Biomethanol production process and system without hydrogen supplementation

Abstract

The present invention relates to the technical field of biomethanol, a biomethanol manufacturing process and system without hydrogen supplementation, the process comprising pyrolysis, gasification, hydrogen production and synthesis steps; pyrolysis: biomass raw materials are indirectly heated in an oxygen-free atmosphere to produce mixed gas, mixed liquid of organic acid and tar, and residual carbon solid; gasification: the mixed liquid and residual carbon solid are directly heated in an oxygen-deficient atmosphere to produce gaseous products, and further produce residual carbon solid; hydrogen production: the gaseous products and residual carbon solid are controlled to react at a temperature in an oxygen-free or oxygen-deficient atmosphere, and the residual carbon solid reacts with water vapor in the gaseous products to produce hydrogen; synthesis: the synthesis gas is purified and synthesized to obtain finished methanol. The hydrogen-carbon ratio in the synthesis gas of the present invention is higher than the basic requirement for methanol synthesis, the molar ratio of hydrogen to carbon monoxide is greater than 2, and hydrogen does not need to be supplemented from the outside, thereby avoiding the equipment investment and hydrogen production cost of electrolyzing water to produce hydrogen.

Description

Technical Field

[0001] The present invention relates to the technical field of biomethanol, and in particular to a biomethanol manufacturing process and system without the need for hydrogen supplementation. Background Art

[0002] Methanol produced from biomass as raw material is called biomethanol. It is a new liquid energy with zero carbon emissions. It can directly replace petrochemical energy and can also be converted into hydrogen energy through reforming hydrogen production.

[0003] The production of biomethanol using biomass as raw material can be divided into two major process stages: the first process stage uses thermochemical means such as pyrolysis or gasification to convert solid biomass into synthesis gas mainly composed of hydrogen and carbon monoxide; the second process stage uses Fischer-Tropsch synthesis or similar processes to synthesize methanol from synthesis gas at a certain temperature and pressure. The key lies in the first process stage, that is, the production of high-quality synthesis gas, because the second process stage is mature and difficult to innovate. High-quality synthesis gas needs to meet the following three requirements:

[0004] 1. The ratio of hydrogen to carbon monoxide meets the basic requirements for methanol synthesis (the molar ratio of hydrogen to carbon monoxide is greater than 2);

[0005] 2. The calorific value of the synthesis gas should be high (not less than 2000 kcal / kg) to ensure a sufficiently high chemical energy conversion rate;

[0006] 3. Most of the carbon in the raw materials (not less than 90%) must be converted into carbon monoxide in the synthesis gas.

[0007] Only biomethanol produced from synthesis gas that meets the above three basic requirements can be economically comparable to methanol produced from coal. Otherwise, it will be difficult to be competitive in the market.

[0008] The current biomass gasifiers at home and abroad are classified into fixed bed gasifiers, moving bed gasifiers, fluidized bed gasifiers, entrained bed gasifiers and cyclone separation bed gasifiers according to the type of gasification reactor. Although there are many categories, almost no gasifier can meet the above three conditions at the same time, mainly manifested in:

[0009] 1) The hydrogen content in biomass raw materials is seriously insufficient. Even if all the conversion is carried out in the simple gasification process, the hydrogen-to-carbon ratio condition for synthesizing methanol cannot be met;

[0010] 2) The syngas produced by simple biomass gasification contains a large amount of impurity gases such as water vapor, carbon dioxide and nitrogen, and its calorific value is only about 1000kcal / kg;

[0011] 3) Biomass gasifiers generally have about 30% residual carbon, and the carbon conversion rate is relatively low. Since biomass gasifiers cannot meet the hydrogen-carbon ratio required for biomethanol synthesis (requirement 1), the existing biomethanol production scheme needs to add a process section for external hydrogen supplementation, such as using water electrolysis to produce hydrogen. However, this process section increases both the investment cost of the equipment and the production cost of biomethanol, making biomethanol unable to compare with coal-to-methanol in terms of economic efficiency, thus losing market competitiveness. Summary of the invention

[0012] The purpose of the present invention is to overcome the shortcomings of the prior art. In view of the three requirements of the prior art for synthesis gas for synthetic biomethanol and the current situation that biomass gasifiers cannot meet them all at the same time, a biomethanol manufacturing process and system without the need for hydrogen supplementation is provided.

[0013] The present invention adopts the following technical solution:

[0014] In one aspect, the present invention provides a biomethanol production process without the need for hydrogen supplementation, comprising:

[0015] S1. Pyrolysis: The biomass raw materials are indirectly heated in an oxygen-free atmosphere, and the heating temperature is controlled between 450-600°C to produce a mixed gas of water, carbon monoxide, and carbon dioxide, a mixed liquid of organic acid and tar, and residual carbon solids;

[0016] S2, gasification: the mixed liquid and the residual carbon solid produced in step S1 are directly heated in an oxygen-deficient atmosphere, and the gasification temperature is controlled between 700-950° C. to produce gaseous products of hydrogen and carbon monoxide, and further produce residual carbon solid;

[0017] S3, hydrogen production: the gaseous product and residual carbon solid produced in step S2 are reacted with water vapor in the gaseous product under an oxygen-free or oxygen-deficient atmosphere at a temperature of 800-1000° C. to produce hydrogen;

[0018] S4, synthesis: the carbon monoxide, carbon dioxide and hydrogen produced after steps S1, S2 and S3 constitute synthesis gas, which is transported to the methanol synthesis process section after purification, and the finished methanol is obtained by Fischer-Tropsch synthesis.

[0019] Any possible implementation as described above, further provides an implementation, wherein the pyrolysis process time in step S1 is 40-60 minutes.

[0020] As any possible implementation described above, a further implementation is provided, in which the gasification process time in step S2 is 30-40 minutes.

[0021] Any possible implementation as described above further provides an implementation in which the hydrogen production process time in step S3 is 20-30 minutes.

[0022] Any possible implementation as described above further provides an implementation, in step S1, the oxygen-free atmosphere refers to an excess air coefficient of 0; in step S2, the oxygen-deficient atmosphere refers to an excess air index greater than 0 and less than 1.

[0023] Explanation of oxygen-free atmosphere and oxygen-deficient atmosphere in this application:

[0024] The pyrolysis process operates in an oxygen-free atmosphere and is in the medium-low temperature range. The gas produced in this process has a high calorific value, but the gas volume is small and contains tar, which is suitable for the first process stage of synthesis gas production.

[0025] The gasification process operates in an oxygen-deficient atmosphere and is in a high-temperature zone. The process produces a large amount of fuel gas with less tar, but low calorific value, which is suitable for the second process stage of synthesis gas production.

[0026] Neither the pyrolysis process in an oxygen-free atmosphere nor the gasification process in an oxygen-deficient atmosphere can independently meet the requirements of high calorific value and large gas volume of the synthesis gas, so the two need to be closely combined to jointly produce synthesis gas that meets the standards.

[0027] Explanation of direct pyrolysis and indirect heating in this application:

[0028] Direct heating refers to supplying a small amount of air or oxygen (excess air coefficient is less than 1) into the reactor to make part of the material undergo oxidation reaction, and use the heat generated to provide the heat required for the reaction of the remaining materials. Direct heating is mostly used in gasification process, and the gasification product is mainly in gaseous state. Biomass gasifiers basically use direct heating.

[0029] Indirect heating means that all materials do not undergo oxidation reaction, and only external heating is used to provide the heat required for the reaction to the materials in the reactor through a certain heat conduction method. Indirect heating is mostly used in pyrolysis process, and the pyrolysis products are mainly liquid.

[0030] Any possible implementation as described above further provides an implementation, in step S4, in the synthesis gas produced after steps S1, S2, and S3, the molar ratio of hydrogen to carbon monoxide is greater than 2, the calorific value of the synthesis gas is not less than 3000 kcal / kg, and the carbon conversion rate is not less than 95%.

[0031] As any possible implementation as described above, further provide an implementation, in step S2, a gasifying agent is used in the gasification process, and the gasifying agent includes air, oxygen, water vapor and carbon dioxide. The gasifying agent is used in the gasification step, and refers to a small amount of air, oxygen, water vapor, hydrogen or other similar gases introduced into the reactor to accelerate the gasification process and adjust the composition and proportion of the synthesis gas.

[0032] Any possible implementation as described above further provides an implementation, when a low nitrogen content is required in a subsequent synthesis process, the gasifying agent is selected to be pure oxygen or oxygen-enriched air.

[0033] Any possible implementation as described above further provides an implementation, in which in the three processes of pyrolysis, gasification and hydrogen production, a heating source is provided by fuel combustion, microwave heating or electric heating, and the fuel used is coal, gasoline, diesel or natural gas.

[0034] Any possible implementation as described above further provides an implementation, wherein a catalyst is used or not used in the gasification process; when a catalyst is used, the catalyst is one or more of a Ni-based catalyst, a natural ore, an alkali, and an alkaline earth metal. The Ni-based catalyst is used to increase the volume fraction of hydrogen and the removal rate of tar; the natural ore catalyst is used to effectively crack tar and absorb carbon dioxide; and the alkali and alkaline earth metal catalysts are used to accelerate the gasification reaction and reduce the coking rate.

[0035] Any possible implementation as described above further provides an implementation method, wherein the three process sections of pyrolysis, gasification and hydrogen production are implemented separately or integrated; when an integrated implementation is adopted, the three process sections are integrated into a set of equipment, and the equipment adopts a vertical structure or a horizontal structure.

[0036] Any possible implementation as described above further provides an implementation, wherein the device further includes a heating unit that provides heat to the three process sections through high temperature resistant pipes.

[0037] On the other hand, the present invention also provides a biomethanol production system without the need for hydrogen supplementation, comprising:

[0038] Pyrolysis process section: used to heat the biomass raw materials in an oxygen-free atmosphere to break the macromolecular chains in the biomass into small molecules; water, hydrogen, carbon monoxide and carbon dioxide are precipitated to produce a mixed gas, accompanied by a mixed liquid of organic acid and tar and residual carbon solid;

[0039] Gasification process section: used for heating the mixed liquid and residual carbon solid produced in the pyrolysis process section in an oxygen-deficient atmosphere, gasifying the mixed liquid into gaseous products of hydrogen and carbon monoxide, and further producing residual carbon solid;

[0040] The hydrogen production process section is used to heat the gaseous products and residual carbon solids produced in the gasification process section in an oxygen-free or oxygen-deficient atmosphere, and the residual carbon solids react with water vapor in the gaseous products to produce hydrogen;

[0041] Synthesis process section: used to convert carbon monoxide, carbon dioxide and hydrogen produced in the pyrolysis process section, gasification process section and hydrogen production process section into synthesis gas, and the synthesis gas is purified and then subjected to Fischer-Tropsch synthesis to obtain finished methanol;

[0042] The pyrolysis process section, gasification process section, and hydrogen production process section are implemented separately or integrated; when integrated, the three process sections are integrated into a set of equipment, and the equipment adopts a vertical structure or a horizontal structure.

[0043] The beneficial effects of the present invention are as follows: the conventional biomass gasification technology is improved, and the biomass raw material is sequentially subjected to three process stages: pyrolysis, gasification and online hydrogen production. The above three process stages can be integrated into a set of devices, or they can be separated and implemented in different devices. The hydrogen-to-carbon ratio in the generated synthesis gas is higher than the basic requirement for methanol synthesis (the molar ratio of hydrogen to carbon monoxide is greater than 2), and there is no need to supplement hydrogen from the outside, thereby avoiding the equipment investment and hydrogen production cost of water electrolysis hydrogen production. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Shown is a schematic flow chart of a biomethanol production process without the need for hydrogen supplementation according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The specific embodiments of the present invention will be described in detail below in conjunction with specific drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be considered isolated, and they can be combined with each other to achieve better technical effects.

[0046] like Figure 1 As shown, a biomethanol production process without the need for hydrogen supplementation according to an embodiment of the present invention comprises:

[0047] S1. Pyrolysis: Biomass raw materials are indirectly heated in an oxygen-free (also known as anaerobic, excess air coefficient is 0) atmosphere, and the heating temperature is controlled between 450-600°C. In this process section, the macromolecular chains in the biomass are broken into small molecules, and water (external moisture, internal moisture and combined crystal water), carbon monoxide, carbon dioxide, etc. are precipitated to produce mixed gas, mixed liquid of organic acid and tar, etc., and residual carbon solid;

[0048] S2, gasification: the mixed liquid and the residual carbon solid produced in step S1 are directly heated in an oxygen-deficient (also known as low-oxygen, excess air coefficient greater than 0 and less than 1) atmosphere, and the gasification temperature is controlled between 700-950° C. (in this process stage, liquids such as organic acids and tar are gasified into small molecular fuel gases such as hydrogen and carbon monoxide), and gaseous products of hydrogen and carbon monoxide are produced, and residual carbon solid is further produced;

[0049] S3, hydrogen production: the gaseous product and residual carbon solid produced in step S2 are reacted with water vapor in the gaseous product under an oxygen-free or oxygen-deficient atmosphere at a temperature of 800-1000° C. to produce hydrogen;

[0050] S4, synthesis: the carbon monoxide, carbon dioxide and hydrogen produced after steps S1, S2 and S3 constitute synthesis gas, which is transported to the methanol synthesis process section after purification, and the finished methanol is obtained by Fischer-Tropsch synthesis.

[0051] The hydrogen production process section is the main innovation of the present invention, and its chemical reaction formula is:

[0052]

[0053] and

[0054]

[0055] It can be seen that the function of the hydrogen production process section is to produce hydrogen online and supplement hydrogen to increase the hydrogen-carbon ratio. The carbon and water required for the reaction come from the products of pyrolysis and gasification of biomass raw materials. Generally, there is no need to supplement them from the outside, and they can also be supplemented in small amounts according to actual needs.

[0056] In step S1, the oxygen-free atmosphere refers to an excess air coefficient of 0; in step S2, the oxygen-deficient atmosphere refers to an excess air index greater than 0 and less than 1.

[0057] After the combined process of pyrolysis + gasification + hydrogen production, the three requirements for synthesizing biomethanol mentioned above can be met at the same time. Multiple embodiments have proved that in the synthesis gas produced after steps S1, S2, and S3, (1) the molar ratio of hydrogen to carbon monoxide is greater than 2, (2) the calorific value of the synthesis gas is not less than 3000 kcal / kg, and (3) the carbon conversion rate is not less than 95%.

[0058] In a specific embodiment, in step S3, the gaseous product and the residual carbon solid are fully mixed to improve the reaction efficiency. For example, the gaseous product can be introduced from the lower end of the residual carbon solid.

[0059] In a specific embodiment, in step S2, a gasifying agent is used in the gasification process, and the gasifying agent includes air, oxygen, water vapor and carbon dioxide.

[0060] In a specific embodiment, when a low nitrogen content is required in the subsequent synthesis process, the gasifying agent is pure oxygen or oxygen-enriched air.

[0061] In a specific embodiment, in the three processes of pyrolysis, gasification and hydrogen production, the heating source is provided by fuel combustion, microwave heating or electric heating, and the fuel used is coal, gasoline, diesel or natural gas. A part of the generated synthesis gas can also be led back for combustion.

[0062] In a specific embodiment, in the gasification process, a catalyst may be used or not, and the purpose of the present invention can be achieved; when a catalyst is used, the catalyst is one or more of a Ni-based catalyst, a natural ore, an alkali, and an alkaline earth metal.

[0063] In a specific embodiment, the three process sections of pyrolysis, gasification and hydrogen production are implemented separately or integrated. Considering the convenience of material transportation and minimization of heat loss, the three process sections can be integrated into a set of equipment. When integrated implementation is adopted, the equipment can adopt a vertical structure or a horizontal structure.

[0064] In a specific embodiment, when an integrated implementation is adopted, the heating unit can be integrated into one unit to provide heat to the three process sections through high temperature resistant pipes.

[0065] After the biomass raw materials go through the three process stages of pyrolysis, gasification and hydrogen production, more than 95% of the carbon has been converted into carbon monoxide and a small amount of carbon dioxide, and are transported to the methanol synthesis process section together with sufficient hydrogen after purification. This synthesis process section can be completed using the mature Fischer-Tropsch synthesis.

[0066] Fischer-Tropsch synthesis is an exothermic reaction. The purge gas from Fischer-Tropsch synthesis accounts for about 3%-8% of the raw synthesis gas. Its main components are hydrogen, carbon monoxide, low-carbon alkanes and other small amounts of gases. It can be introduced back into the heating unit of the preceding process (pyrolysis, gasification and hydrogen production) to maximize energy utilization and further reduce production costs. This can be regarded as a new mode of recycling the purge gas from Fischer-Tropsch synthesis.

[0067] The embodiment of the present invention provides a biomethanol production system without the need for hydrogen supplementation, comprising:

[0068] Pyrolysis process section: used to heat the biomass raw materials in an oxygen-free atmosphere to break the macromolecular chains in the biomass into small molecules; water, hydrogen, carbon monoxide and carbon dioxide are precipitated to produce a mixed gas, accompanied by a mixed liquid of organic acid and tar and residual carbon solid;

[0069] Gasification process section: used for heating the mixed liquid and residual carbon solid produced in the pyrolysis process section in an oxygen-deficient atmosphere, gasifying the mixed liquid into gaseous products of hydrogen and carbon monoxide, and further producing residual carbon solid;

[0070] The hydrogen production process section is used to heat the gaseous products and residual carbon solids produced in the gasification process section in an oxygen-free or oxygen-deficient atmosphere, and the residual carbon solids react with water vapor in the gaseous products to produce hydrogen;

[0071] Synthesis process section: used to convert carbon monoxide, carbon dioxide and hydrogen produced in the pyrolysis process section, gasification process section and hydrogen production process section into synthesis gas, and the synthesis gas is purified and then subjected to Fischer-Tropsch synthesis to obtain finished methanol;

[0072] The pyrolysis process section, gasification process section, and hydrogen production process section are implemented separately or integrated; when integrated, the three process sections are integrated into a set of equipment, and the equipment adopts a vertical structure or a horizontal structure.

[0073] Example 1

[0074] In this embodiment, the biomass raw material is yellow pine wood waste, the control temperature of the pyrolysis process section is 550°C, and the reaction time is 50 minutes; the control temperature of the gasification process section is 850°C, and the reaction time is 35 minutes, air is used as the gasification agent, and there is no catalyst; the control temperature of the hydrogen production process section is 950°C, and the reaction time is 25 minutes.

[0075] The three process sections of biomass pyrolysis, gasification and hydrogen production are integrated into a horizontal device, with heat provided by a heating chamber. The initial ignition of the heating chamber requires external fuel, such as natural gas, diesel or gasoline. After ignition, part of the synthesis gas produced by the three process sections of pyrolysis, gasification and hydrogen production is led back to the heating chamber as fuel, and the rest is provided to the methanol synthesis process section.

[0076] The gasifying agent in this embodiment is air. The main components of the synthesis gas output after the biomass undergoes three process stages of pyrolysis, gasification and hydrogen production are as shown in Table 1:

[0077] Table 1

[0078]

[0079]

[0080] Example 2

[0081] In this embodiment, the biomass raw material is corn straw pellets, the control temperature of the pyrolysis process section is 600°C, and the reaction time is 40 minutes; the control temperature of the gasification process section is 900°C, and the reaction time is 40 minutes, oxygen is used as the gasification agent, and there is no catalyst; the control temperature of the hydrogen production process section is 900°C, and the reaction time is 30 minutes.

[0082] The three process sections of biomass pyrolysis, gasification and hydrogen production are integrated into a vertical device, with heat provided by a heating chamber. The initial ignition of the heating chamber requires external fuel, such as natural gas, diesel or gasoline. After ignition, part of the synthesis gas produced by the three process sections of pyrolysis, gasification and hydrogen production is led back to the heating chamber as fuel, and the rest is provided to the methanol synthesis process section.

[0083] The gasifying agent in this embodiment is oxygen. The main components of the synthesis gas output after the biomass undergoes three process stages of pyrolysis, gasification and hydrogen production are as shown in Table 2:

[0084] Table 2

[0085]

[0086] The present invention improves the conventional biomass gasification technology, and the biomass raw material is sequentially subjected to three process stages of pyrolysis, gasification and online hydrogen production. The above three process stages can be integrated into a set of devices, or they can be separated and implemented in different devices. The hydrogen-carbon ratio in the generated synthesis gas is higher than the basic requirement of methanol synthesis (the molar ratio of hydrogen to carbon monoxide is greater than 2), and there is no need to supplement hydrogen from the outside, thereby avoiding the equipment investment and hydrogen production cost of water electrolysis hydrogen production.

[0087] Although several embodiments of the present invention have been given herein, those skilled in the art should understand that the embodiments of the present invention may be modified without departing from the spirit of the present invention. The above embodiments are merely exemplary and should not be used as a limitation on the scope of the present invention.

Claims

1. A biomethanol production process without the need for hydrogen supplementation, characterized in that: The process comprises: S1. Pyrolysis: The biomass raw material is indirectly heated in an oxygen-free atmosphere, and the heating temperature is controlled between 450-600°C to produce a mixed gas of water, carbon monoxide, and carbon dioxide, a mixed liquid of organic acid and tar, and residual carbon solid; the pyrolysis process time is 40-60 minutes; S2, gasification: the mixed liquid and the residual carbon solid produced in step S1 are directly heated in an oxygen-deficient atmosphere, and the gasification temperature is controlled between 700-950° C. to produce gaseous products of hydrogen and carbon monoxide, and further produce residual carbon solid; the gasification process time is 30-40 minutes; S3, hydrogen production: the gaseous product and residual carbon solid produced in step S2 are reacted with water vapor in the gaseous product under an oxygen-free or oxygen-deficient atmosphere at a temperature of 800-1000°C to produce hydrogen; the hydrogen production process takes 20-30 minutes; S4, synthesis: the carbon monoxide, carbon dioxide and hydrogen produced after steps S1, S2 and S3 form synthesis gas, which is transported to the methanol synthesis process section after purification, and the finished methanol is obtained by Fischer-Tropsch synthesis; In step S1, the oxygen-free atmosphere refers to an excess air coefficient of 0; in step S2, the oxygen-deficient atmosphere refers to an excess air index greater than 0 and less than 1.

2. The biomethanol production process without hydrogen supplementation as claimed in claim 1, characterized in that: In step S4, in the synthesis gas generated after steps S1, S2 and S3, the molar ratio of hydrogen to carbon monoxide is greater than 2, the calorific value of the synthesis gas is not less than 3000 kcal / kg, and the carbon conversion rate is not less than 95%.

3. The biomethanol production process without hydrogen supplementation as claimed in claim 1, characterized in that: In step S2, a gasifying agent is used in the gasification process, and the gasifying agent includes air, oxygen, water vapor or carbon dioxide.

4. The biomethanol production process without hydrogen supplementation as claimed in claim 3, characterized in that: When low nitrogen content is required in the subsequent synthesis process, the gasifying agent is selected as pure oxygen or oxygen-enriched air.

5. The biomethanol production process without hydrogen supplementation as claimed in claim 1, characterized in that: In the three processes of pyrolysis, gasification and hydrogen production, the heating source is provided by fuel combustion, microwave heating or electric heating, and the fuel used is coal, gasoline, diesel or natural gas.

6. The biomethanol production process without hydrogen supplementation as claimed in claim 1, characterized in that: In the gasification process, a catalyst is used or not; when a catalyst is used, the catalyst is one or more of a Ni-based catalyst, a natural ore, an alkali, and an alkaline earth metal.

7. The biomethanol production process without hydrogen supplementation as claimed in claim 1, characterized in that: The three process sections of pyrolysis, gasification and hydrogen production are implemented separately or integrated. When the integrated implementation is adopted, the three process sections are integrated into a set of equipment, and the equipment adopts a vertical structure or a horizontal structure.

8. The biomethanol production process without hydrogen supplementation as claimed in claim 7, characterized in that: The device also includes a heating unit that provides heat to the three process sections through high-temperature resistant pipes.

9. A biomethanol production system without the need for hydrogen supplementation, characterized in that: The system is used to implement the process according to any one of claims 1 to 8, and the system comprises: Pyrolysis process section: used to heat the biomass raw materials in an oxygen-free atmosphere to break the macromolecular chains in the biomass into small molecules; water, hydrogen, carbon monoxide and carbon dioxide are precipitated to produce a mixed gas, accompanied by a mixed liquid of organic acid and tar and residual carbon solid; Gasification process section: used for heating the mixed liquid and residual carbon solid produced in the pyrolysis process section in an oxygen-deficient atmosphere, gasifying the mixed liquid into gaseous products of hydrogen and carbon monoxide, and further producing residual carbon solid; The hydrogen production process section is used to heat the gaseous products and residual carbon solids produced in the gasification process section in an oxygen-free or oxygen-deficient atmosphere, and the residual carbon solids react with water vapor in the gaseous products to produce hydrogen; Synthesis process section: used to convert carbon monoxide, carbon dioxide and hydrogen produced in the pyrolysis process section, gasification process section and hydrogen production process section into synthesis gas, and the synthesis gas is purified and then subjected to Fischer-Tropsch synthesis to obtain finished methanol; The pyrolysis process section, gasification process section, and hydrogen production process section are implemented separately or integrated; when integrated, the three process sections are integrated into a set of equipment, and the equipment adopts a vertical structure or a horizontal structure.

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