Carbon dioxide aqueous solution desorption equipment

Abstract

The utility model relates to the technical field of carbon dioxide desorption equipment, in particular to carbon dioxide aqueous solution desorption equipment which comprises a desorption tower, a heating exhaust cavity, a heat exchange cavity and a liquid discharge cavity are sequentially arranged in the desorption tower from top to bottom, and every two adjacent cavities are separated by a tube plate; a heating pipe is arranged in the heating exhaust cavity, and a heat exchange pipe is arranged in the heat exchange cavity; an exhaust port is formed in the heating exhaust cavity, a liquid inlet is formed in the heat exchange cavity, and a liquid outlet is formed in the liquid outlet cavity; according to the carbon dioxide desorption device, the heat exchange pipe is arranged in the heat exchange cavity, and heat exchange can be carried out on a hot solution which is heated and exhausted and a newly entering cold solution, so that the requirements on the heating amount of the cold solution and the cooling amount of the hot solution are effectively reduced, the energy consumption loss in the carbon dioxide desorption process is greatly reduced, and the economic benefit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon dioxide desorption equipment, and specifically relates to a carbon dioxide aqueous solution desorption equipment. Background Art

[0002] The carbon dioxide aqueous solution desorption device is a specially designed equipment for releasing and recovering carbon dioxide from the carbon dioxide-rich aqueous solution. This device plays an important role in the carbon capture, utilization and storage (CCUS) technology, aiming to reduce the carbon dioxide content in industrial emissions to address the global warming problem.

[0003] In the prior art, the carbon dioxide aqueous solution desorption system usually includes a packing tower, a reboiler, an oil bath heating circulation system, etc.; the aqueous solution flowing out of the tower usually remains at a high temperature and needs to go through an additional cooling step before it can enter the adsorption tower device again for recycling, which increases additional equipment investment and affects the system operation efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a carbon dioxide aqueous solution desorption equipment that can effectively utilize the excess heat of the solution.

[0005] Based on the above purpose, the utility model adopts the following technical scheme:

[0006] A carbon dioxide aqueous solution desorption equipment, including a desorption tower, a heat exchange cavity is arranged in the desorption tower, and a liquid inlet is connected to the bottom of the heat exchange cavity; a plurality of heat exchange tubes are arranged along the length direction inside the heat exchange cavity, and both ends of the heat exchange tubes are set to be open; a heating exhaust cavity is arranged above the heat exchange tubes, and an exhaust port is arranged at the top of the heating exhaust cavity; a liquid discharge cavity is arranged below the heat exchange tubes, and a liquid discharge port is arranged at the bottom of the liquid discharge cavity.

[0007] Preferably, a pair of tube sheets are respectively arranged at the top and bottom of the heat exchange cavity, and a plurality of heat exchange holes matching with the heat exchange tubes are arranged on the pair of tube sheets, and both ends of the heat exchange tubes are fixedly arranged in the heat exchange holes;

[0008] Preferably, the tube sheet includes an upper tube sheet and a lower tube sheet, the upper tube sheet is arranged at the top of the heat exchange cavity, and the lower tube sheet is arranged at the bottom of the heat exchange cavity; a plurality of overflow holes are arranged on the upper tube sheet, and the overflow holes are through holes.

[0009] Preferably, the openings at both ends of the heat exchange tubes are respectively arranged on the top surface of the upper tube sheet and the bottom surface of the lower tube sheet, and the heating exhaust cavity and the liquid discharge cavity are communicated with each other through the heat exchange tubes.

[0010] Preferably, a plurality of baffle plates are horizontally arranged in the heat exchange cavity, and through holes matching with the heat exchange tubes are arranged on the baffle plates.

[0011] Preferably, liquid level gauges are provided on both the heating exhaust cavity and the liquid discharge cavity.

[0012] The beneficial effects of the present utility model are as follows:

[0013] The present utility model enables the high-temperature solution heated by the heating tube to overflow into the heat exchange tube. The heat exchange tube arranged in the heat exchange cavity can conduct heat exchange between the high-temperature solution and the newly-entered low-temperature solution, cooling the high-temperature solution and heating the low-temperature solution. When the newly-entered low-temperature solution rich in carbon dioxide reaches the top of the heat exchange cavity, it can already be heated to about 90°C, while the high-temperature solution that has released carbon dioxide can be cooled to about 12°C when it reaches the liquid discharge cavity from the heat exchange tube. In this way, the waste heat of the high-temperature solution is fully utilized to heat the low-temperature solution, and at the same time, the low-temperature solution is used to cool the high-temperature solution, which can greatly reduce the heating demand for the low-temperature solution and the cooling demand for the high-temperature solution. The required heating amount and cooling amount are both very small, effectively reducing the energy consumption loss in the carbon dioxide desorption process and enhancing the economic benefits of the carbon dioxide desorption process. Description of the Drawings

[0014] Figure 1 is the front view of the overall structure of the present utility model;

[0015] Figure 2 is the top view of the upper tube sheet of the present utility model;

[0016] Figure 3 is the top view of the lower tube sheet of the present utility model.

[0017] In the figure: heat exchange tube 1; baffle plate 2; tube sheet 3; upper tube sheet 31; overflow hole 32; tube hole 33; lower tube sheet 34; lifting screw hole 35; pull rod hole 36; liquid level gauge 4; heating tube 5; liquid inlet 6; exhaust port 7; liquid discharge port 8. Detailed Embodiments

[0018] The following is a further explanatory description of the present utility model in combination with specific embodiments. As Figure 1 shown, this embodiment is a carbon dioxide aqueous solution desorption device, which mainly includes a vertically arranged desorption tower; in the desorption tower, it is divided into a heating exhaust cavity, a heat exchange cavity, and a liquid discharge cavity from top to bottom in sequence, and each two adjacent cavities are separated by a horizontally arranged tube sheet 3.

[0019] At the top of the desorption tower, i.e., at the top of the heating exhaust chamber, an exhaust port 7 is provided; at the bottom of the desorption tower, i.e., at the bottom of the liquid discharge chamber, a liquid discharge port 8 is provided; at the bottom side of the heat exchange chamber, a liquid inlet 6 is provided; the carbon dioxide-rich solution enters the desorption tower from the liquid inlet 6, undergoes heat exchange in the heat exchange chamber, and then is further heated by the heating tube 5 in the heating exhaust chamber. After all the dissolved carbon dioxide gas inside it escapes, it enters the liquid discharge chamber and is discharged from the desorption tower through the liquid discharge port 8.

[0020] In the heat exchange chamber, a plurality of heat exchange tubes 1 are provided; both ends of the heat exchange tube 1 are fixedly arranged on two tube sheets 3 respectively, making the heat exchange tube 1 vertically arranged, and its length direction is the same as the height direction of the desorption tower; the heat exchange tube 1 is made of corrosion-resistant material, and both ends of it are set as openings. The opening at the top is arranged on the top surface of the upper tube sheet 31, and the opening at the bottom is arranged on the bottom surface of the lower tube sheet 34, so that the heating exhaust chamber and the liquid discharge chamber are interconnected through the heat exchange tube 1; then the solution after completing heating and exhaust in the heating exhaust chamber can enter the heat exchange tube 1 and flow downward through the heat exchange chamber into the liquid discharge chamber to be discharged from the liquid discharge port 8.

[0021] As Figure 2 shown, a plurality of tube holes 33 are provided on the upper tube sheet 31. As Figure 3 shown, a plurality of tube holes 33 that cooperate with the upper tube sheet 31 are also provided on the lower tube sheet 34; both ends of each heat exchange tube 1 are respectively fixedly arranged in a pair of corresponding tube holes 33 on the upper tube sheet 31 and the lower tube sheet 34, making the heat exchange tube 1 fixedly arranged; in addition to the tube holes 33, a plurality of overflow holes 32 are also provided on the upper tube sheet 31; the overflow holes 32 are through holes, which can make the solution in the heat exchange chamber overflow from the overflow holes 32, that is, the solution can enter the heating exhaust chamber through the overflow holes 32; no overflow holes 32 are provided on the lower tube sheet 34, but lifting screw holes 35 and pull rod holes 36 for installation and fixation are provided; both the lifting screw holes 35 and the pull rod holes 36 are blind holes. Then when all the tube holes 33 on the lower tube sheet 34 are filled with the heat exchange tubes 1, the heat exchange chamber and the liquid discharge chamber are in a closed state, and the newly entered solution must pass through the heating exhaust chamber upward before it can enter the liquid discharge chamber through the heat exchange tube 1.

[0022] A plurality of baffle plates 2 are also horizontally arranged in the heat exchange chamber; the baffle plates 2 are used to change the flow path of the solution, making its residence time in the heat exchange chamber longer, so as to more fully exchange heat and increase the temperature with the hot solution in the heat exchange tube 1; liquid level gauges 4 are respectively provided on the heating exhaust chamber and the liquid discharge chamber, and the liquid level gauges 4 are used to monitor the liquid level heights in the heating exhaust chamber and the liquid discharge chamber, to avoid phenomena such as the solution overflowing from the exhaust port 7 or the solution in the heat exchange tube 1 flowing back due to too high a flow rate at the liquid inlet 6 or blockage somewhere, resulting in poor solution flow and too high a liquid level in the heating exhaust chamber or the liquid discharge chamber.

[0023] In actual use of this embodiment, the liquid inlet 6 is connected to the pipeline of the aqueous solution rich in carbon dioxide discharged from the adsorption tower, the exhaust port 7 is connected to the carbon dioxide collection pipeline, and the liquid discharge port 8 is connected to the pipeline of the chiller; when the carbon dioxide adsorption tower starts to work, it will discharge an aqueous solution rich in carbon dioxide, and the solution enters the desorption tower through the liquid inlet 6; since the lower tube sheet 34 is in a sealed state, the solution must flow upward in the heat exchange cavity and enter the heating and exhaust cavity through the overflow hole 32 of the upper tube sheet 31.

[0024] A heating pipe 5 is arranged at the bottom of the heating and exhaust cavity, and the dissolved carbon dioxide gas is discharged after the solution is heated by the heating pipe 5; the hot solution discharged of carbon dioxide gas can enter the heat exchange tube 1 through the tube hole 33 of the upper tube sheet 31, flow downward through the heat exchange tube 1, pass through the heat exchange cavity, and enter the liquid discharge cavity; during the process of the hot solution passing through the heat exchange tube 1, the newly entered low-temperature solution in the heat exchange cavity will exchange heat with the hot solution, so that the low-temperature solution is heated and the hot solution is cooled; when the newly entered low-temperature solution reaches the heating and exhaust cavity, it will be heated to about 90 °C by the hot solution, and when the hot solution reaches the liquid discharge cavity after being cooled by the low-temperature solution, its temperature will be reduced to about 12 °C; thus, the solution in the heating and exhaust cavity only needs a little heating to reach the exhaust temperature to discharge carbon dioxide gas, and at the same time, the solution discharged through the liquid discharge port 8 in the liquid discharge cavity only needs to be simply cooled in the chiller and then can be re-input into the adsorption tower to participate in the carbon dioxide capture work again.

[0025] As described above, it is only a further explanatory description of the present invention in combination with specific embodiments. All the descriptions made do not represent a limitation on the protection scope of the present invention. Any change or replacement scheme that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A carbon dioxide aqueous solution desorption device, comprising a desorption tower, characterized in that: A heat exchange chamber is arranged in the desorption tower, and a liquid inlet is connected to the bottom of the heat exchange chamber; a plurality of heat exchange tubes are arranged inside the heat exchange chamber along the length direction, and both ends of the heat exchange tubes are set as openings; a heating exhaust chamber is arranged above the heat exchange tube, and an exhaust port is arranged at the top of the heating exhaust chamber; a drainage chamber is arranged below the heat exchange tube, and a drainage port is arranged at the bottom of the drainage chamber.

2. The carbon dioxide aqueous solution desorption device according to claim 1, characterized in that: A pair of tube sheets are respectively arranged at the top and the bottom of the heat exchange chamber, and a plurality of heat exchange holes cooperating with the heat exchange tubes are arranged on each of the tube sheets, and both ends of the heat exchange tubes are fixedly arranged in the heat exchange holes.

3. The carbon dioxide aqueous solution desorption device according to claim 2, characterized in that: The tube sheet comprises an upper tube sheet and a lower tube sheet, wherein the upper tube sheet is arranged at the top of the heat exchange chamber, and the lower tube sheet is arranged at the bottom of the heat exchange chamber; a plurality of overflow holes are arranged on the upper tube sheet, and the overflow holes are through holes.

4. The carbon dioxide aqueous solution desorption device according to claim 3, characterized in that: The openings at both ends of the heat exchange tube are respectively arranged on the top surface of the upper tube plate and the bottom surface of the lower tube plate, and the heating exhaust cavity and the drainage cavity are connected to each other through the heat exchange tube.

5. The carbon dioxide aqueous solution desorption device according to claim 1, characterized in that: A plurality of baffles are horizontally arranged in the heat exchange chamber, and through holes cooperating with the heat exchange tubes are arranged on the baffles.

6. The carbon dioxide aqueous solution desorption device according to claim 1, characterized in that: The heating exhaust cavity and the liquid discharge cavity are both provided with liquid level gauges.

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