System for purifying amine liquid

Abstract

The utility model relates to amine liquid purification, and provides a system for purifying amine liquid, which comprises an amine liquid supply system, a demineralized water supply system, an electrode water supply system, an electrodialyzer and a cleaning system, the amine liquid supply system, the demineralized water supply system, the electrode water supply system and the cleaning system are connected with the inlet end and the outlet end of the electrodialyzer at the same time. The system for purifying the amine liquid can efficiently purify the amine liquid, and after the amine liquid is purified, the index is higher, the loss is lower, and the cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of amine liquid purification, in particular to a system for purifying amine liquid. Background Art

[0002] Amine liquid is a general term for a class of organic alkaline solutions, usually referring to weakly alkaline organic amine solvents used to absorb hydrogen sulfide or carbon dioxide in the desulfurization and decarbonization chemical process, with alcohol amines being the most common. The active amine liquid absorption method is a deacidification method based on a reversible chemical reaction and using an alkaline solvent as an absorbent. The solvent reacts with the acid gas components in the raw gas to generate compounds; the rich liquid that absorbs the acid gas can decompose and release the acid gas under the conditions of increasing temperature and reducing pressure, thereby realizing the regeneration of the solvent.

[0003] During the use of amine liquid, some impurities such as hydrocarbons, degradation products, suspended solids and thermally stable salts will accumulate. The presence of these impurities will cause the amine liquid to foam, which will increase the heat required for amine liquid regeneration and consume amine liquid, causing blockage of equipment and pipelines, accelerating equipment pipeline corrosion, and seriously affecting the normal operation of the entire device. In order to solve the problem of amine liquid foaming, the amine liquid system needs to be purified in real time.

[0004] At present, the purification of amine liquid in the organic amine desulfurization system of various smelting enterprises mainly removes impurity ions in the amine liquid through the resin exchange system and the freezing crystallization system. During the operation of the resin exchange system, there are problems such as high amine liquid loss, low ion removal efficiency, and large amount of resin purification alkali solution; the freezing crystallization system can only remove thermally stable salts in the amine liquid. Both purification systems cannot meet the requirements of amine liquid purification. In addition, the existing amine liquid purification system has high operating costs, and the amine liquid purification efficiency does not meet production needs. The enrichment rate of impurity ions in the amine liquid is higher than the processing efficiency of the amine liquid purification system, and the amine liquid indicators are gradually deteriorating. Utility Model Content

[0005] The utility model aims to provide a system for purifying amine liquid, which can purify the amine liquid efficiently, and the purified amine liquid has higher indicators, lower loss and lower cost.

[0006] The embodiments of the utility model are realized through the following technical scheme: the system for purifying amine liquid of the utility model comprises an amine liquid supply system, a desalted water supply system, an extreme water supply system, an electrodialyser, and a cleaning system; the amine liquid supply system, the desalted water supply system, the extreme water supply system and the cleaning system are all connected to the inlet and outlet ends of the electrodialyser at the same time.

[0007] Furthermore, the cleaning system includes a first liquid conduit connected to the inlet end of the electrodialyzer, a second liquid conduit connected to the outlet end of the electrodialyzer, a liquid storage tank, a partition arranged in the liquid storage tank, and an air supply device; the partition divides the liquid storage tank into a first chamber and a second chamber, the air supply device is connected to the first chamber and the second chamber at the same time, the first liquid conduit is connected to the first chamber, and the second liquid conduit is connected to the second chamber.

[0008] Furthermore, both the first chamber and the second chamber are provided with exhaust pipes.

[0009] Furthermore, the air supply device includes an air compressor, an air pressure pipe connected to the air compressor, a three-way valve connected to the air pressure pipe, and a first conduit and a second conduit connected to the three-way valve; the first conduit is connected to the first chamber, and the second conduit is connected to the second chamber.

[0010] Furthermore, the three-way valve is an automatic three-way valve.

[0011] Furthermore, the cleaning system also includes a pipette for connecting the first chamber and the second chamber, and a pipette pump provided on the pipette.

[0012] Furthermore, the amine liquid supply system comprises an amine liquid tank, an amine liquid pump and an amine liquid filter connected to the electrodialyser in sequence.

[0013] Furthermore, the desalted water supply system includes a desalted water tank, a desalted water pump, a desalted water filter, and a desalted water heat exchanger connected to the electrodialyzer, which are connected in sequence.

[0014] Furthermore, the polar water supply system includes a polar water tank, a polar water pump, a polar water filter, and a polar water heat exchanger connected to the electrodialyzer, which are connected in sequence.

[0015] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects: when in use, the system for purifying amine liquid of the utility model respectively delivers the amine liquid, desalted water and polar water to be purified to the electrodialyzer through the amine liquid supply system, the desalted water supply system and the polar water supply system. Under the selective permeability of the ion exchange membrane of the electrodialyzer, the anions and cations in the solution migrate in a directional manner, thereby achieving the effect of separating ions from the solution, and the electrodialyzer can be cleaned regularly through the cleaning system to keep the separation efficiency high at all times. Compared with the traditional amine liquid purification method, this system does not need to use regeneration agents, uses less desalted water, has a higher ion removal rate, and can also be used to remove SO4 in the amine liquid. 2- 、F - , CL -、S2O3 2- And the heat-stable salts in the amine liquid, such as sodium sulfate, calcium sulfate, nitrate, and thiosulfate, can improve the amine liquid indicators and ensure the normal operation of the amine liquid desulfurization system. It has lower costs, less amine liquid loss, and can also achieve continuous pressing processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a system for purifying amine liquid provided in an embodiment of the utility model;

[0018] Figure 2 A schematic structural diagram of a cleaning system portion provided in an embodiment of the utility model.

[0019] Icons: 11-amine liquid tank, 12-amine liquid pump, 13-amine liquid filter, 21-deionized water tank, 22-deionized water pump, 23-deionized water filter, 24-deionized water heat exchanger, 31-polar water tank, 32-polar water pump, 33-polar water filter, 34-polar water heat exchanger, 40-cleaning system, 41-liquid storage tank, 42-partition, 43-first liquid guide tube, 44-second liquid guide tube, 45-first chamber, 46-second chamber, 47-air pressure tube, 48-three-way valve, 49-first conduit, 410-second conduit, 411-exhaust pipe, 412-pipette, 413-water pump, 50-electrodialyzer. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0023] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 on the present invention.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Example

[0026] The following is further described in conjunction with specific embodiments. Figure 1 -Attached Figure 2 As shown, the system for purifying amine liquid in this embodiment includes an amine liquid supply system, a desalted water supply system, an extreme water supply system, an electrodialyzer 50, and a cleaning system 40; the amine liquid supply system, the desalted water supply system, the extreme water supply system, and the cleaning system 40 are all connected to the inlet and outlet of the electrodialyzer 50 at the same time. Specifically, when in use, the amine liquid, desalted water, and extreme water to be purified are respectively fed into the electrodialyzer 50 through the amine liquid supply system, the desalted water supply system, and the extreme water supply system. Under the selective permeability of the ion exchange membrane of the electrodialyzer 50, the anions and cations in the solution migrate in a directional manner, thereby achieving the effect of separating ions from the solution, and the cleaning system 40 can regularly clean the electrodialyzer 50, so that it always maintains a high separation efficiency. And compared with the traditional amine liquid purification method, this system does not need to use a regeneration agent, uses less desalted water, has a higher ion removal rate, and can also be used to remove SO4 in the amine liquid. 2- 、F - , CL - 、S2O3 2-And the heat-stable salts of sodium sulfate, calcium sulfate, nitrate, and thiosulfate in the amine solution, improve the amine solution index, ensure the normal operation of the amine solution desulfurization system, and have lower costs, less amine solution loss, and can also achieve continuous processing of pressing. It should be noted that there are amine solution passages, desalted water passages, and polar water passages in the electrodialyzer, and the cleaning device needs to be connected to the above three passages at the same time and clean them at the same time.

[0027] The cleaning system 40 in this embodiment includes a first liquid conduit 43 connected to the inlet end of the electrodialyzer 50, a second liquid conduit 44 connected to the outlet end of the electrodialyzer 50, a liquid storage tank 41, a partition 42 disposed in the liquid storage tank 41, and an air supply device; the partition 42 divides the liquid storage tank 41 into a first chamber 45 and a second chamber 46, the air supply device is connected to the first chamber 45 and the second chamber 46 at the same time, the first liquid conduit 43 is connected to the first chamber 45, and the second liquid conduit 44 is connected to the second chamber 46. Specifically, as shown in the attached Figure 2 As shown, before cleaning, it is necessary to first shut down the amine solution supply system, the desalted water supply system, and the polar water supply system to supply liquid to the electrodialyzer 50, and then the electrodialyzer 50 can be reciprocatedly cleaned in the forward and reverse directions by the cleaning liquid in the liquid storage tank 41. Specifically, it can be achieved by intermittently supplying air to the first chamber 45 and the second chamber 46 respectively through the air supply device. When only the first chamber 45 is supplied with air, the cleaning liquid in the first chamber 45 can be sent to the inlet end of the electrodialyzer 50 through the first liquid guide tube 43. Forward cleaning is achieved; when only air is supplied to the second chamber 46, the cleaning liquid in the second chamber 46 can be sent to the outlet end of the electrodialyzer 50 through the second liquid conduit 44 to achieve backwashing; in this way, by quickly and repeatedly switching the air supply, not only forward cleaning and reverse cleaning can be achieved, and the membrane in the electrodialyzer 50 can be better cleaned, but also high-frequency reciprocating impact can be formed in the electrodialyzer 50, that is, the cleaning liquid can generate a certain frequency of vibration in the electrodialyzer 50, so as to better perform the cleaning operation.

[0028] In this embodiment, both the first chamber 45 and the second chamber 46 are provided with an exhaust pipe 411. Specifically, the exhaust pipe 411 is mainly used to balance the air pressure, so an automatic valve needs to be provided on the exhaust pipe 411.

[0029] The gas supply device in this embodiment includes an air compressor, an air pressure pipe 47 connected to the air compressor, a three-way valve 48 connected to the air pressure pipe 47, and a first conduit 49 and a second conduit 410 connected to the three-way valve 48; the first conduit 49 is connected to the first chamber 45, and the second conduit 410 is connected to the second chamber 46. Specifically, the three-way valve 48 enables the gas to enter the first conduit 49 (i.e., enter the first chamber 45) or the second conduit 410 (i.e., enter the second chamber 46).

[0030] The three-way valve 48 in this embodiment is an automatic three-way valve 48. Specifically, the three-way valve 48 can be quickly switched by an electromagnetic or pneumatic three-way valve 48.

[0031] The cleaning system 40 in this embodiment further includes a pipette 412 for connecting the first chamber 45 and the second chamber 46 , and a pipette pump 413 disposed on the pipette 412 . Specifically, the pipette pump 413 and the pipette 412 can realize that during the reciprocating motion of the cleaning liquid in the electrodialyzer 50 at the microscopic level, the cleaning liquid is still moving in one direction at the macroscopic level. The liquid in the first chamber 45 is slowly transferred to the second chamber 46 (or vice versa) by the pipette pump 413 and the pipette 412, so that the amount of liquid in the first chamber 45 slowly decreases and the liquid in the second chamber 46 gradually increases. Then, the air in the first chamber 45 gradually increases and the air in the second chamber 46 gradually decreases. At this time, when the same amount of air is pumped into the first chamber 45 and the second chamber 46, due to the compressibility of air, the liquid discharged from the first chamber 45 is less than the liquid discharged from the second chamber 46, which means that the cleaning liquid moves different distances to both sides in one reciprocating motion cycle. In this way, the cleaning liquid moves to one side at the macroscopic level. The purpose of this is to facilitate the real-time replacement of the cleaning liquid.

[0032] The amine liquid supply system in this embodiment includes an amine liquid tank 11, an amine liquid pump 12, and an amine liquid filter 13 connected to the electrodialyzer 50. The desalted water supply system includes a desalted water tank 21, a desalted water pump 22, a desalted water filter 23, and a desalted water heat exchanger 24 connected to the electrodialyzer 50. The polar water supply system includes a polar water tank 31, a polar water pump 32, a polar water filter 33, and a polar water heat exchanger 34 connected to the electrodialyzer 50. Specifically, these devices are mainly used to pre-treat amine liquid, desalted water, and polar water.

[0033] In summary, the system for purifying amine liquid in this embodiment, when in use, delivers the amine liquid, desalted water and polar water to be purified to the electrodialyzer 50 through the amine liquid supply system, the desalted water supply system and the polar water supply system. Under the selective permeability of the ion exchange membrane of the electrodialyzer 50, the anions and cations in the solution migrate in a directional manner, thereby achieving the effect of separating ions from the solution, and the electrodialyzer 50 can be cleaned regularly through the cleaning system 40, so that it always maintains a high separation efficiency. Compared with the traditional amine liquid purification method, this system does not require the use of regeneration agents, uses less desalted water, has a higher ion removal rate, and can also be used to remove SO4 in the amine liquid. 2- 、F - , CL - 、S2O3 2-And the heat-stable salts in the amine liquid, such as sodium sulfate, calcium sulfate, nitrate, and thiosulfate, can improve the amine liquid indicators and ensure the normal operation of the amine liquid desulfurization system. It has lower costs, less amine liquid loss, and can also achieve continuous pressing processing.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for purifying amine liquid, characterized in that: It includes an amine solution supply system, a desalted water supply system, an electrode water supply system, an electrodialyzer (50), and a cleaning system (40); The amine solution supply system, the desalted water supply system, the polar water supply system and the cleaning system (40) are all connected to the inlet and outlet of the electrodialyser (50) at the same time.

2. The system for purifying amine liquid according to claim 1, characterized in that: The cleaning system (40) comprises a first liquid conduit (43) connected to the inlet end of the electrodialyser (50), a second liquid conduit (44) connected to the outlet end of the electrodialyser (50), a liquid storage tank (41), a partition (42) arranged in the liquid storage tank (41), and an air supply device; The partition (42) divides the liquid storage tank (41) into a first chamber (45) and a second chamber (46); the air supply device is connected to the first chamber (45) and the second chamber (46) at the same time; the first liquid conduit (43) is connected to the first chamber (45); and the second liquid conduit (44) is connected to the second chamber (46).

3. The system for purifying amine liquid according to claim 2, characterized in that: The first chamber (45) and the second chamber (46) are both provided with an exhaust pipe (411).

4. The system for purifying amine liquid according to claim 3, characterized in that: The air supply device comprises an air compressor, an air pressure pipe (47) connected to the air compressor, a three-way valve (48) connected to the air pressure pipe (47), and a first conduit (49) and a second conduit (410) connected to the three-way valve (48); the first conduit (49) is connected to the first chamber (45), and the second conduit (410) is connected to the second chamber (46).

5. The system for purifying amine liquid according to claim 4, characterized in that: The three-way valve (48) is an automatic three-way valve (48).

6. The system for purifying amine liquid according to claim 2, characterized in that: The cleaning system (40) further comprises a pipette (412) for connecting the first chamber (45) and the second chamber (46), and a pipette pump (413) disposed on the pipette (412).

7. The system for purifying amine liquid according to claim 1, characterized in that: The amine liquid supply system comprises an amine liquid tank (11), an amine liquid pump (12) and an amine liquid filter (13) connected to the electrodialyser (50) in sequence.

8. The system for purifying amine liquid according to claim 1, characterized in that: The desalted water supply system comprises a desalted water tank (21), a desalted water pump (22), a desalted water filter (23), and a desalted water heat exchanger (24) connected to the electrodialyzer (50) in sequence.

9. The system for purifying amine liquid according to claim 1, characterized in that: The polar water supply system comprises a polar water tank (31), a polar water pump (32), a polar water filter (33) connected in sequence, and a polar water heat exchanger (34) connected to the electrodialyser (50).

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