Drying tower suitable for CO2 regeneration and purification

Abstract

The invention discloses a drying tower suitable for regeneration and purification of CO2, the drying tower comprises a tower body with an inlet and an outlet, a cooling mechanism and an adsorption layer, the cooling mechanism and the adsorption layer located above the cooling mechanism are arranged in the tower body, the cooling mechanism is used for condensing and dehydrating CO2 input from the inlet, the dehydrated CO2 is adsorbed and dried again through the adsorption layer, and the adsorption layer is used for adsorbing and drying CO2. Compared with the prior art, the method can reduce the content of water vapor entering the drying tower, prolong the operation cycle of the adsorbent and reduce the drying regeneration energy consumption, and has industrial application prospects.

Description

Technical Field

[0001] The present invention relates to a method suitable for CO 2 Regeneration and purification drying tower, specifically a CO 2 Air cooler for regenerated gas temperature and humidity, belonging to CO 2 Regeneration and purification field. Background Art

[0002] Current CO in industry 2 The concentration has exceeded 400ppm, which is 50% higher than that during the Industrial Revolution. The resulting greenhouse effect poses a major threat to human activities and the environment. CCUS (carbon dioxide capture, utilization and storage technology) has received increasing attention because it helps reduce greenhouse gas emissions and achieve resource recycling. In the CCUS process chain, CO 2 Drying and regeneration is one of the key links to ensure efficient and stable operation of the entire system. CO captured from industrial emission sources 2 The air source often contains a certain amount of water and amine liquid, which makes the air source humidity too high, not only reducing the CO 2 The purity of CO will also have an adverse effect on the subsequent transportation, utilization and storage process. 2 Before further processing or utilization, it needs to be effectively dried.

[0003] The traditional two-tower equipment adopts an alternating working mode, with one tower performing CO 2 During adsorption drying, the other tower regenerates the adsorbent and removes the adsorbed moisture by heating or reducing pressure. However, this method has high regeneration energy consumption. Currently, the three-tower system has been used in the industry, with a pre-adsorption tower added on the basis of the two towers. Although this reduces the regeneration energy consumption, it also increases the equipment investment cost. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to provide a method suitable for CO 2 The regeneration and purification drying tower can reduce the water vapor content entering the drying tower, increase the operating cycle of the adsorbent, and reduce the energy consumption of drying and regeneration, and has industrial application prospects.

[0005] To achieve the above object, the present invention proposes a method suitable for CO 2 The regeneration and purification drying tower comprises a tower body with an inlet and an outlet, a cooling mechanism and an adsorption layer. The tower body is provided with a cooling mechanism and an adsorption layer located above the cooling mechanism. The cooling mechanism is used to cool the CO2 inputted from the inlet. 2 Condensation and dehydration are performed, and the dehydrated CO 2 Adsorption drying is performed again through the adsorption layer.

[0006] Preferably, the cooling mechanism includes an upper partition, a lower partition, a partition enclosure, a plurality of heat exchange tubes, a heat exchanger and a connecting port. A partition enclosure is provided between the upper partition and the lower partition. An inlet is provided on the tower body between the upper partition and the lower partition. The heat exchange tubes are arranged on the outside of the partition enclosure. The heat exchanger is located inside the partition enclosure. Both ends of the tube path of the heat exchanger are respectively connected to the space above the upper partition and the space below the lower partition. A connecting port is provided on the lower partition.

[0007] Preferably, the front and rear outer spaces of the partition enclosure are both provided with heat exchange tubes arranged in an array, the inlet is connected with an outer space of the partition enclosure where no heat exchange tubes are provided, and the connecting port is located in another outer space of the partition enclosure where no heat exchange tubes are provided.

[0008] Preferably, the heat exchange tube is a finned tube.

[0009] Preferably, the fin tube is a spiral fin tube.

[0010] Preferably, the fins of the spiral finned tube are made of copper material with a high heat transfer coefficient, and the outer surface of the fin is coated with an anti-corrosion material.

[0011] Preferably, the base tube of the spiral fin tube is made of stainless steel, the fins and the base tube are connected by mechanical winding, and the two are tightly linked together by flange clamps and bolts.

[0012] Preferably, a microstructure is provided on the fin surface of the spiral fin tube.

[0013] Preferably, the finning ratio of the spiral finned tube is set between 17 and 28.

[0014] Preferably, two front and rear rows of baffles I are provided in the tower body between the cooling mechanism and the adsorption layer, and the baffles I in each row are arranged in sequence from top to bottom, and the front baffles I are staggered with the rear baffles I.

[0015] Beneficial effects of the present invention: The present invention provides a cooling mechanism and an adsorption layer above the cooling mechanism in the tower body, wherein the cooling mechanism is used to cool the CO input from the inlet. 2 Condensation and dehydration are performed, and the dehydrated CO 2 Compared with the prior art, the adsorption drying is performed again through the adsorption layer, which can reduce the water vapor content entering the drying tower, increase the operating cycle of the adsorbent, and reduce the energy consumption of drying regeneration, and has industrial application prospects.

[0016] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a kind of CO2 Schematic diagram of the structure of a drying tower for regeneration and purification.

[0018] In the figure: 1-tower body, 2-cooling mechanism, 3-adsorption layer, 4-baffle, 11-inlet, 12-outlet, 21-upper partition, 22-lower partition, 23-partition enclosure, 24-heat exchange tube, 25-heat exchanger, 26-connecting port. DETAILED DESCRIPTION

[0019] Example 1 See also Figure 1 The present invention is suitable for CO 2 The regeneration and purification drying tower comprises a tower body 1 with an inlet 11 and an outlet 12, a cooling mechanism 2 and an adsorption layer 3. The tower body 1 is provided with a cooling mechanism 2 and an adsorption layer 3 located above the cooling mechanism 2. The cooling mechanism 2 is used to cool the CO input from the inlet 11. 2 Condensation and dehydration are performed, and the dehydrated CO 2 Adsorption drying is performed again through the adsorption layer 3.

[0020] The cooling mechanism 2 includes an upper partition 21, a lower partition 22, a partition enclosure 23, a plurality of heat exchange tubes 24, a heat exchanger 25 and a connecting port 26. A partition enclosure 23 is provided between the upper partition 21 and the lower partition 22. An inlet 11 is provided on the tower body 1 between the upper partition 21 and the lower partition 22. The heat exchange tubes 24 are provided on the outside of the partition enclosure 23. The heat exchanger 25 is located in the partition enclosure 23. Both ends of the tube path of the heat exchanger 25 are respectively connected to the space above the upper partition 21 and the space below the lower partition 22. A connecting port 26 is provided on the lower partition 22.

[0021] Heat exchange tubes 24 arranged in an array are provided in both the front and rear outer spaces of the partition enclosure 23 , the inlet 11 is connected to an outer space of the partition enclosure 23 where no heat exchange tube 24 is provided, and the connecting port 26 is located in another outer space of the partition enclosure 23 where no heat exchange tube 24 is provided.

[0022] The heat exchange tube 24 is a fin tube.

[0023] The fin tubes are spiral fin tubes.

[0024] The fins of the spiral finned tube are made of copper material with high heat transfer coefficient, and the outer surface of the fin is coated with anti-corrosion material.

[0025] The base tube of the spiral fin tube is made of stainless steel, the fins and the base tube are connected by mechanical winding, and the two are tightly linked together by flange clamps and bolts.

[0026] The fin surface of the spiral fin tube is provided with a microstructure.

[0027] The finning ratio of the spiral finned tube is set between 17 and 28.

[0028] Two front and rear rows of baffles I4 are arranged in the tower body 1 between the cooling mechanism 2 and the adsorption layer 3. The baffles I4 in each row are arranged in sequence from top to bottom, and the front baffles I4 are staggered with the rear baffles I4.

[0029] Example 2 The cold materials of the heat exchange tube 24 and the heat exchanger 25 are all from the residual cold generated in the CO2 liquefaction process, which fully utilizes the cold energy in the process to achieve the purpose of energy saving.

[0030] Example 3 The space of the tower body 1 below the lower partition plate 22 is used for collecting condensed water. A drain outlet is provided at the lower end of the tower body 1, and a valve is provided on the drain outlet.

[0031] Example 4 The heat exchanger 25 is a wound tube heat exchanger, and a baffle II is provided in the tube of the wound tube heat exchanger.

[0032] Example 5 The adsorption layer 3 is a molecular sieve adsorption layer.

[0033] Working process of the present invention: The present invention is suitable for CO 2 During the operation of the regeneration and purification drying tower, CO at 90~110℃ 2 The gas enters the internal space on the corresponding side of the partition enclosure 23 from the inlet 11, and then passes through the heat exchange tube 24 for cooling and condensation, but it is difficult to produce condensed water. The cooled CO 2 The gas enters the tower body 1 below the lower baffle 22 through the connecting port 26, and then undergoes secondary condensation through the heat exchanger 25. 2 It passes through the baffle I4, then passes through the adsorption layer 3 for adsorption and drying, and is finally discharged from the outlet 12.

[0034] When the moisture adsorbed by the adsorption layer 3 is close to saturation, desorption is performed by isobaric drying.

[0035] The finned tube adopts a spiral finned tube spiral design to cause the fluid to generate strong disturbance and vortex during the flow process, thereby improving the heat transfer effect.

[0036] The fins of the spiral fin tube are made of copper material with high heat transfer coefficient, and the outer surface of the fin is coated with anti-corrosion material, which can have a high heat transfer coefficient. Considering that the organic amines carried in the airflow are corrosive to the equipment to a certain extent, the outer surface of the fin needs to be coated with anti-corrosion material to improve the durability of the equipment.

[0037] The base tube of the spiral fin tube is made of stainless steel, the fins and the base tube are connected by mechanical winding, and the two are tightly linked together by flange clamps and bolts. This method has a firm connection and is easy to disassemble.

[0038] The fin surface of the spiral fin tube is provided with a microstructure, which is a convex or concave structure, and is used to increase the specific surface area and improve the heat transfer coefficient.

[0039] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A drying tower suitable for CO2 regeneration and purification, characterized in that: The invention comprises a tower body (1) having an inlet (11) and an outlet (12), a cooling mechanism (2) and an adsorption layer (3). The tower body (1) is provided with a cooling mechanism (2) and an adsorption layer (3) located above the cooling mechanism (2). The cooling mechanism (2) is used to condense and dehydrate CO2 inputted through the inlet (11), and the dehydrated CO2 is adsorbed and dried again by the adsorption layer (3).

2. A drying tower suitable for CO2 regeneration and purification as claimed in claim 1, characterized in that: The cooling mechanism (2) comprises an upper baffle (21), a lower baffle (22), a partition enclosure (23), a plurality of heat exchange tubes (24), a heat exchanger (25) and a connecting port (26); a partition enclosure (23) is provided between the upper baffle (21) and the lower baffle (22); an inlet (11) is provided on the tower body (1) between the upper baffle (21) and the lower baffle (22); the heat exchange tubes (24) are provided on the outside of the partition enclosure (23); the heat exchanger (25) is located inside the partition enclosure (23); two ends of the tube path of the heat exchanger (25) are respectively connected to the space above the upper baffle (21) and the space below the lower baffle (22); and a connecting port (26) is provided on the lower baffle (22).

3. A drying tower suitable for CO2 regeneration and purification as claimed in claim 2, characterized in that: Heat exchange tubes (24) arranged in an array are provided in both the front and rear outer spaces of the partition enclosure (23); the inlet (11) is connected to an outer space of the partition enclosure (23) where no heat exchange tubes (24) are provided; and the connecting port (26) is located in another outer space of the partition enclosure (23) where no heat exchange tubes (24) are provided.

4. A drying tower suitable for CO2 regeneration and purification as claimed in claim 2, characterized in that: The heat exchange tube (24) is a finned tube.

5. A drying tower suitable for CO2 regeneration and purification as claimed in claim 4, characterized in that: The fin tubes are spiral fin tubes.

6. A drying tower suitable for CO2 regeneration and purification as claimed in claim 5, characterized in that: The fins of the spiral finned tube are made of copper material with high heat transfer coefficient, and the outer surface of the fin is coated with anti-corrosion material.

7. A drying tower suitable for CO2 regeneration and purification as claimed in claim 5, characterized in that: The base tube of the spiral fin tube is made of stainless steel, the fins and the base tube are connected by mechanical winding, and the two are tightly linked together by flange clamps and bolts.

8. A drying tower suitable for CO2 regeneration and purification as claimed in claim 5, characterized in that: The fin surface of the spiral fin tube is provided with a microstructure.

9. A drying tower suitable for CO2 regeneration and purification as claimed in claim 5, characterized in that: The finning ratio of the spiral finned tube is set between 17 and 28.

10. A drying tower suitable for CO2 regeneration and purification according to any one of claims 1 to 9, characterized in that: Two front and rear rows of baffles I (4) are arranged in the tower body (1) between the cooling mechanism (2) and the adsorption layer (3), and the baffles I (4) in each row are arranged in sequence from top to bottom, and the front baffles I (4) and the rear baffles I (4) are arranged in an alternating manner.

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