System for preparing green methanol by using solid waste synthesis gas

Abstract

The utility model relates to the technical field of solid waste synthesis gas treatment, in particular to a system for preparing green methanol by using solid waste synthesis gas. The system comprises a reaction furnace, a catalytic reaction chamber, a membrane separation device and a methanol synthesis device which are sequentially connected, the reaction furnace is used for gasifying or pyrolyzing solid waste, and the catalytic reaction chamber is used for performing catalytic cracking on tar components in synthesis gas generated by gasifying or pyrolyzing under preset catalytic cracking conditions; the membrane separation device is used for separating and purifying mixed gas generated by catalytic cracking, and the methanol synthesis device is used for synthesizing hydrogen and carbon dioxide obtained by separation and purification under the catalytic action of a photo-thermal catalyst to obtain green methanol. According to the technical scheme, tar can be efficiently degraded, and the energy consumption for preparing green methanol can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of solid waste synthesis gas treatment, in particular to a system for preparing green methanol by utilizing solid waste synthesis gas. Background Art

[0002] As environmental issues become increasingly severe, the use of traditional fossil fuels is being restricted, and the search for clean, renewable energy has become a global consensus. Green methanol, as a new clean energy source, is widely considered a key fuel for the future, potentially enabling decarbonization in sectors such as transportation and shipping. It can be produced using synthesis gas (syngas) derived from the gasification or pyrolysis of solid waste (referred to as solid waste). However, the byproduct tar produced during the gasification or pyrolysis process not only reduces the quality of the synthesis gas, damages equipment, and pollutes the environment.

[0003] In related technologies, tar is mostly treated by methods such as physical washing or thermal cracking, but these methods have problems such as low efficiency and high energy consumption, and fail to effectively utilize the carbon resources in tar; in addition, the traditional chemical catalysts used to convert synthesis gas into green methanol have harsh catalytic conditions and require a high-temperature environment, and the process consumes a lot of energy.

[0004] Therefore, there is an urgent need for a system for producing green methanol using solid waste synthesis gas to solve the above technical problems. Utility Model Content

[0005] The embodiment of the utility model provides a system for preparing green methanol by utilizing solid waste synthesis gas, which can efficiently degrade tar and reduce the energy consumption of preparing green methanol.

[0006] An embodiment of the present utility model provides a system for preparing green methanol by utilizing solid waste synthesis gas, comprising a reactor, a catalytic reaction chamber, a membrane separation device and a methanol synthesis device connected in sequence, wherein the reactor is used for gasifying or pyrolyzing solid waste, the catalytic reaction chamber is used for catalytically cracking the tar component in the synthesis gas produced by gasification or pyrolysis under preset catalytic cracking conditions, the membrane separation device is used for separating and purifying the mixed gas produced by catalytic cracking, and the methanol synthesis device is used for synthesizing the separated and purified hydrogen and carbon dioxide under the catalytic action of a photothermal catalyst to obtain green methanol.

[0007] In one embodiment, a feeding device is further included, wherein the feeding device is connected to the reaction furnace and is used to transport solid waste to the reaction furnace.

[0008] In one embodiment, an oxygen supply device is further included, which is connected to the reaction furnace and is used to supply oxygen to the reaction furnace during gasification.

[0009] In one embodiment, the preset catalytic cracking conditions include: a temperature of 650-900° C., and a catalyst of metal oxide.

[0010] In one embodiment, the metal oxide is calcium oxide or aluminum oxide.

[0011] In one embodiment, a heat exchange device is further included, which is connected to the catalytic reaction chamber and the membrane separation device respectively, and is used to absorb the heat of the mixed gas so that the temperature of the mixed gas entering the membrane separation device is 20-150°C.

[0012] In one embodiment, the membrane separation device is a ceramic membrane, a glass membrane, a metal membrane or a molecular sieve membrane.

[0013] In one embodiment, it also includes a first storage tank and a second storage tank, the first storage tank is connected to the membrane separation device and the methanol synthesis device respectively, and the second storage tank is connected to the methanol synthesis device, the first storage tank is used to store hydrogen and carbon dioxide, and the second storage tank is used to store green methanol.

[0014] In one embodiment, a third storage tank and a heating furnace are further included. The third storage tank is connected to the membrane separation device and the heating furnace respectively. The third storage tank is used to store methane and carbon monoxide. The heating furnace is used to heat the reaction furnace and / or the methanol synthesis device using the heat generated by the combustion of methane and carbon monoxide.

[0015] In one embodiment, the heat exchange device is used to heat the reaction furnace and / or the methanol synthesis device using the absorbed heat, and the temperature of the methanol synthesis device is 50-200°C.

[0016] This utility model provides a system for producing green methanol from solid waste syngas. The system processes the syngas produced by gasification or pyrolysis by catalytically cracking tar, then utilizes a membrane separation device to directionally recover carbon dioxide and hydrogen. Furthermore, under certain light and temperature conditions, photothermal synergistic catalytic conversion of the syngas into green methanol effectively removes tar components from the syngas and converts them into high-value-added green methanol, thereby achieving efficient resource utilization of the gasification / pyrolysis syngas. Therefore, the above technical solution can effectively degrade tar and reduce the energy consumption of producing green methanol. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of a system for preparing green methanol using solid waste synthesis gas provided by one embodiment of the present invention.

[0019] Reference numerals:

[0020] 1-Reaction furnace; 2-Catalytic reaction chamber; 3-Membrane separation device; 4-Methanol synthesis device; 5-Feeding device; 6-Oxygen supply device; 7-Heat exchange device; 8-First storage tank; 9-Second storage tank; 10-Third storage tank; 11-Heating furnace. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, an embodiment of the present invention provides a system for preparing green methanol by utilizing solid waste synthesis gas, comprising a reactor 1, a catalytic reaction chamber 2, a membrane separation device 3 and a methanol synthesis device 4 connected in sequence, wherein the reactor 1 is used for gasifying or pyrolyzing solid waste, the catalytic reaction chamber 2 is used for catalytically cracking the tar component in the synthesis gas produced by gasification or pyrolysis under preset catalytic cracking conditions, the membrane separation device 3 is used for separating and purifying the mixed gas produced by catalytic cracking, and the methanol synthesis device 4 is used for synthesizing the separated and purified hydrogen and carbon dioxide under the catalytic action of a photothermal catalyst to obtain green methanol.

[0023] In this embodiment, syngas produced by gasification or pyrolysis is treated by catalytic cracking of tar. Membrane separation device 3 is then used to directionally recover carbon dioxide and hydrogen. Furthermore, under certain light and temperature conditions, photothermal synergistic catalytic conversion to green methanol is performed. This effectively removes the tar component from the syngas and converts it into high-value-added green methanol, thereby achieving efficient resource utilization of the gasification / pyrolysis syngas. Therefore, this technical solution can effectively degrade tar and reduce the energy consumption of producing green methanol.

[0024] In one embodiment of the present invention, the system further comprises a feeding device 5 , which is connected to the reaction furnace 1 and is used to transport solid waste to the reaction furnace 1 .

[0025] In one embodiment of the present invention, the system further includes an oxygen supply device 6 , which is connected to the reaction furnace 1 and is used to supply oxygen to the reaction furnace 1 during gasification.

[0026] It should be noted that when the reactor is performing pyrolysis, there is no need to supply oxygen to the reactor 1 .

[0027] In one embodiment of the present invention, the preset catalytic cracking conditions include: a temperature of 650-900° C., and a catalyst of metal oxide.

[0028] In one embodiment of the present invention, the metal oxide is calcium oxide or aluminum oxide, and the specific type of the metal oxide is not limited herein. Optionally, the metal oxide is calcium oxide. The technical solution provided by the present invention utilizes calcium oxide catalytic cracking technology to treat tar in synthesis gas, thereby solving equipment corrosion problems, improving the quality and usability of the gas product, reducing production costs, and achieving synthesis gas impurity removal and efficient utilization of carbon resources.

[0029] In one embodiment of the present invention, the above system also includes a heat exchange device 7, which is connected to the catalytic reaction chamber 2 and the membrane separation device 3 respectively, and is used to absorb the heat of the mixed gas so that the temperature of the mixed gas entering the membrane separation device 3 is 20~150℃.

[0030] In one embodiment of the present invention, the membrane separation device 3 is a ceramic membrane, a glass membrane, a metal membrane or a molecular sieve membrane, and the specific type of the membrane separation device 3 is not limited here. Optionally, the membrane separation device 3 is a molecular sieve membrane. The technical solution provided by the present invention applies membrane separation technology to the synthesis gas treatment process, simultaneously separates and purifies hydrogen and carbon dioxide, and couples the heat released by the combustion of combustible gases such as methane and carbon monoxide in the synthesis gas to efficiently synthesize green methanol. The internal raw materials of the system are recycled, which reduces the demand for external raw materials and improves the resource self-sufficiency rate of the entire process; compared with the traditional methanol synthesis process that requires additional heat supply, this method significantly reduces the overall energy consumption and improves economic benefits.

[0031] In one embodiment of the present invention, the above-mentioned system also includes a first storage tank 8 and a second storage tank 9. The first storage tank 8 is connected to the membrane separation device 3 and the methanol synthesis device 4 respectively, and the second storage tank 9 is connected to the methanol synthesis device 4. The first storage tank 8 is used to store hydrogen and carbon dioxide, and the second storage tank 9 is used to store green methanol.

[0032] In one embodiment of the present invention, the above-mentioned system also includes a third storage tank 10 and a heating furnace 11. The third storage tank 10 is connected to the membrane separation device 3 and the heating furnace 11 respectively. The third storage tank 10 is used to store methane and carbon monoxide. The heating furnace 11 is used to use the heat generated by the combustion of methane and carbon monoxide to heat the reactor 1 and / or the methanol synthesis device 4.

[0033] In one embodiment of the present invention, the heat exchange device 7 is used to utilize the absorbed heat to heat the reactor 1 and / or the methanol synthesis device 4, and the temperature of the methanol synthesis device 4 is 50-200°C. The technical solution provided by the present invention breaks through the high energy consumption limitation of traditional chemical catalysis by utilizing a green methanol synthesis process under the synergistic effect of light and heat, and utilizes renewable energy (solar energy) to significantly reduce carbon emissions during the production process, making methanol production more environmentally friendly and energy-saving.

[0034] In summary, the technical solution provided by this utility model organically combines the three major links of tar catalytic cracking, membrane separation and purification, and photothermal synergistic conversion to form a complete and efficient green methanol production system. This reduces the production cost of green methanol while producing more economic benefits, helping to promote the realization of the "dual carbon" goals. Compared with the synthesis gas processing technology mentioned in the background technology, this solution embodies the principles of a circular economy, minimizes waste generation, and converts all raw materials into useful products or energy forms. It shows great potential in environmental protection, efficient resource utilization, and economic feasibility, and helps promote society's sustainable development goals.

[0035] It should be noted that, in this article, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical factors in the process, method, article or device comprising the elements.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A system for producing green methanol using solid waste synthesis gas, characterized in that: The invention comprises a reaction furnace (1), a catalytic reaction chamber (2), a membrane separation device (3) and a methanol synthesis device (4) connected in sequence, wherein the reaction furnace (1) is used for gasifying or pyrolyzing solid waste, the catalytic reaction chamber (2) is used for catalytically cracking tar components in the synthesis gas produced by gasification or pyrolysis under preset catalytic cracking conditions, the membrane separation device (3) is used for separating and purifying the mixed gas produced by catalytic cracking, and the methanol synthesis device (4) is used for synthesizing hydrogen and carbon dioxide obtained by separation and purification under the catalytic action of a photothermal catalyst to obtain green methanol.

2. The system for preparing green methanol using solid waste synthesis gas according to claim 1, characterized in that: It also includes a feeding device (5), which is connected to the reaction furnace (1) and is used to transport solid waste to the reaction furnace (1).

3. The system for preparing green methanol using solid waste synthesis gas according to claim 1, characterized in that: It also includes an oxygen supply device (6), which is connected to the reaction furnace (1) and is used to supply oxygen to the reaction furnace (1) during gasification.

4. The system for producing green methanol using solid waste synthesis gas according to claim 1, characterized in that: The preset catalytic cracking conditions include: a temperature of 650-900° C. and a catalyst of metal oxide.

5. The system for preparing green methanol using solid waste synthesis gas according to claim 4 is characterized in that: The metal oxide is calcium oxide or aluminum oxide.

6. The system for producing green methanol using solid waste synthesis gas according to claim 4, characterized in that: The invention also includes a heat exchange device (7), which is connected to the catalytic reaction chamber (2) and the membrane separation device (3) respectively, and is used to absorb the heat of the mixed gas so that the temperature of the mixed gas entering the membrane separation device (3) is 20 to 150°C.

7. The system for producing green methanol using solid waste synthesis gas according to claim 6, characterized in that: The membrane separation device (3) is a ceramic membrane, a glass membrane, a metal membrane or a molecular sieve membrane.

8. The system for producing green methanol using solid waste synthesis gas according to claim 6, characterized in that: The invention also includes a first storage tank (8) and a second storage tank (9), wherein the first storage tank (8) is connected to the membrane separation device (3) and the methanol synthesis device (4) respectively, and the second storage tank (9) is connected to the methanol synthesis device (4). The first storage tank (8) is used to store hydrogen and carbon dioxide, and the second storage tank (9) is used to store green methanol.

9. The system for producing green methanol by utilizing solid waste synthesis gas according to any one of claims 6 to 8, characterized in that: The invention also includes a third storage tank (10) and a heating furnace (11), wherein the third storage tank (10) is connected to the membrane separation device (3) and the heating furnace (11), respectively. The third storage tank (10) is used to store methane and carbon monoxide, and the heating furnace (11) is used to heat the reaction furnace (1) and / or the methanol synthesis device (4) by utilizing the heat generated by the combustion of methane and carbon monoxide.

10. The system for producing green methanol using solid waste synthesis gas according to claim 9, characterized in that: The heat exchange device (7) is used to heat the reaction furnace (1) and / or the methanol synthesis device (4) using the absorbed heat, and the temperature of the methanol synthesis device (4) is 50-200°C.

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