogas power generation system 2, and a biogas hydrogen production system 3. The biogas supply system 1 provides biogas to the biogas power generation system 2 and the biogas hydrogen production system 3; the electricity and heat energy generated by the biogas power generation system 2 are transmitted to the biogas hydrogen production system 3, thereby reducing the biogas hydrogen production system 3's dependence on external electricity. The heat energy promotes the operation of the biogas hydrogen production system 3, reducing the biogas hydrogen production system 3's dependence on external heat energy and lowering its own operating costs.

[0030] Reference Figure 1 The biogas power generation system 2 includes a blower 21 and a biogas combustion generator 22. The biogas provided by the biogas supply system 1 is transported to the biogas combustion generator 22 under the action of the blower 21. The biogas combustion generator 22 is an existing technical equipment, which usually includes a biogas combustion chamber, a steam turbine and a generator. The biogas burns in the combustion chamber and produces high-temperature and high-pressure gas to drive the steam turbine to rotate, and then drive the generator to generate electricity. The biogas combustion generator 22 is connected to the biogas hydrogen production system 3 by a cable 23. The biogas combustion generator 22 provides electrical energy for the biogas hydrogen production system 3. In addition, in this embodiment, the electrical energy generated by the biogas combustion generator 22 can also be used in the biogas power generation system 2.

[0031] Reference Figure 1The biogas hydrogen production system 3 includes a biogas decarbonization device 31, a biogas compressor 32, a heat exchanger 33, a reforming converter 34, a medium-temperature shift reactor 35, a pressure swing adsorption hydrogen extraction device 36, a hydrogen compressor 37 and a steam generator 38. In this embodiment, the biogas provided by the biogas supply system 1 first enters the biogas decarbonization device 31, and the biogas decarbonization device 31 uses a pressure swing adsorption method to decarbonize the biogas. The biogas decarbonization device 31 uses the difference in adsorption selectivity of CH4 and CO2 to separate CH4 and CO2 under pressure changes, so that the content of CH4 in the biogas is increased from 55-70% to 95-98%; the separated methane enters the biogas compressor 32 to compress the low-pressure biogas to 2MPa; the high-pressure biogas enters the heat exchanger 33, and the heat exchanger 33 decarbonizes the biogas. The preheated biogas enters the reformer 34. In this embodiment, the reformer 34 uses a spiral reformer 34, and reacts the biogas with water vapor to generate H2, CO, and CO2 conversion gas. The medium-temperature shift reactor 35 converts the CO and water vapor in the conversion gas into a synthesis gas of H2 and CO2. The pressure swing adsorption hydrogen extraction device 36 purifies the generated H2 and produces a desorbed gas of CH4, CO, H2, and CO2. The hydrogen compressor 37 compresses the H2 to meet the storage, transportation, and use of H2. At the same time, the output port of the pressure swing adsorption hydrogen extraction device 36 is connected to the input port of the biogas combustion generator 22. The pressure swing adsorption hydrogen extraction device 36 transports CH4, CO, CO2, and a small amount of H2 to the biogas combustion generator 22 to serve as fuel for the biogas combustion generator 22.

[0032] Reference Figure 1 In the biogas hydrogen production system 3 of this embodiment, the steam generator 38 and heat exchanger 33 are respectively connected to the biogas combustion generator 22, and the heat exchanger 33 and the reformer 34 are respectively connected to the steam generator 38. Specifically, the biogas combustion generator 22 of this embodiment can generate flue gas at 850-900°C, which provides heat to the heat exchanger 33 and steam generator 38. The heat exchanger 33 uses the heat from the flue gas in the biogas combustion generator 22 and the heat from the steam generator 38 to raise the biogas temperature to 380-420°C, which is then transported to the reformer 34. The steam generator 38 also uses the heat from the flue gas to generate 2.8-3.1 MPa water vapor at 280-320°C, which is then transported to the reformer 34, allowing the reformer 34 to produce H2, CO, and CO2 conversion gas.

[0033] Reference Figure 1 The biogas supply system 1 includes a biogas desulfurization device 11, which is used to remove sulfides from the biogas to below 0.5 ppm. A blower 21 and a biogas decarbonization device 31 are respectively connected to the biogas desulfurization device 11. In other words, the biogas treated by the biogas desulfurization device 11 is divided into two parts, which then enter the blower 21 and the biogas decarbonization device 31.

[0034] The implementation principle of the coupled system of integrated biogas power generation and hydrogen production in this utility model is as follows:

[0035] The biogas after desulfurization treatment by the biogas desulfurization device 11 enters the blower 21 and the biogas decarbonization device 31 respectively. The blower 21 transports the biogas to the biogas combustion generator 22. The biogas combustion generator 22 burns the biogas to generate heat and electricity. The electricity can be used to supply the biogas hydrogen production system 3 for normal operation. The biogas treated by the biogas decarbonization device 31 enters the heat exchanger 33 through the biogas compressor 32. The heat generated by the combustion of the biogas combustion generator 22 is provided to the heat exchanger 33 and the steam generator 38. The biogas in the heat exchanger 33 is heated to the expected temperature and transported to the reforming converter 34. The steam generator 38 is heated to generate water vapor and is transported to the reformer 34, so that the reformer 34 reacts the biogas and water vapor to generate H2, CO and CO2 conversion gas. The medium-temperature shift reactor 35 converts the CO and water vapor in the conversion gas into synthesis gas of H2 and CO2. The pressure swing adsorption hydrogen extraction device 36 purifies the generated H2 and produces desorption gas of CH4, CO, H2 and CO2. Most of the H2 is collected by the hydrogen compressor 37, and the remaining CH4, CO, CO2 and a small amount of H2 are transmitted to the biogas combustion generator 22 as fuel.

[0036] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coupled system integrating biogas power generation and hydrogen production, characterized in that: include: Biogas supply system (1), biogas power generation system (2) and biogas hydrogen production system (3); The biogas supply system (1) is used to provide biogas to the biogas power generation system (2) and the biogas hydrogen production system (3); The biogas power generation system (2) includes a biogas combustion generator (22), and the biogas combustion generator (22) is connected to the biogas hydrogen production system (3) via a cable (23); The biogas hydrogen production system (3) includes a heat exchanger (33), a reforming converter (34), a medium-temperature shift reactor (35) and a steam generator (38). The steam generator (38) and the heat exchanger (33) are respectively connected to the biogas combustion generator (22). The heat exchanger (33) is connected to the steam generator (38), and the reforming converter (34) is connected to the steam generator (38).

2. The coupled system for integrated biogas power generation and hydrogen production according to claim 1, characterized in that: The biogas hydrogen production system (3) further includes a biogas decarbonization device (31) and a biogas compressor (32); The biogas decarbonization device (31) is connected to the biogas supply system (1), and the biogas decarbonization device (31) is connected to the biogas compressor (32); The biogas compressor (32) is in communication with the heat exchanger (33).

3. The coupled system for integrated biogas power generation and hydrogen production according to claim 1, characterized in that: The biogas hydrogen production system (3) further includes a pressure swing adsorption hydrogen extraction device (36) and a hydrogen compressor (37); The pressure swing adsorption hydrogen extraction device (36) is connected to the medium-temperature shift reactor (35), and the hydrogen compressor (37) is connected to the pressure swing adsorption hydrogen extraction device (36).

4. The integrated biogas power generation and hydrogen production coupling system according to claim 3, characterized in that: The pressure swing adsorption hydrogen extraction device (36) is also connected to the biogas combustion generator (22).

5. The integrated biogas power generation and hydrogen production coupling system according to claim 1, characterized in that: The biogas power generation system (2) further includes a blower (21); The blower (21) is connected to the biogas combustion generator (22), and the blower (21) is connected to the biogas supply system (1).

6. The integrated biogas power generation and hydrogen production coupling system according to claim 1, characterized in that: The biogas supply system (1) includes a biogas desulfurization device (11); The biogas power generation system (2) and the biogas hydrogen production system (3) are respectively connected to the biogas desulfurization device (11).

7. The integrated biogas power generation and hydrogen production coupling system according to claim 1, characterized in that: The reforming converter (34) is a spiral reforming converter (34).

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