Methanol preparation system for hydrogen production through electrolysis of water and biomass resourceful treatment

Abstract

The utility model discloses a methanol preparation system for hydrogen production by electrolysis of water and biomass resourceful treatment. Comprising an anaerobic fermentation device, a methane reforming device, a first synthesis gas buffer tank, a first methanol synthesis device, a biomass boiler, a carbon dioxide trapping device, a second synthesis gas buffer tank, a second methanol synthesis device, a methanol storage tank, a water electrolysis device, a hydrogen storage tank and an oxygen storage tank, biomass which is high in water content and easy to biodegrade is input into the anaerobic fermentation device, biomass which is low in water content and easy to burn is input into the biomass boiler, and the electricity input of the water electrolysis device is green electricity generated by a photovoltaic and wind power system. The device disclosed by the utility model has the advantages that the green methanol is synthesized by utilizing hydrogen generated by electrolyzing water and a green carbon source prepared by anaerobic fermentation and oxygen-enriched combustion of biomass, so that resource treatment of different types of biomass is realized, and efficient development and utilization of biomass energy are also realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy technology field, especially relate to a kind of methanol preparation system of electrolytic water hydrogen production synergy biomass resource treatment. BACKGROUND

[0002] With the economic development of our country, the demand of energy is more and more flourishing. For a long time, the energy consumption structure of our country is mainly fossil energy such as coal, oil and natural gas. The large use of fossil energy leads to the continuous rise of carbon dioxide emission in China. As an environmentally friendly renewable carbon resource, biomass can perfectly meet the demand of "double carbon" target, and is the main option to replace fossil energy internationally.

[0003] Biomass is a kind of green and renewable energy, which has the characteristics of renewability, low pollution and wide distribution. China is a big agricultural country, and the biomass resources are abundant. About 1 billion tons of biomass waste can be produced every year, among which 400 million tons of crop straw can be collected every year as the main biomass waste category. Biomass mainly includes crop straw, agricultural processing residues, firewood and forestry processing residues, poultry manure, urban organic waste, etc. Biomass can be converted into various terminal energies such as electricity, gaseous fuel, solid fuel and liquid fuel, etc., and has broad development prospects. Among them, the synthesis of green methanol from biomass has attracted widespread attention. Methanol is the basic raw material and important solvent of various organic products, and it is liquid at room temperature, which is a clean energy that is easy to transport. Methanol can also be mixed with gasoline as automobile fuel, which reduces the dependence of our country on oil. The resource utilization of biomass waste not only contributes to the recycling of biomass, but also realizes the conversion and utilization of carbon resources in negative carbon biomass. CONTENT OF UTILITY MODEL

[0004] The utility model aims at providing a kind of methanol preparation system of electrolytic water hydrogen production synergy biomass resource treatment, utilize the hydrogen gas generated by electrolytic water and the green carbon source prepared by biomass anaerobic fermentation, biomass oxygen-enriched combustion to synthesize green methanol, realize the resource treatment of different types of biomass at the same time, also realize the efficient development and utilization of biomass energy.

[0005] The above technical purpose of the utility model is realized by the following technical scheme:

[0006] The application discloses a methanol preparation system for electrolysis of water and hydrogen and biomass resource treatment, and is characterized in that the system comprises an anaerobic fermentation device, a methane reforming device, a first synthesis gas buffer tank, a first methanol synthesis device, a biomass boiler, a carbon dioxide capturing device, a second synthesis gas buffer tank, a second methanol synthesis device, a methanol storage tank, a water electrolysis device, a hydrogen storage tank and an oxygen storage tank, water-containing and biodegradable biomass is input into the anaerobic fermentation device, the anaerobic fermentation device, the methane reforming device, the first synthesis gas buffer tank and the first methanol synthesis device are sequentially connected, water-containing and combustible biomass is input into the biomass boiler, the biomass boiler, the carbon dioxide capturing device, the second synthesis gas buffer tank and the second methanol synthesis device are sequentially connected, the methanol storage tank is connected with the first methanol synthesis device and the second methanol synthesis device respectively, green electricity generated by a photovoltaic and wind power system is used as the power input of the water electrolysis device, the water electrolysis device is sequentially connected with the hydrogen storage tank and the oxygen storage tank respectively, and the oxygen storage tank is connected with the first synthesis gas buffer tank and the second synthesis gas buffer tank respectively.

[0007] Preferably, the water electrolysis device is further connected with a power storage device in parallel at the power input port.

[0008] Preferably, a first material receiving and conveying device and a pretreatment device are further sequentially arranged at the front end of the inlet of the anaerobic fermentation device according to the feeding direction, a dewatering device and an organic fertilizer production device are further sequentially connected to the residue outlet of the anaerobic fermentation device, and the dewatering device is further connected with a biogas slurry storage tank.

[0009] Preferably, a filtering and desulfurizing device and a decarbonization device are further sequentially connected between the anaerobic fermentation device and the methane reforming device, the decarbonization device is further connected with a biogas storage tank, and the biogas storage tank is connected with the methane reforming device.

[0010] Preferably, a heat recovery device and a synthesis gas purifying device are further sequentially connected between the methane reforming device and the first synthesis gas buffer tank, and a first synthesis gas compressor is further connected between the first synthesis gas buffer tank and the methanol synthesis device.

[0011] Preferably, a second material receiving and conveying device is further connected to the front end of the inlet of the biomass boiler, and a gas-gas heat exchanger, a dust and desulfurizing device and a condenser are further sequentially connected between the biomass boiler and the carbon dioxide capturing device, and the biomass boiler and the gas-gas heat exchanger are connected with each other.

[0012] Preferably, a carbon dioxide storage tank is further connected between the carbon dioxide capturing device and the second synthesis gas buffer tank, and the carbon dioxide storage tank is connected with the decarbonization device.

[0013] Preferably, a first synthesis gas compressor is arranged between the first synthesis gas buffer tank and the first methanol synthesis device, a second synthesis gas compressor is arranged between the second synthesis gas buffer tank and the second methanol synthesis device, and the first methanol synthesis device and the second methanol synthesis device are respectively connected with rectification devices, and the rectification devices are connected with the methanol storage tank.

[0014] Preferably, a mixer is arranged between the condenser and the oxygen storage tank, and the mixer is connected with the gas-gas heat exchanger.

[0015] Preferably, the biomass boiler is further sequentially connected with a steam turbine, a condenser and a feed water pump, the feed water pump is further connected with the biomass boiler, and the steam turbine is further connected with a generator.

[0016] In summary, the present application has the following beneficial effects:

[0017] The green methanol preparation system provided by the present application produces green high-value-added methanol, biological natural gas, hydrogen, pure oxygen and organic fertilizer products through the innovation and organic cooperation of multiple industrial technologies such as water electrolysis, biomass anaerobic fermentation, biomass oxygen-enriched combustion, CO2 capture and methane reforming, and simultaneously realizes efficient and safe utilization of hydrogen energy and consumption of renewable energy.

[0018] The water electrolysis system of the present application produces hydrogen and oxygen, the hydrogen is used for preparing methanol and strengthening anaerobic fermentation, and the problem of hydrogen storage and transportation is solved; the high-purity oxygen is used for biomass oxygen-enriched combustion power generation, improves the biomass combustion efficiency, increases the CO2 volume fraction in flue gas, effectively reduces the SO2 and NOx emissions, and provides a good foundation for efficient CO2 capture. X

[0019] The present application adopts different carbon source preparation technologies for different types of biomass, the biomass with high water content and easy biodegradation is prepared into green carbon sources mainly containing CO through anaerobic fermentation technology, the biomass with low water content and easy combustion is prepared into green carbon sources mainly containing CO2 through oxygen-enriched combustion technology to prepare green methanol, realizes the resource treatment of biomass, produces high-value green methanol, reduces the emission of carbon dioxide, and realizes the goal of green and clean. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall system of the present application;

[0021] ​In the diagram, 1 is the first material receiving and conveying device, 2 is the pretreatment device, 3 is the anaerobic fermentation device, 4 is the filtration and desulfurization device, 5 is the decarbonization device, 6 is the biogas storage tank, 7 is the methane reforming device, 8 is the heat recovery device, 9 is the syngas purification device, 10 is the first syngas buffer tank, 11 is the first syngas compressor, 12 is the first methanol synthesis device, 13 is the dehydration device, 14 is the biogas slurry storage tank, 15 is the organic fertilizer production device, 16 is the energy storage device, 17 is the water electrolysis device, and 18 is the hydrogen... 19 is an oxygen storage tank; 20 is a mixer; 21 is a second material receiving and conveying device; 22 is a biomass boiler; 23 is a gas-to-gas heat exchanger; 24 is a dust removal and desulfurization device; 25 is a condenser; 26 is a carbon dioxide capture device; 27 is a carbon dioxide storage tank; 28 is a second syngas buffer tank; 29 is a second syngas compressor; 30 is a second methanol synthesis unit; 31 is a distillation unit; 32 is a methanol storage tank; 33 is a steam turbine; 34 is a generator; 35 is a condenser; and 36 is a feedwater pump. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation on this utility model.

[0023] like Figure 1 The methanol production system shown is a combination of water electrolysis for hydrogen production and biomass resource utilization. It includes an anaerobic fermentation unit 3, a methane reforming unit 7, a first syngas buffer tank 10, a first methanol synthesis unit 12, a biomass boiler 22, a carbon dioxide capture unit 26, a second syngas buffer tank 28, a second methanol synthesis unit 30, a methanol storage tank 32, a water electrolysis unit 17, a hydrogen storage tank 18, and an oxygen storage tank 19. High-moisture, easily biodegradable biomass is input into the anaerobic fermentation unit 3. The anaerobic fermentation unit 3, methane reforming unit 7, first syngas buffer tank 10, and first methanol synthesis unit 12 are connected to the biomass boiler 22. The device 12 is connected in sequence. Biomass with low moisture content and easy combustion is input into the biomass boiler 22. The biomass boiler 22, carbon dioxide capture device 26, second syngas buffer tank 28 and second methanol synthesis device 30 are connected in sequence. Methanol storage tank 32 is connected to the first methanol synthesis device 12 and the second methanol synthesis device 30 respectively. The power input of the water electrolysis device 17 is green electricity generated by photovoltaic and wind power systems. The water electrolysis device 17 is connected to the hydrogen storage tank 18 and oxygen storage tank 19 in sequence. Oxygen storage tank 19 is connected to the first syngas buffer tank 10 and the second syngas buffer tank 28 respectively.

[0024] An energy storage device 16 is also connected in parallel at the power input port of the water electrolysis device 17.

[0025] The front end of the anaerobic fermentation device 3 is sequentially provided with a first material receiving and conveying device 1 and a pretreatment device 2 in the feeding direction, and the residue outlet of the anaerobic fermentation device 3 is sequentially connected with a dewatering device 13 and an organic fertilizer production device 15, and the dewatering device 13 is further connected with a biogas slurry storage tank 14.

[0026] The anaerobic fermentation device 3 and the methane reforming device 7 are further sequentially connected with a filter desulfurization device 4 and a decarbonization device 5, the decarbonization device 5 is further connected with a biogas storage tank 6, and the biogas storage tank 6 is connected with the methane reforming device 7.

[0027] The methane reforming device 7 and the first synthesis gas buffer tank 10 are further sequentially connected with a heat recovery device 8 and a synthesis gas purification device 9, and the first synthesis gas buffer tank 10 and the methanol synthesis device are further connected with a first synthesis gas compressor 11.

[0028] The front end of the biomass boiler 22 is further connected with a second material receiving and conveying device 21, the biomass boiler 22 and the carbon dioxide capture device 26 are further sequentially connected with a gas-gas heat exchanger 23, a dust and desulfurization device 24 and a condenser 25, and the biomass boiler 22 and the gas-gas heat exchanger 23 are connected with each other.

[0029] The carbon dioxide capture device 26 and the second synthesis gas buffer tank 28 are further connected with a carbon dioxide storage tank 27, and the carbon dioxide storage tank 27 is connected with the decarbonization device 5.

[0030] The first synthesis gas buffer tank 10 and the first methanol synthesis device 12 are connected with the first synthesis gas compressor 11, the second synthesis gas buffer tank 28 and the second methanol synthesis device 30 are connected with the second synthesis gas compressor 29, and the first methanol synthesis device 12 and the second methanol synthesis device 30 are respectively connected with a rectifying device 31, and the rectifying device 31 is connected with a methanol storage tank 32.

[0031] The condenser 25 and the oxygen storage tank 19 are connected with a mixer 20, and the mixer 20 is connected with the gas-gas heat exchanger 23.

[0032] The biomass boiler 22 is further sequentially connected with a steam turbine 33, a condenser 35 and a feed water pump 36, the feed water pump 36 is further connected with the biomass boiler 22, and the steam turbine 33 is further connected with a generator 34.

[0033] The working process of the utility model is as follows:

[0034] The biomass with high water content and easy biodegradation first enters the first material conveying device 1, and then is conveyed to the pretreatment device 2 for pretreatment links such as sorting, crushing, impurity removal, etc. The biomass after the pretreatment enters the anaerobic fermentation device 3 to produce biogas, and the anaerobic fermentation temperature is controlled at about 35°C, and the residence time is 35 days. The biogas produced by the anaerobic fermentation device 3 enters the filter desulfurization device 4, which is used to remove particulate matter and hydrogen sulfide in the biogas. The biogas after the filtration and desulfurization enters the decarbonization device 5 to remove carbon dioxide in the biogas to generate bio-natural gas with a methane volume fraction ≥97%. The removed carbon dioxide enters the carbon dioxide storage tank 27, and the bio-natural gas can enter the bio-natural gas storage tank 6 for temporary storage or directly enter the methane reforming device 7. The methane reforming device 7 generates synthesis gas mainly composed of CO and H2 under the condition of a Ni-based catalyst and at a temperature of 500-700°C. The synthesis gas is recovered by the waste heat recovery device 8 to recover steam, and then enters the synthesis gas purification device 9 to remove impurity gas. The purified synthesis gas enters the first synthesis gas buffer tank 10, and the synthesis gas after being pressurized by the first synthesis gas compressor 11 enters the first methanol synthesis device 12 to prepare crude methanol. At the same time, the residue after the anaerobic fermentation device enters the dehydration device 13 to generate biogas slurry and biogas residue. The biogas slurry enters the biogas slurry storage tank 14 and can be used as liquid fertilizer required for crop production. The biogas residue enters the organic fertilizer production device 15 to produce organic fertilizer which can be sold or returned to crop planting.

[0035] The green electricity generated by the photovoltaic and wind power system is transported to the water electrolysis device 17, and the excess electric energy is stored by the energy storage device 16. When the electric energy output by the photovoltaic and wind power system exceeds the electric energy required by the water electrolysis device 17, the excess electric energy is stored by the energy storage device 16. When the electric energy output by the photovoltaic and wind power system is insufficient, the energy storage device 16 supplements the electric energy required by the water electrolysis device. The electric energy generated by the photovoltaic and wind power system can basically meet the electric energy required by the water electrolysis device. The hydrogen and oxygen generated by the water electrolysis device 17 enter the hydrogen storage tank 18 and the oxygen storage tank 19, respectively. Most of the generated hydrogen is used for synthesis gas required for methanol synthesis and enters the first synthesis gas buffer tank 10 and the second synthesis gas buffer tank 28 for methanol preparation. A small part of the hydrogen enters the anaerobic fermentation device 3 to strengthen the anaerobic fermentation efficiency through hydrogenation, thereby improving the biogas yield, gas production rate and methane content. The produced oxygen is used as a combustion aid for the biomass oxygen-enriched combustion power station, and the excess oxygen can be sold as a product.

[0036] The biomass with high water content and easy to burn enters a biomass boiler 22 through the second material conveying device 21, high-temperature flue gas generated by combustion is cooled through a gas-gas heat exchanger 23, then enters a dust removal and desulfurization device 24 for purification, the purified flue gas enters a condenser 25, part of the purified flue gas enters a CO2 capture device 26, and the other part of the purified flue gas enters the mixer 20 as backflow flue gas, the backflow flue gas and oxygen delivered from the oxygen tank 11 are mixed uniformly in the mixer 20, then enter the gas-gas heat exchanger 23, and the mixed gas is preheated through the gas-gas heat exchanger 23 and then enters the biomass boiler 22, the flue gas passes through the CO2 capture device 26 to obtain high-purity carbon dioxide with a volume fraction of 99.5%, and then enters a carbon dioxide tank 27 for temporary storage, the carbon dioxide and hydrogen enter a second synthesis gas buffer tank 28 for mixing, the mixed synthesis gas enters a second synthesis gas compressor 29 for pressurization, and the pressurized synthesis gas enters a second methanol synthesis device 30.

[0037] The crude methanol prepared by the first methanol synthesis device 12 and the second methanol synthesis device 30 enters a rectification device 31, and green methanol products with a mass fraction of 99.8% are obtained through rectification and are delivered to a methanol tank 32, and the green methanol products can be used as green fuel, green chemical raw materials, green hydrogen storage carriers and the like.

[0038] The green methanol preparation system provided by the utility model realizes efficient and safe utilization of hydrogen energy and consumption of renewable energy through innovation and organic cooperation of multiple industrial technologies such as electrolysis of water, anaerobic fermentation of biomass, oxygen-rich combustion of biomass, CO2 capture and methane reforming.

[0039] The electrolysis of water system produces hydrogen and oxygen, the hydrogen is used for preparing methanol and strengthening anaerobic fermentation, the problem of hydrogen storage and transportation is solved, high-purity oxygen is used for oxygen-rich combustion of biomass for power generation, the combustion efficiency of biomass is improved, the volume fraction of CO2 in flue gas is also improved, SO2 and NOx emissions are effectively reduced, and a good foundation is provided for efficient capture of CO2. X The utility model discloses an electrolysis of water system, a biomass anaerobic fermentation device, a biomass oxygen-rich combustion device, a CO2 capture device, a methane reforming device, a methanol synthesis device and a methanol rectification device are combined, and a green methanol preparation system is formed.

[0040] The utility model discloses a kind of green methanol preparation systems, including biomass pretreatment system, anaerobic fermentation system, oxygen-enriched combustion system and methanol synthesis system, the biomass pretreatment system is connected with anaerobic fermentation system, anaerobic fermentation system is connected with oxygen-enriched combustion system, oxygen-enriched combustion system is connected with methanol synthesis system, different carbon source preparation technology is used for different types of biomass, high moisture content, easy to biodegradable biomass is prepared with CO as main green carbon source by anaerobic fermentation technology, low moisture content, easy to burn biomass is prepared with CO2 as main green carbon source by oxygen-enriched combustion technology to prepare green methanol, while realizing the treatment of biomass resources, high-value green methanol can be produced, reduce the emission of carbon dioxide, realize the goal of green and clean

[0041] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, and the skilled person in the art can make various modifications or equivalent replacements to the utility model within the utility model's essence and protection scope, and such modification or equivalent replacement should be regarded as falling within the protection scope of the technical scheme of the utility model.

Claims

1. A system for preparing methanol by electrolysis of water to produce hydrogen and simultaneous biomass resourceful treatment, characterized in that, The system comprises an anaerobic fermentation device, a methane reforming device, a first synthesis gas buffer tank, a first methanol synthesis device, a biomass boiler, a carbon dioxide capture device, a second synthesis gas buffer tank, a second methanol synthesis device, a methanol storage tank, a water electrolysis device, a hydrogen storage tank and an oxygen storage tank, the anaerobic fermentation device is used for inputting biomass with high moisture content and easy biodegradation, the anaerobic fermentation device, the methane reforming device, the first synthesis gas buffer tank and the first methanol synthesis device are sequentially connected, the biomass boiler is used for inputting biomass with low moisture content and easy combustion, the biomass boiler, the carbon dioxide capture device, the second synthesis gas buffer tank and the second methanol synthesis device are sequentially connected, the methanol storage tank is connected with the first methanol synthesis device and the second methanol synthesis device respectively, the water electrolysis device uses green electricity generated by a photovoltaic and wind power system as power input, the water electrolysis device is sequentially connected with the hydrogen storage tank and the oxygen storage tank respectively, and the oxygen storage tank is connected with the first synthesis gas buffer tank and the second synthesis gas buffer tank respectively.

2. The system for preparing methanol by hydrogen produced from water electrolysis and biomass resource treatment according to claim 1, characterized in that: An energy storage device is further connected in parallel at the power input port of the water electrolysis device.

3. The system for preparing methanol by hydrogen produced from water electrolysis and biomass resource treatment according to claim 1, characterized in that: A first material receiving and conveying device and a pretreatment device are further sequentially arranged at the front end of the inlet of the anaerobic fermentation device according to the feeding direction, a dewatering device and an organic fertilizer production device are further sequentially connected to the residue outlet of the anaerobic fermentation device, and the dewatering device is further connected with a biogas slurry storage tank.

4. The system for preparing methanol by hydrogen produced from water electrolysis and biomass resource treatment according to claim 1, characterized in that: A filter desulfurization device and a decarbonization device are further sequentially connected between the anaerobic fermentation device and the methane reforming device, the decarbonization device is further connected with a biogas storage tank, and the biogas storage tank is connected with the methane reforming device.

5. The system for preparing methanol by hydrogen produced from water electrolysis and biomass resource treatment according to claim 1, characterized in that: A heat recovery device and a synthesis gas purification device are further sequentially connected between the methane reforming device and the first synthesis gas buffer tank, and a first synthesis gas compressor is further connected between the first synthesis gas buffer tank and the methanol synthesis device.

6. The system for preparing methanol by hydrogen produced from water electrolysis and biomass resource treatment according to claim 1, characterized in that: A second material receiving and conveying device is further connected to the front end of the inlet of the biomass boiler, a gas-gas heat exchanger, a dust and desulfurization device and a condenser are further sequentially connected between the biomass boiler and the carbon dioxide capture device, and the biomass boiler and the gas-gas heat exchanger are connected with each other.

7. The system according to claim 4, wherein the system further comprises a biomass pretreatment device. A carbon dioxide storage tank is further connected between the carbon dioxide capture device and the second synthesis gas buffer tank, and the carbon dioxide storage tank is connected with the decarbonization device. 8.The system of claim 1, wherein the system further comprises a biomass pretreatment device. A first synthesis gas compressor is arranged between the first synthesis gas buffer tank and the first methanol synthesis device, a second synthesis gas compressor is arranged between the second synthesis gas buffer tank and the second methanol synthesis device, the first methanol synthesis device and the second methanol synthesis device are respectively connected with a rectification device, and the rectification device is connected with the methanol storage tank.

9. The system for preparing methanol by hydrogen produced from water electrolysis and biomass resource treatment according to claim 6, characterized in that: A mixer is connected between the condenser and the oxygen storage tank, and the mixer is connected with the gas-gas heat exchanger.

10. The system for preparing methanol by hydrogen produced from water electrolysis and biomass resource treatment according to claim 1, characterized in that: The biomass boiler is further sequentially connected with a steam turbine, a condenser and a feed water pump, the feed water pump is further connected with the biomass boiler, and the steam turbine is further connected with a generator.

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