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 carbon dioxide adsorption device capable of supplementing organic amine on line, which comprises a shell, a bottom partition plate, a solid amine adsorbent, a liquid filling pipe and a spray pipe, the solid amine adsorbent is stacked on the horizontally arranged bottom partition plate, and a vertical axial spiral blade is arranged on the bottom partition plate. The spiral blade separates the solid amine adsorbent to form a spiral flow channel, the liquid filling pipe penetrates through the center of the spiral blade, the spray pipes are evenly arranged along the upper surface of the spiral blade, the spray pipes spray an organic amine solution to the solid amine adsorbent, the liquid filling pipe is communicated with all the spray pipes, and an inlet in the upper end of the liquid filling pipe is communicated with a liquid storage tank of the organic amine solution through a solution input pipe. And the solution input pipe is connected with an input pump. According to the utility model, the flow length of carbon dioxide gas passing through the solid amine adsorbent can be increased under the condition that the volume is limited, the solid amine adsorbent can be continuously impregnated in the adsorption device, regeneration equipment does not need to be additionally purchased, excessive impregnation liquid does not need to be used, and the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of carbon dioxide capture, and in particular relates to a 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] In the commonly used carbon dioxide adsorption device, solid amine adsorbent is filled or piled on the partition therein to form an adsorption area. However, this method causes the length of the carbon dioxide adsorption device to directly affect the length of the process of carbon dioxide passing through the adsorption area. When the length of the carbon dioxide adsorption device is limited by the layout space, how to increase the length of the process of carbon dioxide passing through becomes a problem that needs to be solved. On the other hand, the organic amine supported by the substrate in the solid amine adsorbent as an active component will be continuously lost during the adsorption process. The current existing technology basically takes out and replaces the old solid amine adsorbent, and then uses a special adsorbent regeneration equipment to supplement the organic amine to the old adsorbent. This process of taking out, replacing and regenerating is not only relatively complicated and will interfere with the operation of the system, but may also cause damage to the equipment and adsorbent during the replacement process, and significantly increase the equipment cost. Utility Model Content

[0004] The utility model aims to provide a carbon dioxide adsorption device for online supplementation of organic amines, which is used to solve the technical problems in the prior art that the process length of the adsorption process is affected by the length of the device, and the replacement and regeneration of the solid amine adsorbent is complicated and requires additional equipment costs.

[0005] The carbon dioxide adsorption device for online supplementation of organic amines comprises a shell, a bottom baffle, a solid amine adsorbent, a liquid filling pipe and a nozzle. The solid amine adsorbent is accumulated on the horizontally arranged bottom baffle. The bottom baffle is provided with vertical axial spiral blades. The spiral blades separate the solid amine adsorbent to form a spiral flow channel. The liquid filling pipe passes through the center of the spiral blades. The nozzles are evenly arranged along the upper surfaces of the spiral blades. The nozzles spray organic amine solution onto the solid amine adsorbent. The liquid filling pipe is connected to each nozzle. 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. The solution input pipe is connected to an input pump.

[0006] Preferably, the outer edge of the spiral blade is fitted and fixed to the inner wall of the cylindrical shell, and the inner edge of the spiral blade is fitted to the outer wall of the liquid filling tube.

[0007] Preferably, the nozzles are radially arranged around the liquid filling tube and are evenly arranged along the spiral extension direction of the upper surface of the spiral blade. Each nozzle is provided with a plurality of upwardly arranged nozzles, and the nozzles are evenly arranged along the setting direction of the nozzles.

[0008] Preferably, a sampling port that can communicate with the spiral flow channel is provided on the side of the shell, and the sampling port is used to sample the solid amine adsorbent. The flow meter is arranged 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] Preferably, the top of the housing is also connected to a smoke output pipe and a desorption gas input pipe, and the bottom of the housing is provided with a smoke input pipe and a desorption gas output pipe. The smoke output pipe is provided with a gas analyzer for analyzing the carbon dioxide concentration.

[0011] The utility model has the following advantages: the utility model absorbs carbon dioxide through solid amine adsorbent, supports it through the bottom partition to prevent it from falling, and separates it through spiral blades to form a spiral flow channel. Therefore, this solution can increase the flow length of carbon dioxide gas passing through the solid amine adsorbent without changing the shell length and the amount of solid amine adsorbent, and can produce a better adsorption effect when space is limited.

[0012] At the same time, the present invention utilizes a plurality of nozzles and nozzles arranged on the spiral blades to evenly spray the organic amine solution on the solid amine adsorbent in the device, which enables the present invention to achieve organic amine replenishment of the old solid amine adsorbent in the system, and because the replenishment effect is relatively uniform, the spraying flow rate of the organic amine solution can be controlled to achieve dry spray impregnation, which is an equal volume impregnation method, and can effectively reduce the amount of organic amine solution used and avoid pulverization of the solid amine adsorbent.

[0013] After the organic amine, the active component for adsorbing carbon dioxide, is lost, the adsorption device in this 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 method of continuously spraying the solid amine adsorbent with the organic amine solution. Compared with the excessive impregnation method, the amount of organic amine solution used is greatly reduced, and the solid amine adsorbent is not easy to pulverize. Therefore, this 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 used and the loss of solid amine adsorbent. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a structural schematic diagram of a carbon dioxide adsorption device for online supplementation of organic amines.

[0015] Figure 2 for Figure 1 A schematic diagram of the structure of the spiral blade structure inside the shell in the structure shown.

[0016] Figure 3 for Figure 2 Top view of the structure shown.

[0017] 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, bottom partition, 16, spiral blade, 17, nozzle, 18, nozzle. DETAILED DESCRIPTION

[0018] 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.

[0019] like Figure 1-Figure 3As shown, the utility model provides a carbon dioxide adsorption device for online supplementation of organic amines, comprising a shell 2, a bottom baffle 15, a solid amine adsorbent 5, a liquid filling pipe 10 and a nozzle 17, the solid amine adsorbent 5 is accumulated on the horizontally arranged bottom baffle 15, the bottom baffle 15 is provided with a vertical axial spiral blade 16, the spiral blade 16 separates the solid amine adsorbent 5 to form a spiral flow channel, the liquid filling pipe 10 passes through the center of the spiral blade 16, the nozzle 17 is evenly arranged along the upper surface of the spiral blade 16, the nozzle 17 sprays the organic amine solution to the solid amine adsorbent 5, each nozzle 17 is connected to the liquid filling pipe 10, 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.

[0020] The above-mentioned adsorption device inputs organic amine solution from the external organic amine solution storage tank 1, and the spiral blade 16 separates the solid amine adsorbent 5 up and down to form a corresponding spiral flow channel. The spiral flow channel can increase the flow length of the gas in the adsorption area of ​​the device without changing the length of the shell 2. The bottom partition 15 seals the opening below the spiral flow channel to prevent the solid amine adsorbent 5 from falling and escaping from the spiral flow channel. At the same time, the nozzle 17 arranged by the spiral blade 16 can also achieve a relatively uniform organic amine supplement to the solid amine adsorbent 5 in the shell 2. Since the spraying and supplementing of organic amine is relatively uniform, it is possible to use continuous spraying of organic amine solution for dry spray impregnation. This method belongs to a kind of equal volume impregnation, which can greatly reduce the amount of organic amine solution used, and the solid amine adsorbent 5 is not easy to pulverize.

[0021] 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 one 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 alternating operation of carbon dioxide adsorption and desorption with other adsorption devices of the same structure.

[0022] The outer edge of the spiral blade 16 is fixedly attached to the inner wall of the cylindrical shell 2, and the inner edge of the spiral blade 16 is attached to the outer wall of the liquid filling tube 10. The side of the shell 2 is provided with a sampling port 7 that can be connected to the spiral flow channel, and the sampling port 7 is used to sample the solid amine adsorbent 5. The flow meter 4 is arranged on the solution input pipe 6 to detect the flow rate of the input organic amine solution. Since this solution 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 and overflow of the organic amine solution.

[0023] The nozzles 17 are radially arranged around the liquid filling pipe 10 and are evenly arranged along the spiral extension direction of the upper surface of the spiral blade 16. Each nozzle 17 is provided with a plurality of nozzles 18 arranged upward, and the nozzles 18 are evenly arranged along the arrangement direction of the nozzles 17. In this way, the organic amine solution sprayed by the nozzles 18 in this solution can be evenly sprayed into the solid amine adsorbent 5 at various locations in the spiral flow channel.

[0024] 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.

[0025] 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.

[0026] 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 .

[0027] 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.

[0028] 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.

[0029] 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 carbon dioxide adsorption device for online supplementation of organic amines, characterized in that: The invention comprises a shell (2), a bottom baffle (15), a solid amine adsorbent (5), a liquid filling pipe (10) and a nozzle (17). The solid amine adsorbent (5) is accumulated on the bottom baffle (15) which is arranged horizontally. The bottom baffle (15) is provided with a vertical axial spiral blade (16). The spiral blade (16) separates the solid amine adsorbent (5) to form a spiral flow channel. The liquid filling pipe (10) passes through the center of the spiral blade (16). The nozzle (17) is evenly arranged along the upper surface of the spiral blade (16). The nozzle (17) sprays an organic amine solution onto the solid amine adsorbent (5). 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 through a solution input pipe (6). The solution input pipe (6) is connected to an input pump (3).

2. The carbon dioxide adsorption device for online supplementation of organic amine according to claim 1, characterized in that: The outer edge of the spiral blade (16) is fitted and fixed to the inner wall of the cylindrical shell (2), and the inner edge of the spiral blade (16) is fitted to the outer wall of the liquid filling tube (10).

3. The carbon dioxide adsorption device for online supplementation of organic amines according to claim 2, characterized in that: The nozzles (17) are radially arranged around the liquid filling pipe (10) and are evenly arranged along the spiral extension direction of the upper surface of the spiral blade (16). Each nozzle (17) is provided with a plurality of nozzles (18) arranged upward, and the nozzles (18) are evenly arranged along the setting direction of the nozzles (17).

4. The carbon dioxide adsorption device for online supplementation of organic amine according to claim 1, characterized in that: A sampling port (7) capable of communicating with the spiral flow channel is provided on the side of the shell (2). The sampling port (7) is used to sample the solid amine adsorbent (5). The flow meter (4) is provided on the solution input pipe (6).

5. The 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).

6. The carbon dioxide adsorption device for online supplementation of organic amine according to claim 1, characterized in that: The top of the shell (2) is also connected to a smoke output pipe (12) and a desorption gas input pipe (13), the bottom of the shell (2) is provided with a smoke input pipe (11) and a desorption gas output pipe (14), and the smoke output pipe (12) is provided with a gas analyzer (9) for analyzing the carbon dioxide concentration.

Images