Amine liquid recovery equipment

Abstract

The utility model discloses amine liquid recovery equipment which comprises a tank body and a heat exchange pipe, and the tank body is provided with a first inlet used for adding an amine-containing solution, a second inlet used for adding a reaction material, a flushing opening and an amine liquid recovery opening. And the heat exchange pipe extends into the tank body and is spaced from the bottom of the tank body. An amine-containing solution is added into the tank body through the first inlet, alkaline reactants such as soda ash or caustic soda and the like are added into the tank body through the second inlet, the alkaline reactants and thermostable salt in the amine-containing solution are subjected to an acid-base neutralization reaction, active amine bound by the thermostable salt is released, and meanwhile acid radical ions and positive ions of alkali form sodium salt or sylvite. The heating low-pressure steam is conveyed to the heat exchange pipe, the heat exchange pipe extends into the tank body, the amine liquid in the amine-containing solution is evaporated through evaporation, the evaporated gas phase recycles the amine liquid through the amine liquid recycling port, the concentration of the amine liquid obtained through evaporation is high, and the absorption effect of acid gas can be ensured.

Description

Technical Field

[0001] The present application belongs to the technical field of amine liquid recovery, and specifically relates to amine liquid recovery equipment. Background Art

[0002] The amine liquid absorption method is usually used to remove acid gases such as H2S, SO2 and CO2, especially in the rapidly developed carbon dioxide capture technology and related engineering projects in the past two years.

[0003] In the process of removing acidic gases, the amine liquid deteriorates and becomes ineffective due to various pollutants in the raw gas (acidic gases such as H2S, SO2 and CO2) or flue gas, and the chemical degradation and thermal degradation of the amine liquid itself, resulting in a decrease in the concentration of the amine liquid, which affects the absorption effect of the acidic gases. Utility Model Content

[0004] In order to solve the technical problem in the related art that amine liquid deteriorates and becomes ineffective, the concentration of amine liquid decreases, and the absorption effect of acid gas is affected, the present application provides an amine liquid recovery device.

[0005] The present application provides an amine liquid recovery device, the amine liquid recovery device comprising:

[0006] The tank body is provided with a first inlet for adding an amine solution, a second inlet for adding a reaction material, a flushing port and an amine solution recovery port;

[0007] The heat exchange tube extends into the tank body and is spaced apart from the bottom of the tank body.

[0008] In some embodiments, the bottom of the tank body is recessed downward to form a pollutant accumulation groove, and the flushing port is connected to the bottom of the pollutant accumulation groove.

[0009] In some embodiments, the amine solution recovery device further comprises:

[0010] A water spray pipe is connected to the inner wall of the tank body and is located between the heat exchange pipe and the tank bottom of the tank body, and a nozzle of the water spray pipe faces the tank bottom of the tank body.

[0011] In some embodiments, the water spraying range of the water spraying pipe covers the bottom of the tank body.

[0012] In some embodiments, the amine liquid recovery port is located in the middle of the top of the tank body.

[0013] In some embodiments, the first inlet is disposed on a side wall of the tank body and is spaced apart from a tank bottom of the tank body.

[0014] In some embodiments, the heat exchange tube includes a heat exchange section, a heat exchange inlet section having a heat exchange inlet, and a heat exchange outlet section having a heat exchange outlet, and the heat exchange inlet section and the heat exchange outlet section are respectively connected to two ends of the heat exchange section;

[0015] Wherein, the heat exchange section is located in the tank body, and the heat exchange inlet section and the heat exchange outlet section are respectively penetrated through the side wall of the tank body and extend to the outside of the tank body.

[0016] In some embodiments, the heat exchange tube is U-shaped, and the two straight tube sections of the U-shaped heat exchange tube serve as the heat exchange inlet section and the heat exchange outlet section respectively, and the bent section of the U-shaped heat exchange tube serves as the heat exchange section and is located inside the tank body.

[0017] In some embodiments, at least two heat exchange tubes are provided, and the bending sections of the two heat exchange tubes are arranged at intervals.

[0018] In some embodiments, the heat exchange tube includes a heat exchange section, a heat exchange inlet section having a heat exchange inlet, and a heat exchange outlet section having a heat exchange outlet. The heat exchange tube passes through the tank body, and the heat exchange inlet section and the heat exchange outlet section are arranged on the side wall of the tank body and extend to the outside of the tank body respectively.

[0019] According to the amine liquid recovery equipment provided by one or more embodiments of the present application, the amine liquid recovery equipment includes a tank body and a heat exchange tube, and the tank body is provided with a first inlet for adding an amine-containing solution, a second inlet for adding a reaction material, a flushing port, and an amine liquid recovery port. The heat exchange tube extends into the tank body and is spaced apart from the bottom of the tank body. The amine-containing solution is added to the tank body through the first inlet, and alkaline reactants such as soda ash or caustic soda are added to the tank body through the second inlet. The alkaline reactants react with the heat-stable salts in the amine-containing solution (the cations of the heat-stable salts are amines, and the anions are organic acid radicals or inorganic acid radicals) to undergo an acid-base neutralization reaction, and the active amines bound by the heat-stable salts are released. At the same time, the acid radical ions and the cations of the base form sodium salts or potassium salts, which prevent the heat-stable salts from causing corrosion, blockage, and foaming of the acid gas absorption system, thereby improving the stability of the acid gas absorption system. The heated low-pressure steam is transported to the heat exchange tube, which extends into the tank body. The amine liquid in the amine-containing solution is evaporated by evaporation, and the evaporated gas phase recovers the amine liquid through the amine liquid recovery port. The amine liquid obtained by evaporation has a high concentration, which can ensure the absorption effect of the acid gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an amine liquid recovery device (including two groups of heat exchange tubes) in one or more embodiments of the present application;

[0021] Figure 2 It is a schematic diagram of the structure of an amine liquid recovery device (including a group of heat exchange tubes) in one or more embodiments of the present application.

[0022] Description of reference numerals:

[0023] 10. Tank body; 11. First inlet; 12. Second inlet; 13. Flushing port; 14. Amine liquid recovery port; 15. Pollutant collection tank; 16. Desalted water injection port;

[0024] 20. Heat exchange tube; 21. Heat exchange inlet; 22. Heat exchange outlet; 30. Water spray pipe; 50. Temperature sensor; 61. Upper opening of local liquid level gauge; 62. Lower opening of local liquid level gauge; 71. Upper opening of remote liquid level gauge; 72. Lower opening of local liquid level gauge. DETAILED DESCRIPTION

[0025] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0026] The amine liquid absorption method is usually used to remove acid gases such as H2S, SO2 and CO2, especially in the rapidly developed carbon dioxide capture technology and related engineering projects in the past two years.

[0027] In the related art, during the process of removing acidic gases with amine liquid, various pollutants in the raw gas (acidic gases such as H2S, SO2 and CO2) or flue gas, and the chemical degradation and thermal degradation of the amine liquid itself form an amine solution. The amine solution includes high-boiling point and non-volatile impurities, such as thermally stable salts, organic acids, solids and iron ions, which cause the amine liquid to deteriorate and become ineffective, and the concentration of the amine liquid decreases, affecting the absorption effect of the acidic gas.

[0028] In order to solve the technical problem in the related art that the amine solution deteriorates and becomes ineffective, the amine solution concentration decreases, and the absorption effect of the acid gas is affected, the present application provides an amine solution recovery device. Figure 1 The amine liquid recovery device includes a tank body 10 and a heat exchange tube 20. The tank body 10 is provided with a first inlet 11 for adding an amine solution, a second inlet 12 for adding a reaction material, a flushing port 13 at the bottom of the tank body 10, and an amine liquid recovery port 14 at the top of the tank body 10. The heat exchange tube 20 extends into the tank body 10 and is spaced apart from the bottom of the tank body 10.

[0029] An amine-containing solution is added to the tank body 10 through the first inlet 11, and an alkaline reactant such as soda ash or caustic soda is added to the tank body 10 through the second inlet 12. The alkaline reactant and the heat-stable salt (the cation of the heat-stable salt is amine, and the anion is an organic acid radical or an inorganic acid radical) in the amine-containing solution undergo an acid-base neutralization reaction to release the active amine bound by the heat-stable salt. At the same time, the acid radical ions and the cations of the base form sodium salts or potassium salts to prevent the heat-stable salts from causing corrosion, blockage and foaming of the acid gas absorption system, thereby improving the stability of the acid gas absorption system.

[0030] The heated low-pressure steam is transported to the heat exchange tube 20, which extends into the tank body 10, and the amine liquid in the amine-containing solution is evaporated by evaporation, and the evaporated gas phase recovers the amine liquid through the amine liquid recovery port 14. The amine liquid obtained by evaporation has a high concentration, which can ensure the absorption effect of the acid gas. The amine liquid recovery port 14 is located in the middle of the top of the tank body 10, which can largely take into account the collection of the evaporated amine liquid at various places in the tank body 10 and discharge it from the amine liquid recovery port 14.

[0031] It should be noted that the present application does not limit the type of alkaline reactant, which can be set according to actual needs.

[0032] In some embodiments, the tank body 10 is a horizontal tank. In other embodiments, the tank body 10 may also be a vertical tank, which can be set according to actual needs and is not limited in this application.

[0033] As the amine liquid and water evaporate in the tank body 10, the concentration of pollutants (sodium salt, potassium salt, solid and iron ions, etc.) in the amine solution increases, and the boiling point of the amine solution increases with the increase in the concentration of pollutants. Therefore, the evaporation temperature of the amine liquid in the tank body 10 can be controlled to evaporate the amine liquid and recover the high-concentration amine liquid through the amine liquid recovery port 14, while the high-boiling-point pollutants can be concentrated in the liquid residual phase and converge to the bottom of the tank body 10, and the liquid residual phase is discharged through the flushing port 13, thereby realizing the separation of the pollutants and the amine liquid and the collection of the pollutants.

[0034] In order to more accurately control the evaporation temperature in the tank body 10, a temperature sensor 50 is provided below the liquid level in the tank body 10. The temperature sensor 50 is used to measure the evaporation temperature in the tank body 10, thereby facilitating the control of the evaporation of the amine liquid in the tank body 10 and preventing the evaporation of pollutants in the residual liquid phase at the bottom of the tank, thereby improving the purity of the amine liquid and further improving the concentration of the recovered amine liquid.

[0035] See also Figure 1The heat exchange tube 20 is spaced apart from the bottom of the tank body 10, which can increase the storage space of the liquid residual phase gathered at the bottom of the tank body 10 and improve the practicality of the tank body 10. In order to facilitate the collection and discharge of the liquid residual phase, the bottom of the tank body 10 is recessed downward so that the bottom of the tank body 10 slopes toward the ground to form a pollutant gathering groove 15. The flushing port 13 is connected to the bottom of the pollutant gathering groove 15. The pollutant gathering groove 15 facilitates the accumulation of the liquid residual phase (including pollutants), the accumulation and discharge of pollutants, and at the same time, it can expand the storage space of the liquid residual phase, increase the capacity of the tank body 10 for processing the amine-containing solution, and improve the amine liquid recovery efficiency of the amine liquid recovery device.

[0036] In order to facilitate the discharge of pollutants accumulated in the pollutant collection tank 15, the amine liquid recovery equipment also includes a water spray pipe 30, which is connected to the inner wall of the tank body 10 and is located between the heat exchange tube 20 and the tank bottom of the tank body 10. The nozzle of the water spray pipe 30 faces the tank bottom of the tank body 10. The water spray pipe 30 is used to inject dilution water and hot water into the tank body 10 to dilute the pollutants in the liquid residual phase. At the same time, the impact force of water is used to facilitate the discharge of the liquid residual phase (including the viscous sludge at the bottom of the tank) through the flushing port 13, thereby improving the convenience of discharge of the liquid residual phase. The water spray range of the water spray pipe 30 covers the tank of the tank body 10, so that the liquid residual phase accumulated at the bottom of the tank body 10 can be completely discharged from the tank body 10 through the flushing port 13.

[0037] In order to improve the convenience of adding the amine-containing solution, the first inlet 11 can be arranged on the side wall of the tank body 10. The amine-containing solution can be transported from the side wall of the tank body 10 into the tank body 10, thereby reducing the addition height of the amine-containing solution and improving the convenience of adding the amine-containing solution. At the same time, the first inlet 11 is spaced apart from the bottom of the tank body 10 to ensure storage space for the amine-containing solution and the reaction materials, thereby ensuring the processing capacity of the amine-containing solution and improving the processing efficiency of the amine-containing solution.

[0038] In the tank body 10, when the liquid level of the amine-containing solution is controlled to be higher than the heat exchange tube 20, the feeding is stopped, so that the amine-containing solution in the tank body 10 can contact the heat exchange tube 20, which is convenient for heat exchange between the heat exchange tube 20 and the amine-containing solution to increase the temperature of the amine-containing solution. It should be noted that the liquid level of the amine-containing solution is usually controlled to be 150 mm from the heat exchange tube 20, so that the distance between the liquid level of the amine-containing solution and the heat exchange tube 20 is within a certain range, which is convenient for the heat exchange tube 20 to heat the amine-containing solution on its surrounding side and upper part, ensuring that the amine solution can evaporate. When the liquid level of the amine-containing solution is higher than 150 mm, the heating of the amine-containing solution located on the heat exchange tube 20 and at a large distance from the heat exchange tube 20 is restricted, affecting the evaporation and recovery of the amine solution.

[0039] It should be noted that, due to the structural limitations and influences of the tank body 10 and the heat exchange tube 20 , the distance between the liquid level of the amine-containing solution and the heat exchange tube 20 can be set according to actual needs, and this application does not limit it.

[0040] As the temperature in the heat exchange tube 20 increases, the amine-containing solution is gradually evaporated. During the evaporation of the amine-containing solution, the amine liquid and water in the amine-containing solution are evaporated simultaneously. At the beginning, more water is evaporated than the amine liquid; as the evaporation proceeds and the temperature increases, more amine liquid is evaporated than the water; finally, as the evaporation proceeds and the temperature increases, the remaining amine liquid in the amine-containing solution evaporates. As the evaporation process of the amine-containing solution proceeds, the concentration of the amine solution in the tank body 10 gradually increases, the evaporation temperature also gradually increases, and the liquid level of the amine solution in the tank body 10 decreases.

[0041] When the liquid level of the amine-containing solution in the tank body 10 drops below the heat exchange tube 20, continue to add the amine-containing solution to the tank body 10 until the liquid level of the amine-containing solution reaches a set position (usually the liquid level of the amine-containing solution is controlled to be 150 mm from the heat exchange tube 20). Repeat the above steps until all the amine-containing solutions to be processed are added to the tank body 10.

[0042] It should be noted that, as the liquid level in the tank body 10 decreases, the batch of amine-containing solution to be treated is added to the tank body 10 in multiple times, and the amount of amine-containing solution added each time can be the same or different, and can be set according to actual needs, which is not limited in this application.

[0043] For the last time, the batch of amine-containing solution to be treated is completely added into the tank 10. When the amine liquid in the amine-containing solution in the tank 10 is completely evaporated, desalted water can be injected into the tank 10 through the desalted water injection port 16 to a position 150 mm above the heat exchange tube 20 to dilute the amine-containing solution so that the amine liquid in the amine-containing solution can be evaporated and recovered as much as possible. The above step of injecting desalted water is repeated at least twice to ensure that the amine liquid in the amine-containing solution is completely evaporated.

[0044] The cycle end method for judging that the amine solution in this batch of amine solution is completely evaporated is: the temperature detection data of this cycle is basically stable with the previous cycle, for example, stable within 1 degree Celsius, indicating that there is no active amine to be recovered, this batch of amine solution is completely recovered, and this round of recovery cycle ends. Add the next batch of amine solution, and circulate and recover the amine solution, and repeat this process.

[0045] The present application does not limit the cycle ending method of complete evaporation of the amine liquid in the amine-containing solution, and it can be set according to actual needs.

[0046] In order to more accurately control the liquid level of the amine solution in the tank 10, please refer to Figure 1The amine liquid recovery equipment also includes a local level meter (not shown in the figure) and a remote level meter (not shown in the figure). The local level meter is installed in the tank body 10 through the local level meter upper port 61 and the local level meter lower port 62, and the liquid level height of the amine solution in the tank body 10 can be checked in real time on site. The remote level meter is installed in the tank body 10 through the remote level meter upper port 71 and the local level meter lower port 72. The remote level meter is used in conjunction with the local level sensor to realize remote control of the liquid level of the amine solution in the tank body 10.

[0047] It should be noted that the upper opening 61 of the local level gauge corresponds to the lower opening 62 of the local level gauge, which is convenient for installing the local level gauge; the upper opening 71 of the remote level gauge corresponds to the lower opening 72 of the local level gauge, which is convenient for installing the remote level gauge. The corresponding position between the upper opening 61 of the local level gauge and the lower opening 62 of the local level gauge and the corresponding position between the upper opening 71 of the remote level gauge and the lower opening 72 of the local level gauge on the tank body 10 is not limited and can be adjusted according to actual needs.

[0048] In order to facilitate the transportation and replacement of low-pressure steam in the heat exchange tube 20, the heat exchange tube 20 includes a heat exchange section, a heat exchange inlet section having a heat exchange inlet 21, and a heat exchange outlet section having a heat exchange outlet 22. The heat exchange inlet section and the heat exchange outlet section are respectively connected to the two ends of the heat exchange section. The heat exchange section is located in the tank body 10, so the low-pressure steam can be transported from the heat exchange inlet 21 of the heat exchange inlet section to the heat exchange section of the heat exchange tube 20. While the heat exchange section of the heat exchange tube 20 exchanges heat with the amine-containing solution to increase the temperature of the amine-containing solution, the low-pressure steam in the heat exchange tube 20 condenses and is discharged through the heat exchange outlet 22 of the heat exchange outlet section. In this way, the circulation of the low-pressure steam in the heat exchange tube 20 can be realized, and the heat exchange temperature of the heat exchange tube 20 can be controlled, thereby ensuring the evaporation of the amine solution. The heat exchange inlet section and the heat exchange outlet section are respectively penetrated through the side wall of the tank body 10 and extend to the outside of the tank body 10, so as to facilitate the low-pressure steam to be transported to the heat exchange section of the heat exchange tube 20 and the discharge of the low-temperature steam condensed in the heat exchange tube 20.

[0049] See also Figure 1 The heat exchange tube 20 is U-shaped, and the two straight tube sections of the U-shaped heat exchange tube 20 serve as the heat exchange inlet section and the heat exchange outlet section respectively, and the bent section of the U-shaped heat exchange tube 20 serves as the heat exchange section and is located inside the tank body 10. At least two U-shaped heat exchange tubes 20 are provided, and the bent sections of the two heat exchange tubes 20 are located inside the tank body 10 and are arranged at intervals. The heat exchange inlet section and the heat exchange outlet section of the two U-shaped heat exchange tubes 20 are respectively passed through the two ends of the horizontal tank along the extension direction in opposite directions (that is, the two U-shaped heat exchange tubes 20 are symmetrically inserted into the horizontal tank), and at the same time, the outer edges of the bent sections of the two heat exchange tubes 20 are horizontally spaced by the diameter of the heat pipe. The distance between the outer edges of the bent sections of the two heat exchange tubes 20 can be set according to actual needs, and this application does not limit it.

[0050] In some embodiments, the heat exchange tube 20 includes a heat exchange section, a heat exchange inlet section having a heat exchange inlet 21, and a heat exchange outlet section having a heat exchange outlet 22. The heat exchange tube 20 penetrates the tank body 10 along the extension direction of the horizontal tank. The heat exchange inlet section and the heat exchange outlet section are penetrated through the side wall of the tank body 10 and extend to the outside of the tank body 10.

[0051] In some embodiments, see Figure 2 When the processing volume of the amine solution in the amine solution recovery device is small, a single U-shaped heat exchange tube 20 can also be arranged in the horizontal tank. Figure 2 The working principle and Figure 1 The working principle of the amine liquid recovery equipment in is similar and will not be elaborated here.

[0052] The amine liquid recovery equipment in the present application releases and recovers active amines by removing high boiling point and non-volatile impurities such as heat-stable salts, organic acids, solids, iron ions, etc. in the amine solvent through intermittent distillation, effectively solving the problem of amine liquid concentration decrease and active component reduction in the acid gas absorption system during long-term operation, and can recover useful amine liquid to the maximum extent, while effectively reducing the potential corrosion, foaming and scaling of the entire absorption system, and reducing sewage waste. The equipment is small in size, easy to clean, uses less materials, has low cost, and is simple and stable to operate.

[0053] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0054] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0055] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0057] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An amine liquid recovery device, characterized in that: The amine liquid recovery equipment comprises: The tank body is provided with a first inlet for adding an amine solution, a second inlet for adding a reaction material, a flushing port and an amine solution recovery port; The heat exchange tube extends into the tank body and is spaced apart from the bottom of the tank body.

2. The amine solution recovery equipment according to claim 1, characterized in that: The bottom of the tank body is sunken downward to form a pollutant gathering groove, and the flushing port is communicated with the bottom of the pollutant gathering groove.

3. The amine solution recovery equipment according to any one of claims 1 or 2, characterized in that: The amine solution recovery equipment also includes: A water spray pipe is connected to the inner wall of the tank body and is located between the heat exchange pipe and the tank bottom of the tank body, and a nozzle of the water spray pipe faces the tank bottom of the tank body.

4. The amine solution recovery equipment according to claim 3, characterized in that: The water spraying range of the water spraying pipe covers the tank bottom of the tank body.

5. The amine solution recovery equipment according to claim 1, characterized in that: The amine liquid recovery port is located in the middle of the top of the tank body.

6. The amine solution recovery equipment according to claim 1, characterized in that: The first inlet is arranged on the side wall of the tank body and is spaced apart from the tank bottom of the tank body.

7. The amine solution recovery equipment according to any one of claims 1 to 2 and 4 to 6, characterized in that: The heat exchange tube includes a heat exchange section, a heat exchange inlet section having a heat exchange inlet, and a heat exchange outlet section having a heat exchange outlet, wherein the heat exchange inlet section and the heat exchange outlet section are respectively connected to two ends of the heat exchange section; Wherein, the heat exchange section is located in the tank body, and the heat exchange inlet section and the heat exchange outlet section are respectively penetrated through the side wall of the tank body and extend to the outside of the tank body.

8. The amine solution recovery equipment according to claim 7, characterized in that: The heat exchange tube is U-shaped, and the two straight tube sections of the U-shaped heat exchange tube serve as the heat exchange inlet section and the heat exchange outlet section respectively, and the bent section of the U-shaped heat exchange tube serves as the heat exchange section and is located inside the tank body.

9. The amine solution recovery equipment according to claim 8, characterized in that: At least two heat exchange tubes are provided, and the bending sections of the two heat exchange tubes are arranged at intervals.

10. The amine solution recovery equipment according to any one of claims 1 to 2 and 4 to 6, characterized in that: The heat exchange tube includes a heat exchange section, a heat exchange inlet section having a heat exchange inlet, and a heat exchange outlet section having a heat exchange outlet. The heat exchange tube runs through the tank body. The heat exchange inlet section and the heat exchange outlet section are penetrated through the side wall of the tank body and extend to the outside of the tank body respectively.

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