Synthesis gas preparation system
By using a compression device to pressurize and reflux carbon dioxide in the synthesis gas preparation system, instead of steam as a gasifier, the problem of high steam consumption in traditional processes is solved, and the effect of reducing energy consumption and improving carbon source utilization is achieved.
Patent Information
- Application Number
- CN202420818481.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-04-18
AI Technical Summary
The traditional synthesis gas preparation process requires a large amount of steam to control the gasification reaction temperature, resulting in high steam consumption and thus increasing production energy consumption.
A synthesis gas preparation system was designed to pressurize carbon dioxide by a combination of a gasifier, a conversion furnace, a separation device and a compression device, and reflux it into the gasifier and a conversion furnace in place of steam as gas. Chemical agent.
By reducing steam consumption, production energy consumption is reduced, and the utilization rate of carbon sources is improved while reducing carbon dioxide emissions.
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Figure CN222476528U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical industry, in particular to a synthesis gas preparation system. Background Art
[0002] In processes such as coal-to-methanol and straw-to-methanol, carbon sources such as coal and straw need to be gasified into carbon monoxide and hydrogen in an oxygen and water vapor environment.
[0003] However, the traditional preparation process requires the addition of a large amount of steam to control the gasification reaction temperature, resulting in high steam consumption. Utility Model Content
[0004] The embodiment of the present application provides a synthesis gas preparation system, which is beneficial to reducing steam consumption and thus helping to reduce production energy consumption.
[0005] On the one hand, according to an embodiment of the present application, a synthesis gas preparation system is proposed, including: a gasifier, the gasifier is configured to convert the reactant into a first mixed gas; a converter, connected to the gasifier, the converter is configured to convert the first mixed gas obtained from the gasifier into a second mixed gas; a separation device, connected to the converter, the separation device is configured to separate the second mixed gas obtained from the converter into carbon dioxide and synthesis gas; a compression device, connected to the separation device and connected to at least one of the gasifier and the converter, the compression device is configured to pressurize the carbon dioxide obtained from the separation device, and the pressurized carbon dioxide can enter at least one of the gasifier and the converter from the compression device.
[0006] According to one aspect of an embodiment of the present application, the synthesis gas preparation system also includes a first regulating valve, which is arranged on a pipeline connecting the separation device and the compression device, and the first regulating valve is configured to regulate the flow of carbon dioxide entering the compression device.
[0007] According to one aspect of an embodiment of the present application, the pipeline includes a main pipeline, a first pipeline and a second pipeline. The first pipeline is connected between the main pipeline and the compression device, the second pipeline is connected to the first pipeline and communicates with the external environment, and the first regulating valve is arranged in the second pipeline.
[0008] According to one aspect of an embodiment of the present application, the compression device is connected to the gasifier and the reformer respectively, and the pressurized carbon dioxide can enter the gasifier and the reformer from the compression device.
[0009] According to one aspect of an embodiment of the present application, the synthesis gas preparation system also includes a second regulating valve and a third regulating valve, the second regulating valve is arranged between the compression device and the converter, and the second regulating valve is configured to adjust the flow rate of carbon dioxide entering the converter, and the third regulating valve is arranged between the compression device and the gasifier, and the third regulating valve is configured to adjust the flow rate of carbon dioxide entering the gasifier.
[0010] According to one aspect of an embodiment of the present application, the compression device includes an n-stage compressor, a heat exchanger is connected between two adjacent stages of the compressors, and carbon dioxide can be pressurized by the first stage compressor through each stage of the compressor in sequence and discharged by the n-th stage compressor, n≥2.
[0011] According to one aspect of an embodiment of the present application, the converter is a partial oxidation converter, which has a accommodating chamber and a first air inlet, a second air inlet and a first air outlet connected to the accommodating chamber. In the height direction of the partial oxidation converter, the height dimensions of the first air inlet and the second air inlet are greater than the height dimension of the first air outlet. The first mixed gas enters the accommodating chamber through the first air inlet, the second mixed gas is discharged from the first air outlet and enters the separation device, and carbon dioxide enters the accommodating chamber through the second air inlet.
[0012] According to one aspect of an embodiment of the present application, the separation device has a third air inlet, a second air outlet and a third air outlet, the second mixed gas enters the separation device through the third air inlet, carbon dioxide is discharged from the second air outlet, and synthesis gas is discharged from the third air outlet.
[0013] According to one aspect of an embodiment of the present application, the synthesis gas preparation system further includes a synthesis device, which is connected to the separation device, and the synthesis device is configured to convert the synthesis gas obtained from the separation device into methanol.
[0014] According to one aspect of an embodiment of the present application, the synthesis gas preparation system further includes a supply device, which is connected to the synthesis device and is configured to accommodate hydrogen.
[0015] The synthesis gas preparation system provided in the embodiment of the present application includes a gasifier, a converter, a separation device and a compression device. By setting the compression device, the compression device is connected to the separation device and is connected to at least one of the gasifier and the converter, so that the carbon dioxide separated by the separation device can enter the compression device for pressurization, and the pressurized carbon dioxide can enter at least one of the gasifier and the converter to replace steam as a gasifying agent, which is beneficial to reducing steam consumption and thus helping to reduce production energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.
[0017] Figure 1 A connection diagram of a synthesis gas preparation system according to an embodiment of the present application;
[0018] Figure 2 A connection diagram of a synthesis gas preparation system according to another embodiment of the present application;
[0019] Figure 3 This is a connection diagram of a synthesis gas preparation system according to another embodiment of the present application.
[0020] in:
[0021] 11-gasification furnace; 12-conversion furnace; 13-separation device; 14-compression device;
[0022] 151 - first regulating valve; 152 - second regulating valve; 153 - third regulating valve;
[0023] 16- pipeline; 161- main pipeline; 162- first pipeline; 163- second pipeline;
[0024] 17-Synthesis device; 18-Supply device. DETAILED DESCRIPTION
[0025] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.
[0026] The directional words appearing in the following description are all directions shown in the figure, and do not limit the synthesis gas preparation system of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0027] In the process of gasifying coal or biomass (corn stalks, rice stalks, sorghum stalks, reed stalks, sawdust, branches or bark or miscellaneous wood, cattle and sheep manure, etc.) to produce synthesis gas (mainly carbon monoxide and hydrogen), oxygen-enriched or pure oxygen and water vapor are used as gasification agents, and the gasification products are carbon monoxide and hydrogen, and a large amount of carbon dioxide gas will inevitably be produced. Among them, adding steam in the biomass gasification process can be used to control the gasification reaction temperature, so there will be a problem of excessive steam consumption, which will lead to high production energy consumption.
[0028] In view of the above defects, an embodiment of the present application provides a synthesis gas preparation system, which can use carbon dioxide produced by biomass gasification as a gasification agent instead of steam to reduce steam consumption and thus reduce production energy consumption.
[0029] In order to better understand this application, Figure 1 and Figure 3 The synthesis gas preparation system according to the embodiment of the application is described in detail.
[0030] See also Figure 1 , an embodiment of the present application provides a synthesis gas preparation system, including a gasifier 11, a reformer 12, a separation device 13 and a compression device 14. The gasifier 11 is configured to convert the reactant into a first mixed gas. The reformer 12 is connected to the gasifier 11, and the reformer 12 is configured to convert the first mixed gas obtained from the gasifier 11 into a second mixed gas. The separation device 13 is connected to the reformer 12, and the separation device 13 is configured to separate the second mixed gas obtained from the reformer 12 into carbon dioxide and synthesis gas. The compression device 14 is connected to the separation device 13 and is connected to at least one of the gasifier 11 and the reformer 12. The compression device 14 is configured to pressurize the carbon dioxide obtained by the separation device 13, and the pressurized carbon dioxide can enter at least one of the gasifier 11 and the reformer 12 from the compression device 14.
[0031] The gasifier 11 may include a furnace body, which has a cavity and a feed port, an air inlet and an exhaust port connected to the cavity. The filling port is used to place reactants such as coal and straw into the cavity. Oxygen and steam can enter the cavity through the air inlet to react with the reactants, so that the reactants are gasified and converted into a first mixed gas. The exhaust port can be used to discharge the first mixed gas produced by gasifying the reactants through the exhaust port.
[0032] The reactants may include coal or biomass, wherein the biomass is corn stalks, rice stalks, sorghum stalks, reed stalks, sawdust, branches or bark or miscellaneous wood, cattle and sheep manure, etc.; the first mixed gas is raw coal gas containing tar and methane.
[0033] The gasifier 11 may have one air inlet, that is, oxygen and steam can enter the cavity through the same air inlet to react with the reactants. In addition, pressurized carbon dioxide can also enter the cavity through this air inlet to replace steam as a gasifying agent.
[0034] The gasifier 11 may also have two or more air inlets, and oxygen and steam may each enter the cavity through different air inlets to react with the reactants. In addition, pressurized carbon dioxide may also enter the cavity through an air inlet different from that of oxygen and steam to replace steam as a gasifying agent. Of course, pressurized carbon dioxide may also share an air inlet with oxygen or steam.
[0035] The reformer 12 is connected to the exhaust port of the gasifier 11. The first mixed gas generated by the gasifier 11 enters the reformer 12 through the exhaust port and is converted into a second mixed gas in the reformer 12. The second mixed gas is a crude mixed gas containing components such as carbon monoxide, hydrogen, and carbon dioxide. Oxygen and steam can be introduced into the reformer 12 to react with the first mixed gas to convert it into the second mixed gas.
[0036] The separation device 13 is in communication with the reformer 12 . The second mixed gas generated by the reformer 12 can enter the separation device 13 and be separated into carbon dioxide and synthesis gas in the separation device 13 . The synthesis gas is a mixed gas of hydrogen and carbon monoxide.
[0037] The synthesis gas produced by the synthesis gas production system provided in the embodiment of the present application can be converted into chemical products such as urea and ammonia through catalytic reactions, and can also be converted into hydrocarbons, and further developed into the production of gasoline, diesel and other products. Moreover, the synthesis gas can also be used as a fuel gas, for example, as a component for chemical energy storage and conversion in fuel cells. In addition, the synthesis gas can be used to produce important raw materials such as plasticizers.
[0038] The compression device 14 is in communication with the separation device 13 , and the carbon dioxide separated by the separation device 13 can enter the compression device 14 and be pressurized by the compression device 14 to form a gasifying agent that can enter the gasifier 11 and / or the reformer 12 to replace steam.
[0039] Optionally, the compression device 14 may be connected only to the converter 12, which can reduce the steam consumption used by the converter 12. The compression device 14 may also be connected only to the gasifier 11, which can reduce the steam consumption used by the gasifier 11. The compression device 14 can also be connected to the converter 12 and the gasifier 11 respectively, which is beneficial to reduce the overall steam consumption used by the synthesis gas preparation system. The specific setting can be made according to actual needs.
[0040] The synthesis gas preparation system provided in the embodiment of the present application includes a gasifier 11, a converter 12, a separation device 13 and a compression device 14. By setting the compression device 14, the compression device 14 is connected to the separation device 13 and is connected to at least one of the gasifier 11 and the converter 12, so that the carbon dioxide separated by the separation device 13 can enter the compression device 14 for pressurization, and the pressurized carbon dioxide can enter at least one of the gasifier 11 and the converter 12 to replace steam as a gasifying agent, which is beneficial to reducing steam consumption and thus helping to reduce production energy consumption.
[0041] It is understandable that in addition to carbon monoxide, hydrogen and carbon dioxide, the second mixed gas also contains hydrogen sulfide, coal ash, etc. The second mixed gas can be separated into carbon dioxide and synthesis gas including carbon monoxide and hydrogen in the separation device 13. The carbon dioxide and the synthesis gas can be discharged into the downstream device together to be prepared into the required product. Of course, the carbon dioxide can also be discharged to the external environment for release. Under this set environment, the synthesis gas preparation system provided in the embodiment of the present application can recycle carbon dioxide and circulate it to at least one of the gasifier 11 and the converter 12 to replace steam as a gasification agent, which can reduce the emission of carbon dioxide discharged into the external environment, which is beneficial to reducing air pollution. In addition, the partial or complete replacement of steam by carbon dioxide can also increase the content of carbon monoxide in the synthesis gas, which is beneficial to improving the utilization rate of the carbon source.
[0042] The separation device 13 may contain methanol solvent, and utilize a low-temperature methanol washing process to purify the second mixed gas and separate carbon dioxide and synthesis gas. The separation device 13 may also utilize a dry desulfurization process combined with a PSA adsorption decarbonation process. The carbon dioxide is first purified into a mixed gas including carbon monoxide, hydrogen, and carbon dioxide through a dry desulfurization process, and then the carbon dioxide is separated through a PSA adsorption decarbonation process.
[0043] Depend on Figure 2 As shown, in some optional embodiments, the synthesis gas preparation system provided by one embodiment of the present application further includes a first regulating valve 151, which is arranged on the pipeline 16 connecting the separation device 13 and the compression device 14, and the first regulating valve 151 is configured to adjust the flow of carbon dioxide entering the compression device 14.
[0044] Optionally, the first regulating valve 151 may include a high-pressure regulating valve, an electric regulating valve, a stop valve, etc., which is not limited in the present application, and it only needs to be able to regulate the flow of carbon dioxide entering the compression device 14.
[0045] The flow rate of carbon dioxide entering the compression device 14 can also be expressed as the circulation amount of carbon dioxide in the synthesis gas preparation system, that is, the amount of carbon dioxide in the second mixed gas that is not discharged to the external environment but is recycled to replace steam as a gasification agent.
[0046] Specifically, the circulation amount of carbon dioxide may be controlled by a carbon dioxide circulation ratio, and the carbon dioxide circulation ratio may be expressed as a ratio of the circulation amount of carbon dioxide to the amount of carbon dioxide in the second mixed gas.
[0047] For example, the basic composition of the reactants entering the gasifier 11 includes 29.57wt% carbon, 3.92wt% hydrogen, 1.22wt% nitrogen, 0.13wt% sulfur, 27.53wt% oxygen, 7.63wt% ash, and 30.00wt% water, where wt% is mass (weight) percentage. The received basic lower heating value of the reactants is 10.45MJ / kg, and the reactants enter the gasifier 11 at a rate of 82.6 tons per hour. Based on this, the following table data can be obtained:
[0048]
[0049] It can be seen from the above table that if the carbon dioxide is discharged directly, 44 tons of steam will need to be added per hour.
[0050] By using the synthesis gas preparation system provided in the embodiment of the present application, the following table data can be obtained:
[0051]
[0052] It can be seen from the above table that the synthesis gas preparation system provided in the embodiment of the present application, when the circulation amount of carbon dioxide entering the compression device 14 is 522.95 kmol / h, 14 tons of steam can be saved per hour, and the emission of carbon dioxide can be reduced by 12.2%; when the circulation amount of carbon dioxide is 1031.85 kmol / h, 31 tons of steam can be saved per hour, and the emission of carbon dioxide can be reduced by 25.7%; when the circulation amount of carbon dioxide is 1483.46 kmol / h, additional steam is no longer needed, and the emission of carbon dioxide can be reduced by 37.3%.
[0053] That is, the circulation ratio of carbon dioxide can be set to obtain the circulation amount of carbon dioxide, that is, the flow rate of carbon dioxide entering the compression device 14, and the first regulating valve can be set accordingly.
[0054] Increasing the carbon dioxide circulation ratio can help reduce carbon dioxide emissions and steam consumption, and because of the recycling of carbon dioxide, more carbon monoxide can be obtained, which is conducive to improving the utilization rate of carbon sources and thus improving production efficiency. Of course, the above is only an example, and the circulation amount of carbon dioxide can be set according to actual needs.
[0055] As an optional implementation, the pipeline 16 includes a main pipeline 161, a first pipeline 162 and a second pipeline 163. The first pipeline 162 is connected between the main pipeline 161 and the compression device 14, the second pipeline 163 is connected to the first pipeline 162 and communicates with the external environment, and the first regulating valve 151 is arranged in the second pipeline 163.
[0056] Part of the carbon dioxide separated by the separation device 13 can enter the compression device 14 via the main pipeline 161 and the first pipeline 162 in sequence, and part of it can be discharged into the atmosphere via the main pipeline 161 and the second pipeline 163 in sequence. Since the pressure difference between the carbon dioxide in the separation device 13 and the external environment atmosphere is large, the carbon dioxide will flow in the direction of connecting to the external environment. Therefore, the first regulating valve 151 is set on the second pipeline 163 connected to the external environment. By controlling the discharge amount of carbon dioxide discharged from the external environment, the circulation amount of carbon dioxide entering the compression device 14 can be controlled.
[0057] Optionally, the pipeline 16 can be configured as a plastic steel pipeline 16 .
[0058] As an optional implementation, the compression device 14 is connected to the gasifier 11 and the reformer 12 respectively, and the pressurized carbon dioxide can enter the gasifier 11 and the reformer 12 from the compression device 14 .
[0059] In the synthesis gas preparation system provided in the embodiment of the present application, the compression device 14 is connected to the gasifier 11 and the converter 12, so that the carbon dioxide pressurized by the compression device 14 can enter the gasifier 11 to replace steam as a gasifying agent, and can also enter the converter 12 to replace steam as a gasifying agent, which is beneficial to better reduce the consumption of steam, further reduce production energy consumption, and improve economy.
[0060] As an optional embodiment, the synthesis gas preparation system also includes a second regulating valve 152 and a third regulating valve 153. The second regulating valve 152 is arranged between the compression device 14 and the converter 12, and the second regulating valve 152 is configured to regulate the flow of carbon dioxide entering the converter 12. The third regulating valve 153 is arranged between the compression device 14 and the gasifier 11, and the third regulating valve 153 is configured to regulate the flow of carbon dioxide entering the gasifier 11.
[0061] Optionally, the second regulating valve 152 may include a high-pressure regulating valve, an electric regulating valve, a stop valve, etc., and the third regulating valve 153 may include a high-pressure regulating valve, an electric regulating valve, a stop valve, etc. The present application does not limit this, and it only needs to be able to adjust the flow of carbon dioxide entering the converter 12 and the gasifier 11.
[0062] The synthesis gas preparation system provided in the embodiment of the present application is beneficial to improving the reliability of the synthesis gas preparation system by setting the second regulating valve 152 and the third regulating valve 153, and preventing the circulation amount of carbon dioxide entering the gasifier 11 or the converter 12 from being too much or too little, thereby reducing production efficiency and even causing safety problems. In addition, since the circulation amount of carbon dioxide required in the gasifier 11 and the converter 12 is different, the above-mentioned setting can improve the flexibility of the synthesis gas preparation system and ensure the accuracy of the amount of carbon dioxide entering the gasifier 11 and the converter 12.
[0063] In some optional embodiments, the compression device 14 includes n-stage compressors, and a heat exchanger is connected between two adjacent stages of compressors. Carbon dioxide can be pressurized by the first stage compressor through each stage of compressors in sequence and discharged by the nth stage compressor, where n≥2.
[0064] By setting an n-stage compressor, the carbon dioxide discharged from the separation device 13 can be pressurized in sequence by the multi-stage compressor. The n-stage compressor disperses the compression process into multiple levels, and the pressure of each level is relatively small, which is conducive to improving efficiency and ensuring the safety performance of each stage of the compressor. In addition, since the compression ratio of each stage of the compressor is relatively small, the n-stage compressor has a lower load than the single-stage compressor, which is conducive to reducing machine wear, extending service life, and reducing operating costs, thereby helping to reduce energy consumption.
[0065] In addition, by installing a heat exchanger between compressor stages, the multi-stage compressor can further reduce the temperature and improve the compressor volume utilization, thereby saving power consumption.
[0066] As an optional embodiment, the converter 12 is a partial oxidation converter, which has a accommodating chamber and a first air inlet, a second air inlet and a first air outlet connected to the accommodating chamber. In the height direction of the partial oxidation converter, the height dimensions of the first air inlet and the second air inlet are greater than the height dimension of the first air outlet. The first mixed gas enters the accommodating chamber through the first air inlet, the second mixed gas is discharged from the first air outlet and enters the separation device 13, and carbon dioxide enters the accommodating chamber through the second air inlet.
[0067] In the synthesis gas preparation system provided in the embodiment of the present application, the reformer 12 may adopt a partial oxidation reformer to ensure the effectiveness of converting the first mixed gas into the second mixed gas.
[0068] Oxygen and steam may also enter the containing chamber through the second air inlet. When the carbon dioxide entering the containing chamber is sufficient to completely replace the steam, steam is no longer provided to the containing chamber.
[0069] By arranging the first air inlet and the second air inlet above the first air outlet, the first mixed gas, steam and / or recycled carbon dioxide and oxygen enter the containing chamber from the top and flow downward to react and be converted into the second mixed gas, and the second mixed gas flows out from the first air outlet, thereby facilitating improving the production efficiency of the converter 12.
[0070] As an optional embodiment, the separation device 13 has a third air inlet, a second air outlet and a third air outlet, the second mixed gas enters the separation device 13 from the third air inlet, carbon dioxide is discharged from the second air outlet, and synthesis gas is discharged from the third air outlet.
[0071] The second mixed gas can be discharged from the first gas outlet of the converter 12 and enter the separation device 13 through the third gas inlet. The second mixed gas is converted into carbon dioxide and synthesis gas in the separation device 13. At least part of the carbon dioxide can be discharged through the second gas outlet and enter the compression device 14. Some of the carbon dioxide can also be discharged to the external environment through the second gas outlet.
[0072] By configuring in the above manner, it is convenient to discharge the carbon dioxide and synthesis gas in the separation device 13 separately for use by downstream devices, which is beneficial to improving the efficiency of the synthesis gas preparation system.
[0073] See also Figure 3 As an optional embodiment, the synthesis gas preparation system further includes a synthesis device 17, which is connected to the separation device 13, and the synthesis device 17 is configured to convert the synthesis gas obtained by the separation device 13 into methanol.
[0074] The synthesis gas preparation system provided in the embodiment of the present application is configured with a synthesis device 17 downstream of the separation device 13. The synthesis gas separated by the separation device 13 can enter the synthesis device 17 and be used to produce methanol.
[0075] As an optional embodiment, the synthesis gas preparation system further includes a supply device 18, which is connected to the synthesis device 17 and is configured to accommodate hydrogen.
[0076] The synthesis gas preparation system provided in the embodiment of the present application recycles carbon dioxide and uses it as a gasifying agent instead of steam to reduce steam consumption. When the prepared synthesis gas is used to produce methanol, the ratio of hydrogen to carbon monoxide in the synthesis gas may decrease. Therefore, by providing a supply device 18 to supplement hydrogen into the synthesis device 17, it is beneficial to increase the hydrogen content in the synthesis gas, thereby helping to improve the production efficiency of methanol.
[0077] Optionally, hydrogen can be set to green hydrogen. Green hydrogen can be understood as a type of hydrogen produced by electrolyzing water using renewable energy (such as wind power, hydropower, solar energy, etc.), which can achieve zero carbon emissions during the production process.
[0078] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A synthesis gas preparation system, characterized in that: include: a gasifier (11), wherein the gasifier (11) is configured to convert the reactants into a first mixed gas; a reformer (12), which is connected to the gasifier (11), and the reformer (12) is configured to convert the first mixed gas obtained from the gasifier (11) into a second mixed gas; a separation device (13), which is connected to the reformer (12), and is configured to separate the second mixed gas obtained from the reformer (12) into carbon dioxide and synthesis gas; A compression device (14) is connected to the separation device (13) and is connected to at least one of the gasification furnace (11) and the conversion furnace (12). The compression device (14) is configured to pressurize the carbon dioxide obtained by the separation device (13), and the pressurized carbon dioxide can enter at least one of the gasification furnace (11) and the conversion furnace (12) through the compression device (14).
2. The synthesis gas preparation system according to claim 1, characterized in that: The synthesis gas preparation system also includes a first regulating valve (151), which is arranged on a pipeline (16) connecting the separation device (13) and the compression device (14), and the first regulating valve (151) is configured to regulate the flow of the carbon dioxide entering the compression device (14).
3. The synthesis gas preparation system according to claim 2, characterized in that: The pipeline (16) comprises a main pipeline (161), a first pipeline (162) and a second pipeline (163); the first pipeline (162) is connected between the main pipeline (161) and the compression device (14); the second pipeline (163) is connected to the first pipeline (162) and communicates with the external environment; the first regulating valve (151) is arranged on the second pipeline (163).
4. The synthesis gas preparation system according to claim 1, characterized in that: The compression device (14) is respectively connected to the gasification furnace (11) and the reforming furnace (12), and the pressurized carbon dioxide can enter the gasification furnace (11) and the reforming furnace (12) through the compression device (14).
5. The synthesis gas preparation system according to claim 4, characterized in that: The synthesis gas preparation system also includes a second regulating valve (152) and a third regulating valve (153), wherein the second regulating valve (152) is arranged between the compression device (14) and the reformer (12), and the second regulating valve (152) is configured to regulate the flow rate of the carbon dioxide entering the reformer (12), and the third regulating valve (153) is arranged between the compression device (14) and the gasifier (11), and the third regulating valve (153) is configured to regulate the flow rate of the carbon dioxide entering the gasifier (11).
6. The synthesis gas preparation system according to claim 1, characterized in that: The compression device includes n-stage compressors, and a heat exchanger is connected between two adjacent stages of the compressors. The carbon dioxide can be pressurized by the first stage compressor through each stage of the compressors in sequence and discharged by the nth stage compressor, where n≥2.
7. The synthesis gas preparation system according to any one of claims 1 to 6, characterized in that: The converter (12) is a partial oxidation converter, which comprises a containing chamber and a first air inlet, a second air inlet and a first air outlet connected to the containing chamber. In the height direction of the partial oxidation converter, the height dimensions of the first air inlet and the second air inlet are greater than the height dimension of the first air outlet. The first mixed gas enters the containing chamber through the first air inlet, the second mixed gas is discharged through the first air outlet and enters the separation device (13), and the carbon dioxide enters the containing chamber through the second air inlet.
8. The synthesis gas preparation system according to any one of claims 1 to 6, characterized in that: The separation device (13) has a third air inlet, a second air outlet and a third air outlet, the second mixed gas enters the separation device (13) through the third air inlet, the carbon dioxide is discharged through the second air outlet, and the synthesis gas is discharged through the third air outlet.
9. The synthesis gas preparation system according to any one of claims 1 to 6, characterized in that: The synthesis gas preparation system further comprises a synthesis device (17), wherein the synthesis device (17) is connected to the separation device (13), and the synthesis device (17) is configured to convert the synthesis gas obtained from the separation device (13) into methanol.
10. The synthesis gas preparation system according to claim 9, characterized in that: The synthesis gas preparation system further comprises a supply device (18), wherein the supply device (18) is connected to the synthesis device (17), and the supply device (18) is configured to contain hydrogen.