Amine escape control system and method for carbon capture device
By introducing a combined system of acid washing and water washing sections into the carbon capture device, along with a gas replenishment tank and a heat exchanger, the problem of organic amine escape was solved, and the effective removal of organic amines from flue gas was achieved, reducing environmental and economic costs.
Patent Information
- Application Number
- CN202610029050.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-09
- Publication Date
- 2026-03-27
AI Technical Summary
In existing technologies, the organic amine chemical absorption method suffers from amine escape during CO2 capture, leading to environmental pollution, increased economic costs, and health hazards.
The carbon capture device employs an amine escape control system consisting of an acid washing section and a water washing section. Through primary acid washing and secondary water washing, combined with a gas replenishment tank and a heat exchanger, the flue gas is circulated for acid washing and water washing, thereby reducing the content of gaseous organic amines.
It effectively reduces the volatility of organic amines in flue gas, reduces environmental pollution and economic costs, and improves the control of amine escape.
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Figure CN121731928A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of amine escape control, and in particular to an amine escape control system and method for a carbon capture device. BACKGROUND
[0002] Currently, the organic amine chemical absorption method is widely used in carbon dioxide (CO2) capture technology. Organic amines (such as ethanolamine MEA, ethylenediamine EDA, 2-amino-2-methyl-1-propanol AMP) can chemically react with CO2 to form stable amine acid salts. However, due to the volatility of amines, when using the organic amine chemical absorption method for CO2 capture, the problem of amine escape may occur, that is, organic amines may escape into the gas stream during the absorption of CO2, which may cause adverse effects on the environment and economy. For example, in terms of the environment, the amine escape problem may cause air pollution or potential harm to the ecological system. When organic amines escape into the atmosphere, they may have a negative impact on air quality and form volatile organic compounds (VOCs), which sometimes react with other components in the atmosphere to form harmful substances such as ozone. In addition, if organic amines enter water bodies or soil, they may also have adverse effects on aquatic organisms or soil ecosystems. In terms of economy, the amine escape problem will result in the loss of organic amines, increase the operating cost of carbon capture, and also incur additional environmental protection costs for treating related environmental pollution. In terms of health and safety, if organic amines escape into the work environment, they may pose potential hazards to the health and safety of workers. SUMMARY
[0003] The present disclosure aims to at least solve one of the problems existing in the prior art, and provides an amine escape control system and method for a carbon capture device.
[0004] In one aspect of the present disclosure, an amine escape control system for a carbon capture device is provided, which comprises: an acid washing part, an input end of which is connected to an output end of a flue gas of a carbon capture device, for cyclically acid washing the flue gas output by the carbon capture device; a water washing part, an input end of which is connected to an output end of the flue gas of the acid washing part, for water washing the flue gas output by the acid washing part.
[0005] Optionally, the acid washing part comprises a primary acid washing tower and a gas supplement tank. The flue gas input end of the primary acid washing tower is connected with the flue gas output end of the carbon capture device, the flue gas output end of the primary acid washing tower is connected with the flue gas input end of the water washing part, and the liquid output end of the primary acid washing tower is connected with the liquid input end of the gas supplement tank; the liquid output end of the gas supplement tank is connected with the liquid input end of the primary acid washing tower; and the gas input end of the gas supplement tank is used for inputting carbon dioxide into the gas supplement tank. The primary acid washing tower is used for performing circulating water washing on the flue gas output by the carbon capture device, outputting the water washed flue gas to the water washing part, and outputting the liquid generated by water washing to the gas supplement tank. The gas supplement tank is used for enabling carbon dioxide to chemically react with the organic amine carried by the liquid output by the primary acid washing tower, performing acid washing on the liquid output by the primary acid washing tower, and returning the liquid generated by acid washing to the primary acid washing tower.
[0006] Optionally, the gas output end of the gas supplement tank is connected with the gas input end of the gas supplement tank, so as to recycle the gas output by the gas supplement tank.
[0007] Optionally, the gas input end of the gas supplement tank is located at the bottom of the gas supplement tank, the liquid input end of the gas supplement tank is located at the top of the gas supplement tank, and the liquid output end of the gas supplement tank is located at the bottom of the gas supplement tank.
[0008] Optionally, the acid washing part further comprises an acid washing heat exchanger, the input end of the acid washing heat exchanger is connected with the liquid output end of the primary acid washing tower, the output end of the acid washing heat exchanger is connected with the liquid input end of the gas supplement tank, and the acid washing heat exchanger is used for cooling the liquid output by the primary acid washing tower and inputting the cooled liquid into the gas supplement tank.
[0009] Optionally, the acid washing part further comprises a pressurizing pump, the input end of the pressurizing pump is connected with the liquid output end of the primary acid washing tower, the output end of the pressurizing pump is connected with the input end of the acid washing heat exchanger, and the pressurizing pump is used for pressurizing the liquid output by the primary acid washing tower.
[0010] Optionally, the acid washing part further comprises a shunt pump, the input end of the shunt pump is connected with the output end of the pressurizing pump, and the output end of the shunt pump is connected with the liquid input end of the carbon capture device; and the shunt pump is used for shunting the liquid output by the primary acid washing tower to the carbon capture device.
[0011] Optionally, the washing section includes a secondary washing tower and a reflux pump. The flue gas inlet of the secondary washing tower is connected to the flue gas outlet of the pickling section, and the liquid outlet of the secondary washing tower is selectively connected to the liquid inlet of the secondary washing tower and the liquid inlet of the pickling section via the reflux pump.
[0012] Optionally, the water washing section further includes a water washing heat exchanger, the input end of which is connected to the output end of the reflux pump, and the output end of which is connected to the liquid input end of the secondary water washing tower; the water washing heat exchanger is used to cool the liquid output by the reflux pump and input the cooled liquid into the secondary water washing tower.
[0013] Another aspect of this disclosure provides a method for controlling amine escape in a carbon capture device, applied to the amine escape control system of the carbon capture device described above, the control method comprising: The flue gas output from the carbon capture device is fed into the acid washing section for circulating acid washing; The flue gas output from the pickling section is fed into the water washing section for water washing.
[0014] Compared with the prior art, this disclosure utilizes an acid washing section to perform primary acid washing on the flue gas output from the carbon capture device, and a water washing section to perform secondary water washing on the flue gas. Compared with the prior art scheme that only uses primary water washing for amine escape control, this method effectively reduces the gas phase organic amine content in the flue gas while achieving flue gas cooling. Attached Figure Description
[0015] One or more embodiments are illustrated by way of example with the corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0016] Figure 1 A schematic diagram of the structure of an amine escape control system for a carbon capture device provided in one embodiment of this disclosure; Figure 2 A flowchart of an amine escape control method for a carbon capture device provided in another embodiment of this disclosure. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the various embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and with various variations and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of this disclosure. The various embodiments can be combined with and referenced by each other without contradiction.
[0018] One embodiment of this disclosure relates to an amine escape control system for a carbon capture device, such as Figure 1 As shown, it includes an acid washing section and a water washing section. The flue gas inlet of the acid washing section is connected to the flue gas outlet of the carbon capture device. The acid washing section is used to perform circulating acid washing on the flue gas output from the carbon capture device. The flue gas inlet of the water washing section is connected to the flue gas outlet of the acid washing section. The water washing section is used to perform water washing on the flue gas output from the acid washing section.
[0019] Specifically, combined Figure 1 Carbon capture devices typically utilize liquid from a pre-washing tower to pre-wash flue gas entering through a pipe interface (not shown in the diagram). The liquid output from the pre-washing tower can be pressurized by a booster pump (not shown in the diagram) and re-enter the pre-washing tower for cyclic pre-washing. Carbon capture devices also typically utilize an absorption tower to absorb CO2 from the flue gas output from the pre-washing tower using organic amines, generating rich liquor before output. The absorption tower can also receive lean liquor pressurized by a lean liquor pump. In the absorption tower, organic amines can chemically react with CO2 to form stable amine salts. Because amines are volatile, amine escape can occur when the absorption tower absorbs CO2 through organic amines. Therefore, the amine escape control system of the carbon capture device provided in this embodiment is equipped with an acid washing section and a water washing section. The acid washing section performs primary acid washing on the flue gas output from the carbon capture device, especially the absorption tower, and the water washing section performs secondary water washing on the flue gas. Compared with the prior art, which only uses primary water washing for amine escape control, this method effectively reduces the gaseous organic amine content in the flue gas while achieving flue gas cooling.
[0020] For example, such as Figure 1As shown, the pickling section includes a primary pickling tower and a gas replenishment tank. The flue gas inlet of the primary pickling tower is connected to the flue gas outlet of the carbon capture device, the flue gas outlet of the primary pickling tower is connected to the flue gas inlet of the water washing section, and the liquid outlet of the primary pickling tower is connected to the liquid inlet of the gas replenishment tank. The liquid outlet of the gas replenishment tank is connected to the liquid inlet of the primary pickling tower. The gas inlet of the gas replenishment tank is used to input carbon dioxide. The primary pickling tower is used to perform circulating water washing on the flue gas output from the carbon capture device, and outputs the water-washed flue gas to the water washing section, while outputting the liquid generated from water washing to the gas replenishment tank. The gas replenishment tank is used to allow carbon dioxide to chemically react with the organic amines carried in the liquid output from the primary pickling tower, thus pickling the liquid output from the primary pickling tower, and returning the liquid generated from pickling to the primary pickling tower.
[0021] Specifically, the pickling section can achieve primary pickling through a primary pickling tower and a gas replenishment tank. First, the primary pickling tower uses circulating water to wash the flue gas output from the carbon capture device, especially the absorption tower, to initially filter organic amines and other impurities from the flue gas, and the concentration of organic amines within the primary pickling tower is controlled cyclically. Then, the liquid produced after the primary pickling tower washes the flue gas is fed into the gas replenishment tank. In the gas replenishment tank, the organic amines in the liquid react chemically with CO2, further removing the organic amines from the liquid. Furthermore, the reaction products of organic amines and CO2 have a larger molecular weight, which can further effectively reduce the volatility of organic amines.
[0022] It should be noted that the CO2 input to the gas replenishment tank can be CO2 generated by the carbon capture device. Therefore, when the amine escape control system of the carbon capture device provided in this embodiment is actually applied, there is no need to purchase additional CO2, which effectively reduces the cost of amine escape control.
[0023] The amine escape control system for the carbon capture device provided in this embodiment can further reduce the gaseous organic amine content in the flue gas output by the carbon capture device, thereby achieving amine escape control.
[0024] For example, such as Figure 1 As shown, the gas output end of the gas replenishment tank is connected to the gas input end of the gas replenishment tank to recycle the gas output from the gas replenishment tank, avoid wasting CO2 that has not chemically reacted with organic amines, and further reduce the cost of amine escape control.
[0025] For example, such as Figure 1 As shown, the gas inlet of the gas replenishment tank is located at the bottom of the gas replenishment tank, the liquid inlet is located at the top of the gas replenishment tank, and the liquid outlet is located at the bottom of the gas replenishment tank.
[0026] Specifically, the liquid entering the top of the gas replenishment tank from the primary pickling tower can be sprayed from top to bottom within the gas replenishment tank. CO2 introduced from the bottom of the gas replenishment tank can rise from bottom to top within the tank, reacting chemically with the organic amines in the liquid sprayed from top to bottom. This allows more organic amines in the liquid to react with CO2 more fully, further reducing the organic amine content in the liquid and improving the amine escape control effect.
[0027] For example, such as Figure 1 As shown, the pickling section also includes a pickling heat exchanger. The input end of the pickling heat exchanger is connected to the liquid output end of the first-stage pickling tower, and the output end of the pickling heat exchanger is connected to the liquid input end of the gas replenishment tank. The pickling heat exchanger is used to cool the liquid output from the first-stage pickling tower, and the cooled liquid is then fed into the gas replenishment tank, thereby achieving temperature reduction.
[0028] For example, such as Figure 1 As shown, the pickling section also includes a pressure pump. The input end of the pressure pump is connected to the liquid output end of the primary pickling tower, and the output end of the pressure pump is connected to the input end of the pickling heat exchanger. The pressure pump is used to pressurize the liquid output from the primary pickling tower.
[0029] For example, such as Figure 1 As shown, the pickling section also includes a diversion pump (not shown in the figure). The input end of the diversion pump is connected to the output end of the booster pump, and the output end of the diversion pump is connected to the liquid input end of the carbon capture device. The diversion pump is used to divert the liquid output from the primary pickling tower to the carbon capture device.
[0030] Specifically, since the primary acid washing tower can also cool the flue gas, and the condensate produced during the cooling process will increase, the amine escape control system of the carbon capture device provided in this embodiment is equipped with a diversion pump in the acid washing section. The diversion pump can divert the excess liquid such as condensate produced by the primary acid washing tower to the carbon capture device, especially the absorption tower in the carbon capture device, thereby realizing the recycling of liquid and preventing the introduction of foreign impurities.
[0031] For example, such as Figure 1 As shown, the washing section includes a two-stage washing tower and a reflux pump. The flue gas inlet of the two-stage washing tower is connected to the flue gas outlet of the pickling section, and the liquid outlet of the two-stage washing tower is selectively connected to the liquid inlet of the two-stage washing tower and the liquid inlet of the pickling section via the reflux pump.
[0032] Specifically, the flue gas treated by the pickling section will enter the secondary water washing tower for secondary water washing to better control the flue gas temperature and achieve double protection for the escape control of organic amines, thereby further cooling and reducing the amine content in the flue gas.
[0033] When the liquid output end of the secondary water washing tower is connected to the liquid input end of the secondary water washing tower via a reflux pump, the liquid output from the secondary water washing tower can be re-input into the secondary water washing tower for recycling, thereby further improving the amine escape control effect and reducing the amine escape control cost.
[0034] When the liquid output end of the secondary water washing tower is connected to the liquid input end of the pickling section via a reflux pump, the excess liquid generated by the secondary water washing tower can be recycled into the pickling section, especially the primary pickling tower of the pickling section, thereby further reducing the cost of amine escape control.
[0035] For example, such as Figure 1 As shown, the washing section also includes a washing heat exchanger. The inlet of the washing heat exchanger is connected to the outlet of the reflux pump, and the outlet of the washing heat exchanger is connected to the liquid inlet of the secondary washing tower. The washing heat exchanger is used to cool the liquid output from the reflux pump, and the cooled liquid is then fed into the secondary washing tower to further reduce the temperature of the liquid entering the secondary washing tower.
[0036] Another embodiment of this disclosure relates to an amine escape control method for a carbon capture device, applied to the amine escape control system of the carbon capture device described above.
[0037] like Figure 2 As shown, the amine escape control method of the carbon capture device includes: Step S210: The flue gas output from the carbon capture device is fed into the acid washing section for circulating acid washing.
[0038] Step S220: The flue gas output from the pickling section is input into the water washing section for water washing.
[0039] The amine escape control method for carbon capture devices provided in this disclosure, compared with the prior art scheme that only uses a single-stage water washing for amine escape control, further effectively reduces the gaseous organic amine components in the flue gas while achieving flue gas cooling.
[0040] Those skilled in the art will understand that the above embodiments are specific implementations of this disclosure, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this disclosure.
Claims
1. An amine escape control system for a carbon capture device, characterized in that, The control system includes: The acid washing section has its flue gas inlet connected to the flue gas outlet of the carbon capture device, and is used to perform circulating acid washing on the flue gas output from the carbon capture device. The water washing section has its flue gas inlet connected to the flue gas outlet of the acid washing section, and is used to wash the flue gas output from the acid washing section.
2. The control system according to claim 1, characterized in that, The pickling section includes a primary pickling tower and a gas replenishment tank; The flue gas inlet of the primary acid washing tower is connected to the flue gas outlet of the carbon capture device; the flue gas outlet of the primary acid washing tower is connected to the flue gas inlet of the water washing section; the liquid outlet of the primary acid washing tower is connected to the liquid inlet of the gas replenishment tank; the liquid outlet of the gas replenishment tank is connected to the liquid inlet of the primary acid washing tower; the gas inlet of the gas replenishment tank is used to input carbon dioxide into the gas replenishment tank. The primary acid washing tower is used to circulate and wash the flue gas output from the carbon capture device, and outputs the washed flue gas to the washing section, and outputs the liquid generated by the washing to the gas replenishment tank. The gas replenishment tank is used to allow carbon dioxide to chemically react with the organic amines carried in the liquid output from the primary acid washing tower, thereby performing acid washing on the liquid output from the primary acid washing tower, and returning the liquid produced from acid washing to the primary acid washing tower.
3. The control system according to claim 2, characterized in that, The gas output terminal of the gas replenishment tank is connected to the gas input terminal of the gas replenishment tank to recycle the gas output from the gas replenishment tank.
4. The control system according to claim 2, characterized in that, The gas inlet of the gas replenishment tank is located at the bottom of the gas replenishment tank, the liquid inlet of the gas replenishment tank is located at the top of the gas replenishment tank, and the liquid outlet of the gas replenishment tank is located at the bottom of the gas replenishment tank.
5. The control system according to claim 2, characterized in that, The pickling section also includes a pickling heat exchanger. The input end of the pickling heat exchanger is connected to the liquid output end of the first-stage pickling tower, and the output end of the pickling heat exchanger is connected to the liquid input end of the gas replenishment tank. The pickling heat exchanger is used to cool the liquid output from the first-stage pickling tower and input the cooled liquid into the gas replenishment tank.
6. The control system according to claim 5, characterized in that, The pickling section also includes a pressurizing pump. The input end of the pressurizing pump is connected to the liquid output end of the primary pickling tower, and the output end of the pressurizing pump is connected to the input end of the pickling heat exchanger. The pressurizing pump is used to pressurize the liquid output from the primary pickling tower.
7. The control system according to claim 6, characterized in that, The pickling section also includes a diversion pump, the input end of which is connected to the output end of the pressurizing pump, and the output end of which is connected to the liquid input end of the carbon capture device; the diversion pump is used to divert the liquid output from the primary pickling tower to the carbon capture device.
8. The control system according to any one of claims 1 to 7, characterized in that, The washing section includes a two-stage washing tower and a reflux pump. The flue gas inlet of the two-stage washing tower is connected to the flue gas outlet of the pickling section. The liquid outlet of the two-stage washing tower is selectively connected to the liquid inlet of the two-stage washing tower and the liquid inlet of the pickling section via the reflux pump.
9. The control system according to claim 8, characterized in that, The water washing section also includes a water washing heat exchanger. The input end of the water washing heat exchanger is connected to the output end of the reflux pump, and the output end of the water washing heat exchanger is connected to the liquid input end of the secondary water washing tower. The water washing heat exchanger is used to cool the liquid output by the reflux pump and input the cooled liquid into the secondary water washing tower.
10. A method for controlling amine escape in a carbon capture device, characterized in that, The control method, applied to the amine escape control system of the carbon capture device according to any one of claims 1 to 9, comprises: The flue gas output from the carbon capture device is fed into the acid washing section for circulating acid washing; The flue gas output from the pickling section is fed into the water washing section for water washing.