Production system for preparing green aviation oil and co-producing green methanol

Abstract

The utility model provides a production system for preparing green aviation fuel and co-producing green methanol. The production system comprises a biomass gasification unit, a gas-liquid separation unit, a gas-liquid separation unit and a gas-liquid separation unit, wherein the biomass gasification unit is used for pyrolyzing and gasifying biomass and generating synthesis gas and CO2 gas; the electrolyzed water unit comprises an electrolytic bath for electrolyzing water to generate oxygen and hydrogen; the aviation oil synthesis unit comprises an oil product synthesis device and an oil product processing device, and the biomass gasification unit and the electrolytic cell are respectively connected with the oil product synthesis device, so that synthesis gas and hydrogen are conveyed to the oil product synthesis device to be processed into an intermediate oil product; the electrolytic bath and the oil product synthesis device are respectively connected with the oil product processing device, so that the intermediate oil product and the hydrogen are conveyed to the oil product processing device to be processed into aviation oil; and the methanol synthesis unit is connected with the biomass gasification unit and the electrolytic cell and is used for synthesizing methanol from CO2 gas and hydrogen. The green aviation fuel and the green methanol with high added values are simultaneously prepared by taking the biomass as a carbon source, so that the emission of carbon dioxide can be greatly reduced, and good economic benefits and environmental protection benefits are achieved.

Description

Technical Field

[0001] This application relates to the technical field of energy and chemical engineering, and in particular to a production system for producing green methanol from green aviation fuel. Background Technology

[0002] Currently, coal-based energy and chemical polygeneration technologies do not consider the resource utilization of carbon dioxide, including how to control and reduce the carbon dioxide produced during coal conversion and combustion, and how to utilize it as a resource. Due to the stable chemical properties of carbon dioxide, coal-based near-zero emission polygeneration systems cannot achieve carbon dioxide emission reduction during production. They can only solve this problem by using capture and storage methods, which are costly and cannot truly reduce carbon dioxide emissions in quantity to achieve near-zero carbon dioxide emissions during production. Utility Model Content

[0003] This application aims to at least partially address one of the technical problems in the related art.

[0004] Therefore, the purpose of this application is to propose a production system for the co-production of green aviation fuel and green methanol, which uses biomass as a carbon source to simultaneously produce high-value-added green aviation fuel and green methanol, thereby significantly reducing carbon dioxide emissions and achieving good economic and environmental benefits.

[0005] To achieve the above objectives, this application proposes a production system for preparing green aviation fuel and co-producing green methanol, including a biomass gasification unit, which is used to pyrolyze and gasify biomass to produce syngas and CO2 gas.

[0006] An electrolysis water unit includes an electrolyzer for electrolyzing water to generate oxygen and hydrogen, wherein the electrolyzer is connected to the biomass gasification unit to utilize oxygen for pyrolysis and gasification of the biomass;

[0007] A jet fuel synthesis unit includes a fuel synthesis apparatus and a fuel processing apparatus, wherein the biomass gasification unit and the electrolyzer are respectively connected to the fuel synthesis apparatus to supply the synthesis gas and hydrogen to the fuel synthesis apparatus for processing into intermediate fuel products; the electrolyzer and the fuel synthesis apparatus are respectively connected to the fuel processing apparatus to supply the intermediate fuel products and hydrogen to the fuel processing apparatus for processing into jet fuel; and

[0008] A methanol synthesis unit, which is connected to the biomass gasification unit and the electrolyzer, is used to synthesize methanol from CO2 gas and hydrogen.

[0009] In some embodiments, the biomass gasification unit includes a gasifier and a purification and decarbonization device connected in sequence upstream and downstream, wherein the gasifier is connected to the electrolytic cell to gasify biomass to produce crude syngas; wherein the crude syngas enters the purification and decarbonization device for purification to obtain syngas and CO2 gas; the purification and decarbonization device is connected to the oil synthesis unit and the methanol synthesis unit respectively.

[0010] In some embodiments, the methanol synthesis unit includes a methanol synthesis tower and a methanol distillation tower arranged sequentially upstream and downstream, wherein the methanol synthesis tower is connected to the purification and decarbonization device and the electrolytic cell respectively, for synthesizing crude methanol from hydrogen and CO2 gas; the crude methanol is fed to the methanol distillation tower for distillation to obtain methanol.

[0011] In some embodiments, the wastewater generated by the methanol synthesis unit is treated and then transported to the electrolytic cell for electrolysis.

[0012] In some embodiments, the water electrolysis unit further includes a power supply unit, wherein the power supply unit is a wind and solar power generation component to provide green electricity to the water electrolysis unit.

[0013] In some embodiments, the water electrolysis unit further includes a hydrogen storage tank; the hydrogen storage tank is connected to the electrolyzer and is used to store the hydrogen produced by the electrolyzer.

[0014] In some embodiments, the oil processing apparatus is connected to the hydrogen storage tank to hydrogenate the intermediate oil to produce aviation fuel.

[0015] In some embodiments, the synthetic water generated by the oil processing apparatus is treated and then transported to the electrolytic cell for electrolysis.

[0016] In some embodiments, the methanol distillation column includes a pre-distillation column, a pressurized distillation column, and an atmospheric distillation column arranged sequentially upstream and downstream.

[0017] In some embodiments, the wind and solar power generation components include a wind power generation device and a photovoltaic power generation device, both of which are connected to the electrolyzer to provide green electricity to the electrolyzer.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0020] Figure 1This is a schematic diagram of the structure of a production system for preparing green aviation fuel and co-producing green methanol according to an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the structure of a production system for preparing green aviation fuel and co-producing green methanol according to an embodiment of this application;

[0022] In the diagram, 1 is the power supply unit; 2 is the gasifier; 3 is the electrolyzer; 4 is the hydrogen storage tank; 5 is the purification and decarbonization device; 6 is the oil synthesis device; 7 is the oil processing device; 8 is the methanol synthesis tower; and 9 is the methanol distillation tower. Detailed Implementation

[0023] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0024] See Figures 1-2 To achieve the above objectives, this application proposes a production system for preparing green aviation fuel and co-producing green methanol, comprising: a biomass gasification unit, a water electrolysis unit, an aviation fuel synthesis unit, and a methanol synthesis unit; wherein the biomass gasification unit is used to pyrolyze and gasify biomass to produce syngas and CO2 gas; the water electrolysis unit includes an electrolyzer 3 for electrolyzing water to generate oxygen and hydrogen, wherein the electrolyzer 3 is connected to the biomass gasification unit to utilize oxygen to pyrolyze and gasify biomass; the aviation fuel synthesis unit includes an oil synthesis device 6 and an oil processing device 7, wherein the biomass gasification unit and the electrolyzer 3 are respectively connected to the oil synthesis device 6 to transport syngas and hydrogen to the oil synthesis device 6 for processing into intermediate oil products; the electrolyzer 3 and the oil synthesis device 6 are respectively connected to the oil processing device 7 to transport intermediate oil products and hydrogen to the oil processing device 7 for processing into aviation fuel; the methanol synthesis unit is connected to the biomass gasification unit and the electrolyzer 3 to synthesize methanol from CO2 gas and hydrogen.

[0025] In this embodiment, biomass is used as raw material. In the biomass gasification unit, the biomass is pyrolyzed and gasified in the electrolysis of water in electrolyzer 3 to produce syngas and CO2. The syngas enters the oil synthesis unit 6 and mixes with hydrogen produced from the electrolysis of water in electrolyzer 3 for a Fischer-Tropsch synthesis reaction to obtain intermediate oil. The intermediate oil enters the oil processing unit 7 and mixes with hydrogen produced from the electrolysis of water in electrolyzer 3 for a hydrorefining reaction. The reaction products are fractionated, and the aviation fuel fraction undergoes an isomerization reaction to obtain aviation fuel. The refined tail oil undergoes a hydrocracking reaction to obtain aviation fuel. The CO2 gas output from the biomass gasification unit enters the methanol synthesis unit and reacts with hydrogen produced from the electrolysis of water in electrolyzer 3, followed by distillation to obtain methanol.

[0026] In the example, the syngas outlet of the biomass gasification unit is connected to the syngas inlet of the oil synthesis unit 6; the discharge port of the oil synthesis unit 6 is connected to the feed port of the oil processing unit 7; the hydrogen outlet of the electrolyzer 3 is connected to the hydrogen inlet of the oil processing unit 7; the catalyst used in the oil synthesis unit 6 is an iron-based or cobalt-based Fischer-Tropsch synthesis catalyst; the reactor used in the oil synthesis unit 6 is one of a fixed-bed reactor, a high-temperature slurry-bed reactor, a circulating fluidized-bed reactor, or a fixed fluidized-bed reactor.

[0027] The syngas output from the biomass gasification unit and the hydrogen produced by the electrolyzer 3 reach a certain hydrogen-to-carbon ratio and are then sent to the oil synthesis unit 6 for Fischer-Tropsch synthesis. The Fischer-Tropsch synthesis reaction can be carried out using a high-temperature slurry bed reactor. The syngas is converted into intermediate oil products through an activated iron-based catalyst and sent to the oil processing unit 7. Under the action of a catalyst, the intermediate oil products undergo hydrorefining. After fractionation, the aviation fuel fraction is used to obtain aviation fuel through an isomerization reaction, and the refined tail oil is used to obtain green aviation fuel through a hydrocracking reaction.

[0028] In some embodiments, the synthetic water outlet of the oil processing unit 7 is connected to the water inlet of the electrolyzer 3; the synthetic water, a byproduct of the synthesis reaction in this process, is treated and then sent to the electrolyzer 3 as a raw material for hydrogen production by water electrolysis.

[0029] In some embodiments, after the Fischer-Tropsch synthesis reaction is carried out in the oil synthesis unit 6, the carbon dioxide removed by the tail gas decarbonization unit and the CO2 gas emitted by the purification and decarbonization unit 5 are used as raw materials for the synthesis of green methanol.

[0030] Therefore, in this embodiment, the biomass gasification unit and electrolyzer 3 are coupled, utilizing biomass gasification to produce syngas, which is then reacted with hydrogen via Fischer-Tropsch synthesis to obtain green aviation fuel. Simultaneously, the CO2 produced by biomass gasification reacts with hydrogen to synthesize methanol. In this embodiment, the oxygen produced by electrolyzer 3 is used as a gasifying agent in biomass gasification, solving the problem of comprehensive utilization of oxygen (a byproduct of electrolyzer 3), synthesis wastewater, and CO2 (a waste gas from biomass gasification). Therefore, this embodiment produces high-value-added green aviation fuel and green methanol, significantly reducing CO2 emissions compared to related technologies, demonstrating excellent economic and environmental benefits.

[0031] In some embodiments, the biomass gasification unit includes a gasifier 2 and a purification and decarbonization device 5 connected upstream and downstream in sequence. The gasifier 2 is connected to an electrolytic cell 3 to gasify biomass to produce crude syngas. The crude syngas enters the purification and decarbonization device 5 for purification to obtain syngas and CO2 gas. The purification and decarbonization device 5 is connected to an oil synthesis unit 6 and a methanol synthesis unit, respectively.

[0032] The biomass gasification unit includes a gasifier 2 and a purification and decarbonization device 5. The oxygen outlet of the electrolytic cell 3 is connected to the oxygen inlet of the gasifier 2, and the gas outlet of the gasifier 2 is connected to the gas inlet of the purification and decarbonization device 5. The gasifier 2 is in the form of a fixed bed and / or a fluidized bed, which is used to receive biomass materials and use the oxygen output from the electrolytic cell 3 as a gasifying agent to carry out pyrolysis, combustion and other reactions to obtain crude syngas.

[0033] For example, the biomass is the shaped pellet material from the biomass pellet processing plant, such as corn stalks. It is conveyed and connected to the feed inlet of the gasifier 2. The oxygen outlet of the electrolysis cell 3 is connected to the oxygen inlet of the gasifier 2. The gas outlet of the gasifier 2 is connected to the gas inlet of the purification and decarbonization device 5. The crude syngas enters the purification and decarbonization device 5 to remove impurities such as sulfides and carbon dioxide to obtain purified syngas and CO2 gas. The syngas outlet of the purification and decarbonization device 5 is connected to the oil synthesis unit 6, and the CO2 gas outlet of the purification and decarbonization device 5 is connected to the methanol synthesis unit.

[0034] In some embodiments, the methanol synthesis unit includes a methanol synthesis tower 8 and a methanol distillation tower 9 arranged sequentially upstream and downstream. The methanol synthesis tower 8 is connected to a purification and decarbonization device 5 and an electrolytic cell 3, respectively, to synthesize crude methanol from hydrogen and CO2 gas. The crude methanol is then fed to the methanol distillation tower 9 for distillation to obtain methanol.

[0035] The methanol synthesis unit includes a methanol synthesis tower 8 and a methanol distillation tower 9. The hydrogen outlet of the electrolyzer 3 is connected to the hydrogen inlet of the methanol synthesis tower 8. The CO2 gas outlet of the purification and decarbonization unit 5 is connected to the CO2 gas inlet of the methanol synthesis tower 8. The outlet of the methanol synthesis tower 8 is connected to the inlet of the methanol distillation tower 9. The catalyst used in the example methanol synthesis tower 8 is a copper-based or zinc-chromium-based methanol synthesis catalyst, and the reactor of the methanol synthesis tower 8 is either an ICI quench type or a Lurgi shell-and-tube type. The hydrogen produced by the electrolyzer 3 and the CO2 gas output from the purification and decarbonization unit 5 are mixed in a certain proportion in the methanol synthesis tower 8 and reacted under the action of the catalyst to obtain crude methanol. The crude methanol from the methanol synthesis tower 8 is preheated and then enters the methanol distillation tower 9. The methanol distillation tower 9 reactor can be a single tower, a double tower, or a multi-tower reactor. For example, a three-tower series process of pre-distillation tower, pressurized distillation tower, and atmospheric distillation tower can be used to distill and separate methanol to obtain green pure methanol.

[0036] In some embodiments, the wastewater generated from the methanol synthesis reaction in the methanol synthesis unit is treated and then fed into the electrolyzer 3 as a raw material for hydrogen production via water electrolysis. For example, the outlet of the methanol distillation column 9 is connected to the inlet of the electrolyzer 3 to send the wastewater generated from the methanol synthesis reaction into the electrolyzer 3. Therefore, this embodiment solves the problem of comprehensive utilization of the byproduct oxygen, biomass gasification waste gas CO2, and reaction wastewater from the electrolyzer 3, and produces high-value-added green methanol.

[0037] In some embodiments, the water electrolysis unit further includes a power supply unit 1, wherein the power supply unit 1 is a wind and solar power generation component to provide green electricity to the water electrolysis unit.

[0038] The water electrolysis unit also includes a power supply unit 1. In this embodiment, the water electrolysis unit includes a power supply unit 1 and an electrolysis cell 3. The electrolysis cell 3 is an alkaline water electrolysis cell 3. The power supply unit 1 provides the electrolysis energy to the electrolysis cell 3. The wind and solar power generation components include a wind power generation device and a photovoltaic power generation device, both of which are connected to the electrolysis cell 3 to provide green energy to the electrolysis cell 3.

[0039] In some embodiments, the water electrolysis unit further includes a hydrogen storage tank 4; the hydrogen storage tank 4 is connected to the electrolyzer 3 to store the hydrogen produced by the electrolyzer 3. For example, the hydrogen storage tank 4 is one or more combinations of gaseous hydrogen storage, liquid hydrogen storage, and solid hydrogen storage, with a pressure of approximately 1.6 MPa. The hydrogen inlet of the hydrogen storage tank 4 is connected to the electrolyzer 3, and its outlet is connected to the oil processing unit 7 for mixing with intermediate oil products, thereby hydrogenating the intermediate oil products to produce aviation fuel. When the wind power and photovoltaic power generation devices generate sufficient electricity, the hydrogen production of electrolyzer 3 exceeds the hydrogen consumption, and the excess hydrogen is stored in hydrogen storage tank 4. Conversely, when the wind power and photovoltaic power generation devices generate insufficient electricity, the hydrogen production is less than the hydrogen consumption, and hydrogen storage tank 4 contains hydrogen, which can be released from hydrogen storage tank 4 to supplement the hydrogen consumption. However, when all the hydrogen in hydrogen storage tank 4 is released and the hydrogen production is still insufficient, the external power grid of electrolyzer 3 can be used to maintain the normal operation of electrolyzer 3 and ensure the minimum operating load hydrogen consumption of aviation fuel synthesis unit and methanol synthesis unit.

[0040] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0041] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in at least one embodiment or example.

[0043] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A production system for producing green aviation fuel and co-producing green methanol, characterized in that, include A biomass gasification unit is used to pyrolyze and gasify biomass to produce syngas and CO2 gas. An electrolysis water unit includes an electrolyzer for electrolyzing water to generate oxygen and hydrogen, wherein the electrolyzer is connected to the biomass gasification unit to utilize oxygen for pyrolysis and gasification of the biomass; A jet fuel synthesis unit includes a fuel synthesis device and a fuel processing device, wherein the biomass gasification unit and the electrolyzer are respectively connected to the fuel synthesis device to supply the synthesis gas and hydrogen to the fuel synthesis device for processing into intermediate fuel; the electrolyzer and the fuel synthesis device are respectively connected to the fuel processing device to supply the intermediate fuel and hydrogen to the fuel processing device for processing into jet fuel; as well as A methanol synthesis unit, which is connected to the biomass gasification unit and the electrolyzer, is used to synthesize methanol from CO2 gas and hydrogen.

2. The production system according to claim 1, characterized in that, The biomass gasification unit includes a gasifier and a purification and decarbonization device connected in sequence upstream and downstream. The gasifier is connected to the electrolytic cell to gasify biomass to produce crude syngas. The crude syngas enters the purification and decarbonization device for purification to obtain syngas and CO2 gas. The purification and decarbonization device is connected to the oil synthesis unit and the methanol synthesis unit respectively.

3. The production system according to claim 2, characterized in that, The methanol synthesis unit includes a methanol synthesis tower and a methanol distillation tower arranged sequentially upstream and downstream. The methanol synthesis tower is connected to the purification and decarbonization device and the electrolytic cell, respectively, to synthesize crude methanol from hydrogen and CO2 gas. The crude methanol is then fed to the methanol distillation tower for distillation to obtain methanol.

4. The production system according to any one of claims 1-3, characterized in that, The wastewater generated by the methanol synthesis unit is treated and then transported to the electrolytic cell for electrolysis.

5. The production system according to claim 4, characterized in that, The water electrolysis unit also includes a power supply unit, wherein the power supply unit is a wind and solar power generation component to provide green electricity to the water electrolysis unit.

6. The production system according to claim 5, characterized in that, The water electrolysis unit also includes a hydrogen storage tank; the hydrogen storage tank is connected to the electrolyzer and is used to store the hydrogen produced by the electrolyzer.

7. The production system according to claim 6, characterized in that, The oil processing unit is connected to the hydrogen storage tank to hydrogenate the intermediate oil to produce aviation fuel.

8. The production system according to claim 6, characterized in that, The synthetic water produced by the oil processing unit is treated and then transported to the electrolytic cell for electrolysis.

9. The production system according to claim 3, characterized in that, The methanol distillation column includes a pre-distillation column, a pressurized distillation column, and an atmospheric distillation column arranged sequentially upstream and downstream.

10. The production system according to claim 5, characterized in that, The wind and solar power generation components include a wind power generation device and a photovoltaic power generation device, both of which are connected to the electrolytic cell to provide green electricity to the electrolytic cell.

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