Biomass biogas pox conversion coupled green hydrogen production green methanol device

Abstract

The utility model discloses a kind of green methanol devices of biomass biogas POX conversion coupling green hydrogen production, comprising: first compression device, desulfurization device, POX conversion device, electrolytic water device, high-level energy heat recovery device, second compression device, methanol synthesis device and methanol rectification device.Adopt the utility model, biogas obtained from biomass fermentation, hydrogen and oxygen obtained from green electricity electrolytic water hydrogen production are used as raw material to produce green methanol fully and efficiently.Utilization can be achieved zero emission of CO2 in entire methanol device in process.The process can adapt to high CO2 content in biogas, and CO2 in biogas is used as carbon source of methanol, effectively utilized.The whole process is more simplified, and has good economic and environmental benefits.

Description

Technical Field

[0001] This utility model relates to the field of green methanol production from biomass-derived biogas. Specifically, it relates to a biomass biogas POX conversion and green hydrogen coupling device that produces green methanol from biogas without methane enrichment through non-catalytic partial oxidation of POX to syngas, coupled with green electricity for water electrolysis to produce hydrogen, and then uses this hydrogen for green methanol production. Background Technology

[0002] The key to carbon emission reduction in the shipping industry lies in finding green and low-carbon fuels to replace the existing traditional energy structure. In comparison, green alternative fuels, represented by methanol, are one of the important ways to achieve the shipping industry's "dual carbon" goals in a short time, with quick results and a wide impact.

[0003] Green methanol integrates biomass energy, hydrogen energy, carbon cycle, electricity substitution, and fuel substitution technologies, combining various new energy systems into a single operating system. It is a recognized new type of clean energy and a key energy source for my country. Green methanol is hailed as "clean coal, cheap oil, simple gas, mobile electricity, and liquid hydrogen," possessing green attributes such as high combustion efficiency, clean emissions, and renewability. Its carbon emission performance throughout its entire life cycle is better than pure electricity (for example, when heavy-duty trucks use green methanol, CO2 emissions can be reduced to 0.3 kg / km, a reduction of 80%). It is liquid at normal temperature and pressure, making its storage, transportation, and use costs lower than other energy sources. Its production source is renewable; through the clean and efficient utilization of biomass, it can "turn waste into treasure."

[0004] Currently, the comprehensive utilization of biogas mainly involves power generation or heating, enrichment and purification to produce LNG or CNG, and enrichment and purification to produce green methanol. Since biogas contains a large amount of CO2 and a small amount of sulfur, desulfurization, decarbonization and other purification and enrichment treatments are required in the deep processing of biogas. The process is long and the investment is high.

[0005] Considering that biogas produced from biomass fermentation contains approximately 55% methane and 40% CO2, using this unconcentrated biogas as raw material, non-catalytic partial oxidation of POX can bypass decarbonization and directly produce carbon-rich, hydrogen-deficient syngas, primarily composed of H2, CO, and CO2, through dry reforming. Green hydrogen can be obtained by electrolyzing water using green electricity generated from wind and solar power. Hydrogen production can be achieved by coupling the syngas from biomass biogas converted from POX with green electricity; the resulting mixture of these two "green gases" can be adjusted to meet the methanol hydrogen-to-carbon ratio requirements. This syngas then passes through a methanol synthesis unit and a methanol distillation unit to obtain green methanol that meets national standards. Furthermore, this process can achieve zero CO2 emissions.

[0006] Non-catalytic partial oxidation of POX technology is a safe, reliable, simple, and direct syngas production technology. The applicant has extensive experience in applying this technology. Compared with other conversion technologies, the non-catalytic partial oxidation of POX process has advantages such as low steam consumption, high carbon monoxide yield, high converter outlet temperature, and low requirements for the impurity content of the feed gas. Therefore, using the advanced non-catalytic partial oxidation of POX process to convert unenriched biogas into syngas, and then adding green hydrogen to adjust the hydrogen-to-carbon ratio for the production of green methanol, is a mature and reliable process for producing green methanol. Utility Model Content

[0007] The technical problem this invention aims to solve is to provide a biomass biogas POX conversion coupled with green hydrogen to produce green methanol, addressing the process of converting unenriched biogas into syngas. In this green methanol production process, the biomass biogas does not require complex methane enrichment and can be coupled with green electricity to produce hydrogen. This allows for the efficient and full utilization of both the hydrogen obtained from water electrolysis and the byproduct oxygen, achieving zero CO2 emissions from the entire methanol plant and demonstrating significant economic and environmental benefits.

[0008] The technical problem to be solved by this utility model can be achieved through the following technical solution:

[0009] A biomass biogas POX conversion coupled with green hydrogen to produce green methanol unit includes:

[0010] A first compression device has an uncompressed biogas inlet and a compressed biogas outlet. The first compression device compresses the uncompressed biogas fed in through the uncompressed biogas inlet into compressed biogas and sends it out through the compressed biogas outlet.

[0011] The desulfurization device has a compressed biogas inlet, a biogas outlet without methane enrichment, a first syngas inlet, and a first syngas outlet. The compressed biogas inlet is connected to the compressed biogas outlet through a biogas transmission pipeline. The desulfurization device performs desulfurization treatment on the compressed biogas. The first syngas is used to preheat the compressed biogas to a suitable temperature to improve the desulfurization effect.

[0012] The POX conversion device has a desulfurized biogas inlet without methane enrichment, an oxygen inlet, and a second syngas outlet; the desulfurized biogas inlet without methane enrichment is connected to the biogas outlet without methane enrichment via a methane delivery pipeline.

[0013] An electrolysis water device, the electrolysis water device having an oxygen outlet and a hydrogen outlet, the oxygen outlet being connected to the oxygen inlet via an oxygen delivery pipeline;

[0014] A high-level heat recovery device is provided, comprising a second syngas inlet, a third syngas outlet, a boiler feedwater inlet, and a steam outlet. The second syngas inlet is connected to the second syngas outlet via a first syngas delivery pipeline. The high-temperature syngas from the second syngas outlet undergoes heat recovery through the high-level heat recovery device. The heat-recovered syngas is then discharged through the third syngas outlet. Water supplied through the boiler feedwater inlet exchanges heat with the high-temperature syngas to form steam, which is then discharged out of the boundary area through the steam outlet. The third syngas outlet is connected to the first syngas inlet via the second syngas delivery pipeline. A desulfurization device desulfurizes the compressed biogas.

[0015] The second compression device has a first green gas inlet and a second green gas outlet. The first green gas inlet is connected to the first synthesis gas outlet through a first green gas delivery pipeline, and the hydrogen outlet is connected to the first green gas delivery pipeline through a hydrogen delivery pipeline.

[0016] A methanol synthesis unit, wherein the methanol synthesis unit has a second green gas inlet, a crude methanol outlet and a purge gas outlet, the second green gas inlet is connected to the second green gas outlet through a second green gas delivery pipeline, and the purge gas outlet is connected to the fuel pipeline network through a purge gas delivery pipeline;

[0017] A methanol distillation unit has a crude methanol inlet and a refined methanol outlet. The crude methanol inlet is connected to the crude methanol outlet via a crude methanol delivery pipeline. After being distilled by the methanol distillation unit, the crude methanol is converted into refined methanol and sent out of the boundary area through the refined methanol outlet.

[0018] In a preferred embodiment of this utility model, the burner of the POX conversion device is the non-catalytic partial oxidation syngas burner disclosed in Chinese Patent No. ZL201110138654.7.

[0019] In a preferred embodiment of this utility model, the methanol distillation device is the intelligent control multi-effect distillation device disclosed in Chinese Patent No. ZL202120330987.9.

[0020] In a preferred embodiment of this invention, the methanol synthesis apparatus is a shell-and-tube fixed-bed isothermal reactor.

[0021] Due to the adoption of the above technical solution, this utility model has the following characteristics:

[0022] (1) More rational resource utilization: Biomass biogas is converted into green methanol through POX conversion coupled with green electricity to produce hydrogen. This process fully and efficiently utilizes the biogas obtained from biomass fermentation, the hydrogen and oxygen obtained from green electricity electrolysis of water as raw materials for the production of green methanol, resulting in low unit consumption and low cost of green methanol. At the same time, this process shortens the green methanol process flow and saves fixed asset investment.

[0023] Biogas typically produced through biomass fermentation contains approximately 55% methane and 40% CO2. Syngas obtained from this unconcentrated biogas through non-catalytic partial oxidation of POX is generally carbon-rich and hydrogen-deficient. Green hydrogen can be obtained by electrolyzing water using green electricity generated from wind and solar power. Hydrogen production can be achieved by coupling syngas from biomass biogas converted to POX with green electricity; the resulting mixture of these two "green gases" can be adjusted to achieve the optimal (H2-CO2) / (CO+CO2) ratio for methanol synthesis, thus ensuring full resource utilization.

[0024] (2) Environmental Protection: Biomass biogas is converted into green methanol via POX conversion coupled with green electricity generation. This process eliminates the need for conversion and decarbonization stages, maximizing carbon source utilization and achieving zero CO2 emissions while reducing the specific consumption of green methanol. Typically, biogas produced through biomass fermentation contains approximately 55% methane and 40% CO2. This process can accommodate the high CO2 content in biogas and effectively utilizes the CO2 as a carbon source for methanol, thus significantly reducing the specific consumption of green methanol.

[0025] (3) This device fully and efficiently utilizes biogas obtained from biomass fermentation, hydrogen and oxygen obtained from green electricity electrolysis of water to produce hydrogen, as raw materials for the production of green methanol. Moreover, biogas does not require methane concentration treatment during the process of producing green methanol.

[0026] (4) The device uses biomass biogas converted by POX to produce syngas coupled with green electricity to produce hydrogen. The two streams of "green gas" after mixing can be adjusted to meet the methanol hydrogen-carbon ratio (H2-CO2) / (CO+CO2) requirement. There is no need to adjust the hydrogen-carbon ratio to meet the methanol synthesis requirements through conversion and decarbonization sections.

[0027] (5) This process can efficiently and fully utilize both the hydrogen obtained from water electrolysis and the byproduct oxygen. The oxygen required for non-catalytic partial oxidation does not need to be met by setting up an additional oxygen generation unit, which greatly reduces the investment in green methanol plants.

[0028] (6) This device does not require a conversion section and a decarbonization section, and can achieve zero CO2 emissions from the entire methanol plant, which has great environmental benefits.

[0029] (7) Typically, biogas produced by biomass fermentation contains about 55% methane and about 40% CO2. This process can adapt to the high CO2 content in biogas and effectively utilize the CO2 in biogas as a carbon source for methanol.

[0030] (8) The biogas produced in this device does not require methane enrichment treatment. Typically, biogas produced by biomass fermentation contains about 55% methane and about 40% CO2. This process can adapt to the high CO2 content in biogas and effectively utilizes the CO2 in biogas as a carbon source for methanol. Attached Figure Description

[0031] Figure 1 This is a process flow diagram of the biomass biogas POX conversion coupled with green hydrogen to produce green methanol device according to this utility model. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] Biogas produced from biomass fermentation typically contains about 55% methane and 40% CO2. Syngas obtained from this unconcentrated biogas through non-catalytic partial oxidation of POX is generally carbon-rich and hydrogen-deficient. Green hydrogen can be obtained by electrolyzing water using green electricity generated from wind and solar power. Hydrogen can then be produced by coupling the syngas from biomass biogas converted from POX with green electricity. The resulting mixture of these two "green gases" can be adjusted to meet the methanol hydrogen-to-carbon ratio (H2-CO2) / (CO+CO2) requirement. This syngas then passes through a methanol synthesis unit and a methanol distillation unit to obtain green methanol that meets national standards.

[0034] See Figure 1 The figure shows a biomass biogas POX conversion coupled with green hydrogen to produce green methanol device, which includes: a first compression unit 100, a desulfurization unit 200, a POX conversion unit 300, a water electrolysis unit 400, a high-energy heat recovery unit 500, a second compression unit 600, a methanol synthesis unit 700, and a methanol distillation unit 800.

[0035] The first compression device 100 has an uncompressed biogas inlet 110 and a compressed biogas outlet 120. The first compression device 100 compresses the uncompressed biogas fed in through the uncompressed biogas inlet 110 into compressed biogas and sends it out through the compressed biogas outlet 120.

[0036] The desulfurization unit 200 has a compressed biogas inlet 210, a biogas outlet 220 without methane enrichment, a first syngas inlet 230, and a first syngas outlet 240; the compressed biogas inlet 210 is connected to the compressed biogas outlet 120 through a biogas transmission pipeline 910.

[0037] The POX converter's 300 burner is a core piece of equipment, directly affecting the conversion efficiency and carbon black formation of the conversion system. Due to the increased CO2 input into the converter, the tendency for carbon black formation increases. To address the high yield stress and corrosion issues faced by POX burners under high-temperature conditions, the applicant uses a non-catalytic partial oxidation syngas burner disclosed in Chinese Patent No. ZL201110138654.7. This burner allows for more complete mixing and combustion of biogas and oxidant, improves the feedstock gas conversion rate, effectively avoids carbon black formation in the converter, and facilitates the conversion of biogas with high CO2 content into syngas in the conversion section. This syngas is then coupled with green electricity for water electrolysis to obtain green hydrogen, adjusting it to meet the hydrogen-to-carbon ratio requirements for methanol synthesis.

[0038] The POX conversion unit 300 also has a biogas inlet 310 without methane enrichment, an oxygen inlet 320, and a second syngas outlet 330; the biogas inlet 310 without methane enrichment is connected to the biogas outlet 220 without methane enrichment via a methane delivery pipeline 920.

[0039] The water electrolysis device 400 has an oxygen outlet 410 and a hydrogen outlet 420. The oxygen outlet 410 is connected to the oxygen inlet 320 via an oxygen delivery pipeline 930.

[0040] The high-energy heat recovery device 500 has a second syngas inlet 510, a third syngas outlet 520, a boiler feedwater inlet 530, and a steam outlet 540. The second syngas inlet 510 is connected to the second syngas outlet 330 through a first syngas delivery pipeline 940. The high-temperature syngas sent from the second syngas outlet 330 undergoes heat recovery through the high-energy heat recovery device 500. The syngas after heat recovery is sent out through the third syngas outlet 520. The water sent in through the boiler feedwater inlet 530 exchanges heat with the high-temperature syngas to form steam, which is sent out of the boundary area through the steam outlet 540. The third syngas outlet 520 is connected to the first syngas inlet 230 through a second syngas delivery pipeline 950. The desulfurization device 200 desulfurizes the compressed biogas.

[0041] The second compression device 600 has a first green gas inlet 610 and a second green gas outlet 620. The first green gas inlet 610 is connected to the first synthesis gas outlet 240 through a first green gas delivery pipeline 960, and the hydrogen outlet 420 is connected to the first green gas delivery pipeline 960 through a hydrogen delivery pipeline 970.

[0042] The methanol synthesis unit 700 uses a shell-and-tube fixed-bed isothermal reactor as disclosed in Chinese Patent No. 202110961997.7. It obtains crude methanol using methanol synthesis technology characterized by an isothermal tubular methanol synthesis reactor. The methanol synthesis unit 700 has a second green gas inlet 710, a crude methanol outlet 720, and a purge gas outlet 730. The second green gas inlet 710 is connected to the second green gas outlet 620 through a second green gas conveying pipeline 980, and the purge gas outlet 730 is connected to the fuel pipeline network 1000 through a purge gas conveying pipeline 990.

[0043] The methanol distillation unit 800 is a smart-controlled multi-effect distillation unit disclosed in Chinese Patent No. ZL 202120330987.9. This methanol distillation unit 800 has a crude methanol inlet 810 and a refined methanol outlet 820. The crude methanol inlet 810 is connected to the crude methanol outlet 720 via a crude methanol delivery pipeline 1100. After being distilled by the methanol distillation unit 800, the crude methanol is converted into refined methanol, which is then discharged out of the boundary area through the refined methanol outlet 820.

[0044] This invention utilizes biogas obtained from biomass fermentation, hydrogen and oxygen obtained from water electrolysis via green electricity, and other raw materials for the production of green methanol, achieving full and efficient utilization. The entire methanol plant can achieve zero CO2 emissions. This process can adapt to the high CO2 content in biogas and effectively utilizes the CO2 from biogas as a carbon source for methanol. The entire process is simplified, offering significant economic and environmental benefits.

[0045] The specific effects that can be achieved are as follows:

[0046] (1) The biogas obtained from biomass fermentation, hydrogen and oxygen obtained from water electrolysis by green electricity are used as raw materials for the production of green methanol in a full and efficient manner. By coupling the syngas from biomass biogas through POX conversion with green electricity to produce hydrogen, the two streams of "green gas" can be adjusted to meet the methanol hydrogen-carbon ratio (H2-CO2) / (CO+CO2) requirement.

[0047] (2) This utility model does not require the setting of conversion and decarbonization sections, achieving zero CO2 emissions from the entire methanol plant, and has the advantages of shortening the process flow and saving fixed asset investment.

[0048] (3) This utility model can adapt to the high CO2 content in biogas and use CO2 in biogas as a carbon source for methanol, effectively utilizing it, reducing methanol consumption, simplifying the whole process, and having good economic and environmental benefits.

[0049] (4) This invention can efficiently and fully utilize both the hydrogen obtained from water electrolysis and the byproduct oxygen. The oxygen required by the non-catalytic partial oxidation of POX process does not need to be met by an additional oxygen generation device, which greatly reduces the investment in green methanol plants.

[0050] For example, taking the production of green methanol from biomass biogas coupled with green electricity as an example, the main streams after treatment in this practical application are as follows:

[0051]

[0052]

[0053] Using this invention, the biogas produced by biomass fermentation contains approximately 55% methane and 40% CO2. Using this unconcentrated biogas as raw material, syngas obtained through non-catalytic partial oxidation of POX is used. Green hydrogen can then be obtained by electrolyzing water using green electricity generated from wind and solar power. Hydrogen is produced by coupling the syngas from biogas converted from POX with green electricity. The two streams of "green gas" can be adjusted to meet the methanol hydrogen-to-carbon ratio (H2-CO2) / (CO+CO2) requirement. This syngas is then processed through a methanol synthesis unit and a methanol distillation unit to obtain green methanol that meets national standards.

Claims

1. A biomass biogas POX conversion coupled with green hydrogen to produce green methanol device, characterized in that, include: A first compression device has an uncompressed biogas inlet and a compressed biogas outlet. The first compression device compresses the uncompressed biogas fed in through the uncompressed biogas inlet into compressed biogas and sends it out through the compressed biogas outlet. A desulfurization device, comprising a compressed biogas inlet, a biogas outlet without methane enrichment, a first syngas inlet, and a first syngas outlet; the compressed biogas inlet is connected to the compressed biogas outlet via a biogas transmission pipeline. The POX conversion device has a biogas inlet without methane enrichment, an oxygen inlet, and a second syngas outlet; the biogas inlet without methane enrichment is connected to the biogas outlet without methane enrichment via a methane delivery pipeline. An electrolysis water device, the electrolysis water device having an oxygen outlet and a hydrogen outlet, the oxygen outlet being connected to the oxygen inlet via an oxygen delivery pipeline; A high-level heat recovery device is provided, comprising a second syngas inlet, a third syngas outlet, a boiler feedwater inlet, and a steam outlet. The second syngas inlet is connected to the second syngas outlet via a first syngas delivery pipeline. The high-temperature syngas from the second syngas outlet undergoes heat recovery through the high-level heat recovery device. The heat-recovered syngas is then discharged through the third syngas outlet. Water supplied through the boiler feedwater inlet exchanges heat with the high-temperature syngas to form steam, which is then discharged out of the boundary area through the steam outlet. The third syngas outlet is connected to the first syngas inlet via the second syngas delivery pipeline. A desulfurization device desulfurizes the compressed biogas. The second compression device has a first green gas inlet and a second green gas outlet. The first green gas inlet is connected to the first synthesis gas outlet through a first green gas delivery pipeline, and the hydrogen outlet is connected to the first green gas delivery pipeline through a hydrogen delivery pipeline. A methanol synthesis unit, wherein the methanol synthesis unit has a second green gas inlet, a crude methanol outlet and a purge gas outlet, the second green gas inlet is connected to the second green gas outlet through a second green gas delivery pipeline, and the purge gas outlet is connected to the fuel pipeline network through a purge gas delivery pipeline; A methanol distillation unit has a crude methanol inlet and a refined methanol outlet. The crude methanol inlet is connected to the crude methanol outlet via a crude methanol delivery pipeline. After being distilled by the methanol distillation unit, the crude methanol is converted into refined methanol and sent out of the boundary area through the refined methanol outlet.

2. The biomass biogas POX conversion coupled with green hydrogen to produce green methanol device according to claim 1, characterized in that, The burner of the POX conversion device is a non-catalytic partial oxidation syngas burner.

3. The biomass biogas POX conversion coupled with green hydrogen to produce green methanol device according to claim 1, characterized in that, The methanol distillation unit is an intelligent control type multi-effect distillation unit.

4. The biomass biogas POX conversion coupled with green hydrogen to produce green methanol device according to claim 1, characterized in that, The methanol synthesis unit is a shell-and-tube fixed-bed isothermal reactor.

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