Biomass gas and green liquid fuel production method and system

Abstract

The invention provides a biomass gas and green liquid fuel production method and system. The production method of the fuel gas and the green liquid fuel comprises the following steps: S1, carrying out anaerobic fermentation on biodegradable wastes to obtain biomass fuel gas and solid biogas residues; s2, gasifying the high-calorific-value waste to obtain synthesis gas; and S3, purifying the synthesis gas, and then carrying out alcohol synthesis and / or oil synthesis on the purified synthesis gas and green hydrogen to obtain an alcohol raw material / fuel and / or sustainable aviation fuel. According to the biomass fuel gas and green liquid fuel production method and system, biomass waste in a regional range can be treated in a full quantification mode through reasonable configuration, meanwhile, green hydrogen is consumed through energy supply of the system to produce the green liquid fuel, and the purpose that long-distance transportation is easy after distributed fuel gas is converted into the liquid fuel is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass resource utilization, and in particular to a method and system for producing biomass gas and green liquid fuel. Background Art

[0002] Biomass raw materials mainly include various urban and rural organic wastes such as crop straws, livestock farm wastes, domestic garbage, and industrial organic wastewater. The combustible gas mainly containing methane produced by thermochemical conversion or biochemical conversion of biomass is called biogas. Biogas includes two categories. One is the combustible gas mainly composed of carbon monoxide, hydrogen, nitrogen, etc. produced by incomplete combustion and pyrolysis of biomass under high temperature and oxygen-deficient conditions, which is called gasification gas; the other is the combustible gas mainly composed of methane and carbon dioxide produced by the decomposition of biomass by anaerobic bacteria under anaerobic conditions, which is called biogas. As a typical distributed energy production technology, biogas technology is an important means of treating organic wastes; the utilization mode of biogas is flexible, and it can be directly used for power generation, heating, or coupled power generation and purification of biomethane, etc.

[0003] Green methanol is a low-carbon, oxygen-containing fuel with characteristics such as high combustion efficiency, clean emissions, and renewable green attributes. It is a world-recognized clean fuel. If clean energy is used to produce green methanol to replace traditional fossil fuels, it can significantly reduce the carbon emissions generated by fossil fuels and promote the technological upgrading of related industrial chains. Therefore, the development of green methanol is one of the important measures to achieve the "carbon neutrality" goal. Compared with traditional aviation fuels, sustainable aviation fuel (SAF) can reduce carbon emissions by up to 80-85%. As one of the key areas for the aviation industry to achieve the "dual carbon" goal, the aviation industry has received increasing attention. Compared with other industries, the emission reduction solutions and paths in the aviation industry are relatively limited, and the emission reduction is difficult, so it is called one of the "difficult-to-reduce emissions" areas. SAF has characteristics such as high calorific value and zero emissions. Using SAF does not require large-scale transformation of existing infrastructure, aircraft engines, and operation management systems, thus significantly reducing the emission reduction cost and bringing new possibilities and prospects for emission reduction in the aviation industry.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and system for producing biomass gas and green liquid fuel, which can fully quantify and process biomass wastes within the regional scope through reasonable configuration, and at the same time produce green liquid fuel by consuming green hydrogen through self-supply, achieving the goal that the converted distributed gas is easy to transport over long distances.

[0006] The present invention provides a method for producing biomass gas and green liquid fuel, including the following steps:

[0007] S1: Anaerobically ferment the biodegradable waste to obtain biogas and solid biogas residues.

[0008] S2: Gasify the high-calorific waste to obtain syngas.

[0009] S3: Purify the syngas, and then carry out alcohol synthesis and / or oil synthesis with green hydrogen to obtain alcohol raw materials / fuels and / or sustainable aviation fuels.

[0010] In step S1, there is no strict restriction on the type of biodegradable waste, including but not limited to green straws, farm waste, organic domestic waste, kitchen waste, industrial organic wastewater, etc.; control the concentration (i.e., mass content) of the biodegradable waste to be 25 - 40%.

[0011] The temperature of anaerobic fermentation is 40 - 55°C, and the time of anaerobic fermentation is 1 - 4 weeks. In one embodiment, mesophilic anaerobic fermentation can be adopted, the temperature of mesophilic anaerobic fermentation can be 40 - 45°C, and the time of mesophilic anaerobic fermentation can be 3 - 4 weeks; in another embodiment, thermophilic anaerobic fermentation can be adopted, the temperature of thermophilic anaerobic fermentation can be 50 - 55°C, and the time of thermophilic anaerobic fermentation can be 1 - 2 weeks.

[0012] Furthermore, during the anaerobic fermentation process, the leachate formed by anaerobic fermentation can be recycled and sprayed; the recycled spraying includes: spraying 15 - 17 times a day in the early stage of anaerobic fermentation, spraying 7 - 9 times a day in the middle stage of anaerobic fermentation, spraying 3 - 5 times a day in the later stage of anaerobic fermentation, and not spraying in the last 1 - 3 days of anaerobic fermentation; the spraying volume each time is 4 - 6m 3 。

[0013] In addition, an independent methane production tank can be set; the leachate formed by anaerobic fermentation is sent to the methane production tank for methane production, and the methane production time can be 20 - 28h; the leachate after methane production is recycled and sprayed.

[0014] In the above anaerobic fermentation, for every m 3 The volumetric gas production rate of anaerobic fermentation of biodegradable waste is 2.0 - 4.0m 3 ; the methane concentration in the biogas ≥ 70%; the main components of the biogas are as follows: methane 70 - 75%, carbon dioxide 24 - 29%. The above anaerobic fermentation has low water consumption, less secondary pollution, high gas production rate, high quality of biogas, and can be equipped with a biogas combined heat and power unit (CHP) later to provide electricity and heat for the overall system; at the same time, the solid biogas residues produced by anaerobic fermentation have a low moisture content, do not require solid-liquid separation, and can be directly used for the production of carbon-based fertilizers, and then used for the planting of agriculture, forestry and energy crops.

[0015] In step S2, the types of high-calorie waste are not strictly restricted, including but not limited to dry yellow straws, pruned leaves, wood processing waste, waste tires, forestry waste, etc.

[0016] Gasification is carried out using a gasifier, such as a fluidized bed or a circulating fluidized bed gasifier. The height-to-diameter ratio of the gasifier can be 22 - 24. At the same time, pure oxygen and steam can be used as gasification agents for gasification. The pure oxygen can be the pure oxygen produced by electrolyzing water using wind-solar green electricity. The consumption of pure oxygen per ton of high-calorie waste is 0.2 - 0.3 tons, and the consumption of steam is 0.6 - 0.7 tons. The gasification temperature can be 750 - 850 °C, and the gasification efficiency is controlled to be ≥ 75%, and the carbon conversion rate is ≥ 95%.

[0017] The calorific value of the syngas produced by the above gasification is 8500 - 9000 kJ / m 3 ; The main components of the syngas are: methane 8 - 10%, hydrogen 20 - 23%, carbon monoxide 46 - 47%; the tar content in the syngas is ≤ 1.8 g / m 3 ; The biochar / ash produced by gasification can be directly used to produce carbon-based fertilizer after being mixed with solid biogas residues.

[0018] In step S3, purification includes: successively removing tar, performing syngas conversion, and desulfurizing and decarbonizing the syngas to form clean syngas. The clean syngas can be used for alcohol synthesis and / or oil synthesis with green hydrogen, and various green liquid fuels such as alcohol raw materials / fuels like methanol and polyols and sustainable aviation fuel (SAF) are produced by Fischer-Tropsch synthesis using different types of catalysts. The green hydrogen can be the green hydrogen produced by electrolyzing water using wind-solar green electricity.

[0019] The present invention also provides a biomass gas and green liquid fuel production system for implementing the above biomass gas and green liquid fuel production method; the biomass gas and green liquid fuel production system includes a raw material pretreatment system, an anaerobic fermentation system, a gasifier, a purification system, a green electricity system, an alcohol synthesis system, and / or an oil synthesis system. The anaerobic fermentation system is connected to the biodegradable waste outlet of the raw material pretreatment system, the gasifier is connected to the high-calorie waste outlet of the raw material pretreatment system, the purification system is connected to the syngas outlet of the gasifier, and the alcohol synthesis system and / or the oil synthesis system are respectively connected to the purification system and the green electricity system.

[0020] Furthermore, the anaerobic fermentation system includes an anaerobic fermentation tank, a methane production tank, and a leachate storage tank. The methane production tank is connected to the leachate outlet of the anaerobic fermentation tank, the leachate storage tank is connected to the leachate outlet of the methane production tank, and the leachate storage tank is connected to the reflux spray port of the anaerobic fermentation tank.

[0021] Furthermore, the purification system includes a tar removal device, a syngas conversion device, and a desulfurization and decarbonization device arranged in sequence.

[0022] The production method and system of biomass gas and green liquid fuel of the present invention can cover the entire field of biomass resource utilization. For biodegradable waste, anaerobic fermentation process is used to produce biomass biogas, and for high calorific value waste, gasification process is used to produce biomass syngas. The solid residues remaining from anaerobic fermentation and gasification can be used to produce carbon-based fertilizers; a part of the biomass gas produced by the system directly enters the biogas combined heat and power unit (CHP) to provide electricity and heat energy for the system, and the remaining part can be purified through processes such as conversion, supplemented with green hydrogen, and used to produce various green liquid fuels such as methanol, polyols, and SAF by Fischer-Tropsch synthesis using different types of catalysts. The above production method and system can fully quantify the treatment of biomass waste within the regional scope through reasonable configuration, and at the same time consume green hydrogen through self-supplying energy to produce green liquid fuels, achieving the goal of easy long-distance transportation after the conversion of distributed gas to liquid fuels. Brief Description of the Drawings

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of the production process of biomass gas and green liquid fuel;

[0025] Figure 2 It is a schematic diagram of the structure of the production system of biomass gas and green liquid fuel.

[0026] Description of the Reference Numerals:

[0027] 1: Raw material pretreatment system; 2: Anaerobic fermentation system; 3: Biogas storage tank; 4: Biogas combined heat and power unit; 5: Solid biogas residue storage tank; 6: Carbon-based fertilizer storage tank; 7: Gasifier; 8: Coke removal device; 9: Syngas conversion device; 10: Desulfurization and decarbonization device; 11: Clean syngas storage tank; 12: Biochar / ash storage tank; 13: Green power system; 14: Pure oxygen storage tank; 15: Steam storage tank; 16: Green hydrogen storage tank; 17: Alcohol synthesis system; 18: Oil synthesis system; 19: Methanol storage tank; 20: Polyol storage tank; 21: SAF storage tank. Detailed Embodiments

[0028] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms also include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Example 1

[0032] Combined with Figure 1 As shown, the production method of biomass gas and green liquid fuel in this embodiment processes 200 t / d of urban and rural organic waste, 300 t / d of agricultural dry yellow straws, and 100 t / d of forestry waste within the treatment area. The specific steps are as follows:

[0033] 1. Anaerobic fermentation

[0034] Use a garage-type dry fermentation to treat urban and rural organic waste (i.e., biodegradable waste), control the concentration of urban and rural organic waste at 40%, and use a high-temperature anaerobic fermentation method for dry fermentation. Control the temperature of the high-temperature anaerobic fermentation at 55°C and the time of the high-temperature anaerobic fermentation at 7 days.

[0035] During the above high-temperature anaerobic fermentation process, the leachate formed by the high-temperature anaerobic fermentation is subjected to reflux spraying; the reflux spraying includes: spraying 16 times on the first day of the high-temperature anaerobic fermentation, spraying 8 times per day on the 2nd - 4th days of the high-temperature anaerobic fermentation, spraying 4 times per day on the 5th - 6th days of the high-temperature anaerobic fermentation, and no spraying on the 7th day of the high-temperature anaerobic fermentation; the spraying volume each time is 5m 3 .

[0036] Send the leachate formed by the high-temperature anaerobic fermentation to a methane production tank for methane production. The methane production time is 24 h, and the leachate after methane production is subjected to reflux spraying.

[0037] In the above high-temperature anaerobic fermentation, the volumetric gas production rate of anaerobic fermentation of every m 3 biodegradable waste is 4.0 m 3 , and 24,000 m of biomass gas is produced daily 3, the composition of the biomass gas is as follows: methane 75%, carbon dioxide 24%, and others 1%. The subsequent supporting biogas combined heat and power unit (CHP) for the biomass gas provides electricity and heat for the overall system. The high-temperature anaerobic fermentation produces 50 tons of solid biogas residue per day. The solid biogas residue does not require solid-liquid separation and can be directly used for the production of carbon-based fertilizers for the planting of agriculture, forestry, and energy crops.

[0038] 2. Gasification

[0039] The circulating fluidized bed gasifier is used to gasify agricultural dry yellow straws and forestry waste (collectively referred to as high-calorific value waste). The height of the gasifier is 15 m, and the diameter is 0.65 m.

[0040] During gasification, pure oxygen and steam are used as gasifying agents. The pure oxygen is produced by electrolyzing water with wind and solar green electricity. The consumption of pure oxygen per ton of high-calorific value waste is 0.24 tons, and the steam consumption is 0.65 tons. The gasification temperature can be 850 °C, and the gasification efficiency is controlled to be ≥ 75%, and the carbon conversion rate is ≥ 95%.

[0041] The calorific value of the syngas produced by gasification is 9000 kJ / m 3 ; the composition of the syngas is: methane 10%, hydrogen 20%, carbon monoxide 47%, carbon dioxide 22%, and others 1%; the tar content in the syngas is 1.8 g / m 3 ; the daily production of syngas is 440,000 m 3 , and 20 tons of biochar / ash are produced daily. The produced biochar / ash can be mixed with the above-mentioned solid biogas residue to produce 60 tons of carbon-based fertilizers daily.

[0042] 3. Alcohol and oil synthesis

[0043] After the syngas is de-tarred, syngas shifted, and desulfurized and decarbonized, clean syngas is formed. 20 tons of green hydrogen are added daily, and various green liquid fuels such as methanol, polyols, and sustainable aviation fuel (SAF) are produced by Fischer-Tropsch synthesis using conventional different types of catalysts. Finally, 20,000 tons of methanol, 10,000 tons of polyols, and 0.5 million tons of SAF are produced annually.

[0044] Example 2

[0045] In the production method of biomass gas and green liquid fuel of this example, 100 t / d of urban and rural organic waste, 100 t / d of livestock waste, 50 t / d of green straws, 250 t / d of dry yellow straws, and 50 t / d of wood processing waste are processed within the treatment area. The specific steps are as follows:

[0046] 1. Anaerobic fermentation

[0047] Use dry fermentation to treat urban and rural organic waste, livestock waste, and green straw (collectively referred to as biodegradable waste), control the concentration of biodegradable waste at 25%, and use medium-temperature anaerobic fermentation for dry fermentation. Control the temperature of medium-temperature anaerobic fermentation at 40°C, and the time of high-temperature anaerobic fermentation at 28 days.

[0048] During the above medium-temperature anaerobic fermentation process, the leachate formed by medium-temperature anaerobic fermentation is refluxed and sprayed; the reflux spraying includes: spraying 16 times on the 1st - 3rd day of medium-temperature anaerobic fermentation, spraying 8 times per day on the 4th - 21st day of medium-temperature anaerobic fermentation, spraying 4 times per day on the 5th - 25th day of medium-temperature anaerobic fermentation, and no spraying on the 26th - 28th day of medium-temperature anaerobic fermentation; the spraying volume each time is 5m 3 。

[0049] Send the leachate formed by medium-temperature anaerobic fermentation to the methane production tank for methane production. The methane production time is 24h, and the leachate after methane production is refluxed and sprayed.

[0050] In the above medium-temperature anaerobic fermentation, the volumetric gas production rate of anaerobic fermentation of each m 3 of biodegradable waste is 2.0m 3 , the daily production of biomass gas is 28000m 3 , and the composition of the biomass gas is as follows: methane 70%, carbon dioxide 29%, others 1%. The subsequent supporting biogas combined heat and power unit (CHP) of the biomass gas provides electricity and heat for the overall system. The medium-temperature anaerobic fermentation produces 40 tons of solid biogas residue per day. The solid biogas residue does not require solid-liquid separation and can be directly used for the production of carbon-based fertilizers for the planting of agriculture, forestry, and energy crops.

[0051] 2. Gasification

[0052] Use a circulating fluidized bed gasifier to gasify dry yellow straw and wood processing waste (collectively referred to as high-calorific value waste). The height of the gasifier is 15m, and the diameter is 0.65m.

[0053] During gasification, pure oxygen and steam are used as gasifying agents for gasification. The pure oxygen is produced by electrolyzing water using wind, solar, and green electricity. The consumption of pure oxygen per ton of high-calorific value waste is 0.24 tons, and the steam consumption is 0.65 tons; the gasification temperature can be 750°C, control the gasification efficiency ≥ 75%, and the carbon conversion rate ≥ 95%.

[0054] The calorific value of the syngas produced by gasification is 8500kJ / m 3 ; the composition of the syngas is: methane 8%, hydrogen 23%, carbon monoxide 46%, carbon dioxide 22%, others 1%. The tar content in the syngas is 1.7g / m 3 ; the daily production of syngas by gasification is 360000m 3, 15 tons of biochar / ash are produced daily, and the produced biochar / ash can be mixed with the above-mentioned solid biogas residue to produce 50 tons of carbon-based fertilizer daily.

[0055] 3. Alcohol and oil synthesis

[0056] The syngas is formed into clean syngas after coke removal, syngas conversion, desulfurization and decarbonization. 15 tons of green hydrogen are added daily, and various green liquid fuels such as methanol, polyols and sustainable aviation fuel (SAF) are produced by Fischer-Tropsch synthesis using conventional different types of catalysts. Finally, 15,000 tons of methanol, 8,000 tons of polyols and 4,000 tons of SAF are produced annually.

[0057] Control Example 1

[0058] Except that the leachate formed during the high-temperature anaerobic fermentation in Step 1 is not refluxed and sprayed, the rest is the same as in Example 1.

[0059] In the high-temperature anaerobic fermentation, the volumetric gas production rate of biodegradable waste anaerobic fermentation in this control example is 0.5 m 3 , and the composition of the biogas is as follows: methane 50%, carbon dioxide 49%, and others 1%. 3

[0060] Control Example 2

[0061] Except that air is used as the gasifying agent in Step 2 and the air consumption per ton of high-calorific value waste is 100 tons, the rest is the same as in Example 1.

[0062] The calorific value of the syngas produced by gasification in this control example is 4200 kJ / m 3 ; the composition of the syngas is: methane 2%, hydrogen 12%, carbon monoxide 21%, carbon dioxide 13%, nitrogen 51%, and others 1%. The tar content in the syngas is 5 g / m 3 .

[0063] Example 3

[0064] Combined Figure 2 As shown, this example provides a biomass gas and green liquid fuel production system for the production methods of Examples 1 and 2.

[0065] Specifically, the biomass gas and green liquid fuel production system includes a raw material pretreatment system 1, an anaerobic fermentation system 2, a gasifier 7, a purification system, a green power system 13, an alcohol synthesis system 17 and an oil synthesis system 18. The anaerobic fermentation system 2 is connected to the biodegradable waste outlet of the raw material pretreatment system 1, the gasifier 7 is connected to the high-calorific value waste outlet of the raw material pretreatment system 1, the purification system is connected to the syngas outlet of the gasifier 7, and the alcohol synthesis system 17 and the oil synthesis system 18 are respectively connected to the purification system and the green power system 13.

[0066] The raw material pretreatment system 1 is mainly used for pretreating biomass raw materials. The pretreatment methods include, but are not limited to, classifying biomass raw materials and adjusting the moisture content of biomass raw materials, etc. Biomass raw materials include biodegradable waste such as green straws, farm waste, organic domestic waste, kitchen waste, industrial organic wastewater, etc., and high calorific value waste such as dry yellow straws, pruning leaves, wood processing waste, waste tires, forestry waste, etc. The concentration (i.e., mass content) of biodegradable waste can be controlled at 25 - 40%.

[0067] The biodegradable waste then enters the anaerobic fermentation system 2 for anaerobic fermentation. The anaerobic fermentation system 2 can include an anaerobic fermentation tank, a methane production tank, and a leachate storage tank. The methane production tank is connected to the leachate outlet of the anaerobic fermentation tank. The leachate storage tank is connected to the leachate outlet of the methane production tank, and the leachate storage tank is connected to the reflux spray port of the anaerobic fermentation tank. Anaerobic fermentation is carried out in the anaerobic fermentation tank. The temperature of anaerobic fermentation can be 40 - 55°C, and the time of anaerobic fermentation can be 1 - 4 weeks. Anaerobic fermentation can adopt medium - temperature anaerobic fermentation. The temperature of medium - temperature anaerobic fermentation can be 40 - 45°C, and the time of medium - temperature anaerobic fermentation can be 3 - 4 weeks; Anaerobic fermentation can also adopt high - temperature anaerobic fermentation. The temperature of high - temperature anaerobic fermentation can be 50 - 55°C, and the time of high - temperature anaerobic fermentation can be 1 - 2 weeks.

[0068] During the anaerobic fermentation process, the leachate formed by anaerobic fermentation is subjected to reflux spraying; The reflux spraying includes: spraying 15 - 17 times a day in the early stage of anaerobic fermentation, spraying 7 - 9 times a day in the middle stage of anaerobic fermentation, spraying 3 - 5 times a day in the late stage of anaerobic fermentation, and no spraying is carried out in the last 1 - 3 days of anaerobic fermentation. In addition, the leachate formed by anaerobic fermentation is sent to the methane production tank for methane production. The methane production time can be 20 - 28h; The leachate after methane production is subjected to reflux spraying.

[0069] The biogas and solid biogas residues generated by the anaerobic fermentation system 2 are stored through a biogas storage tank 3 and a solid biogas residue storage tank 5 respectively. The biogas storage tank 3 can be connected to a biogas combined heat and power unit 4 (CHP) to provide electricity and heat for the overall system. The solid biogas residue storage tank 5 can be connected to a carbon - based fertilizer storage tank 6 for the planting of agriculture, forestry and energy crops.

[0070] High-calorie waste enters the gasifier 7 for gasification. The gasifier 7 can adopt a fluidized bed or a circulating fluidized bed gasifier, and the height-diameter ratio of the gasifier 7 can be 22 - 24. Pure oxygen and steam are used as gasifying agents for gasification. The pure oxygen and steam can be the pure oxygen and steam produced by electrolyzing water in the green power system 13, and the pure oxygen and steam can be stored through the pure oxygen storage tank 14 and the steam storage tank 15. During gasification, the consumption of pure oxygen per ton of high-calorie waste is 0.2 - 0.3 tons, and the consumption of steam is 0.6 - 0.7 tons; the gasification temperature can be 750 - 850 °C, and the gasification efficiency is controlled to be ≥75%, and the carbon conversion rate is ≥95%. The calorific value of the syngas produced by the gasifier 7 is 8500 - 9000 kJ / m 3 ; the tar content in the syngas is ≤1.8 g / m 3 ; the biochar / ash produced by the gasifier 7 can be stored through the biochar / ash storage tank 12. The biochar / ash storage tank 12 is connected to the biochar-based fertilizer storage tank 6, and the biochar / ash is mixed with solid biogas residue to produce biochar-based fertilizer.

[0071] The purification system includes a de-tarring device 8, a syngas conversion device 9, and a desulfurization and decarbonization device 10 arranged in sequence. The syngas is purified by the purification system to form clean syngas, and the clean syngas is stored in the clean syngas storage tank 11. The clean syngas in the clean syngas storage tank 11 and the green hydrogen produced by the green power system 13 then carry out alcohol synthesis and / or oil synthesis. The green hydrogen is stored through the green hydrogen storage tank 16. The clean syngas and the green hydrogen use different types of catalysts for Fischer-Tropsch synthesis to produce alcohol raw materials / fuels such as methanol and polyols, and various green liquid fuels such as sustainable aviation fuel (SAF). The produced methanol, polyols, and SAF are stored through the methanol storage tank 19, the polyol storage tank 20, and the SAF storage tank 21 respectively.

[0072] The biomass gas and green liquid fuel production system of this embodiment can cover the entire field of biomass resource utilization. For biodegradable waste, an anaerobic fermentation process is used to produce biomass biogas. For high-calorie waste, a gasification process is used to produce biomass syngas. The solid residues remaining from anaerobic fermentation and gasification can be used to produce biochar-based fertilizer; a part of the biomass gas produced by the system directly enters the biogas combined heat and power unit to provide electricity and heat for the system, and the remaining part can be purified through conversion and other processes, supplemented with green hydrogen, and use different types of catalysts for Fischer-Tropsch synthesis to produce various green liquid fuels such as methanol, polyols, and SAF. The above production system can fully quantify the treatment of biomass waste within the regional scope through reasonable configuration, and at the same time consume green hydrogen through its own energy supply to produce green liquid fuels, achieving the goal that distributed gas is easy to transport over long distances after being converted into liquid fuel.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for producing biomass gas and green liquid fuel, characterized in that: The steps include: S1: Anaerobic fermentation of biodegradable waste to obtain biomass gas and solid biogas residue; S2: Gasifying high calorific value waste to obtain synthesis gas; S3: The synthesis gas is purified and then subjected to alcohol synthesis and / or oil synthesis with green hydrogen to obtain alcohol raw materials / fuels and / or sustainable aviation fuels.

2. The method for producing biomass gas and green liquid fuel according to claim 1, characterized in that: Biodegradable waste includes at least one of green straw, farm waste, organic domestic waste, kitchen waste and industrial organic wastewater; high calorific value waste includes at least one of dry yellow straw, pruned leaves, wood processing waste, discarded tires and forestry waste.

3. The method for producing biomass gas and green liquid fuel according to claim 1, characterized in that: The concentration of biodegradable waste is 25-40%; the temperature of anaerobic fermentation is 40-55° C., and the time of anaerobic fermentation is 1-4 weeks.

4. The method for producing biomass gas and green liquid fuel according to claim 1, characterized in that: During the anaerobic fermentation process, the leachate formed by anaerobic fermentation is sprayed backflow; the backflow spraying includes: spraying 15-17 times a day in the early stage of anaerobic fermentation, spraying 7-9 times a day in the middle stage of anaerobic fermentation, spraying 3-5 times a day in the late stage of anaerobic fermentation, and no spraying in the last 1-3 days of anaerobic fermentation; the spraying volume of each spray is 4-6m 3 .

5. The method for producing biomass gas and green liquid fuel according to claim 1, characterized in that: per m 3 The volumetric gas production rate of anaerobic fermentation of biodegradable waste is 2.0-4.0m 3 ; The methane concentration in biomass gas is ≥70%.

6. The method for producing biomass gas and green liquid fuel according to claim 1, characterized in that: A gasifier is used for gasification, and the height-to-diameter ratio of the gasifier is 22-24; pure oxygen and water vapor are used as gasifying agents for gasification, and the amount of pure oxygen used per ton of high calorific value waste is 0.2-0.3 tons, and the amount of water vapor used is 0.6-0.7 tons; the gasification temperature is 750-850°C, the gasification efficiency is ≥75%, and the carbon conversion rate is ≥95%.

7. The method for producing biomass gas and green liquid fuel according to claim 1, characterized in that: The calorific value of synthesis gas is 8500-9000kJ / m 3 ; Tar content in synthesis gas ≤ 1.8g / m 3 .

8. A biomass gas and green liquid fuel production system, characterized in that: Used to implement the biomass gas and green liquid fuel production method described in any one of claims 1-7; the biomass gas and green liquid fuel production system includes a raw material pretreatment system, an anaerobic fermentation system, a gasifier, a purification system, a green electricity system, an alcohol synthesis system and / or an oil synthesis system, the anaerobic fermentation system is connected to the biodegradable waste outlet of the raw material pretreatment system, the gasifier is connected to the high calorific value waste outlet of the raw material pretreatment system, the purification system is connected to the synthesis gas outlet of the gasifier, and the alcohol synthesis system and / or the oil synthesis system are respectively connected to the purification system and the green electricity system.

9. The biomass gas and green liquid fuel production system according to claim 8, characterized in that: The anaerobic fermentation system includes an anaerobic fermentation tank, a methanogen tank and a leachate storage tank. The methane generator tank is connected to the leachate outlet of the anaerobic fermentation tank, the leachate storage tank is connected to the leachate outlet of the methane generator tank, and the leachate storage tank is connected to the reflux spray port of the anaerobic fermentation tank.

10. The biomass gas and green liquid fuel production system according to claim 8, characterized in that: The purification system includes a decoking device, a synthesis gas conversion device and a desulfurization and decarbonization device which are arranged in sequence.

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