A green production system and production process for efficiently utilizing biomass

Abstract

The application discloses a kind of green production system and production process for efficiently utilizing biomass, and production process includes biomass treatment, methanol synthesis and biological fermentation.Green production system includes biomass treatment module, methanol synthesis module and biological fermentation module;After biomass input system, after the processing of biomass treatment module, enter methanol synthesis module as the raw material of methanol, and the exhaust gas of methanol synthesis module returns to the biomass treatment module for processing new input biomass, and methanol exhaust gas is finally input into biological fermentation module for strain fermentation.The application reduces the pollution caused by livestock manure of livestock industry to the environment, realizes the resource utilization and high-value utilization of biomass.

Description

Technical Field

[0001] This invention belongs to the field of waste utilization technology, specifically relating to a green production system and process for efficiently utilizing biomass. Background Technology

[0002] In recent years, the livestock industry has developed rapidly. Taking cattle farming as an example, with the development of large-scale cattle farms, the problem of manure pollution from these farms has become increasingly prominent. Directly piling up cow manure pollutes the environment and has a negative impact on the cattle farms themselves, affecting the sustainable development of the cattle industry. For example, if cow manure is not treated in a timely manner, it not only occupies the farmers' private land but also pollutes nearby water sources and soil. Due to the large accumulation of cow manure in some large-scale breeding bases, the surrounding surface water and groundwater are polluted to some extent after being washed away by rainwater. Thoroughly solving the problem of manure pollution from the livestock industry is essential for the sustainable and healthy development of the livestock industry. Livestock manure produced by the livestock industry is a usable biomass resource. Harmlessly and fully utilizing these biomass resources is key to preventing and eliminating livestock manure pollution. For example, CN2024107789464 - A methanol production process and system proposes a technical solution for preparing methanol using biomass in conjunction with an electrolysis water hydrogen production process. However, the waste gas and waste generated during the conversion of biomass to formaldehyde are not well treated, and true green production is still not achieved.

[0003] Based on this, the present invention aims to propose a truly efficient green production system and corresponding production process for utilizing biomass, so as to achieve near-zero carbon emissions for the entire process system. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to provide a green production system and process for efficiently utilizing biomass, thereby reducing the environmental pollution caused by livestock manure produced in animal husbandry and realizing the resource utilization and high-value utilization of biomass.

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

[0006] In a first aspect, the present invention provides a production process for efficiently utilizing biomass, comprising:

[0007] S1. Biomass treatment:

[0008] S1.1 Separate the solid and liquid components of biomass to reduce its water content and obtain dehydrated biomass, while simultaneously recovering the residue and liquid.

[0009] S1.2. The dehydrated biomass is dried by methanol purge gas. Water and other volatile organic compounds in the biomass are released and mixed with methanol purge gas to form a mixed gas. The biomass is then crushed to obtain crushed material.

[0010] The pyrolysis gas from some of the biomass is mixed with methanol purge gas to form a mixed gas. The biomass is then crushed to obtain crushed material.

[0011] S1.3 Gasify the crushed material to obtain syngas and recover the gasification slag generated during the gasification process;

[0012] S2, Methanol Synthesis:

[0013] S2.1 The synthesis gas from step S1.3 is converted and purified and then used for methanol synthesis to obtain crude methanol. The methanol purge gas generated during the methanol synthesis process is returned to step S1.2 for use.

[0014] S2.2. Purify the crude methanol to obtain the methanol product;

[0015] S3, Bio-fermentation:

[0016] S3.1. Use the mixed gas generated in step 1.2 for bacterial fermentation culture to obtain crude fermentation product and bacterial protein;

[0017] S3.2. The crude fermentation product is purified to obtain the fermentation product.

[0018] Preferably, the biomass includes agricultural and forestry crops and livestock and poultry manure; more preferably, the biomass includes one or more of straw, sawdust, cow dung, and chicken manure.

[0019] Preferably, in step S1.1, after solid-liquid separation, the water content of the biomass is ≤40%.

[0020] Preferably, in step S1.2, the drying process is performed twice or more.

[0021] More preferably, in step S1.2, the drying process is performed twice;

[0022] After the first drying of biomass, it undergoes a first crushing. The crushed material is then screened, and the material that meets the requirements for gasification feed directly enters the subsequent gasification process. The remaining crushed material undergoes a second drying and a second crushing, and then the material undergoes gasification.

[0023] More preferably, the temperature of the first drying is 80-300℃ and the drying time is 1-5 hours, and the temperature of the second drying is 100-300℃ and the drying time is 1-5 hours.

[0024] Preferably, in step S1.2, the vaporization temperature is 1000-1500℃ and the pressure is 1.0-6.0MPa.

[0025] Preferably, in step S2.1, the methanol synthesis temperature is 150–300°C and the pressure is 10–15 MPa.

[0026] Preferably, in step S3.1, the bacterial strain includes Clostridium aeruginosa, the fermentation temperature is 10-70℃, and the fermentation time is 24-720h.

[0027] In a second aspect, the present invention proposes a green production system for the efficient use of biomass, comprising a biomass processing module, a methanol synthesis module, and a bio-fermentation module;

[0028] After being fed into the system, the biomass is processed by the biomass treatment module and then enters the methanol synthesis module as a raw material for methanol production. The purge gas from the methanol synthesis module is returned to the biomass treatment module to process the newly fed biomass, forming a mixed gas. The mixed gas is then fed into the bio-fermentation module for microbial fermentation.

[0029] Beneficial effects:

[0030] This invention integrates the three major processes of biomass treatment, methanol synthesis, and bio-fermentation into an organic whole, reducing the environmental pollution caused by livestock manure produced in animal husbandry and realizing the resource utilization and high-value utilization of biomass.

[0031] After processing, biomass is used as a raw material for methanol synthesis. The off-gas from methanol synthesis is returned to the biomass processing for reuse. The heat in the off-gas is recovered and utilized in the biomass processing process. The off-gas and some of the dried materials from the biomass are mixed to form a mixed gas that is directly used in the bio-fermentation process as a raw material for microbial culture. Ultimately, co-products of chemicals and microbial proteins are obtained, achieving near-zero carbon emissions for the entire process and providing a new technological path for coal-free chemical industry. Attached Figure Description

[0032] Figure 1 The diagram shown is a schematic representation of the production process of this invention. Detailed Implementation

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0034] This invention proposes a highly efficient biomass production process that uses biomass as a raw material to produce methanol and other products, maximizing the utilization of biomass in product output. The process includes the following steps:

[0035] S1. Biomass treatment:

[0036] S1.1 Separate the solid and liquid components of biomass to reduce its water content and obtain dehydrated biomass, while simultaneously recovering the residue and liquid.

[0037] S1.2. The dehydrated biomass is dried by methanol purge gas. Water and other volatile organic compounds in the biomass are released and mixed with methanol purge gas to form a mixed gas. The biomass is then crushed to obtain crushed material.

[0038] The pyrolysis gas from some of the biomass is mixed with methanol purge gas to form a mixed gas. The biomass is then crushed to obtain crushed material.

[0039] S1.3 Gasify the crushed material to obtain syngas and recover the gasification slag generated during the gasification process;

[0040] S2, Methanol Synthesis:

[0041] S2.1 The synthesis gas from step S1.3 is converted and purified and then used for methanol synthesis to obtain crude methanol. The methanol purge gas generated during the methanol synthesis process is returned to step S1.2 for use.

[0042] S2.2. Purify the crude methanol to obtain the methanol product;

[0043] S3, Bio-fermentation:

[0044] S3.1. Use the mixed gas generated in step 1.2 for bacterial fermentation culture to obtain crude fermentation product and bacterial protein;

[0045] S3.2. The crude fermentation product is purified to obtain the fermentation product.

[0046] In step S1.1, the liquid portion after solid-liquid separation, i.e., the sludge, can be fermented to become liquid organic fertilizer. Taking cow manure as an example, the cow manure water, i.e., the sludge, will generally turn dark red in 3 to 7 days, the odor will decrease, and when the color becomes dark and there is basically no odor, it can be directly extracted as liquid organic fertilizer for crop irrigation.

[0047] In step S1.2, the methanol purge gas temperature is around 160℃, which can effectively dry the moisture in biomass such as cow manure. At this temperature, some volatile gaseous components (such as VOCs, i.e., volatile organic compounds) in the cow manure volatilize and mix with water vapor in the methanol purge gas to form a mixed gas. After the temperature of the mixed gas decreases, it becomes liquid water and dry mixed gas. The dry mixed gas enters the fermentation system for subsequent biological fermentation processes. After purification and other steps, the dry mixed gas enters the fermenter and is used as an energy source by Clostridium aeruginosa, producing methanol or butanol and bacterial protein.

[0048] In step S1.3, the gasification slag can be recycled. Gasification slag can be used as agricultural fertilizer. It contains a large amount of plant nutrients and trace elements, such as phosphorus, potassium, sulfur, iron, and zinc. Returning the ash to the field can increase soil fertility and improve the quality of agricultural products. Biomass ash, i.e., gasification slag, can better increase soil pH, improve soil structure, and significantly promote crop growth and yield. Alternatively, gasification slag can be used for soil improvement and remediation. It is mostly alkaline and contains various nutrients and trace elements. Applying it to soil can alleviate soil acidification and introduce nutrients into the soil. Furthermore, the organic carbon in the gasification slag can not only achieve carbon fixation but also improve soil quality. Gasification slag can also be used for pollutant adsorption. Its loose and porous surface, well-developed pore structure, and large specific surface area give it strong adsorption properties, making it an ideal material for wastewater treatment.

[0049] In step S2.1, the carbon-hydrogen ratio in the synthesis gas is adjusted by steam shift reaction. In actual production, the hydrogen-carbon ratio (H2-CO2) / (CO+CO2) of the feed gas is generally controlled between 2.05 and 2.15. This ratio is crucial for controlling side reactions, protecting catalyst activity, and maintaining suitable reaction conditions. If the hydrogen-carbon ratio is too low, side reactions are likely to increase, catalyst activity will decline rapidly, and carbon deposition may occur. If the hydrogen-carbon ratio is too high, hydrogen accumulation will occur, the inert gas content will increase, the amount of purge gas will increase, and consumption will increase. The crude synthesis gas obtained in step S1.3 has an H2 / CO ratio of approximately 1, which can be adjusted to the required ratio, generally 2:1, through subsequent steam shift reaction. The methanol synthesis process is an existing process and will not be described in detail in this invention.

[0050] The microbial protein obtained in step S3.1 is a high-protein and safe feed ingredient that can replace traditional protein ingredients such as soybean meal and fishmeal. Its application in pig feed, poultry feed, and other animal feeds has made some research progress. For example, adding 6-8% microbial protein to pig concentrate reduces feed costs without affecting product quality.

[0051] This invention enables the efficient production of methanol from biomass, representing a green production process. In this invention, the three main processes—biomass treatment, methanol synthesis, and bio-fermentation—form an integrated whole. The treated biomass serves as the raw material for methanol synthesis, while the purge gas from methanol synthesis is returned to the biomass treatment process. The heat from the purge gas is recovered and utilized during the biomass treatment process. The purge gas, along with some of the dried-out substances from the biomass, is mixed to form a gas mixture that is directly used in the bio-fermentation process as a raw material for microbial culture. Ultimately, this yields co-products of chemicals and microbial protein. All outputs from the entire production process can be used as products, achieving near-zero carbon emissions and providing a new technological path for coal-free chemical engineering.

[0052] In this invention, biomass is preferably made from agricultural and forestry crops such as straw and sawdust, as well as common livestock and poultry manure, with herbivore manure being preferred. The main purpose is to gasify fibers, such as cow manure and horse manure.

[0053] In step S1.1, after solid-liquid separation, the biomass has a moisture content ≤40%, and the remaining moisture can be removed through subsequent drying. Taking cow manure as an example, after solid-liquid separation, a large amount of chlorine in the cow manure is carried out by the waste liquid, effectively reducing the chlorine content in the dehydrated cow manure. If the chlorine content is too high, corrosive hydrogen chloride gas or solution will be formed during subsequent gasification, corroding the gasifier tube wall, requiring the addition of alkaline compounds for neutralization.

[0054] Preferably, the temperature is controlled at 0–50°C and the working pressure is 0.1–5 MPa during solid-liquid separation. For example, the temperature is controlled at 25°C and the working pressure is 0.1 MPa during solid-liquid separation.

[0055] In step S1.2, the number of drying cycles depends on the moisture content of the biomass after dehydration. Preferably, the number of drying cycles is greater than or equal to two. After the first drying of the biomass, it is crushed once and the crushed material is screened so that the biomass powder, such as cow dung powder, has a particle size ≤2mm. The biomass crushed material that meets the requirements for gasification directly enters the subsequent gasification process. The remaining crushed material is dried and crushed a second time, and then the crushed material is gasified.

[0056] Preferably, the temperature for the first drying is 80–300°C, and the drying time is 1–5 hours; the temperature for the second drying is 100–300°C, and the drying time is 1–5 hours. In this invention, the process of drying biomass using methanol purge gas can be achieved by having the methanol purge gas separately introduced into the two drying devices, for example… Figure 1As shown, the methanol off-gas can also first enter the secondary drying equipment and then the primary drying equipment, making fuller use of the waste heat in the methanol off-gas. Furthermore, the high-temperature flue gas and by-product high-temperature steam generated during production can be used for biomass drying, provided the temperature does not exceed 300℃.

[0057] In step S1.2, the vaporization temperature is 1000–1500℃ and the pressure is 1.0–6.0 MPa. For example, the vaporization temperature is 1300℃ and the pressure is 4.0 MPa.

[0058] In the methanol synthesis process, the synthesis temperature is 150–300℃, the pressure is 10–15 MPa, and the catalyst is a copper-based catalyst, represented by Cu-Zn-Cr. The methanol synthesis process is an existing technology and will not be described in detail here.

[0059] This invention mainly uses biomass gasification to form syngas as raw material to prepare methanol, which effectively reduces the pollution of the environment by livestock manure. Therefore, the methanol produced by this invention is green methanol.

[0060] In the bio-fermentation process, the strains include Clostridium aerogenes. The specific Clostridium aerogenes used include, but are not limited to, Clostridium yangi, Clostridium oxyethanol, Clostridium carbon monoxide, and Clostridium yundal. They use carbon monoxide, carbon dioxide, etc. as raw materials to produce a variety of chemicals, such as crude fermentation products like acetic acid, ethanol, butanol, and isopropanol.

[0061] In step S3.1, the fermentation temperature is 10–70℃, and the fermentation time is 24–720 h. It is easy to understand that after multiple drying cycles, the methanol off-gas still retains some residual heat, which can be directly used in the microbial fermentation. Moreover, the mixture of methanol off-gas and the gas produced by the biomass drying serves as the raw material for microbial fermentation, achieving high-value utilization of methanol off-gas and even achieving zero emissions.

[0062] As is easily understood, this invention can achieve fermentation of multiple strains of bacteria, and obtain a variety of fermentation products and microbial proteins.

[0063] Taking cow dung as an example, the collected fresh cow dung is processed through a solid-liquid separator to reduce its moisture content to below 40%, resulting in dehydrated cow dung and a residue-liquid mixture. The residue-liquid mixture removes a large amount of chlorine from the cow dung, effectively reducing its chlorine content. The dehydrated cow dung is then dried once with methanol purge gas and subsequently crushed once. After screening, the cow dung powder that meets the requirements for gasification is directly gasified. The remaining cow dung is dried a second time with methanol purge gas and then crushed a second time. Once it meets the feed requirements of the gasification unit, it is sent to the gasification treatment. The cow dung powder is gasified into syngas, which, after conversion and purification, enters the methanol synthesis system to produce crude methanol. The crude methanol is then distilled to obtain the methanol product. The purge gas generated by the methanol synthesis system is used for the primary and secondary drying of the dehydrated cow dung. The resulting cow dung pyrolysis gas is filtered and sent to a biological fermentation system. Through different fermentation strains, different chemicals are obtained, along with byproduct microbial protein.

[0064] Based on the above production process, this invention also proposes a green production system for efficient utilization of biomass, including a biomass processing module, a methanol synthesis module, and a bio-fermentation module. These three modules are interconnected to form an organic whole. After biomass is input into the system, it is processed by the biomass processing module and then enters the methanol synthesis module as a raw material for methanol production. The purge gas from the methanol synthesis module is returned to the biomass processing module to process newly input biomass, which is then finally input into the bio-fermentation module for microbial fermentation. Thus, this invention achieves efficient utilization of biomass.

[0065] The biomass processing module includes a solid-liquid separation device, a drying device, a crushing device, a gasification device, a conversion device, and a purification device connected in sequence, with a transport device between adjacent devices.

[0066] Taking two drying cycles as an example, the drying device includes a primary drying device and a secondary drying device, and the crushing device includes a primary crushing device and a secondary crushing device. The primary drying device is connected to the primary crushing device, and the secondary drying device is connected to the secondary crushing device. Both the primary and secondary crushing devices are connected to the gasification device, and a screening device is set between the primary and secondary crushing devices.

[0067] The methanol synthesis module includes a methanol synthesis unit and a methanol purification unit connected in sequence. The methanol synthesis unit is connected to the purification unit, and the methanol purge gas from the methanol synthesis unit enters a primary drying unit and a secondary drying unit. The methanol purification unit can be a distillation unit or other suitable purification unit.

[0068] The bio-fermentation module includes a bio-fermentation unit and a product purification unit connected in sequence. Methanol purge gas from the primary drying unit and the secondary drying unit enters the bio-fermentation unit. The product purification unit can be a distillation unit or other suitable purification unit.

[0069] Taking the production of green methanol from cow dung as an example, the following application examples illustrate the specific technical solution, application scenarios, and effects of this invention:

[0070] In Inner Mongolia, cattle sheds typically have red brick floors. The daily (fresh) cow dung is simply collected, diluted with water, and then fed into a screw-type solid-liquid separator for solid-liquid separation. This yields dry cow dung with a moisture content of approximately 40% and a sludge-liquid mixture primarily composed of cow dung, urine, dung residue, and dust. The sludge-liquid mixture is discharged into a waste liquid tank for fermentation for 3-7 days. After fermentation, it is collected by a manure truck, diluted with water, and used as liquid organic fertilizer for farmland irrigation. Dry cow dung with a moisture content of 40% is fed into a drying device and baked with methanol purge gas at 160℃ for 3 hours to obtain cow dung with a moisture content of less than 5%. This is then fed into a crushing device for further crushing. Cow dung powder with a particle size of less than 2mm is screened out and sent to a gasification device. Cow dung powder larger than 2mm is sent to a secondary drying device and baked with methanol purge gas at 160℃ for 2 hours to obtain cow dung with a moisture content of less than 3%. This is then fed into a secondary crushing device for further crushing, and cow dung powder with a particle size of less than 2mm is sent to a gasification device. The cow dung powder is then gasified in a gasifier to obtain… The crude syngas and gasification slag are produced. The gasification slag is an excellent organic fertilizer and soil conditioner, used for backfilling farmland and improving local sandy soil. The hydrogen-to-carbon ratio of the crude syngas is approximately 1:1. After being adjusted to 2.1 by a steam shift system, it is then purified by a purification system to remove sulfur and carbon impurities, resulting in pure syngas. The purified syngas is then fed into a methanol synthesis system, where it undergoes catalytic synthesis to produce crude methanol and spent catalyst. The spent catalyst is periodically recycled and sent for regeneration. The crude methanol is then distilled to obtain methanol with a concentration higher than 99%. The off-gas produced by the methanol synthesis system mainly consists of hydrogen, methane, carbon monoxide, carbon dioxide, water vapor, and nitrogen, with hydrogen accounting for approximately 80% by volume. The off-gas temperature is approximately 160℃, which can be used as a heat source for the drying device to dry the moisture content of cow manure with a moisture content of 40% to below 5%. The resulting water vapor and VOCs mix with the off-gas to form a mixed gas. After entering the biological fermentation system, the mixed gas is first purified to remove impurities and then enters the fermentation tank to provide energy and food for Clostridium ethanolae. After 168 hours of fermentation, crude ethanol and bacterial protein, which are the continuous metabolic products of Clostridium ethanolae, are obtained. The crude ethanol is distilled to obtain an ethanol product with a concentration higher than 95%, and the bacterial protein is purified to obtain a feed-grade bacterial protein product.

[0071] The embodiments provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention, and the descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A production process for efficient utilization of biomass, characterized by, The application relates to a green production system and a production process for efficiently utilizing biomass. S1, biomass treatment: S1.1, solid-liquid separation of biomass to reduce the water content of the biomass, to obtain dewatered biomass, and to recover residue liquid, wherein the biomass is cow dung; S1.2, drying the dewatered biomass by using methanol purge gas, wherein water and other volatile organic substances in the biomass are emitted and mixed with the methanol purge gas to form mixed gas, and then the biomass is crushed to obtain crushed material; S1.2, drying the dewatered biomass by using methanol purge gas, wherein water and other volatile organic substances in the biomass are emitted and mixed with the methanol purge gas to form mixed gas, and then the biomass is crushed to obtain crushed material; S1.3, gasification of the crushed material to obtain synthesis gas, and recovery of gasification residue generated in the gasification process; S2, methanol synthesis: S2.1, the synthesis gas in step S1.3 is used for methanol synthesis after conversion and purification treatment to obtain crude methanol, and methanol purge gas generated in the methanol synthesis process is returned to step S1.2 for use; S2.2, purification of the crude methanol to obtain methanol products; S3, biological fermentation: S3.1, the mixed gas generated in step 1.2 is used for fermentation culture of bacteria, the bacteria are Clostridium autoethanogenum, and fermentation crude products and bacterial proteins are obtained; S3.2, purification of the fermentation crude products to obtain fermentation products.

2. The biomass-efficient production process according to claim 1, wherein, In step S1.1, the water content of the biomass is less than or equal to 40% after solid-liquid separation.

3. The biomass-efficient production process according to claim 2, wherein, In step S1.2, the drying frequency is greater than or equal to two times.

4. The biomass-efficient production process according to claim 3, wherein, In step S1.2, the drying frequency is two times; After the first drying of the biomass, the biomass is crushed once, the once-crushed material is screened, the once-crushed material meeting the gasification furnace requirement is directly sent to subsequent gasification treatment, and the remaining once-crushed material is subjected to second drying and second crushing, and then the second-crushed material is subjected to gasification treatment.

5. The biomass-efficient production process according to claim 4, wherein, The first drying temperature is 80-300 DEG C, the first drying time is 1-5 h, the second drying temperature is 100-300 DEG C, and the second drying time is 1-5 h.

6. The biomass-efficient production process according to any one of claims 1 to 5, characterized in that, In step S1.2, the gasification temperature is 1000-1500 DEG C, and the pressure is 1.0-6.0 MPa.

7. The biomass-efficient production process according to claim 1, wherein, In step S2.1, the methanol synthesis temperature is 150-300 DEG C, and the pressure is 10-15 MPa.

8. The biomass-efficient production process according to claim 1, wherein, The Clostridium autoethanogenum is one or more of Clostridium ljungdahli, Clostridium autoethanogenum, Clostridium carboxidivorans and Clostridium nealonicum; The fermentation temperature is 10-70 DEG C, and the fermentation time is 24-720 h.

9. A green production system that efficiently utilizes biomass, characterized by, The green production system is a device suitable for the production process for efficiently utilizing biomass according to any one of claims 1-8, and comprises a biomass treatment module, a methanol synthesis module and a biological fermentation module; After the biomass is input into the system, the biomass is treated by the biomass treatment module, and then enters the methanol synthesis module as raw material for methanol production; the methanol synthesis module returns the purge gas to the biomass treatment module for treating newly input biomass to form mixed gas, and the mixed gas is finally input into the biological fermentation module for bacteria fermentation. The biomass treatment module comprises, which are connected in sequence, a solid-liquid separation device, a drying device, a crushing device, a gasification device, a shift device and a purification device, wherein a conveying device is arranged between adjacent devices, the drying device comprises a primary drying device and a secondary drying device, the crushing device comprises a primary crushing device and a secondary crushing device, the primary drying device is connected with the primary crushing device, the secondary drying device is connected with the secondary crushing device, the primary crushing device and the secondary crushing device are both connected with the gasification device, and a screening device is arranged between the primary crushing device and the secondary crushing device; The methanol synthesis module comprises, which are connected in sequence, a methanol synthesis device and a methanol purification device, the methanol synthesis device is connected with the purification device, and methanol purge gas of the methanol synthesis device enters the primary drying device and the secondary drying device; The biological fermentation module comprises, which are connected in sequence, a biological fermentation device and a product purification device, and the methanol purge gas in the primary drying device and the secondary drying device enters the biological fermentation device.

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