Feed gas flexible regulation and control device system for carbon dioxide hydrogenation reaction and regulation and control method of feed gas flexible regulation and control device system

Abstract

The invention provides a feed gas flexible regulation and control device system for a carbon dioxide hydrogenation reaction and a regulation and control method of the feed gas flexible regulation and control device system. The feed gas flexible regulation and control device system comprises a hydrogen feeding unit, a carbon dioxide feeding unit, a biomass gasification flexible regulation and control unit and a reaction synthesis unit, the hydrogen feeding unit, the carbon dioxide feeding unit and the biomass gasification flexible regulation and control unit are respectively and independently connected with the reaction synthesis unit; a control assembly is arranged on a pipeline for connecting the biomass gasification flexible regulation and control unit and the reaction synthesis unit; synthesis gas in the biomass gasification flexible regulation and control unit comprises carbon monoxide and hydrogen. Raw material gas supply for synthesizing green chemicals through carbon dioxide hydrogenation is flexibly adjusted by adopting synthesis gas in the biomass gasification flexible regulation and control unit, and it is guaranteed that renewable energy hydrogen production stably adapts to the chemical production process for a long time.

Description

Technical Field

[0001] This invention belongs to the field of new energy regulation technology, and relates to a flexible regulation device system and regulation method for the feed gas of carbon dioxide hydrogenation reaction. Background Technology

[0002] Fossil fuels (coal, oil, and natural gas) have provided enormous economic benefits to human society. However, in recent decades, the large-scale combustion of fossil fuels has led to a continuous increase in CO2 emissions, causing serious environmental problems such as global warming. With the widespread implementation of carbon policies and regulations worldwide, companies with carbon emissions are forced to address numerous technological and economic challenges. Therefore, researching CO2 capture and catalytic conversion technologies to utilize CO2 resources is an effective way to address the greenhouse effect, replace fossil fuels, and generate higher-value chemicals, which is of great significance for the sustainable development of global energy and the ecological environment.

[0003] The use of carbon capture technology to capture green carbon dioxide and couple it with renewable energy-based hydrogen production to produce high-value-added green chemicals offers a dual carbon reduction effect and is widely recognized globally as a future mainstream direction. Examples include the hydrogenation of carbon dioxide to produce aromatics, methanol, and olefins. This approach is an effective means of reducing the over-reliance on fossil resources in the production of aromatics and other chemicals, and reducing CO2 emissions, thus possessing significant strategic and economic importance. However, the contradiction between the volatility of renewable energy-based hydrogen production and the stability of chemical production creates a significant bottleneck in the large-scale coupling of renewable energy-based hydrogen production with downstream hydrogen chemical processes, hindering the development of the hydrogen energy chain and emerging industries. The development of this technology is directly affected by factors such as the continuous supply of green energy, hydrogen production technology, and hydrogen production costs.

[0004] Direct carbon dioxide hydrogenation to produce green chemicals has significant carbon reduction effects, but breakthroughs in related technologies are urgently needed. Extensive research has been conducted worldwide on various green product preparation technologies, but industrial-scale applications are currently scarce. For example, the global capacity of carbon dioxide hydrogenation to methanol production projects is approximately 1 million tons per year, but projects for carbon dioxide hydrogenation to aromatics and olefins are virtually nonexistent. The widespread application of these technologies is far from achieving low-carbon goals. Furthermore, green hydrogen accounts for approximately 50% of the cost of green chemicals. It is imperative to lay the groundwork for the rational utilization of these renewable energy sources.

[0005] Therefore, developing a flexible control system for producing green chemicals from carbon dioxide hydrogenation has great application prospects and can help promote the development of industries such as renewable energy hydrogen production and green chemicals. Summary of the Invention

[0006] The purpose of this invention is to provide a flexible control device system and control method for the feed gas of carbon dioxide hydrogenation reaction. The system uses syngas from a biomass gasification flexible control unit to flexibly regulate the feed gas supply for the synthesis of green chemicals from carbon dioxide hydrogenation. This ensures that the hydrogen production from renewable energy is stable and adaptable to the chemical production process in the long term, while reducing production costs and maintaining the green attributes.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a flexible control device system for the feed gas of a carbon dioxide hydrogenation reaction, the feed gas flexible control device system comprising a hydrogen feeding unit, a carbon dioxide feeding unit, a biomass gasification flexible control unit, and a reaction synthesis unit.

[0009] The hydrogen feeding unit, the carbon dioxide feeding unit, and the biomass gasification flexible control unit are each independently connected to the reaction synthesis unit;

[0010] A control component is installed on the pipeline connecting the biomass gasification flexible control unit and the reaction synthesis unit.

[0011] The syngas in the biomass gasification flexible control unit includes carbon monoxide and hydrogen.

[0012] In this invention, the control component includes a three-way valve.

[0013] This invention addresses the contradiction between the unstable supply of new energy sources and the stability of chemical production by providing a flexible control device system for the feed gas of carbon dioxide hydrogenation reaction. The system uses syngas from a biomass gasification flexible control unit to flexibly regulate the feed gas supply for the synthesis of green chemicals from carbon dioxide hydrogenation. This ensures that hydrogen production from renewable energy sources is stable and adaptable to chemical production processes in the long term. At the same time, the syngas from biomass gasification can also provide green carbon and hydrogen sources, improving the rational utilization of limited carbon sources. Furthermore, the syngas supply is more stable, reducing production costs.

[0014] It is worth noting that the carbon dioxide hydrogenation reaction process exhibits varying degrees of selectivity in the formation of carbon monoxide. Under the influence of a catalyst, carbon monoxide reacts more readily with hydrogen, which is more conducive to the formation of reaction products and improves reaction efficiency. Therefore, the carbon source in the biomass gasification syngas used is not directly emitted into the atmosphere, but is entirely used in the carbon dioxide hydrogenation reaction. In addition, the biomass gasification flexible control unit is small to medium scale, which can be implemented in more small areas, improving the environmental adaptability of carbon dioxide hydrogenation to produce green chemicals, without significantly affecting the synthesis of green chemicals.

[0015] As a preferred embodiment of the present invention, the hydrogen feeding unit includes a renewable energy hydrogen production device.

[0016] It is worth noting that renewable energy-based hydrogen production faces numerous challenges, such as the instability of renewable energy sources, the need for flexible control in coupled hydrogen production, and high production costs, leading to the abandonment and waste of a significant amount of renewable energy. Meanwhile, chemical production processes require a stable hydrogen source to avoid inefficiencies caused by changes in raw material supply or shutdowns. Therefore, utilizing control components to comprehensively match renewable energy-based hydrogen production with biomass gasification for syngas production is crucial to resolving the contradiction between unstable new energy supply and stable chemical processes.

[0017] Preferably, a first valve and a first pressure pump are sequentially installed on the pipeline connecting the hydrogen feeding unit and the reaction synthesis unit.

[0018] Preferably, the carbon dioxide feeding unit includes a carbon dioxide capture device.

[0019] Preferably, a second valve and a second pressure pump are sequentially installed on the pipeline connecting the carbon dioxide feeding unit and the reaction synthesis unit.

[0020] As a preferred technical solution of the present invention, the biomass gasification flexible control unit includes a biomass gasification reaction device, a syngas separation device, a first buffer device, and a second buffer device.

[0021] Preferably, the biomass gasification reactor is connected to the syngas separation device.

[0022] Preferably, the outlet of the syngas separation device is independently connected to a hydrogen output pipeline and a carbon monoxide output pipeline, and the hydrogen output pipeline and the carbon monoxide output pipeline are independently connected to the reaction synthesis unit.

[0023] Preferably, the hydrogen output pipeline is provided with a first buffer device, a first three-way valve and a third pressurizing pump in sequence.

[0024] Preferably, a second three-way valve and a fourth pressure pump are sequentially installed on the carbon monoxide output pipeline.

[0025] Preferably, both the first three-way valve and the second three-way valve are connected to the second buffer device.

[0026] It is worth noting that the hydrogen output pipeline and the carbon monoxide output pipeline are each independently equipped with a three-way valve. The three-way valve is used to regulate the direction of syngas flow from the biomass gasification. Specifically, when the hydrogen production of the renewable energy hydrogen production unit fluctuates, the three-way valve is connected to the reaction synthesis unit, and the syngas is used to supply the feedstock for the carbon dioxide hydrogenation reaction. When the renewable energy hydrogen production unit is running at full load, the three-way valve is connected to the second buffer device, and the syngas is used for the synthesis of other products.

[0027] As a preferred embodiment of the present invention, the reaction synthesis unit includes a raw material mixing device, a carbon dioxide hydrogenation reaction device, and a heat exchange device connected in sequence.

[0028] In this invention, a heat exchange device is installed in the reaction synthesis unit, which is dynamically controlled according to the supply of syngas in biomass gasification. When cooling is required, the heat exchange device can recover and utilize heat to reduce system energy consumption.

[0029] Preferably, a third valve is provided on the pipeline connecting the raw material mixing device and the carbon dioxide hydrogenation reactor.

[0030] Preferably, the carbon dioxide hydrogenation reactor comprises any one or a combination of at least two of a fixed bed, a fluidized bed, or a trickle bed.

[0031] In this invention, the carbon dioxide hydrogenation reactor is filled with a catalyst.

[0032] In this invention, when the existing carbon dioxide hydrogenation reactor is a fixed bed, it can be expanded by designing multiple units in parallel or in series according to the scale of the project. Alternatively, a raw material supply system with sufficient supply capacity can be designed in the early stage of project construction. When expanding a new project, only a biomass gasification flexible control unit of the corresponding scale needs to be added according to the expansion capacity, so as to realize the flexible upgrade of the entire raw material gas flexible control device system.

[0033] As a preferred embodiment of the present invention, the raw material gas flexible control device system further includes a product separation unit.

[0034] In this invention, the product obtained by the carbon dioxide hydrogenation reactor is separated by a product separation unit through distillation. The separation is carried out in stages according to the distillation range of the obtained product, and finally the desired green chemical is obtained.

[0035] Preferably, the heat exchange device is connected to the product separation unit.

[0036] In a second aspect, the present invention provides a method for flexible control of the feed gas in a carbon dioxide hydrogenation reaction, wherein the method utilizes the feed gas flexible control device system described in the first aspect, specifically including:

[0037] H2 supplied by the mixed hydrogen feed unit and CO2 supplied by the carbon dioxide feed unit are used in the reaction synthesis unit for carbon dioxide hydrogenation reaction.

[0038] The biomass gasification flexible control unit regulates the volume ratio of CO and H2 in the syngas and the amount of gas delivered based on the change in H2 provided by the feed unit.

[0039] In this invention, the biomass gasification flexible control unit can adjust the volume ratio of CO and H2 in the syngas according to different reaction products.

[0040] This invention addresses the contradiction between unstable new energy supply and stable chemical supply by providing a flexible control method for the feed gas in carbon dioxide hydrogenation reactions. When fluctuations occur in the renewable energy hydrogen production unit (the amount of H2 supplied by the feed unit does not meet the demand), the volume ratio of CO and H2 in the syngas and the flow rate of the transported gas are adjusted. Then, the control component in the flexible control unit of biomass gasification is adjusted to supply gas to the reaction synthesis unit, and the CO2 supply can be reduced accordingly based on the CO transport rate. When the renewable energy hydrogen production unit is operating at full load, there is no need to adjust the flexible control unit of biomass gasification; instead, the control component in the flexible control unit of biomass gasification is adjusted to supply gas to other devices.

[0041] As a preferred technical solution of the present invention, the regulation of the volume ratio of CO and H2 in the synthesis gas and the amount of gas transported includes the following two cases:

[0042] When the amount of H2 supplied by the feeding unit is sufficient for the carbon dioxide hydrogenation reaction, both the first three-way valve and the second three-way valve are connected to the second buffer device; or

[0043] When the amount of H2 provided by the feed unit is insufficient for the carbon dioxide hydrogenation reaction, the gasification reaction parameters in the biomass gasification reactor are adjusted, and the first three-way valve and the second three-way valve are connected to the reaction synthesis unit.

[0044] Preferably, the volume ratio of syngas CO to H2 in the biomass gasification flexible control unit is 1:(1-3), for example, it can be 1:1.2, 1:1.5, 1:1.8, 1:2, 1:2.2, 1:2.5 or 1:2.8, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0045] As a preferred technical solution of the present invention, the gasification reaction parameters include biomass type, biomass dosage, gasification reaction temperature, gasification reaction pressure, and oxidant type.

[0046] In this invention, the volume ratio of CO and H2 in the syngas and the amount of gas transported are adjusted by adjusting the gasification reaction parameters of biomass gasification.

[0047] As a preferred technical solution of the present invention, the outlet pressure of the first pressurizing pump, the second pressurizing pump, the third pressurizing pump and the fourth pressurizing pump are all ≤5MPa, for example, they can be 4.8MPa, 4.5MPa, 4.2MPa, 4MPa, 3.8MPa, 3.5MPa, 3.2MPa or 3MPa, etc., but are not limited to the listed values, other unlisted values ​​within this range are also applicable.

[0048] In this invention, the raw material gas is sequentially fed into the raw material mixing device and the carbon dioxide hydrogenation reaction device via a pressurized pump. The specific outlet pressure can be adjusted according to the reaction conditions of different products.

[0049] Preferably, the temperature of the carbon dioxide hydrogenation reaction is 300-450℃, for example, it can be 320℃, 340℃, 350℃, 360℃, 380℃, 400℃, 420℃ or 440℃, etc., but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0050] As a preferred technical solution of the present invention, the product of the carbon dioxide hydrogenation reaction includes any one of methanol, dimethyl ether, olefins or aromatics.

[0051] In this invention, the carbon dioxide hydrogenation reaction is preferably a one-step carbon dioxide hydrogenation process to produce the product.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] (1) In view of the contradiction between the unstable supply of new energy and the stability of chemical industry, this invention constructs a flexible control device system and control method for the feed gas of carbon dioxide hydrogenation reaction. The syngas in the biomass gasification flexible control unit is used to flexibly control the supply of feed gas for the synthesis of green chemicals by carbon dioxide hydrogenation. This ensures that the hydrogen production of renewable energy can be stably adapted to the chemical production process in the long term. At the same time, the device system can be flexibly expanded and upgraded, reducing production costs and maintaining green attributes.

[0054] (2) The present invention utilizes the syngas generated by biomass gasification, which provides green carbon and hydrogen sources, improves the rational utilization of limited carbon sources, and provides a more stable syngas supply with relatively low cost, thereby improving the economic efficiency of the entire system. In addition, the syngas in biomass gasification is more conducive to the synthesis of chemicals, which can improve the yield of chemicals in the system. Attached Figure Description

[0055] Figure 1 A schematic diagram of a flexible control device system for the feed gas of a carbon dioxide hydrogenation reaction provided in Example 1;

[0056] Figure 2 A schematic diagram of a flexible control device system for the feed gas of a carbon dioxide hydrogenation reaction provided in Example 2;

[0057] Among them, 1-renewable energy hydrogen production unit, 2-biomass source, 3-carbon dioxide capture unit, 4-biomass gasification reaction unit, 5-syngas separation unit, 6-first buffer unit, 7-second buffer unit, 8-raw material mixing unit, 9-first valve, 10-second valve, 11-third valve, 12-first three-way valve, 13-second three-way valve, 14-first pressurizing pump, 15-second pressurizing pump, 16-third pressurizing pump, 17-fourth pressurizing pump, 18-carbon dioxide hydrogenation reaction unit, 19-heat exchange unit, 20-product separation unit. Detailed Implementation

[0058] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0059] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the following examples are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

[0060] In the following examples and comparative examples, the carbon dioxide hydrogenation reactors were all filled with catalysts.

[0061] Example 1

[0062] This embodiment provides a flexible control device system for the feed gas of a carbon dioxide hydrogenation reaction (e.g., Figure 1 As shown), the feed gas flexible control device system includes a hydrogen feeding unit, a carbon dioxide feeding unit, a biomass gasification flexible control unit, and a reaction synthesis unit.

[0063] The syngas in the biomass gasification flexible control unit includes carbon monoxide and hydrogen.

[0064] The hydrogen feeding unit, the carbon dioxide feeding unit, and the biomass gasification flexible control unit are each independently connected to the reaction synthesis unit;

[0065] The hydrogen feeding unit includes a renewable energy hydrogen production device 1; a first valve 9 and a first pressurizing pump 14 are sequentially installed on the pipeline connecting the hydrogen feeding unit and the reaction synthesis unit;

[0066] The carbon dioxide feeding unit includes a carbon dioxide capture device 3; a second valve 10 and a second pressure pump 15 are sequentially installed on the pipeline connecting the carbon dioxide feeding unit and the reaction synthesis unit.

[0067] The biomass gasification flexible control unit includes a biomass gasification reactor 4, a syngas separation device 5, a first buffer device 6, and a second buffer device 7. The biomass gasification reactor 4 is connected to the syngas separation device 5. The outlet of the syngas separation device 5 is independently connected to a hydrogen output pipeline and a carbon monoxide output pipeline, and the hydrogen output pipeline and the carbon monoxide output pipeline are independently connected to the reaction synthesis unit. The hydrogen output pipeline is sequentially equipped with a first buffer device 6, a first three-way valve 12, and a third pressurizing pump 16. The carbon monoxide output pipeline is sequentially equipped with a second three-way valve 13 and a fourth pressurizing pump 17. Both the first three-way valve 12 and the second three-way valve 13 are connected to the second buffer device 7.

[0068] The reaction synthesis unit includes a raw material mixing device 8 and a carbon dioxide hydrogenation reaction device 18 connected in sequence; a third valve 11 is provided on the pipeline connecting the raw material mixing device 8 and the carbon dioxide hydrogenation reaction device 18.

[0069] The first pressurizing pump 14, the second pressurizing pump 15, the third pressurizing pump 16, and the fourth pressurizing pump 17 are each independently connected to the raw material mixing device 8.

[0070] Example 2

[0071] This embodiment provides a flexible control device system for the feed gas of a carbon dioxide hydrogenation reaction (e.g., Figure 2 As shown), the raw gas flexible control device system provided in Example 1 further includes the following units:

[0072] The reaction synthesis unit also includes a heat exchanger 19; the carbon dioxide hydrogenation reaction unit 18 is connected to the heat exchanger 19; the feed gas flexible control device system also includes a product separation unit 20; the heat exchanger 19 is connected to the product separation unit 20.

[0073] Example 3

[0074] This embodiment provides a device system for carbon dioxide hydrogenation reaction. Except for the absence of a syngas separation device 5, i.e., the syngas produced by the biomass gasification reaction device 4 has only one output pipeline, all other conditions are the same as in embodiment 2.

[0075] Example 4

[0076] This embodiment provides a device system for a carbon dioxide hydrogenation reaction. Except for the absence of the first pressurization pump 14, the second pressurization pump 15, the third pressurization pump 16, and the fourth pressurization pump 17, all other conditions in the device system are the same as in Embodiment 2.

[0077] Comparative Example 1

[0078] This comparative example provides a device system for a carbon dioxide hydrogenation reaction. Except for the absence of a biomass gasification flexible control unit, all other conditions in this device system are the same as in Example 2.

[0079] Application Example 1

[0080] This application example provides a method for flexible control of the feed gas in the production of aromatics from carbon dioxide hydrogenation. The method utilizes the feed gas flexible control device system provided in Example 1, and specifically includes:

[0081] The H2 provided by the renewable energy hydrogen production unit 1 and the CO2 provided by the carbon dioxide capture unit 3 are mixed in the raw material mixing unit 8, and the outlet pressure of the first pressurizing pump 14 and the second pressurizing pump 15 are both controlled to be ≤5MPa. Then, the carbon dioxide hydrogenation reaction is carried out in the carbon dioxide hydrogenation reaction unit 18 at a temperature of 350℃ to produce aromatics (n≥6). The reaction formula is shown in the following formula (I).

[0082] (6n-6)H2+(n)CO2→2nH2O+C n H 2n-6 (I)

[0083] The biomass gasification flexible control unit regulates the volume ratio of CO and H2 in the syngas generated by the biomass gasification reactor 4 and the amount of gas delivered based on the change in the amount of H2 provided by the renewable energy hydrogen production unit 1. The specific control methods include the following:

[0084] When the amount of H2 provided by the renewable energy hydrogen production unit 1 is sufficient for the carbon dioxide hydrogenation reaction, both the first three-way valve 12 and the second three-way valve 13 are connected to the second buffer device 7, and the syngas is used for other purposes; or

[0085] When the amount of H2 provided by the renewable energy hydrogen production device 1 is insufficient for the carbon dioxide hydrogenation reaction, the gasification reaction parameters in the biomass gasification reactor 4 are adjusted, and the first three-way valve 12 and the second three-way valve 13 are connected to the carbon dioxide hydrogenation reactor 18.

[0086] The gasification reaction parameters include biomass type, biomass dosage, gasification reaction temperature, gasification reaction pressure, and oxidant type.

[0087] In this application example, based on the selectivity of aromatic products, the volume ratio of CO2 to H2 in the carbon dioxide hydrogenation reaction needs to be controlled at 1:(2-4). Correspondingly, the volume ratio of CO to H2 in the syngas needs to be controlled in the range of 1:(2-3). The amount of syngas transported is adjusted according to the required amount of H2.

[0088] In this application example, the supply of syngas in the biomass gasification flexible control unit is flexibly adjusted to regulate the feedstock gas supply for the synthesis of green chemicals from carbon dioxide hydrogenation. This ensures that hydrogen production from renewable energy is stable and adaptable to the chemical production process in the long term, while reducing production costs and improving the efficiency of carbon dioxide hydrogenation reaction.

[0089] Application Example 2

[0090] This application example provides a method for flexible control of the feed gas in the production of methanol from carbon dioxide hydrogenation. The method utilizes the feed gas flexible control device system provided in Example 2, and specifically includes:

[0091] H2 provided by renewable energy hydrogen production unit 1 and CO2 provided by carbon dioxide capture unit 3 are mixed in raw material mixing unit 8, and the outlet pressure of the first pressurizing pump 14 and the second pressurizing pump 15 are both controlled to be ≤5MPa. Then, the carbon dioxide hydrogenation reaction is carried out in carbon dioxide hydrogenation reaction unit 18 at a temperature of 300℃ to produce methanol. The reaction formula is shown in the following formula (II).

[0092] 3H₂ + CO₂ → H₂O + CH₃OH (II)

[0093] The biomass gasification flexible control unit regulates the volume ratio of CO and H2 in the syngas generated by the biomass gasification reactor 4 and the amount of gas delivered based on the change in the amount of H2 provided by the renewable energy hydrogen production unit 1. The specific control methods include the following:

[0094] When the renewable energy hydrogen production unit 1 provides 5000t H2 and the carbon dioxide capture unit 3 provides 44000t CO2, i.e., when the renewable energy hydrogen production unit 1 is operating at full load, then the first three-way valve 12 and the second three-way valve 13 are both connected to the second buffer device 7, and the syngas is used for other purposes; or

[0095] When the renewable energy hydrogen production unit 1 experiences fluctuations and can only provide 20% H2 source (1000t H2), the gasification reaction parameters in the biomass gasification reactor 4 are adjusted, and the first three-way valve 12 and the second three-way valve 13 are connected to the carbon dioxide hydrogenation reactor 18.

[0096] The gasification reaction parameters include biomass type, biomass dosage, gasification reaction temperature, gasification reaction pressure, and oxidant type.

[0097] In this application example, the flexible control of the volume ratio of CO and H2 in the biomass gasification syngas and the amount of gas delivered includes, but is not limited to, the following situations:

[0098] (a) By adjusting the gasification reaction parameters, the volume ratio of CO to H2 in the syngas is made to be 1:2.5, and 4000t H2 and 22400t CO are respectively supplied to the carbon dioxide hydrogenation reactor 18; or

[0099] (b) By adjusting the gasification reaction parameters, the volume ratio of CO to H2 in the syngas is made to be 1:2, and 4000tH2 and 28000tCO are respectively supplied to the carbon dioxide hydrogenation reactor 18; or

[0100] (c) By adjusting the gasification reaction parameters, the volume ratio of CO to H2 in the syngas is made to be 1:1.5, and 4000t H2 and 37300t CO are respectively supplied to the carbon dioxide hydrogenation reactor 18; or

[0101] (d) By adjusting the gasification reaction parameters, the volume ratio of CO and H2 in the syngas is made to be 1:1, and 4000tH2 and 56000tCO are respectively delivered to the carbon dioxide hydrogenation reactor 18.

[0102] In this application example, the CO2 supply is reduced accordingly based on the CO delivery volume.

[0103] In this application example, the supply of syngas in the biomass gasification flexible control unit is flexibly adjusted to regulate the feedstock gas supply for the synthesis of green chemicals from carbon dioxide hydrogenation. This ensures that hydrogen production from renewable energy is stable and adaptable to the chemical production process in the long term, while reducing production costs and improving the efficiency of carbon dioxide hydrogenation reaction.

[0104] Application Example 3

[0105] This application example provides a method for flexibly controlling the feed gas in the production of methanol by carbon dioxide hydrogenation reaction. The method is carried out using the feed gas flexible control device system provided in Example 3, and the feed gas flexible control method is the same as in Application Example 2.

[0106] In this application example, because the mixture of CO and H2 in the synthesis gas is connected to the raw material mixing device through only one pipeline, it is impossible to control the amount of CO and H2 introduced in real time and with precision.

[0107] Application Example 4

[0108] This application example provides a method for flexibly controlling the feed gas in the production of methanol by carbon dioxide hydrogenation reaction. The method is carried out using the feed gas flexible control device system provided in Example 4, and the feed gas flexible control method is the same as in Application Example 2.

[0109] In this application example, the lack of a first, second, third, and fourth pressurizing pump resulted in low efficiency and reduced conversion rate of the carbon dioxide hydrogenation reaction.

[0110] Comparative Application Example 1

[0111] This comparative application example provides a method for producing methanol by carbon dioxide hydrogenation reaction, using the apparatus system provided in Comparative Example 1, with all other conditions being the same as in Application Example 2.

[0112] In this comparative application example, because the device system is not equipped with a flexible control unit for biomass gasification, when the renewable energy hydrogen production device experiences fluctuations, the efficiency of carbon dioxide hydrogenation is low due to changes in feedstock supply or shutdown, which in turn leads to a decrease in yield and high economic losses.

[0113] The applicant declares that the detailed structural features of the present invention are illustrated through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions for the components selected in the present invention, additions of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A flexible control device system for the feed gas in a carbon dioxide hydrogenation reaction, characterized in that, The feed gas flexible control device system includes a hydrogen feeding unit, a carbon dioxide feeding unit, a biomass gasification flexible control unit, and a reaction synthesis unit. The hydrogen feeding unit, the carbon dioxide feeding unit, and the biomass gasification flexible control unit are each independently connected to the reaction synthesis unit; A control component is installed on the pipeline connecting the biomass gasification flexible control unit and the reaction synthesis unit. The syngas in the biomass gasification flexible control unit includes carbon monoxide and hydrogen.

2. The feed gas flexible control device system according to claim 1, characterized in that, The hydrogen feeding unit includes a renewable energy hydrogen production device; Preferably, a first valve and a first pressure pump are sequentially installed on the pipeline connecting the hydrogen feeding unit and the reaction synthesis unit; Preferably, the carbon dioxide feeding unit includes a carbon dioxide capture device; Preferably, a second valve and a second pressure pump are sequentially installed on the pipeline connecting the carbon dioxide feeding unit and the reaction synthesis unit.

3. The raw gas flexible control device system according to claim 1 or 2, characterized in that, The biomass gasification flexible control unit includes a biomass gasification reactor, a syngas separation device, a first buffer device, and a second buffer device. Preferably, the biomass gasification reactor is connected to the syngas separator; Preferably, the outlet of the syngas separation device is independently connected to a hydrogen output pipeline and a carbon monoxide output pipeline, and the hydrogen output pipeline and the carbon monoxide output pipeline are independently connected to the reaction synthesis unit. Preferably, the hydrogen output pipeline is provided with a first buffer device, a first three-way valve and a third pressurizing pump in sequence; Preferably, a second three-way valve and a fourth pressure pump are sequentially installed on the carbon monoxide output pipeline; Preferably, both the first three-way valve and the second three-way valve are connected to the second buffer device.

4. The feed gas flexible control device system according to any one of claims 1-3, characterized in that, The reaction synthesis unit includes a raw material mixing device, a carbon dioxide hydrogenation reaction device, and a heat exchange device connected in sequence. Preferably, a third valve is provided on the pipeline connecting the raw material mixing device and the carbon dioxide hydrogenation reactor; Preferably, the carbon dioxide hydrogenation reactor comprises any one or a combination of at least two of a fixed bed, a fluidized bed, or a trickle bed.

5. The feed gas flexible control device system according to any one of claims 1-4, characterized in that, The raw gas flexible control device system also includes a product separation unit; Preferably, the heat exchange device is connected to the product separation unit.

6. A method for flexibly controlling the feed gas in a carbon dioxide hydrogenation reaction, characterized in that, The method for flexible control of the raw gas is carried out using the raw gas flexible control device system according to any one of claims 1-5, specifically including: H2 supplied by the mixed hydrogen feed unit and CO2 supplied by the carbon dioxide feed unit are used in the reaction synthesis unit for carbon dioxide hydrogenation reaction. The biomass gasification flexible control unit regulates the volume ratio of CO and H2 in the syngas and the amount of gas delivered based on the change in H2 provided by the feed unit.

7. The method for flexible control of raw gas according to claim 6, characterized in that, The regulation of the volume ratio of CO and H2 in the synthesis gas and the amount of gas transported includes the following two cases: When the amount of H2 supplied by the feeding unit is sufficient for the carbon dioxide hydrogenation reaction, both the first three-way valve and the second three-way valve are connected to the second buffer device; or When the amount of H2 provided by the feed unit is insufficient for the carbon dioxide hydrogenation reaction, the gasification reaction parameters in the biomass gasification reactor are adjusted, and the first three-way valve and the second three-way valve are connected to the reaction synthesis unit. Preferably, the volume ratio of syngas CO to H2 in the biomass gasification flexible control unit is 1:(1-3).

8. The method for flexible control of raw gas according to claim 7, characterized in that, The gasification reaction parameters include biomass type, biomass dosage, gasification reaction temperature, gasification reaction pressure, and oxidant type.

9. The method for flexible control of feed gas according to any one of claims 6-8, characterized in that, The outlet pressures of the first, second, third, and fourth pressurizing pumps are all ≤5MPa; Preferably, the temperature of the carbon dioxide hydrogenation reaction is 300-450°C.

10. The method for flexible control of feed gas according to any one of claims 6-9, characterized in that, The products of the carbon dioxide hydrogenation reaction include any one of methanol, jet fuel, olefins, or aromatics.

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