Fixed bed carbon dioxide adsorption device capable of supplementing organic amine on line

Abstract

The utility model belongs to the technical field of carbon dioxide capture, and discloses a fixed bed carbon dioxide adsorption device capable of supplementing organic amine on line, which comprises a shell, partition plates, solid amine adsorbents, a liquid filling pipe and a spray pipe, the partition plates are perpendicular to the axial direction of the shell and are arranged in the shell in a layered manner, and the solid amine adsorbents are filled between the partition plates or stacked on the partition plates. The liquid filling pipe extends downwards from the top of the shell to the partition plates, spray pipes are arranged on the partition plates and spray organic amine solutions to the solid amine adsorbents on the corresponding partition plates, the liquid filling pipe is communicated with the spray pipes, an inlet in the upper end of the liquid filling pipe is communicated with a liquid storage tank of the organic amine solutions through a solution input pipe, and the solution input pipe is connected with an input pump. According to the utility model, the solid amine adsorbent can be continuously impregnated in the adsorption device, and the dosage of an organic amine solution and the loss of the solid amine adsorbent can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of carbon dioxide capture, and in particular relates to a fixed bed carbon dioxide adsorption device for online supplementation of organic amines. Background Art

[0002] Adsorption-based carbon dioxide capture technology has the advantages of low energy consumption, high stability, sustainability, no corrosion, simple equipment, and easy operation, and has greater application potential in the future. At present, the more mature carbon dioxide capture process is the chemical absorption method, among which organic amine absorbent is a type of adsorbent with good capture effect. However, the liquid organic amine absorbent used has the disadvantages of high corrosiveness, high regeneration energy consumption, and fast degradation rate, which limits its widespread application in large-scale industrial emission sources. Solid amine adsorbent is a new type of solid adsorbent that uses organic amines on a solid porous material substrate. It is different from other solid adsorbents and can capture carbon dioxide using the principle of chemical adsorption, which increases its selectivity for adsorbing carbon dioxide and avoids the many shortcomings of liquid organic amine adsorbents.

[0003] After a period of use, the adsorption performance of the solid amine adsorbent in the carbon dioxide capture device will decrease, affecting the carbon dioxide capture efficiency, so the adsorbent needs to be replaced regularly. The main reason for the decrease in adsorption performance is the loss of organic amines generated during the use of the capture device, which leads to a reduction in carbon dioxide adsorption sites. The current solution of the prior art is to regularly replace the solid amine adsorbent. The replacement of the adsorbent takes time and may also cause damage to the solid amine adsorbent and the adsorption equipment. If the replaced solid amine adsorbent is regenerated by adding organic amine, additional equipment is required. Therefore, the replacement and regeneration of the solid amine adsorbent in the prior art will increase equipment costs and losses, and may also affect the operating efficiency of the system. In addition, the existing organic amine supplementation technology for completely immersing the solid amine adsorbent to achieve excessive impregnation also has the defects of using a large amount of organic amine solution and causing partial pulverization of the solid amine adsorbent due to excessive immersion, which also needs to be solved. Utility Model Content

[0004] The utility model aims to provide a fixed-bed carbon dioxide adsorption device for online supplementation of organic amines, which is used to solve the technical problems in the prior art of increasing equipment cost and loss when supplementing organic amines to a solid amine adsorbent that supports organic amines on a substrate by impregnation, and causing excessive use of organic amine solution and pulverization of the solid amine adsorbent by excessive impregnation.

[0005] The fixed-bed carbon dioxide adsorption device for online supplementation of organic amines comprises a shell, a partition, a solid amine adsorbent, a liquid filling pipe and a nozzle, wherein the partition is perpendicular to the axial direction of the shell and is arranged in layers in the shell, the solid amine adsorbent is filled between the partitions or accumulated on the partitions, the liquid filling pipe extends downward from the top of the shell to the partition, the nozzle is arranged on the partition, and the nozzle sprays organic amine solution to the solid amine adsorbent on the corresponding partition, the liquid filling pipe is connected to each nozzle, and the inlet at the upper end of the liquid filling pipe is connected to the liquid storage tank of the organic amine solution through a solution input pipe, and the solution input pipe is connected to an input pump.

[0006] Preferably, the partition is circular and has a fan-shaped notch, the fan-shaped notches between the upper and lower adjacent partitions are staggered, an annular mounting piece is fixed to the inner wall of the shell, and the partition is fixed on the annular mounting piece.

[0007] Preferably, the liquid filling pipe passes through the center of the partition, a plurality of the nozzles are provided and radially arranged on the partition, the nozzles are evenly arranged circumferentially on the partition, and each nozzle is provided with a plurality of nozzles arranged upward.

[0008] Preferably, a sampling port is provided on the side of the shell for sampling the solid amine adsorbent, and a flow meter is provided on the solution input pipe.

[0009] Preferably, a liquid level detection device is provided in the liquid storage tank, and the liquid level detection device is used to detect the liquid level height of the liquid in the liquid storage tank.

[0010] The utility model has the following advantages: the utility model absorbs carbon dioxide through solid amine adsorbent, and after the organic amine, the active component of carbon dioxide adsorbent, is lost, the adsorption device in the scheme can input the organic amine solution from the external organic amine solution storage tank for impregnation of the solid amine adsorbent. At the same time, the device does not adopt the excessive impregnation method of completely immersing the solid amine adsorbent, but adopts the dry spray impregnation of the solid amine adsorbent by continuous spraying of the organic amine solution, which greatly reduces the amount of organic amine solution used in the excessive impregnation method, and the solid amine adsorbent is not easy to be powdered. Therefore, the scheme not only realizes the continuous impregnation of the solid amine adsorbent in the adsorption device, but also does not need to replace and remove the solid amine adsorbent, and does not need to use additional regeneration impregnation equipment, and can also reduce the amount of organic amine solution and the loss of solid amine adsorbent. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a structural schematic diagram of a fixed bed carbon dioxide adsorption device for online supplementation of organic amines.

[0012] Figure 2 for Figure 1Schematic diagram of the structure of the internal partition structure of the shell in the structure shown.

[0013] The reference numerals in the accompanying drawings include: 1, liquid storage tank, 2, shell, 3, input pump, 4, flow meter, 5, solid amine adsorbent, 6, solution input pipe, 7, sampling port, 8, liquid level detection device, 9, gas analyzer, 10, filling pipe, 11, flue gas input pipe, 12, flue gas output pipe, 13, desorption gas input pipe, 14, desorption gas output pipe, 15, partition, 16, annular mounting part, 17, nozzle, 18, nozzle, 19, fan-shaped notch. DETAILED DESCRIPTION

[0014] The following is a further detailed description of the specific implementation methods of the utility model by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the utility model.

[0015] like Figure 1-Figure 2 As shown, the utility model provides a fixed-bed carbon dioxide adsorption device for online supplementation of organic amines, comprising a shell 2, a partition 15, a solid amine adsorbent 5, a liquid filling pipe 10 and a nozzle 17, wherein the partition 15 is perpendicular to the axial direction of the shell 2 and is arranged in layers in the shell 2, the solid amine adsorbent 5 is filled between the partitions 15 or piled on the partitions 15, the liquid filling pipe 10 extends downward from the top of the shell 2 to the partition 15, the nozzle 17 is arranged on the partition 15, the nozzle 17 sprays organic amine solution to the solid amine adsorbent 5 on the corresponding partition 15, the liquid filling pipe 10 is connected to each nozzle 17, the inlet at the upper end of the liquid filling pipe 10 is connected to the liquid storage tank 1 of the organic amine solution through the solution input pipe 6, and the solution input pipe 6 is connected to the input pump 3 for providing infusion pressure to the organic amine solution.

[0016] The above-mentioned adsorption device inputs organic amine solution from the external organic amine solution storage tank 1 for impregnation of the solid amine adsorbent 5, achieving the effect of using the online adsorption device to supplement the organic amine impregnation. At the same time, the device adopts a dry spray impregnation method to continuously spray the solid amine adsorbent 5 with the organic amine solution, which greatly reduces the amount of organic amine solution used in the excessive impregnation method, and the solid amine adsorbent 5 is not easy to pulverize. In order not to affect the continuous operation of the entire carbon dioxide capture system, the above-mentioned adsorption device can also be set in parallel in the carbon dioxide capture system. In this way, when an adsorption device needs to be supplemented with organic amine, the entire capture system can continue to capture and adsorb carbon dioxide through other adsorption devices, and can also realize the alternating operation of carbon dioxide adsorption and desorption with other adsorption devices of the same structure.

[0017] The partition 15 is circular and has a fan-shaped notch 19, and the central angle of the fan-shaped notch 19 is 90°. The fan-shaped notches 19 between the upper and lower adjacent partitions 15 are staggered. An annular mounting member 16 is fixed to the inner wall of the shell 2, and the partition 15 is fixed on the annular mounting member 16. A sampling port 7 is provided on the side of the shell 2 for sampling the solid amine adsorbent 5. The flow meter 4 is provided on the solution input pipe 6 to detect the flow rate of the input organic amine solution. Since the present scheme adopts dry spray impregnation, which belongs to the equal volume impregnation method, it is necessary to control the flow rate of the upward spray to avoid excessive flow rate causing the organic amine solution to overflow.

[0018] The filling pipe 10 passes through the center of the partition 15, and each nozzle 17 is connected to the filling pipe 10; a plurality of nozzles 17 are provided and radially arranged on the partition 15, and the nozzles 17 are evenly arranged circumferentially on the partition 15. In this way, the solid amine adsorbent 5 on the partition 15 can be sprayed evenly, so that the amount of organic amine solution received by the solid amine adsorbent 5 at each location is close. Furthermore, each nozzle 17 is provided with a plurality of nozzles 18 arranged upward, and the nozzles 18 are evenly arranged along the direction in which the nozzles 17 are arranged.

[0019] The top of the housing 2 is also connected to a smoke output pipe 12 and a desorption gas input pipe 13, and the bottom of the housing 2 is provided with a smoke input pipe 11 and a desorption gas output pipe 14. The smoke output pipe 12 is provided with a gas analyzer 9 for analyzing the carbon dioxide concentration. By analyzing the carbon dioxide concentration, it can be determined whether the adsorption effect of the adsorption device has deteriorated. When the carbon dioxide concentration is higher than a certain threshold, an organic amine solution can be input to supplement the organic amine.

[0020] The liquid storage tank 1 is provided with a liquid level detection device 8, which is used to detect the liquid level height of the liquid in the liquid storage tank 1. The volume of the organic amine solution stored in the liquid storage tank 1 is greater than the volume continuously input into the pipeline system and the adsorption device when replenishing the organic amine, so the present solution can continuously output the organic amine solution during the replenishment of the organic amine, avoiding the failure of normal output due to the low liquid level of the solution in the later stage.

[0021] The working process of organic amine supplementation in this scheme includes: first, judging whether organic amine supplementation is needed according to the measured carbon dioxide concentration contained in the flue gas in the flue gas output pipe 12. After determining that organic amine supplementation is needed, sampling is performed through the sampling port 7, and the obtained sample is tested in the laboratory, and the organic amine loading therein is determined to be a1wt.%, while the initial organic amine loading of the solid amine adsorbent is a0wt.%, the initial filling mass of the solid amine adsorbent 5 is m0, and the mass of the organic amine loss is m, then the corresponding calculation formula is: m=(a0-a1)m0 / (100-a1). The pore volume V0 of the solid amine adsorbent 5 is known, and the organic amine concentration C of the organic amine solution for impregnation can be calculated according to the pore volume V0, and the calculation formula is C=m / V0, that is, m=(a0-a1)m0 / (100-a1)V0. Therefore, the organic amine solution used has an organic amine concentration of C. The amount of the organic amine solution can be determined based on the initial mass and pore volume V0 of the solid amine adsorbent 5 , and the organic amine solution with a concentration of C is prepared in the liquid storage tank 1 .

[0022] After that, the gas pipeline is closed, and the organic amine solution is pumped into the liquid inlet reserved by the adsorption device, and the organic amine solution is sprayed onto the solid amine adsorbent 5. Since the volume of the organic amine solution is much larger than the amount of organic amine solution required for dry spray impregnation in this scheme, a certain amount of organic amine solution is always left in the liquid storage tank 1. Based on the actual amount of organic amine solution required for equal volume impregnation, the lower threshold limit of the liquid level in the liquid storage tank after the amount of organic amine solution is output can be determined. When the solution level of the amine solution storage tank is lower than the lower threshold limit of a certain liquid level, it indicates that the delivery of the organic amine solution has been completed, and the solid amine adsorbent adsorbed with the organic amine solution is maintained for a period of time and the impregnation is completed.

[0023] High-temperature flue gas that has not been heat exchanged or dry gas generated by heat exchange is introduced into the flue gas inlet on the shell 2, and the solid amine adsorbent 5 is dried in situ using the waste heat energy of the flue gas. After 24 hours, the adsorbent can normally carry out the adsorption-desorption cycle of carbon dioxide.

[0024] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the inventive concept and technical solution of the utility model, or the inventive concept and technical solution are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A fixed bed carbon dioxide adsorption device for online supplementation of organic amines, characterized in that: The invention comprises a shell (2), a partition (15), a solid amine adsorbent (5), a liquid filling pipe (10) and a nozzle (17); the partition (15) is perpendicular to the axial direction of the shell (2) and is arranged in layers in the shell (2); the solid amine adsorbent (5) is filled between the partitions (15) or is accumulated on the partitions (15); the liquid filling pipe (10) extends downward from the top of the shell (2) to the partition (15); the nozzle (17) is arranged on the partition (15); the nozzle (17) sprays an organic amine solution onto the solid amine adsorbent (5) on the corresponding partition (15); the liquid filling pipe (10) is connected to each nozzle (17); the inlet at the upper end of the liquid filling pipe (10) is connected to a liquid storage tank (1) of the organic amine solution via a solution input pipe (6); the solution input pipe (6) is connected to an input pump (3).

2. The fixed bed carbon dioxide adsorption device for online supplementation of organic amine according to claim 1, characterized in that: The partition (15) is circular and has a fan-shaped notch (19). The fan-shaped notches (19) between the upper and lower adjacent partitions (15) are staggered. An annular mounting member (16) is fixed to the inner wall of the shell (2), and the partition (15) is fixed on the annular mounting member (16).

3. The fixed bed carbon dioxide adsorption device for online supplementation of organic amine according to claim 2, characterized in that: The liquid filling pipe (10) passes through the center of the partition (15), a plurality of nozzles (17) are provided and radially arranged on the partition (15), the nozzles (17) are evenly arranged circumferentially on the partition (15), and each nozzle (17) is provided with a plurality of nozzles (18) arranged upward.

4. The fixed bed carbon dioxide adsorption device for online supplementation of organic amine according to claim 1, characterized in that: The side of the housing (2) is provided with a sampling port (20) for sampling the solid amine adsorbent (5), and the flow meter (4) is arranged on the solution input pipe (6).

5. The fixed bed carbon dioxide adsorption device for online supplementation of organic amine according to claim 1, characterized in that: The liquid storage tank (1) is provided with a liquid level detection device (8), and the liquid level detection device (8) is used to detect the liquid level height of the liquid in the liquid storage tank (1).

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