Carbon dioxide double-column rectification purification equipment

Abstract

This utility model discloses a dual-tower carbon dioxide distillation and purification device, comprising: a distillation column, a condenser-reflux assembly, and a gas-phase purification assembly. Multiple uniformly distributed distillation packing layers are fixedly installed inside the distillation column. An exhaust pipe is fixedly connected to the top of the distillation column, and a liquid-phase reflux pipe is fixedly connected to one side of the distillation packing layers. The condenser-reflux assembly is fixedly installed on one side of the distillation column and includes a top heat exchanger. The side of the top heat exchanger opposite to the distillation column is connected to a separation tank. Separation packing is fixedly installed inside the separation tank, and a return pipe is fixedly connected between the separation tank and the liquid-phase reflux pipe. The gas-phase purification assembly is located on one side of the separation tank. This utility model discloses a dual-tower carbon dioxide distillation and purification device that, by setting up a gas-phase heat exchange assembly, can simultaneously perform distillation and purification of liquid-phase carbon dioxide and gas-phase carbon dioxide, improving the product diversity of the carbon dioxide distillation column and expanding its application range.

Description

Technical Field

[0001] This utility model belongs to the technical field of carbon dioxide distillation and purification equipment, specifically relating to a carbon dioxide double-tower distillation and purification equipment. Background Technology

[0002] A carbon dioxide distillation column is a device used to separate and purify carbon dioxide. It is widely used in the carbon dioxide purification process. In carbon capture and recovery projects, carbon dioxide distillation columns are often used to purify carbon dioxide in various industrial tail gases. The working principle of a carbon dioxide distillation column is to use the gas-liquid phase change characteristics of carbon dioxide at different temperatures to separate carbon dioxide from the mixed gas through the distillation process.

[0003] Common carbon dioxide distillation columns mainly consist of a column body, trays, condenser, reflux tank, and other auxiliary components. Their working principle involves controlling the temperature inside the column, causing liquid carbon dioxide to condense at the bottom, while other gases are discharged from the top. When the mixed gas enters the column, it comes into contact with the liquid carbon dioxide as it passes through the packing layer. The packing layer creates a large contact area between the gas and liquid carbon dioxide, allowing them to mix thoroughly and reach a dynamic equilibrium, thus achieving carbon dioxide separation.

[0004] Most existing carbon dioxide distillation purification towers typically produce liquid carbon dioxide, resulting in a limited range of processed products. They cannot simultaneously process both gaseous and liquid carbon dioxide, leading to poor processing diversity in carbon dioxide distillation purification towers.

[0005] Therefore, in order to address the aforementioned technical problems, it is necessary to provide a carbon dioxide dual-tower distillation and purification device.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0007] The purpose of this invention is to provide a carbon dioxide dual-tower distillation and purification device that can simultaneously process gaseous carbon dioxide and liquid carbon dioxide.

[0008] To achieve the above objectives, a specific embodiment of this utility model provides a carbon dioxide dual-tower distillation and purification device, comprising: a distillation tower, a condensation reflux assembly, and a gas phase purification assembly.

[0009] The distillation column is fixedly equipped with multiple uniformly distributed distillation packing layers. An exhaust pipe is fixedly connected to the top of the distillation column. A liquid reflux pipe is fixedly connected to one side of the distillation packing layer. The liquid reflux pipe is arranged between the exhaust pipe and the distillation packing layer.

[0010] The condensation reflux assembly is fixedly installed on one side of the distillation column. The condensation reflux assembly includes a top heat exchanger, which is connected to an exhaust pipe. A separation tank is connected to the side of the top heat exchanger away from the distillation column. Separation packing is fixedly installed inside the separation tank. A return liquid pipe is fixedly connected between the separation tank and the liquid reflux pipe.

[0011] The gas phase purification component is arranged on one side of the separation tank. The gas phase purification component includes a gas phase heat exchange tower. The gas phase heat exchange tower is arranged on the side of the separation tank away from the heat exchanger at the top of the tower. A guide pipe is fixedly connected between the gas phase heat exchange tower and the separation tank. Multiple sets of heat exchange coils are fixedly installed inside the guide pipe.

[0012] In one or more embodiments of this utility model, a feed pipe is fixedly connected to one side of the distillation column, and the feed pipe is arranged below multiple sets of distillation packing layers. The carbon dioxide feedstock to be processed is fed into the distillation column through the feed pipe. A liquid phase outlet pipe is fixedly connected to the side of the distillation column opposite to the feed pipe. The liquid carbon dioxide at the bottom of the distillation column is discharged through the liquid phase outlet pipe.

[0013] In one or more embodiments of this utility model, a heat exchange tube is fixedly installed inside the top heat exchanger. The gas transported through the connecting pipe is condensed by a low-temperature fluid flowing through the heat exchange tube. A connecting pipe connects the top heat exchanger and the exhaust pipe, facilitating the flow and transport of gas within the distillation column.

[0014] In one or more embodiments of this utility model, a liquid delivery pipe connects the top heat exchanger and the separation tank, and the liquid delivery pipe is arranged below the connecting pipe and the separation packing. The liquid delivery pipe serves to connect the top heat exchanger and the separation tank, facilitating the delivery of condensed liquid carbon dioxide from the top heat exchanger to the separation tank.

[0015] In one or more embodiments of this utility model, a discharge pipe is fixedly connected to the side of the gas phase heat exchange tower away from the guide pipe, and the discharge pipe is arranged at the bottom of the gas phase heat exchange tower. The material inside the gas phase heat exchange tower is discharged through the discharge pipe.

[0016] In one or more embodiments of this utility model, a gas guide pipe is fixedly connected to the top of the gas phase heat exchange tower. The gas inside the gas phase heat exchange tower is conveyed and transported through the gas guide pipe. A condensation connecting pipe is fixedly connected to one end of the gas guide pipe located outside the gas phase heat exchange tower. The condensation connecting pipe connects the gas guide pipe to the condenser at the top of the tower, facilitating the transport of the gas inside the gas phase heat exchange tower along the gas guide pipe and the condensation connecting pipe to the condenser at the top of the tower for condensation.

[0017] In one or more embodiments of this utility model, a tower top condenser is fixedly connected to the end of the condensing connecting pipe away from the gas guide pipe, and a condensing tube is fixedly assembled inside the tower top condenser. The gas transported by the condensing connecting pipe is condensed and heat exchanged by guiding the low-temperature fluid through the condensing tube.

[0018] In one or more embodiments of this utility model, a second separation tank is provided on the side of the top condenser away from the condensation connecting pipe. The second separation tank performs gas-liquid separation on the top condenser. A condensation connecting pipe is fixedly connected between the second separation tank and the top condenser. The condensation connecting pipe connects the top condenser and the second separation tank, allowing the gas and liquid in the top condenser to be transported to the second separation tank along the condensation connecting pipe.

[0019] In one or more embodiments of this utility model, a second separation packing is fixedly assembled inside the second separation tank. Gas-liquid separation is performed in the second separation tank by the second separation packing. A vent pipe is fixedly connected to the top of the second separation tank. The vent pipe is used to exhaust gas from the second separation tank. A liquid guide pipe is fixedly connected to the bottom of the second separation tank. Liquid is discharged from the second separation tank through the liquid guide pipe.

[0020] In one or more embodiments of this utility model, a liquid guiding pipe is connected to the liquid guiding pipe and the gas phase heat exchange tower. The liquid guiding pipe serves to connect the liquid guiding pipe and the gas phase heat exchange tower, facilitating the return of liquid carbon dioxide from the second separation tank to the gas phase heat exchange tower.

[0021] Compared with the prior art, the carbon dioxide dual-tower distillation and purification equipment disclosed in this utility model can simultaneously perform distillation and purification of liquid carbon dioxide and gaseous carbon dioxide by setting up a gas phase heat exchange component, thereby improving the product diversity of the carbon dioxide distillation tower and expanding the application range of the carbon dioxide distillation tower. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of a carbon dioxide dual-tower distillation and purification device according to an embodiment of the present invention;

[0024] Figure 2 This is a front view schematic diagram of a carbon dioxide dual-tower distillation and purification device according to one embodiment of the present invention;

[0025] Figure 3 This is a front sectional view of a carbon dioxide dual-tower distillation and purification device according to an embodiment of the present invention;

[0026] Figure 4 for Figure 3 Schematic diagram of the structure at point A in the middle.

[0027] Explanation of key figure labels:

[0028] 1-Distillation column, 101-Distillation packing layer, 102-Exhaust pipe, 103-Liquid reflux pipe, 104-Feed pipe, 105-Liquid outlet pipe, 2-Condensation reflux assembly, 201-Top heat exchanger, 202-Separation tank, 203-Separation packing, 204-Return pipe, 205-Heat exchange tube, 206-Connecting pipe, 207-Liquid delivery pipe, 3-Gas purification assembly, 301-Gas heat exchanger, 302-Guide pipe, 303-Heat exchange coil, 304-Discharge pipe, 305-Gas top pipe, 306-Condensation connecting pipe, 307-Top condenser, 308-Condensation tube, 309-Second separation tank, 310-Condensation connecting pipe, 311-Second separation packing, 312-Vent pipe, 313-Liquid guide pipe, 314-Liquid guide connecting pipe. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0030] like Figures 1 to 4As shown, a carbon dioxide dual-tower distillation and purification device in one embodiment of the present invention includes: a distillation tower 1, a condenser reflux assembly 2, and a gas phase purification assembly 3.

[0031] like Figure 3 As shown, multiple sets of uniformly distributed distillation packing layers 101 are fixedly installed inside the distillation column 1. The carbon dioxide feedstock transported inside the distillation column 1 is distilled and filtered through the multiple sets of distillation packing layers 101.

[0032] like Figure 1 As shown, an exhaust pipe 102 is fixedly connected to the top of the distillation column 1. The air distilled from the distillation column 1 is discharged through the exhaust pipe 102.

[0033] like Figure 1 As shown, a liquid reflux pipe 103 is fixedly connected to one side of the distillation packing layer 101. The liquid reflux pipe 103 is arranged between the exhaust pipe 102 and the distillation packing layer 101. The liquid reflux pipe 103 serves to connect the distillation column 1 and the separator 202, facilitating the return of the liquid carbon dioxide separated in the separator 202 to the distillation column 1.

[0034] like Figure 1 As shown, a feed pipe 104 is fixedly connected to one side of the distillation column 1, and the feed pipe 104 is arranged below multiple sets of distillation packing layers 101. The carbon dioxide feedstock to be processed is fed into the distillation column 1 through the feed pipe 104. A liquid phase outlet pipe 105 is fixedly connected to the side of the distillation column 1 opposite to the feed pipe 104. The liquid carbon dioxide at the bottom of the distillation column 1 is discharged through the liquid phase outlet pipe 105.

[0035] like Figure 1 As shown, the reflux condenser 2 is fixedly mounted on one side of the distillation column 1. The reflux condenser 2 includes a top heat exchanger 201, which is connected to the exhaust pipe 102. The air discharged from the exhaust pipe 102 is condensed through the top heat exchanger 201.

[0036] like Figure 3 As shown, heat exchange tubes 205 are fixedly installed inside the heat exchanger 201 at the top of the tower. The gas transported by the connecting pipe 206 is condensed by a low-temperature fluid flowing through the heat exchange tubes 205.

[0037] like Figure 3 As shown, a connecting pipe 206 connects the top heat exchanger 201 and the exhaust pipe 102. The connecting pipe 206 serves to connect the top heat exchanger 201 and the exhaust pipe 102, facilitating the flow and transport of gas within the distillation column 1.

[0038] like Figure 3As shown, the top heat exchanger 201 of the column is connected to a separation tank 202 on the side opposite to the distillation column 1, and the separation tank 202 is fixedly equipped with separation packing 203. Gas-liquid separation is performed in the separation tank 202 through the cooperation of the separation tank 202 and the separation packing 203.

[0039] like Figure 3 As shown, a return pipe 204 is fixedly connected between the separator 202 and the liquid return pipe 103. The return pipe 204 serves to connect the separator 202 and the liquid return pipe 103, facilitating the guiding and transportation of the liquid separated in the separator 202.

[0040] like Figure 3 As shown, a liquid delivery pipe 207 connects the top heat exchanger 201 and the separation tank 202. The liquid delivery pipe 207 is located below the connecting pipe 206 and the separation packing 203. The liquid delivery pipe 207 connects the top heat exchanger 201 and the separation tank 202, facilitating the transport of the condensed liquid carbon dioxide in the top heat exchanger 201 to the separation tank 202.

[0041] like Figure 1 As shown, the gas phase purification component 3 is arranged on one side of the separator 202. The gas phase purification component 3 includes a gas phase heat exchange tower 301, which is arranged on the side of the separator 202 away from the top heat exchanger 201. The gas phase heat exchange tower 301 serves to provide space for gas phase heat exchange.

[0042] like Figures 1 to 3 As shown, a guide pipe 302 is fixedly connected between the gas phase heat exchange tower 301 and the separation tank 202. The guide pipe 302 serves to connect the gas phase heat exchange tower 301 and the separation tank 202, facilitating the transport of gas in the separation tank 202 to the gas phase heat exchange tower 301 along the guide pipe 302.

[0043] like Figures 1 to 3 As shown, a discharge pipe 304 is fixedly connected to the side of the gas phase heat exchange tower 301 away from the guide pipe 302, and the discharge pipe 304 is arranged at the bottom of the gas phase heat exchange tower 301. The material inside the gas phase heat exchange tower 301 is discharged through the discharge pipe 304.

[0044] like Figures 3 to 4 As shown, multiple sets of heat exchange coils 303 are fixedly installed inside the guide pipe 302. Gas phase heat exchange is performed on the gas phase heat exchange tower 301 through the multiple sets of heat exchange coils 303.

[0045] like Figures 3 to 4As shown, a gas guide pipe 305 is fixedly connected to the top of the gas phase heat exchange tower 301. The gas inside the gas phase heat exchange tower 301 is conveyed and transported through the gas guide pipe 305. A condenser connecting pipe 306 is fixedly connected to one end of the gas guide pipe 305 located outside the gas phase heat exchange tower 301. The condenser connecting pipe 306 connects the gas guide pipe 305 to the top condenser 307, facilitating the transport of the gas inside the gas phase heat exchange tower 301 along the gas guide pipe 305 and the condenser connecting pipe 306 to the top condenser 307 for condensation.

[0046] like Figures 3 to 4 As shown, a tower top condenser 307 is fixedly connected to the end of the condensing connecting pipe 306 away from the gas guide pipe 305, and a condensing pipe 308 is fixedly installed inside the tower top condenser 307. The gas transported by the condensing connecting pipe 306 is condensed and heat exchanged by guiding the low-temperature fluid through the condensing pipe 308.

[0047] like Figures 3 to 4 As shown, a second separation tank 309 is installed on the side of the top condenser 307 away from the condensing connecting pipe 306. The second separation tank 309 performs gas-liquid separation on the top condenser 307. A condensing connecting pipe 310 is fixedly connected between the second separation tank 309 and the top condenser 307. The condensing connecting pipe 310 connects the top condenser 307 and the second separation tank 309, allowing the gas and liquid in the top condenser 307 to be transported to the second separation tank 309 along the condensing connecting pipe 310.

[0048] like Figures 3 to 4 As shown, a second separation packing 311 is fixedly installed inside the second separation tank 309. Gas-liquid separation is performed in the second separation tank 309 through the second separation packing 311. A vent pipe 312 is fixedly connected to the top of the second separation tank 309. The vent pipe 312 is used to exhaust gas from the second separation tank 309. A liquid guide pipe 313 is fixedly connected to the bottom of the second separation tank 309. Liquid is discharged from the second separation tank 309 through the liquid guide pipe 313.

[0049] like Figures 3 to 4 As shown, a liquid guiding pipe 314 connects the liquid guiding pipe 313 to the gas phase heat exchange tower 301. The liquid guiding pipe 314 serves to connect the liquid guiding pipe 313 and the gas phase heat exchange tower 301, facilitating the return of liquid carbon dioxide in the second separation tank 309 to the gas phase heat exchange tower 301.

[0050] In practical use, the carbon dioxide raw material to be processed can be transported to the distillation column 1 along the feed pipe 104. After being distilled by multiple sets of distillation packing layers 101, the liquid carbon dioxide accumulates at the bottom of the distillation column 1. The gas above the distillation column 1 can be transported to the heat exchanger 201 at the top of the column for heat exchange and condensation along the exhaust pipe 102 and the connecting pipe 206. The liquid and gas materials formed after heat exchange and condensation can be transported to the separator 202 along the liquid conveying pipe 207 for gas-liquid separation. The separated liquid can be returned to the distillation column 1 along the return pipe 204, thereby realizing the re-distillation and purification of carbon dioxide.

[0051] The gas in the separator 202 can be transported to the gas phase heat exchange tower 301 along the guide pipe 302. At the same time, the gas in the gas phase heat exchange tower 301 is transported to the top condenser 307 along the condensation connecting pipe 306. After being condensed and liquefied by the condensation pipe 308, the liquid is transported to the second separator 309 along the condensation connecting pipe 310. After gas-liquid separation, the liquid can flow back to the gas phase heat exchange tower 301 along the liquid guide pipe 313 and the liquid guide connecting pipe 314. The liquid can not only accumulate at the bottom of the gas phase heat exchange tower 301, but also generate gas phase carbon dioxide by heating through the heat exchange coil 303, thus achieving the purpose of simultaneously processing gas phase and liquid phase carbon dioxide.

[0052] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A carbon dioxide dual-tower distillation and purification device, characterized in that, include: A distillation column, wherein multiple uniformly distributed distillation packing layers are fixedly assembled inside the distillation column, an exhaust pipe is fixedly connected to the top of the distillation column, and a liquid reflux pipe is fixedly connected to one side of the distillation packing layer, the liquid reflux pipe being arranged between the exhaust pipe and the distillation packing layer. A reflux condenser assembly is fixedly installed on one side of the distillation column. The reflux condenser assembly includes a top heat exchanger connected to an exhaust pipe. A separation tank is connected to the side of the top heat exchanger away from the distillation column. Separation packing is fixedly installed inside the separation tank. A return pipe is fixedly connected between the separation tank and the liquid reflux pipe. A gas-phase purification component is arranged on one side of the separation tank. The gas-phase purification component includes a gas-phase heat exchange tower, which is arranged on the side of the separation tank away from the heat exchanger at the top of the tower. A guide pipe is fixedly connected between the gas-phase heat exchange tower and the separation tank, and multiple sets of heat exchange coils are fixedly installed inside the guide pipe.

2. The carbon dioxide dual-tower distillation and purification equipment according to claim 1, characterized in that, A feed pipe is fixedly connected to one side of the distillation column, and the feed pipe is arranged below multiple sets of distillation packing layers. A liquid phase outlet pipe is fixedly connected to the side of the distillation column opposite to the feed pipe.

3. The carbon dioxide dual-tower distillation and purification equipment according to claim 1, characterized in that, The heat exchanger at the top of the tower is fixedly equipped with heat exchange tubes, and a connecting pipe connects the heat exchanger at the top of the tower to the exhaust pipe.

4. The carbon dioxide dual-tower distillation and purification equipment according to claim 3, characterized in that, A liquid delivery pipe connects the heat exchanger at the top of the tower to the separation tank, and the liquid delivery pipe is located below the connecting pipe and the separation packing.

5. The carbon dioxide dual-tower distillation and purification equipment according to claim 1, characterized in that, A discharge pipe is fixedly connected to the side of the gas phase heat exchange tower away from the guide pipe, and the discharge pipe is arranged at the bottom of the gas phase heat exchange tower.

6. The carbon dioxide dual-tower distillation and purification equipment according to claim 1, characterized in that, A gas guide pipe is fixedly connected to the top of the gas phase heat exchange tower, and a condensation connecting pipe is fixedly connected to one end of the gas guide pipe located outside the gas phase heat exchange tower.

7. The carbon dioxide dual-tower distillation and purification equipment according to claim 6, characterized in that, The end of the condenser connecting pipe away from the top gas pipe is fixedly connected to a tower top condenser, and a condenser tube is fixedly installed inside the tower top condenser.

8. The carbon dioxide dual-tower distillation and purification equipment according to claim 7, characterized in that, A second separation tank is installed on the side of the top condenser away from the condensation connecting pipe, and a condensation connecting pipe is fixedly connected between the second separation tank and the top condenser.

9. The carbon dioxide dual-tower distillation and purification equipment according to claim 8, characterized in that, The second separation tank is fixedly equipped with a second separation packing material, a vent pipe is fixedly connected to the top of the second separation tank, and a liquid guide pipe is fixedly connected to the bottom of the second separation tank.

10. A carbon dioxide dual-tower distillation and purification apparatus according to claim 9, characterized in that, A liquid-conducting connecting pipe connects the liquid-conducting pipe to the gas-phase heat exchange tower.

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