Condensation recovery system for carbon capture absorbent

Abstract

The embodiment of the invention provides a carbon capture absorbent condensation recovery system, comprising: an absorption tower provided with a flue gas inlet, a barren liquor inlet and a rich liquor outlet; the desorption tower is provided with a rich solution inlet, a barren solution outlet and a regenerated gas outlet which is formed in the top of the desorption tower and is communicated with the regenerated gas flue; the input end of the condenser is communicated with the regenerated gas outlet, and the condenser is used for cooling the flue gas into which the regenerated gas flows; the input end of the liquid storage device is communicated with the output end of the condenser, and the output end of the liquid storage device is communicated with an absorbent pool in the desorption tower; wherein the condenser cools the regeneration gas, so that volatile components of an absorbent in the regeneration gas are condensed into liquid and are separated from the regeneration gas, and the liquid volatile components of the condensed absorbent are collected in the liquid storage device.

Description

Technical Field

[0001] Embodiments of the present disclosure belong to the technical field of carbon capture equipment, and particularly relate to a carbon capture absorbent condensation recovery system. Background Art

[0002] Traditional carbon capture systems are based on chemical absorption (such as using amine solvents to capture carbon dioxide). Carbon dioxide reacts with the absorbent and then the absorbent is regenerated by means such as heating to release carbon dioxide. This results in relatively low overall energy efficiency and high operating costs. Common energy consumption peaks occur during the absorbent regeneration stage, so improving the energy efficiency of this process is particularly important.

[0003] Moreover, the absorbent of the traditional system needs to be regenerated and replenished repeatedly, and the regeneration process usually causes gradual degradation and volatilization of the absorbent. On the one hand, the capture efficiency is reduced, and on the other hand, the volatilization of the absorbent causes waste of resources.

[0004] Therefore, how to solve the above problems has become an urgent technical problem for those skilled in the art. Summary of the Invention

[0005] Embodiments of the present disclosure aim to at least solve one of the technical problems existing in the prior art, and provide a carbon capture absorbent condensation recovery system.

[0006] One aspect of the embodiments of the present disclosure provides a carbon capture absorbent condensation recovery system, including:

[0007] An absorption tower, which is provided with a flue gas inlet, a lean liquid inlet, and a rich liquid outlet;

[0008] A desorption tower, which is provided with a rich liquid inlet, a lean liquid outlet, and a re - generated gas outlet provided at the top of the desorption tower and communicated with the re - generated gas flue;

[0009] A condenser, the input end of which is communicated with the re - generated gas outlet, and is used for cooling the flue gas flowing in from the re - generated gas;

[0010] A liquid storage tank, the input end of which is communicated with the output end of the condenser, and the output end of which is communicated with the absorbent pool in the desorption tower;

[0011] Wherein, the condenser cools the re - generated gas to condense the volatile components of the absorbent in the re - generated gas into a liquid and separates it from the re - generated gas, and the liquid volatile components of the condensed absorbent are collected in the liquid storage tank.

[0012] Optionally, the condenser includes an air - cooled condenser.

[0013] Optionally, the liquid storage device has a liquid inlet communicating with the output end of the condenser, and an overflow port communicating with the absorbent pool in the desorption tower through a pipeline.

[0014] Furthermore, it further includes: a lean liquid pump, which is arranged in the lean liquid pipeline between the lean liquid inlet and the lean liquid outlet.

[0015] Furthermore, it further includes: a rich liquid pump, which is arranged in the rich liquid pipeline between the rich liquid outlet and the rich liquid inlet.

[0016] Furthermore, it further includes: a reboiler, which is arranged in the desorption tower and is used to heat the rich liquid in the desorption tower.

[0017] Furthermore, it further includes: a heat exchanger, which is respectively connected to the lean liquid pipeline and the rich liquid pipeline, and the heat exchanger is used for heat exchange between the lean liquid and the rich liquid in the lean liquid pipeline and the rich liquid pipeline.

[0018] Furthermore, it further includes: a cooler, which is arranged in the lean liquid pipeline and is arranged downstream of the lean liquid pump.

[0019] Optionally, in the direction from the bottom to the top of the absorption tower, the rich liquid outlet, the flue gas inlet, and the lean liquid inlet are sequentially arranged at intervals.

[0020] Optionally, in the direction from the bottom to the top of the desorption tower, the lean liquid outlet, the rich liquid inlet, and the regeneration gas outlet are sequentially arranged at intervals.

[0021] The beneficial effects of the embodiments of the present disclosure include:

[0022] In the present invention, the regeneration gas is cooled by the condenser, and the volatile components of the absorbent in the regeneration gas are liquefied and then flow into the liquid storage device, realizing the closed-loop recovery of the absorbent, reducing the degradation and volatilization loss of the absorbent, reducing resource waste, reducing the replenishment frequency of the absorbent, and improving energy efficiency. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a carbon capture absorbent condensation recovery system according to an embodiment of the present disclosure.

[0024] In the figure, 1. Absorption tower; 2. Desorption tower; 3. Lean liquid pump; 4. Lean liquid pipeline; 5. Rich liquid pump; 6. Rich liquid pipeline; 7. Reboiler; 8. Condenser; 9. Liquid storage device; 10. Heat exchanger; 11. Cooler; 12. Flue gas inlet. Detailed Embodiments

[0025] To enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] The following further describes the embodiments of the present application in detail in conjunction with the accompanying drawings and examples. The detailed descriptions and drawings of the following examples are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that unless otherwise stated, the meaning of "a plurality" is two or more; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0027] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0028] The carbon capture absorbent condensation recovery system of the present invention aims at traditional carbon capture organic amine solvents. In the solvent system, processes such as regeneration mainly rely on high-temperature steam. The absorbent components in the regenerated gas of the regeneration tower are not fully utilized, resulting in energy waste, high operating costs, and low overall emission reduction efficiency.

[0029] As Figure 1 shown, a carbon capture absorbent condensation recovery system includes: an absorption tower 1, a desorption tower 2, a condenser 8, and a liquid storage tank 9. The absorption tower 1 is provided with a flue gas inlet, a lean liquid inlet, and a rich liquid outlet. The desorption tower 2 is provided with a rich liquid inlet, a lean liquid outlet, and a regenerated gas outlet provided at the top of the desorption tower 2 and communicated with the regenerated gas flue.

[0030] The input end of the condenser 8 is communicated with the regenerated gas outlet, and is used to cool the flue gas flowing in from the regenerated gas. The input end of the liquid storage tank 9 is communicated with the output end of the condenser 8, and the output end of the liquid storage tank 9 is communicated with the absorbent pool in the desorption tower 2.

[0031] Among them, the condenser 8 cools the regeneration gas to condense the volatile components of the absorbent in the regeneration gas into a liquid and separates it from the regeneration gas, and the liquid volatile components of the condensed absorbent are collected in the liquid storage tank 9.

[0032] In the present invention, the regeneration gas is cooled by the condenser 8, so that the volatile components of the absorbent in the regeneration gas are liquefied and flow into the liquid storage tank 9, realizing the closed-loop recovery of the absorbent, reducing the degradation and volatile loss of the absorbent, reducing resource waste, reducing the replenishment frequency of the absorbent, and improving energy efficiency.

[0033] In some embodiments, the absorbent is an amine solvent. By cooling the regeneration gas in the present invention, the volatile components in the absorbent can be condensed and separated from the flue gas. The amine solvent is prone to volatile loss after heating and regeneration, and cooling the gas temperature helps to recover part of the solvent. This process is optimized to condense the solvent or absorbent into a liquid and then recycle and reuse it.

[0034] In some embodiments, the condenser 8 includes an air-cooled condenser.

[0035] In the present invention, the condenser 8 adopts an air-cooled condenser, which can adapt to water-scarce scenarios and does not require the energy consumption of a circulating water system.

[0036] In some embodiments, the liquid storage tank 9 has a liquid inlet communicating with the output end of the condenser 8, and an overflow port communicating with the absorbent pool in the desorption tower 2 through a pipeline.

[0037] In the present invention, the liquid component of the volatile absorbent collected can be refluxed into the absorbent pool in the desorption tower 2 through the overflow port of the liquid storage tank 9 to supplement the absorbent, thereby effectively reducing the loss of the absorbent and reducing the replenishment frequency of the absorbent.

[0038] In some embodiments, the system further includes a lean liquid pump 3, and the lean liquid pump 3 is arranged on the lean liquid pipeline 4 between the lean liquid inlet and the lean liquid outlet.

[0039] In the present invention, the lean liquid pump 4 transports the high-temperature lean liquid in the desorption tower 2 to the absorption tower 1 through the heat exchanger 5, and the high-temperature lean liquid exchanges heat with the rich liquid in the heat exchanger 5 to preheat the rich liquid. When the system load changes, the lean liquid pump 4 can dynamically adjust the flow rate to adjust the liquid level in the desorption tower 2.

[0040] In some embodiments, the system further includes a rich liquid pump 5, and the rich liquid pump 5 is arranged on the rich liquid pipeline 6 between the rich liquid outlet and the rich liquid inlet.

[0041] In the present invention, the rich liquid pump 5 pressurizes and transports the rich liquid to the desorption tower 2 to ensure uniform distribution of the rich liquid in the desorption tower 2. The rich liquid enters the desorption tower 2 after being preheated by the heat exchanger 5, so that the reboiler 8 only needs to supplement a small amount of heat energy, thereby reducing the comprehensive energy consumption.

[0042] In some embodiments, the system further includes a heat exchanger 10, which is respectively connected to the lean liquid pipeline 4 and the rich liquid pipeline 6, and the heat exchanger 10 is used for heat exchange between the lean liquid and the rich liquid in the lean liquid pipeline 4 and the rich liquid pipeline 6.

[0043] In the present invention, the waste heat of the rich liquid is used to preheat the lean liquid through the heat exchanger 10, thereby reducing the heating load of the reboiler 7. The heating energy required for the preheated lean liquid is reduced, the overall energy consumption of the system is reduced, and the energy utilization efficiency is significantly improved. In addition, through heat exchange, the temperatures of the lean liquid and the rich liquid are closer to the process required range, which helps to maintain the stable operating conditions of the absorption tower 1 and the desorption tower 2.

[0044] In some embodiments, the system further includes a cooler 11, which is arranged in the lean liquid pipeline 4 and downstream of the lean liquid pump 3.

[0045] In the present invention, the lean liquid is cooled by the cooler 11 to ensure the best absorption state of the lean liquid. In addition, the cooler 11 reduces the temperature fluctuation of the lean liquid, ensures the stable operation of the absorption tower 1, and improves the overall controllability of the system.

[0046] In some embodiments, in the direction from the bottom to the top of the absorption tower 1, the rich liquid outlet, the flue gas inlet 12 and the lean liquid inlet are sequentially arranged at intervals.

[0047] In some embodiments, in the direction from the bottom to the top of the desorption tower 2, the lean liquid outlet, the rich liquid inlet and the regenerated gas outlet are sequentially arranged at intervals.

[0048] In some embodiments, the system further includes a reboiler 7, which is arranged in the desorption tower 2 and is used for heating the rich liquid in the desorption tower 2.

[0049] In some embodiments, the reboiler 7 is arranged at the bottom of the desorption tower 2.

[0050] In the present invention, the basic principle of condensation recovery is to utilize the thermodynamic principle to reduce the temperature of the flue gas so that the volatile substances (such as absorbent) in the gas are condensed into liquid. The specific principle is as follows:

[0051] I. Gas cooling:

[0052] The escaping flue gas is cooled by an air-cooled condenser. The air-cooled condenser uses air as the cooling medium and reduces the temperature of the waste gas through radiators and fans. It can be applied to application scenarios such as high-temperature waste gas such as water vapor in the regeneration tower and limited cooling water resources.

[0053] II. Condensation process:

[0054] During the cooling process, the volatile absorbent in the gas begins to condense into a liquid, causing the absorbent to be condensed out.

[0055] III. Separation and Recovery:

[0056] The condensed liquid absorbent flows back to the liquid storage tank through a pipeline and is collected. When it reaches a certain liquid level, it can directly return to the absorbent pool in the desorption tower through the overflow port and be reused.

[0057] A technology for recovering the volatile absorbent by reducing the temperature of the gas to cause the volatile absorbent component to re-condense into a liquid. This process utilizes the relationship between the temperature of the gas and the boiling point of the absorbent. By reducing the temperature of the flue gas, the volatile substances cause the solvent or absorbent to condense into a liquid, and then it is collected and reused. Thus, the reuse of the carbon dioxide absorbent is optimized, the overall efficiency of the carbon capture system is improved, and the overall operating cost of the system is reduced.

[0058] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present disclosure. However, the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also regarded as the protection scope of the present disclosure.

Claims

1. A carbon capture absorbent condensation recovery system, characterized in that, Comprising: An absorption tower provided with a flue gas inlet, a lean liquid inlet, and a rich liquid outlet; A desorption tower provided with a rich liquid inlet, a lean liquid outlet, and a re - generated gas outlet disposed at the top of the desorption tower and communicating with the re - generated gas flue; A condenser, the input end of which communicates with the re - generated gas outlet, for cooling the flue gas flowing in from the re - generated gas; A liquid storage tank, the input end of which communicates with the output end of the condenser, and the output end of which communicates with the absorbent pool in the desorption tower; Wherein, the condenser cools the re - generated gas to condense the volatile components of the absorbent in the re - generated gas into a liquid and separates it from the re - generated gas, and the liquid volatile components of the condensed absorbent are collected in the liquid storage tank.

2. The carbon capture absorbent condensation recovery system according to claim 1, wherein, The condenser includes an air - cooled condenser.

3. The carbon capture absorbent condensation recovery system according to claim 1, wherein The liquid storage tank has a liquid inlet communicating with the output end of the condenser and an overflow port communicating with the absorbent pool in the desorption tower through a pipeline.

4. The carbon capture absorbent condensation recovery system according to claim 1, characterized in that, Further comprising: A lean liquid pump disposed in the lean liquid pipeline between the lean liquid inlet and the lean liquid outlet.

5. The carbon capture absorbent condensation recovery system according to claim 4, wherein Further comprising: A rich liquid pump disposed in the rich liquid pipeline between the rich liquid outlet and the rich liquid inlet.

6. The carbon capture absorbent condensation recovery system according to claim 1, characterized in that, Further comprising: A reboiler disposed in the desorption tower for heating the rich liquid in the desorption tower.

7. The carbon capture absorbent condensation recovery system according to claim 5, wherein Further comprising: A heat exchanger respectively connected to the lean liquid pipeline and the rich liquid pipeline, and the heat exchanger is used for heat exchange between the lean liquid and the rich liquid in the lean liquid pipeline and the rich liquid pipeline.

8. The carbon capture absorbent condensation recovery system according to claim 4, wherein Further comprising: A cooler disposed in the lean liquid pipeline and arranged downstream of the lean liquid pump.

9. The carbon capture absorbent condensation recovery system according to claim 1, wherein, In the direction from the bottom to the top of the absorption tower, the rich liquid outlet, the flue gas inlet, and the lean liquid inlet are sequentially arranged at intervals.

10. The carbon capture absorbent condensation recovery system according to claim 1, wherein In the direction from the bottom to the top of the desorption tower, the lean liquid outlet, the rich liquid inlet, and the re - generated gas outlet are sequentially arranged at intervals.

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