Zero-emission methanol preparation equipment and method based on garbage gasification and water electrolysis

Abstract

The embodiment of the invention provides zero-emission methanol preparation equipment and method based on garbage gasification and water electrolysis. The equipment comprises a water electrolysis hydrogen production unit, a garbage gasification unit, a first methanol synthesis unit, a second methanol synthesis unit and a gas separation unit, the water electrolysis hydrogen production unit is respectively connected with the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit; the gas separation unit is respectively connected with the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit; the water electrolysis hydrogen production unit generates hydrogen and oxygen through electrolysis; the garbage gasification unit is used for carrying out gasification reaction by using oxygen provided by the water electrolysis hydrogen production unit to prepare synthesis gas containing carbon monoxide, carbon dioxide and hydrogen; the gas separation unit is used for separating carbon monoxide, carbon dioxide and hydrogen in the synthesis gas introduced from the garbage gasification unit, the carbon monoxide and the hydrogen are introduced into the first methanol synthesis unit, and the carbon dioxide is introduced into the second methanol synthesis unit for preparing methanol respectively.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of methanol preparation, and specifically relate to a zero-emission methanol preparation device and method based on garbage gasification and water electrolysis. Background Art

[0002] Methanol synthesis is an important process in the chemical industry, and its raw materials are diverse, including natural gas, naphtha, heavy oil, coal and its processed products. As one of the main raw materials in the organic chemical industry, methanol has a wide range of uses, such as the manufacture of formaldehyde, dimethyl terephthalate (DMT), methyl methacrylate (MMA), methylamine, polyvinyl alcohol, methyl chloride, acetic acid, etc. It can also be used as a solvent and fuel.

[0003] The technology of high-temperature gasification of garbage to produce hydrogen is mainly based on thermochemical processes. It converts organic matter in garbage into hydrogen-rich synthesis gas through high-temperature gasification reactions. In this process, organic matter is decomposed into synthesis gas mainly composed of hydrogen, carbon monoxide, and methane under oxygen-deficient and high-temperature conditions, while inorganic matter is melted into metal and glass slag, which can be used as raw materials for roadbed, building materials, etc. This method of producing methanol, like coal gasification to produce methanol, will produce a large amount of carbon dioxide and other pollutants, which will put great pressure on the environment. With the improvement of global environmental protection requirements, this production method is facing increasing environmental pressure.

[0004] At the same time, the hydrogen content in the synthesis gas produced by high-temperature gasification of garbage is insufficient. If it is directly used as a raw material for synthesizing methanol, the following problems will arise:

[0005] 1. Impact on reaction rate and conversion rate, including:

[0006] Reaction rate decreases: The synthesis of methanol mainly depends on the reaction of carbon monoxide (CO) and hydrogen H2. When the hydrogen content is insufficient, the number of effective collisions between CO and H2 decreases, resulting in a decrease in the reaction rate.

[0007] Reduced conversion rate: Insufficient hydrogen will limit the amount of methanol produced, because the synthesis of methanol requires sufficient hydrogen to react with CO. Therefore, insufficient hydrogen content will directly lead to a decrease in the conversion rate of methanol.

[0008] 2. Impact on catalyst performance, including:

[0009] Decreased catalyst activity: In the methanol synthesis reaction, catalysts (such as copper-based catalysts) play a vital role. However, when the hydrogen content is insufficient, the active centers of the catalyst may not be fully utilized, thus affecting the overall activity of the catalyst.

[0010] Shortened catalyst life: Insufficient hydrogen may also cause an increase in side reactions, such as the disproportionation reaction of CO. These side reactions will generate by-products such as carbon deposits, which will cover the catalyst surface and cause catalyst deactivation or poisoning, thereby shortening the catalyst's service life.

[0011] 3. Impact on product distribution, including:

[0012] Increased by-products: When hydrogen is insufficient, in addition to methanol, more by-products such as hydrocarbons, ethers, lipids, ketones, etc. may be generated. The generation of these by-products will not only reduce the purity of methanol, but also increase the difficulty of subsequent separation and purification.

[0013] Deterioration in methanol quality: Due to the increase in by-products and the decrease in methanol conversion rate, the quality of the final methanol product may decline, such as insufficient purity and high impurity content.

[0014] 4. Impact on energy consumption and costs, including:

[0015] Increased energy consumption: In order to compensate for the impact of insufficient hydrogen on the reaction rate and conversion rate, it may be necessary to increase the reaction temperature or pressure and other conditions, which will increase energy consumption. At the same time, due to the increase in by-products and the shortening of catalyst life, more energy consumption is also required for subsequent treatment and replacement of catalysts.

[0016] Rising costs: Insufficient hydrogen content will lead to reduced methanol production, reduced quality, and increased energy consumption, all of which will directly increase production costs. In addition, frequent catalyst replacement and by-product treatment will also increase additional costs.

[0017] Therefore, how to solve the above problems has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0018] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a zero-emission methanol production device and method based on garbage gasification and water electrolysis.

[0019] A first aspect of an embodiment of the present disclosure provides a zero-emission methanol production device based on garbage gasification and water electrolysis, comprising: a water electrolysis hydrogen production unit, a garbage gasification unit, a first methanol synthesis unit, a second methanol synthesis unit and a gas separation unit;

[0020] The water electrolysis hydrogen production unit is connected to the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit respectively; the gas separation unit is connected to the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit respectively;

[0021] The electrolysis unit for producing hydrogen by electrolysis generates hydrogen and oxygen; the waste gasification unit uses the oxygen provided by the electrolysis unit for producing hydrogen by electrolysis to produce synthesis gas including carbon monoxide, carbon dioxide and hydrogen by gasification reaction; the gas separation unit is used to separate carbon monoxide, carbon dioxide and hydrogen in the synthesis gas introduced by the waste gasification unit, so that carbon monoxide and hydrogen are introduced into the first methanol synthesis unit, and carbon dioxide is introduced into the second methanol synthesis unit;

[0022] The first methanol synthesis unit produces methanol based on hydrogen and carbon monoxide, and the second methanol synthesis unit produces methanol based on carbon dioxide and hydrogen provided by the water electrolysis hydrogen production unit.

[0023] Optionally, the gas separation unit includes a methanol cleaning subunit and a heating subunit, and the methanol cleaning subunit is connected to the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit respectively; the methanol cleaning subunit is used to remove acidic gas in the synthesis gas introduced from the garbage gasification unit, so that hydrogen and carbon monoxide in the introduced gas flow to the first methanol synthesis unit;

[0024] The heating subunit is used to heat the methanol cleaning subunit so as to separate the carbon dioxide dissolved in the methanol cleaning subunit and flow it to the second methanol synthesis unit.

[0025] Optionally, it further includes: a sulfur recovery unit connected to the methanol cleaning subunit, and the sulfur recovery unit is used to reduce the sulfur component of the acid gas to sulfur.

[0026] Furthermore, it also includes: a garbage drying unit, which is used to dry the garbage.

[0027] Furthermore, it also includes: a garbage screening unit, which is used to screen the garbage and transport the screened garbage to the garbage drying unit.

[0028] Furthermore, it also includes: a garbage crushing unit, which is used to crush the garbage and transport the crushed garbage to the garbage screening unit.

[0029] Furthermore, it also includes: an odor treatment unit and a permeate treatment unit, wherein the odor treatment unit is used to deodorize the odor generated by the garbage; the permeate treatment unit is used to collect the permeate generated by the garbage and transport it to the permeate treatment station.

[0030] A second aspect of the embodiments of the present disclosure provides a zero-emission methanol production method based on garbage gasification and water electrolysis, the production method is implemented according to the above-mentioned equipment, and includes:

[0031] Using a water electrolysis hydrogen production unit to electrolyze and produce hydrogen and oxygen;

[0032] The garbage gasification unit utilizes the oxygen provided by the water electrolysis hydrogen production unit to carry out a gasification reaction to produce a synthesis gas including carbon monoxide and carbon dioxide;

[0033] The gas separation unit is used to separate carbon monoxide, carbon dioxide and hydrogen in the synthesis gas introduced from the garbage gasification unit, so that carbon monoxide and hydrogen are introduced into the first methanol synthesis unit, and carbon dioxide is introduced into the second methanol synthesis unit; wherein, the first methanol synthesis unit produces methanol based on hydrogen and carbon monoxide, and the second methanol synthesis unit produces methanol based on carbon dioxide and hydrogen provided by the water electrolysis hydrogen production unit.

[0034] Optionally, the gas separation unit includes a methanol cleaning subunit and a heating subunit; the methanol cleaning subunit is used to remove acidic gas from the synthesis gas introduced from the garbage gasification unit, so that hydrogen and carbon monoxide in the introduced gas flow to the first methanol synthesis unit;

[0035] The heating subunit is used to heat the methanol cleaning subunit so as to separate the carbon dioxide dissolved in the methanol cleaning subunit and flow it to the second methanol synthesis unit.

[0036] Optionally, after the methanol washing subunit is used to remove the acid gas in the synthesis gas introduced from the garbage gasification unit, it also includes: using a sulfur recovery unit to reduce the sulfur component of the acid gas to sulfur.

[0037] The beneficial effects of the embodiments of the present disclosure include:

[0038] In the present disclosure, the waste gasification unit is used to realize waste recycling, which is beneficial to environmental protection. In addition, the waste gasification unit and the water electrolysis hydrogen production unit compensate each other for raw materials, so that the raw material ratio of the two synthesis units is reasonable, the quality of methanol is guaranteed, and at the same time, material waste and pollutant emissions are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic structural diagram of a zero-emission methanol production device based on garbage gasification and water electrolysis according to an embodiment of the present disclosure;

[0040] Figure 2 This is a schematic structural diagram of a zero-emission methanol production device based on garbage gasification and water electrolysis according to another embodiment of the present disclosure;

[0041] Figure 3 The present invention is a schematic flow chart of a method for preparing zero-emission methanol based on garbage gasification and water electrolysis according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions and drawings of the following examples are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "multiple" is more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the error tolerance range. "Parallel" is not parallel in the strict sense, but within the error tolerance range.

[0044] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0045] like Figure 1 As shown, a zero-emission methanol production device based on garbage gasification and water electrolysis includes a water electrolysis hydrogen production unit, a garbage gasification unit, a first methanol synthesis unit, a second methanol synthesis unit and a gas separation unit.

[0046] The water electrolysis hydrogen production unit is respectively connected to the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit, and the gas separation unit is respectively connected to the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit.

[0047] The electrolysis unit produces hydrogen and oxygen by electrolysis, and the garbage gasification unit uses the oxygen provided by the electrolysis unit to produce synthesis gas including carbon monoxide, carbon dioxide and hydrogen by gasification reaction. The gas separation unit is used to separate carbon monoxide, carbon dioxide and hydrogen in the synthesis gas introduced from the garbage gasification unit, so that carbon monoxide and hydrogen are introduced into the first methanol synthesis unit, and carbon dioxide is introduced into the second methanol synthesis unit.

[0048] Among them, the first methanol synthesis unit produces methanol based on hydrogen and carbon monoxide, and the second methanol synthesis unit produces methanol based on carbon dioxide and hydrogen provided by the water electrolysis hydrogen production unit.

[0049] In some embodiments, the garbage gasification unit uses garbage or RDF fuel as a gasification reaction raw material. Garbage or RDF fuel can replace bituminous coal to achieve resource recycling.

[0050] In the present disclosure, the waste gasification unit is used to realize waste recycling, which is beneficial to environmental protection. In addition, the waste gasification unit and the water electrolysis hydrogen production unit compensate each other for raw materials, so that the raw material ratio of the two synthesis units is reasonable, the quality of methanol is guaranteed, and at the same time, material waste and pollutant emissions are avoided.

[0051] In some embodiments, the gas separation unit includes a methanol cleaning subunit and a heating subunit. The methanol cleaning subunit is respectively connected to the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit. The methanol cleaning subunit is used to remove the acidic gas in the synthesis gas introduced from the garbage gasification unit so that the hydrogen and carbon monoxide in the introduced gas can flow to the first methanol synthesis unit.

[0052] The heating subunit is used to heat the methanol washing subunit so as to separate the carbon dioxide dissolved in the methanol washing subunit and flow it to the second methanol synthesis unit.

[0053] In some embodiments, the preparation equipment further includes a sulfur recovery unit, which is connected to the methanol cleaning subunit, and is used to reduce the sulfur component of the acid gas to sulfur.

[0054] refer to Figure 2 In some embodiments, the methanol production equipment further comprises a garbage drying unit, which is used to dry the garbage. Using the garbage drying unit to dry the garbage can significantly increase the calorific value of the garbage and reduce its volume, thereby more efficiently preparing RDF fuel (refuse derived fuel). In addition, the drying process can also reduce the moisture content in the garbage to improve the gasification efficiency.

[0055] In some embodiments, the methanol preparation device further includes a garbage screening unit, which is used to screen the garbage and transport the screened garbage to the garbage drying unit.

[0056] The benefits of using a garbage screening unit include:

[0057] 1. Through the garbage screening unit, large debris (such as stones, metals, etc.) and fine impurities (such as dust, sand, etc.) can be effectively removed, thereby reducing the burden on subsequent processing equipment.

[0058] 2. The screened garbage is more uniform, which is conducive to improving the working efficiency of the garbage drying unit and other processing equipment.

[0059] 3. The screening process can remove substances that are not suitable for use as RDF fuel, ensuring that the final prepared RDF fuel has a higher calorific value and more stable combustion performance.

[0060] 4. Through screening, the particle size of the material entering the garbage drying unit can be controlled, making the dried material more suitable for further processing into high-quality RDF fuel.

[0061] 5. After removing unnecessary impurities, the waste drying unit and other processing equipment can work more efficiently, thereby reducing the energy consumption of the entire system.

[0062] In some embodiments, the garbage screening unit includes a polygonal disc screen, a magnetic separator and a wind separator, and RDF raw materials are obtained from domestic garbage through multi-stage screening of the polygonal disc screen, the magnetic separator and the wind separator.

[0063] In some embodiments, the methanol preparation equipment further includes a garbage crushing unit, which is used to crush the garbage and transport the crushed garbage to the garbage screening unit.

[0064] The beneficial effects of using a garbage crushing unit include:

[0065] 1. The garbage crushing unit can break large pieces of garbage into smaller and more uniform particles, which helps the consistency and efficiency of the subsequent garbage screening and garbage drying process.

[0066] 2. The crushed garbage materials are easier to be accurately screened through the garbage screening unit to remove unnecessary impurities.

[0067] 3. The crushed garbage has a smaller volume and surface area, which can reach the required degree of dryness more quickly during the garbage drying process, thereby reducing the overall processing time.

[0068] 4. Uniform small particle materials can be more evenly distributed in the processing equipment, improving the working efficiency and stability of the equipment.

[0069] 5. The crushed garbage has a larger surface area, which is conducive to the evaporation of water and the decomposition of organic matter, thereby increasing the calorific value of the final RDF fuel.

[0070] 6. Uniform small particles are more stable during combustion, reducing incomplete combustion and improving combustion efficiency and environmental protection performance.

[0071] In some embodiments, the garbage crushing unit includes a coarse crusher, which is used to perform preliminary crushing on the garbage for subsequent sorting.

[0072] In some embodiments, the methanol production equipment further includes an odor treatment unit, and the odor treatment unit is used to deodorize the odor generated by the garbage.

[0073] The beneficial effects of using an odor treatment unit include:

[0074] 1. The odor unit can significantly reduce the odorous gases generated in the garbage storage pool and during the treatment process through effective deodorization technology, providing a cleaner and more comfortable working environment.

[0075] 2. Efficient odor treatment units can ensure that the treated gas meets national and local emission standards, avoiding fines or legal proceedings due to excessive emissions.

[0076] 3. Malodorous gases may contain corrosive components. Effective odor treatment can reduce the corrosion of these gases to equipment and buildings and extend their service life.

[0077] 4. Reduce equipment damage and repair frequency caused by malodorous gases, and reduce maintenance costs.

[0078] In some embodiments, the methanol production equipment further includes a permeate treatment unit, which is used to collect the permeate generated by the garbage and transport it to a permeate treatment station.

[0079] The benefits of using a permeate treatment unit include:

[0080] 1. Liquid usually contains high concentrations of organic matter, heavy metals and other harmful substances. Through effective collection and treatment, these pollutants can be prevented from entering the soil and groundwater, protecting the environment from pollution.

[0081] 2. After being treated at the leachate treatment station, it can meet national and local emission standards to ensure that there will be no negative impact on the environment.

[0082] 3. Through effective permeate management, equipment damage and downtime caused by permeate leakage or improper handling can be reduced, and overall production efficiency can be improved.

[0083] A specific example provided by the present disclosure includes:

[0084] The scheme includes the following steps: the preparation equipment includes a water electrolysis hydrogen production unit, a garbage gasification unit, a first methanol synthesis unit, a second methanol synthesis unit and a gas separation unit. Specifically:

[0085] (1) Water electrolysis hydrogen production unit

[0086] (1-1) Water is injected into the electrolytic hydrogen production unit to produce H 2 With O 2 .

[0087] (1-2) Part H 2 Enter the first methanol synthesis unit to supplement H 2 content, ensuring the reaction rate and purity of methanol produced by the first methanol synthesis unit.

[0088] (1-3) Another part H 2 Enter the second methanol synthesis unit to produce methanol.

[0089] (1-4)O 2 Enter the garbage gasification unit, participate in the garbage gasification reaction, produce synthesis gas, and at the same time assist in combustion and provide heat.

[0090] (2) Waste gasification unit

[0091] (2-1) The garbage gasification unit ensures the temperature and oxygen environment required for the reaction, and generates synthesis gas (mainly composed of: CO, CO 2 , H 2 ), enters the gas separation unit, which includes a methanol cleaning subunit and a heating subunit.

[0092] (2-2) The synthesis gas is cleaned and separated by the gas methanol cleaning subunit to obtain CO and H 2 Enter the first methanol synthesis unit.

[0093] (2-3) The methanol cleaning subunit is heated by the heating subunit to make the CO dissolved in the low-temperature methanol 2 The precipitate is separated and enters the second methanol synthesis unit to be used for producing methanol.

[0094] (3) Gas separation unit

[0095] The gas separation unit includes a methanol cleaning subunit and a heating subunit. The methanol cleaning subunit stores low-temperature methanol solution. Methanol is used to treat acidic gases (such as CO) at low temperatures. 2 , H 2 S, COS, etc.) are extremely soluble in water to remove these acid gases from the raw gas and introduce them into the sulfur recovery unit.

[0096] (4) Sulfur recovery unit

[0097] The sulfur content (H 2 S, COS) are reduced to sulfur and stored.

[0098] (5) The first methanol synthesis unit

[0099] (5-1) Main reactions:

[0100] (ΔH=-99kJ / mol)

[0101] (5-2) Secondary reactions:

[0102] CO 2 +3H 2 →CH 3 OH+H 2 O(ΔH=-58kJ / mol)

[0103] (6) Second Methanol Synthesis Unit

[0104] reaction:

[0105] CO 2 +3H 2 →CH 3 OH+H 2 O(ΔH=-58kJ / mol)

[0106] refer to Figure 3 According to a second aspect of the embodiments of the present disclosure, there is provided a method for preparing zero-emission methanol based on garbage gasification and water electrolysis. The preparation method is implemented according to the above-mentioned equipment, and includes:

[0107] S101, using a water electrolysis hydrogen production unit to electrolyze and generate hydrogen and oxygen.

[0108] S102, the garbage gasification unit uses the oxygen provided by the water electrolysis hydrogen production unit to perform a gasification reaction to produce a synthesis gas including carbon monoxide and carbon dioxide.

[0109] S103, the gas separation unit is used to separate carbon monoxide, carbon dioxide and hydrogen in the synthesis gas introduced from the garbage gasification unit, so that carbon monoxide and hydrogen are introduced into the first methanol synthesis unit, and carbon dioxide is introduced into the second methanol synthesis unit. The first methanol synthesis unit produces methanol based on hydrogen and carbon monoxide, and the second methanol synthesis unit produces methanol based on carbon dioxide and hydrogen provided by the water electrolysis hydrogen production unit.

[0110] In some embodiments, the gas separation unit includes a methanol cleaning subunit and a heating subunit. The methanol cleaning subunit is used to remove acidic gases in the synthesis gas introduced from the garbage gasification unit so that hydrogen and carbon monoxide in the introduced gas can flow to the first methanol synthesis unit.

[0111] The heating subunit is used to heat the methanol washing subunit so as to separate the carbon dioxide dissolved in the methanol washing subunit and flow it to the second methanol synthesis unit.

[0112] In some embodiments, after the methanol cleaning subunit is used to remove acidic gas from the synthesis gas introduced from the garbage gasification unit, the method further includes: S104, reducing the sulfur component of the acidic gas to sulfur using a sulfur recovery unit.

[0113] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A zero-emission methanol production device based on garbage gasification and water electrolysis, characterized in that: include: A water electrolysis hydrogen production unit, a garbage gasification unit, a first methanol synthesis unit, a second methanol synthesis unit and a gas separation unit; The water electrolysis hydrogen production unit is connected to the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit respectively; the gas separation unit is connected to the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit respectively; The electrolysis unit for producing hydrogen by electrolysis generates hydrogen and oxygen; the waste gasification unit uses the oxygen provided by the electrolysis unit for producing hydrogen by electrolysis to produce synthesis gas including carbon monoxide, carbon dioxide and hydrogen by gasification reaction; the gas separation unit is used to separate carbon monoxide, carbon dioxide and hydrogen in the synthesis gas introduced by the waste gasification unit, so that carbon monoxide and hydrogen are introduced into the first methanol synthesis unit, and carbon dioxide is introduced into the second methanol synthesis unit; The first methanol synthesis unit produces methanol based on hydrogen and carbon monoxide, and the second methanol synthesis unit produces methanol based on carbon dioxide and hydrogen provided by the water electrolysis hydrogen production unit.

2. The zero-emission methanol production equipment based on garbage gasification and water electrolysis according to claim 1 is characterized in that: The gas separation unit includes a methanol cleaning subunit and a heating subunit, wherein the methanol cleaning subunit is connected to the garbage gasification unit, the first methanol synthesis unit and the second methanol synthesis unit respectively; the methanol cleaning subunit is used to remove acidic gas from the synthesis gas introduced from the garbage gasification unit, so that hydrogen and carbon monoxide in the introduced gas can flow to the first methanol synthesis unit; The heating subunit is used to heat the methanol cleaning subunit so as to separate the carbon dioxide dissolved in the methanol cleaning subunit and flow it to the second methanol synthesis unit.

3. A zero-emission methanol production device based on garbage gasification and water electrolysis according to claim 2, characterized in that: Also includes: A sulfur recovery unit is connected to the methanol cleaning subunit, and the sulfur recovery unit is used to reduce the sulfur component of the acid gas to sulfur.

4. The zero-emission methanol production equipment based on garbage gasification and water electrolysis according to claim 1 is characterized in that: Also includes: A garbage drying unit, wherein the garbage drying unit is used for drying garbage.

5. The zero-emission methanol production equipment based on garbage gasification and water electrolysis according to claim 4 is characterized in that: Also includes: The garbage screening unit is used to screen the garbage and transport the screened garbage to the garbage drying unit.

6. The zero-emission methanol production equipment based on garbage gasification and water electrolysis according to claim 5 is characterized in that: Also includes: The garbage crushing unit is used to crush the garbage and transport the crushed garbage to the garbage screening unit.

7. The zero-emission methanol production equipment based on garbage gasification and water electrolysis according to claim 6 is characterized in that: Also includes: An odor treatment unit and a permeate treatment unit, wherein the odor treatment unit is used to deodorize the odor generated by the garbage; The permeate treatment unit is used to collect the permeate generated by the garbage and transport it to the permeate treatment station.

8. A zero-emission methanol production method based on garbage gasification and water electrolysis, the production method is implemented by the equipment according to any one of claims 1 to 7, characterized in that: include: Using a water electrolysis hydrogen production unit to electrolyze and produce hydrogen and oxygen; The garbage gasification unit utilizes the oxygen provided by the water electrolysis hydrogen production unit to carry out a gasification reaction to produce a synthesis gas including carbon monoxide and carbon dioxide; The gas separation unit is used to separate carbon monoxide, carbon dioxide and hydrogen in the synthesis gas introduced from the garbage gasification unit, so that carbon monoxide and hydrogen are introduced into the first methanol synthesis unit, and carbon dioxide is introduced into the second methanol synthesis unit; wherein, the first methanol synthesis unit produces methanol based on hydrogen and carbon monoxide, and the second methanol synthesis unit produces methanol based on carbon dioxide and hydrogen provided by the water electrolysis hydrogen production unit.

9. According to the method for preparing zero-emission methanol based on garbage gasification and water electrolysis in claim 8, the gas separation unit comprises a methanol cleaning subunit and a heating subunit; the methanol cleaning subunit is used to remove acidic gas from the synthesis gas introduced from the garbage gasification unit, so that hydrogen and carbon monoxide in the introduced gas can flow to the first methanol synthesis unit; The heating subunit is used to heat the methanol cleaning subunit so as to separate the carbon dioxide dissolved in the methanol cleaning subunit and flow it to the second methanol synthesis unit.

10. The method for preparing zero-emission methanol based on garbage gasification and water electrolysis according to claim 8, characterized in that: After the methanol washing subunit is used to remove the acid gas in the synthesis gas introduced from the garbage gasification unit, it also includes: using a sulfur recovery unit to reduce the sulfur component of the acid gas to sulfur.

Images