A fixed bed non-slagging gasification syngas purification system

Abstract

This utility model relates to the field of coal gasification technology, specifically to a fixed-bed non-slag gasification syngas purification system. The system includes a methanol storage tank for providing lean methanol solution; a shift syngas absorption tower, with a carbon dioxide absorption section and a sulfur absorption section arranged sequentially from top to bottom; a lean methanol inlet and a purified gas outlet at the top of the tower; and a syngas inlet and a carbon- and sulfur-rich methanol outlet at the bottom. A collection tray is located at the bottom of the carbon dioxide absorption section. The sulfur absorption section removes sulfur from the syngas, and the carbon dioxide absorption section removes carbon dioxide from the desulfurized syngas. A methanol transfer pipeline transports a portion of the methanol washing liquid from the collection tray to a thermal regeneration device and a portion to the top of the sulfur absorption section. This purification system can effectively purify carbon dioxide and sulfur components in the shift syngas.

Description

Technical Field

[0001] This utility model relates to the field of coal gasification technology, specifically to a fixed-bed non-slag gasification syngas purification system. Background Technology

[0002] The acidic crude syngas produced by fixed-bed non-slag gasification in the coal gasification shift conversion section typically requires purification before being used in the subsequent natural gas synthesis section. This is mainly because the acidic crude syngas contains impurities such as CO2, H2S, and COS. If these are not removed, they will corrode the equipment in the subsequent natural gas synthesis section and cause catalyst poisoning. Currently, the purification of acidic crude syngas usually employs a low-temperature methanol washing method. However, current syngas purification systems based on this method not only suffer from poor desulfurization and decarbonization effects, but also, because this method typically uses carbon-rich methanol liquid after decarbonization directly for desulfurization, the bottom of the absorber is output as a large amount of carbon-sulfur-rich methanol liquid, increasing the difficulty of methanol liquid regeneration.

[0003] Therefore, there is an urgent need for a fixed-bed non-slag gasification syngas purification system to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the problems in existing syngas purification systems based on low-temperature methanol washing, which not only suffer from poor desulfurization and decarbonization effects, but also from the fact that this method typically uses carbon-rich methanol liquid after decarbonization for desulfurization, resulting in a large amount of carbon-rich sulfur methanol liquid being output from the bottom of the absorption tower, thus increasing the difficulty of methanol liquid regeneration. This invention provides a fixed-bed non-slag gasification syngas purification system.

[0005] To achieve the above objectives, this utility model provides a fixed-bed non-slag gasification syngas purification system, the fixed-bed non-slag gasification syngas purification system comprising:

[0006] Methanol storage tanks are used to supply lean methanol solution;

[0007] The syngas absorption tower has a carbon dioxide absorption section and a sulfur absorption section arranged sequentially from top to bottom inside the tower. The top of the tower has a lean methanol inlet and a purified gas outlet, and the bottom of the tower has a syngas inlet and a carbon-rich sulfur methanol outlet. The bottom of the carbon dioxide absorption section is equipped with a liquid collection tray. The sulfur absorption section is used to remove sulfur from the syngas, and the carbon dioxide absorption section is used to remove carbon dioxide from the syngas after desulfurization.

[0008] The methanol transfer pipeline is used to transport part of the methanol washing liquid in the collection pan to the thermal regeneration equipment and part to the top of the sulfur absorption section.

[0009] Preferably, the carbon dioxide absorption section includes:

[0010] Multiple carbon dioxide absorption section units are arranged in series, and each carbon dioxide absorption section unit is provided with a liquid collection tray at the bottom;

[0011] Multiple methanol cooling pipelines are used to cool the methanol washing liquid in the collection tray at the bottom of each current carbon dioxide absorption section unit and then transport it to the top of the adjacent next-level carbon dioxide absorption section unit.

[0012] The methanol transfer pipeline is used to transport part of the methanol washing liquid in the collection pan at the bottom of the final carbon dioxide absorption section unit to the thermal regeneration equipment, and part of it to the top of the sulfur absorption section.

[0013] Preferably, the methanol cooling pipeline is used to mix and cool the methanol washing liquid in the collection pan at the bottom of each current carbon dioxide absorption section unit with a portion of lean methanol liquid from the methanol storage tank, and then transport it to the top of the adjacent next-level carbon dioxide absorption section unit.

[0014] Preferably, the methanol cooling pipeline is used to first mix and cool the methanol washing liquid in the collection pan at the bottom of each current carbon dioxide absorption section unit with a portion of lean methanol liquid from the methanol storage tank, and then transport it to the top of the adjacent next-level carbon dioxide absorption section unit after secondary cooling by the cooler.

[0015] Preferably, the methanol cooling pipeline is used to cool the methanol washing liquid in the collection tray at the bottom of each current carbon dioxide absorption section unit and then transport it to the top of the adjacent next-level carbon dioxide absorption section unit.

[0016] Preferably, the cooler is an ammonia cooler.

[0017] Preferably, the methanol transfer pipeline is used to mix and cool a portion of the methanol washing liquid in the collection pan at the bottom of the final stage carbon dioxide absorption section unit with a portion of the methanol washing liquid transported to the top of the next stage carbon dioxide absorption section unit via any methanol cooling pipeline, and then transport the mixture to the top of the sulfur absorption section.

[0018] Preferably, it also includes a spray head for atomizing the methanol absorbent and then contacting it countercurrently with the synthesis gas.

[0019] Preferably, the methanol storage tank is connected to a lean methanol filter at its outlet.

[0020] Preferably, the thermal regeneration equipment is used to regenerate the methanol washing liquid and return the regenerated lean methanol liquid to the methanol storage tank for recycling.

[0021] The advantages of this invention compared to existing technologies are as follows: by changing the sulfur absorption section of the syngas absorption tower to remove sulfur from the syngas, and the carbon dioxide absorption section to remove carbon dioxide from the desulfurized syngas, and by using a methanol transfer pipeline to transport part of the methanol washing liquid in the collection pan to the thermal regeneration equipment and part to the top of the sulfur absorption section, in practical applications, it can not only effectively purify the carbon dioxide and sulfur components in the syngas, but also effectively reduce the amount of carbon-rich sulfur methanol liquid and increase the amount of carbon-rich methanol liquid, thereby effectively reducing the overall regeneration difficulty of the methanol liquid. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a fixed-bed non-slag gasification syngas purification system in one specific implementation.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Methanol storage tank; 2. Lean methanol filter; 3. Shift synthesis gas absorption tower; 4. Carbon dioxide absorption section unit one; 5. First collection tray; 6. Carbon dioxide absorption section unit two; 7. Second collection tray; 8. Sulfur absorption section; 9. Cooler; 10. First control valve; 11. Second control valve; 12. Third control valve; 13. Fourth control valve. Detailed Implementation

[0025] The following provides a detailed description of the specific embodiments of this utility model. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this utility model.

[0026] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of technical features indicated. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The term "comprising" and any variations thereof mean a non-exclusive inclusion, the possibility of the presence or addition of one or more other features, units, components, and / or combinations thereof.

[0027] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] This utility model provides a fixed-bed non-slag gasification syngas purification system, such as... Figure 1 As shown, the fixed-bed non-slag gasification syngas purification system includes:

[0029] Methanol storage tank 1 is used to provide lean methanol solution;

[0030] The syngas absorption tower 3 has a carbon dioxide absorption section and a sulfur absorption section 8 arranged sequentially from top to bottom inside the tower. The top of the tower has a lean methanol inlet and a purified gas outlet, and the bottom of the tower has a syngas inlet and a carbon-rich sulfur methanol outlet. The bottom of the carbon dioxide absorption section is equipped with a liquid collection tray. The sulfur absorption section 8 is used to remove sulfur from the syngas, and the carbon dioxide absorption section is used to remove carbon dioxide from the syngas after desulfurization.

[0031] The methanol transfer pipeline is used to transport part of the methanol washing liquid in the collection pan to the thermal regeneration equipment and part to the top of the sulfur absorption section 8.

[0032] According to the above technical solution, based on this fixed-bed non-slag gasification syngas purification system, the sulfur absorption section 8 of the syngas absorption tower 3 is used to remove sulfur from the syngas, and the carbon dioxide absorption section is used to remove carbon dioxide from the desulfurized syngas. A methanol transfer pipeline is used to transport a portion of the methanol washing liquid in the collection pan to the thermal regeneration equipment and a portion to the top of the sulfur absorption section. In practical applications, this system can not only effectively purify carbon dioxide and sulfur components in the syngas, but also effectively reduce the amount of carbon-rich sulfur methanol liquid and increase the amount of carbon-rich methanol liquid, thereby effectively reducing the overall regeneration difficulty of the methanol liquid. The consideration for reducing the amount of carbon-rich sulfur methanol liquid is that the absorption rate of sulfur by methanol is much greater than the absorption rate of carbon dioxide. In this case, the methanol liquid used to absorb carbon dioxide does not need to be used entirely for sulfur absorption.

[0033] In the fixed-bed non-slag gasification syngas purification system of this utility model, preferably, the carbon dioxide absorption section includes:

[0034] Multiple carbon dioxide absorption section units are arranged in series, and each carbon dioxide absorption section unit is provided with a liquid collection tray at the bottom;

[0035] Multiple methanol cooling pipelines are used to cool the methanol washing liquid in the collection tray at the bottom of each current carbon dioxide absorption section unit and then transport it to the top of the adjacent next-level carbon dioxide absorption section unit.

[0036] The methanol transfer pipeline is used to transport part of the methanol washing liquid in the collection pan at the bottom of the final carbon dioxide absorption section unit to the thermal regeneration equipment, and part of it to the top of the sulfur absorption section 8.

[0037] In this invention, by further comprising multiple carbon dioxide absorption section units arranged in series and multiple methanol cooling pipelines to cool the methanol washing liquid in the collection pan at the bottom of each current carbon dioxide absorption section unit and then transport it to the top of the adjacent next-level carbon dioxide absorption section unit, this effectively avoids the problem of excessively long single-stage carbon dioxide absorption sections, leading to a significant decrease in end-absorption efficiency due to the temperature rise of lean methanol after absorbing carbon dioxide from the syngas. The specific number and length of the carbon dioxide absorption sections are set according to actual needs, such as ensuring that the carbon dioxide absorption efficiency before and after each section does not significantly deteriorate due to temperature rise, and that the desulfurization effect meets the expected requirements.

[0038] Specifically, such as Figure 1 As shown, the carbon dioxide absorption section includes a carbon dioxide absorption section unit 4 and a carbon dioxide absorption section unit 6 arranged in series. A first collection tray 5 is provided at the bottom of carbon dioxide absorption section unit 4, and a second collection tray 7 is provided at the bottom of carbon dioxide absorption section unit 6. Since there are only two carbon dioxide absorption section units, there is only one methanol cooling pipeline; that is, the total number of methanol cooling pipelines is one less than the number of carbon dioxide absorption section units. The methanol cooling pipeline is used to cool the methanol washing liquid in the first collection tray 5 at the bottom of carbon dioxide absorption section unit 4 and then transport it to the top of the adjacent carbon dioxide absorption section unit 6. This effectively ensures that the temperature difference of the methanol liquid entering different carbon dioxide absorption section units is within the required range. Preferably, the temperature of the methanol liquid transported to the top of the adjacent lower-level carbon dioxide absorption section unit after cooling is equal to the temperature of the lean methanol liquid entering the top of the first-level carbon dioxide absorption section unit, thereby ensuring the consistency of the absorption effect of each carbon dioxide absorption section unit. Wherein, because... Figure 1 There are only two carbon dioxide absorption section units in the middle. Therefore, the first-stage carbon dioxide absorption section unit is carbon dioxide absorption section unit 1 (4), and the last-stage carbon dioxide absorption section unit is carbon dioxide absorption section unit 2 (6). However, if there are more than two carbon dioxide absorption section units, the first-stage carbon dioxide absorption section unit is still carbon dioxide absorption section unit 1 (4). The difference is that the last-stage carbon dioxide absorption section unit is always the carbon dioxide absorption section unit adjacent to sulfur absorption section 8.

[0039] In the fixed-bed non-slag gasification syngas purification system of this utility model, for the cooling of methanol washing liquid in the collection pan at the bottom of the non-final stage carbon dioxide absorption section unit, in a preferred embodiment, the methanol cooling pipeline is used to mix and cool the methanol washing liquid in the collection pan at the bottom of each current carbon dioxide absorption section unit with a portion of lean methanol liquid from the methanol storage tank 1, and then transport it to the top of the adjacent next-stage carbon dioxide absorption section unit. That is, the absorption effect of the carbon dioxide absorption section unit is ensured by directly introducing a portion of low-temperature lean methanol liquid for methanol washing liquid cooling.

[0040] More preferably, the methanol cooling pipeline is used to first mix and cool the methanol washing liquid in the collection pan at the bottom of each current carbon dioxide absorption section unit with a portion of lean methanol liquid from the methanol storage tank 1, and then, after secondary cooling by the cooler 9, transport it to the top of the adjacent lower-level carbon dioxide absorption section unit. This secondary cooling by the cooler 9 further effectively ensures the consistency of carbon dioxide absorption performance across all levels of the carbon dioxide absorption section units. Specifically, the cooler 9 is an ammonia cooler and has a built-in thermometer, thereby further reducing the temperature difference between the methanol washing liquid cooled and transported to the top of the lower-level carbon dioxide absorption section unit and the lean methanol liquid at the top of the first-level carbon dioxide absorption section unit, ensuring the consistency of carbon dioxide absorption performance across all levels of the carbon dioxide absorption section units.

[0041] In another preferred embodiment, the methanol cooling pipeline is used to cool the methanol washing liquid in the collection pan at the bottom of each current carbon dioxide absorption section unit and then transport it to the top of the adjacent next-level carbon dioxide absorption section unit. That is, the carbon dioxide absorption effect of each level of carbon dioxide absorption section unit can also be ensured by directly cooling it through the cooler 9.

[0042] In the fixed-bed non-slag gasification syngas purification system of this invention, because methanol absorbs sulfur from the syngas relatively quickly, and the temperature of the methanol washing liquid fed into the top of the carbon dioxide absorption section unit is controlled in a coordinated manner, a portion of the methanol washing liquid in the collection pan at the bottom of the final carbon dioxide absorption section unit can be directly transported to the top of the sulfur absorption section 8 for desulfurization. Of course, to further improve the desulfurization effect and rate, preferably, the methanol transfer pipeline is used to cool a portion of the methanol washing liquid in the collection pan at the bottom of the final carbon dioxide absorption section unit before transporting it to the top of the sulfur absorption section 8. The cooling method for this portion of the methanol washing liquid can refer to the cooling method used for the methanol washing liquid transported to the top of the adjacent lower-level carbon dioxide absorption section unit via the methanol cooling pipeline described above.

[0043] In one specific embodiment, the methanol transfer pipeline is used to mix and cool a portion of the methanol washing liquid in the collection pan at the bottom of the final carbon dioxide absorption section unit with a portion of the methanol washing liquid transported from the top of the next-stage carbon dioxide absorption section unit via any methanol cooling pipeline, and then transport the mixture to the top of the sulfur absorption section 8. More specifically, as... Figure 1 As shown, the methanol transfer pipeline is used to transport a portion of the methanol washing liquid in the collection pan at the bottom of the final carbon dioxide absorption section unit and a portion of the methanol washing liquid from a methanol cooling pipeline adjacent to the final carbon dioxide absorption section unit to the top of the next carbon dioxide absorption section unit. After mixing and cooling, the mixture is then transported to the top of the sulfur absorption section 8.

[0044] In the fixed-bed non-slag gasification syngas purification system described in this utility model, preferably, as follows: Figure 1 As shown, it also includes a spray head, which is used to atomize various methanol absorbent liquids and contact them countercurrently with the synthesis gas, thereby improving the absorption rate.

[0045] In the fixed-bed non-slag gasification syngas purification system of this utility model, preferably, the outlet end of the methanol storage tank 1 is connected to a lean methanol liquid filter 2, thereby avoiding impurities in the methanol liquid from causing blockage of the conversion syngas absorption tower 3.

[0046] In the fixed-bed non-slag gasification syngas purification system of this utility model, preferably, the thermal regeneration equipment is used to regenerate methanol washing liquid and return the regenerated lean methanol liquid to the methanol storage tank 1 for recycling, thereby reducing the amount of methanol purchased.

[0047] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto.

[0048] Example 1

[0049] Adopting such Figure 1 The fixed-bed non-slag gasification syngas purification system shown is implemented for the purification of crude syngas. Specifically, the fixed-bed non-slag gasification syngas purification system includes:

[0050] Methanol storage tank 1 is used to provide lean methanol solution;

[0051] The syngas absorption tower 3 has a carbon dioxide absorption section and a sulfur absorption section 8 arranged sequentially from top to bottom inside the tower. The top of the tower has a lean methanol inlet and a purified gas outlet, and the bottom of the tower has a syngas inlet and a carbon-rich sulfur methanol outlet. The bottom of the carbon dioxide absorption section is equipped with a liquid collection tray. The sulfur absorption section 8 is used to remove sulfur from the syngas, and the carbon dioxide absorption section is used to remove carbon dioxide from the syngas after desulfurization.

[0052] The methanol transfer pipeline is used to transport part of the methanol washing liquid in the collection pan to the thermal regeneration equipment and part to the top of the sulfur absorption section 8.

[0053] Specifically, it also includes a spray head for atomizing the methanol absorbent and then contacting it countercurrently with the synthesis gas; the outlet end of the methanol storage tank 1 is connected to a lean methanol filter 2; the thermal regeneration equipment is used to regenerate the methanol washing liquid and return the regenerated lean methanol liquid to the methanol storage tank 1 for recycling.

[0054] The carbon dioxide absorption section includes:

[0055] Carbon dioxide absorption section unit 1 4 and carbon dioxide absorption section unit 2 6 are connected in series. The bottom of carbon dioxide absorption section unit 1 4 is provided with a first liquid collection tray 5, and the bottom of carbon dioxide absorption section unit 2 6 is provided with a second liquid collection tray 7.

[0056] A methanol cooling pipeline is used to cool the methanol washing liquid in the first collection tray 5 at the bottom of the carbon dioxide absorption section unit 1 4 and then transport it to the top of the adjacent carbon dioxide absorption section unit 2 6.

[0057] The methanol transfer pipeline is used to transport part of the methanol washing liquid in the second collection pan 7 at the bottom of the carbon dioxide absorption section unit 2 6 to the thermal regeneration equipment, and part of it to the top of the sulfur absorption section 8.

[0058] The methanol cooling pipeline is used to cool the methanol washing liquid in the first collection tray 5 at the bottom of the carbon dioxide absorption section unit 4 and then transport it to the top of the adjacent carbon dioxide absorption section unit 6; the cooler 9 is an ammonia cooler.

[0059] In practical applications, the first control valve 10 and the fourth control valve 13 are opened, while the second control valve 11 and the third control valve 12 are closed. The lean methanol liquid in the methanol storage tank 1 is pumped to the top of the shift synthesis gas absorption tower 3 and flows downwards within the tower. The crude synthesis gas is transported to the bottom of the shift synthesis gas absorption tower 3 via a gas pipeline and flows upwards within the tower, thus countercurrently contacting the methanol liquid to absorb carbon dioxide and sulfur from the synthesis gas. Specifically, when the crude synthesis gas flows through the sulfur absorption section 8, the sulfur in the crude synthesis gas is absorbed. Then, when it flows sequentially through the carbon dioxide absorption section unit 2 6 and the carbon dioxide absorption section unit 1 4, the carbon dioxide in the crude synthesis gas is absorbed. Finally, the purified gas after desulfurization and decarbonization exits from the top of the tower. The gas is discharged downstream. During the carbon dioxide absorption section (unit 4), the lean methanol liquid's temperature rises as it flows downwards, absorbing carbon dioxide. Therefore, to ensure effective carbon dioxide absorption in unit 6, a methanol cooling pipeline and an ammonia cooler are installed to cool the heated methanol washing liquid. To avoid generating large amounts of carbon-rich sulfur methanol liquid, which would increase the difficulty of subsequent regeneration, only a portion of the carbon-rich methanol liquid (i.e., the methanol washing liquid in the second collection pan 7) is sent to the top of the sulfur absorption section (unit 8) via a methanol transfer pipeline. The majority is sent to the thermal regeneration equipment for regeneration and then returned to the methanol storage tank (unit 1) for recycling. The carbon-rich methanol liquid entering the sulfur absorption section (unit 8) absorbs sulfur, becomes carbon-rich sulfur methanol liquid, and is then discharged for regeneration. All liquid phase transport is done using pumps. Figure 1 Not all of them are shown in the image.

[0060] Testing has shown that the fixed-bed non-slag gasification syngas purification system described in this invention can not only quickly and effectively absorb sulfur and carbon dioxide from crude syngas to obtain purified gas that meets the requirements of subsequent natural gas synthesis processes, but also effectively reduce the amount of carbon-rich sulfur methanol liquid and increase the amount of carbon-rich methanol liquid, thereby effectively reducing the overall regeneration difficulty of methanol liquid.

[0061] Example 2

[0062] The implementation is similar to Example 1, except that the third control valve 12 is opened, and the methanol cooling pipeline is used to mix and cool the methanol washing liquid in the first collection pan 5 at the bottom of the carbon dioxide absorption section unit 1 4 with a portion of lean methanol liquid from the methanol storage tank 1, and then after secondary cooling by the cooler 9, it is transported to the top of the adjacent carbon dioxide absorption section unit 2 6.

[0063] Testing revealed that the fixed-bed non-molten slag gasification syngas purification system described in this invention, compared to the scheme in Example 1, can further ensure the cooling effect of the heated methanol washing liquid, thereby effectively ensuring the consistency of carbon absorption effect in each carbon dioxide absorption section unit, and thus effectively improving the carbon absorption rate and carbon absorption effect.

[0064] Example 3

[0065] Referring to Embodiment 2, the difference is that the second control valve 11 is opened, and the methanol transfer pipeline is used to mix and cool a portion of the methanol washing liquid in the second collection pan 7 at the bottom of the carbon dioxide absorption section unit 2 6 with a portion of the methanol washing liquid transported to the top of the carbon dioxide absorption section unit 2 6 via the methanol cooling pipeline, and then transport it to the top of the sulfur absorption section 8.

[0066] Testing revealed that the fixed-bed non-slag gasification syngas purification system described in this invention can further improve the absorption rate and absorption effect of sulfur compared to the scheme in Example 2.

[0067] The fixed-bed non-slag gasification syngas purification system provided by this utility model uses a sulfur absorption section of the syngas absorption tower to remove sulfur from the syngas, a carbon dioxide absorption section to remove carbon dioxide from the desulfurized syngas, and a methanol transfer pipeline to transport part of the methanol washing liquid in the collection pan to the thermal regeneration equipment and part to the top of the sulfur absorption section. In practical applications, it can not only effectively purify and change the carbon dioxide and sulfur components in the syngas, but also effectively reduce the amount of carbon-rich sulfur methanol liquid and increase the amount of carbon-rich methanol liquid, thereby effectively reducing the overall regeneration difficulty of the methanol liquid.

[0068] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed by this utility model and all fall within the protection scope of this utility model.

Claims

1. A fixed-bed non-slag gasification syngas purification system, characterized in that, The fixed-bed non-slag gasification syngas purification system includes: Methanol storage tank (1), used to provide lean methanol solution; The transformation syngas absorption tower (3) has a carbon dioxide absorption section and a sulfur absorption section (8) arranged sequentially from top to bottom inside the tower. The top of the tower is provided with a lean methanol liquid inlet and a purified gas outlet, and the bottom of the tower is provided with a syngas inlet and a carbon-rich sulfur methanol liquid outlet. The bottom of the carbon dioxide absorption section is provided with a liquid collection plate. The sulfur absorption section (8) is used to remove sulfur from the syngas, and the carbon dioxide absorption section is used to remove carbon dioxide from the syngas after desulfurization. The methanol transfer pipeline is used to transport part of the methanol washing liquid in the collection pan to the thermal regeneration equipment and part to the top of the sulfur absorption section (8).

2. The fixed-bed non-slag gasification syngas purification system according to claim 1, characterized in that, The carbon dioxide absorption section includes: Multiple carbon dioxide absorption section units are arranged in series, and each carbon dioxide absorption section unit is provided with a liquid collection tray at the bottom; Multiple methanol cooling pipelines are used to cool the methanol washing liquid in the collection tray at the bottom of each current carbon dioxide absorption section unit and then transport it to the top of the adjacent next-level carbon dioxide absorption section unit. The methanol transfer pipeline is used to transport part of the methanol washing liquid in the collection pan at the bottom of the final carbon dioxide absorption section unit to the thermal regeneration equipment, and part of it to the top of the sulfur absorption section (8).

3. The fixed-bed non-slag gasification syngas purification system according to claim 2, characterized in that, The methanol cooling pipeline is used to mix and cool the methanol washing liquid in the collection pan at the bottom of each current carbon dioxide absorption section unit with a portion of lean methanol liquid from the methanol storage tank (1) and then transport it to the top of the adjacent lower-level carbon dioxide absorption section unit.

4. The fixed-bed non-slag gasification syngas purification system according to claim 3, characterized in that, The methanol cooling pipeline is used to mix and cool the methanol washing liquid in the collection pan at the bottom of each current carbon dioxide absorption section unit with a portion of lean methanol liquid from the methanol storage tank (1), and then transport it to the top of the adjacent lower-level carbon dioxide absorption section unit after secondary cooling by the cooler (9).

5. The fixed-bed non-slag gasification syngas purification system according to claim 2, characterized in that, The methanol cooling pipeline is used to cool the methanol washing liquid in the collection pan at the bottom of each current carbon dioxide absorption section unit and then transport it to the top of the adjacent next-level carbon dioxide absorption section unit.

6. The fixed-bed non-slag gasification syngas purification system according to claim 4 or 5, characterized in that, The cooler (9) is an ammonia cooler.

7. The fixed-bed non-slag gasification syngas purification system according to claim 2, characterized in that, The methanol transfer pipeline is used to transport a portion of the methanol washing liquid in the collection pan at the bottom of the final stage carbon dioxide absorption section unit to any methanol cooling pipeline, and then to the top of the sulfur absorption section (8) after mixing, cooling and transporting the methanol washing liquid at the top of the next stage carbon dioxide absorption section unit.

8. The fixed-bed non-slag gasification syngas purification system according to any one of claims 1-5 and 7, characterized in that, It also includes spray nozzles, which are used to atomize the methanol absorbent and bring it into countercurrent contact with the synthesis gas.

9. The fixed-bed non-slag gasification syngas purification system according to claim 1, characterized in that, The methanol storage tank (1) is connected to a lean methanol filter (2) at its outlet.

10. The fixed-bed non-slag gasification syngas purification system according to claim 1, characterized in that, The thermal regeneration equipment is used to regenerate methanol washing liquid and return the regenerated lean methanol liquid to the methanol storage tank (1) for recycling.

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