Amine liquid purification equipment for oxidation-process tail gas absorption system

Abstract

The utility model provides amine liquid purification equipment of an oxidation process tail gas absorption system, which comprises a purification mechanism and an adsorption tower communicated with the purification mechanism, the purification mechanism comprises a security filter, an ion exchange resin bed, an amine liquid storage tank, a circulating cleaning box and a demineralized water storage box, an outlet of the security filter is communicated with a first inlet of the ion exchange resin bed, a first outlet of the ion exchange resin bed is communicated with an inlet of the amine liquid storage tank, an outlet of the amine liquid storage tank is communicated with an inlet of the adsorption tower, and a first inlet of the circulating cleaning tank is communicated with a first outlet of the desalted water storage tank; a first inlet of the circulating cleaning box is communicated with a first inlet of the ion exchange resin bed, a first outlet of the circulating cleaning box is communicated with a second inlet of the ion exchange resin bed, and a second outlet of the ion exchange resin bed is communicated with a second inlet of the circulating cleaning box. And the service life of the ion exchange resin bed is greatly prolonged.

Description

Technical Field

[0001] This utility model relates to the field of purification equipment technology, specifically to an amine liquid purification device for an oxidation method tail gas absorption system. Background Technology

[0002] Oxidation-based flue gas desulfurization systems primarily use organic amines as absorbents to absorb sulfur dioxide from flue gas. Organic amines continuously generate sulfate and other weak acid anions, causing a continuous decrease in the system's pH. This leads to the accumulation of sulfate and other weak acid anions in the organic amine solution due to continuous sulfur dioxide absorption, further lowering the system pH and easily causing equipment corrosion. Traditional solutions involve periodic replacement of the amine solution or manual regeneration, which suffers from high operating costs, complex operations, and long downtime, resulting in low purification efficiency of the organic amine solution. Utility Model Content

[0003] In view of this, the present invention provides an amine liquid purification device for an oxidation method tail gas absorption system, which can achieve efficient purification of organic amine liquid through a purification mechanism, and can repeatedly repair the purification capacity of the ion exchange resin bed to ensure that it always has efficient purification capacity, greatly reducing costs and making operation simpler and more convenient.

[0004] To solve the above-mentioned technical problems, this utility model provides an amine liquid purification device for an oxidation process tail gas absorption system, including a purification mechanism and an adsorption tower connected thereto. The purification mechanism includes a security filter, an ion exchange resin bed, an amine liquid storage tank, a circulating cleaning tank, and a demineralized water storage tank. The inlet of the security filter is connected to the outlet of the organic amine liquid via a pipe, and the outlet of the security filter is connected to the first inlet of the ion exchange resin bed via a pipe. The ion exchange resin bed contains a strongly basic anion exchange resin layer and a weakly basic anion exchange resin layer. The first outlet of the ion exchange resin bed is connected to the inlet of the amine liquid storage tank via a pipe, and the outlet of the amine liquid storage tank is connected to the inlet of the adsorption tower via a pipe. The pipelines are interconnected. The first inlet of the circulating cleaning tank is connected to the first outlet of the demineralized water storage tank via a pipeline. The first outlet of the circulating cleaning tank is connected to the second inlet of the ion exchange resin bed via a pipeline. The second outlet of the ion exchange resin bed is connected to the second inlet of the circulating cleaning tank via a pipeline. All pipelines are corrosion-resistant and pressure-resistant. This utility model can achieve continuous reciprocating circulation purification of organic amine liquid through the purification mechanism, which greatly enhances the purification efficiency and effect of organic amine liquid. Through the circulation of demineralized water in the circulating cleaning tank, the residual organic amine liquid in the ion exchange resin bed is efficiently diluted, which improves the service life of the ion exchange resin bed to a certain extent.

[0005] The purification unit also includes an alkali tank and an alkali storage tank. The inlet of the alkali tank and the outlet of the alkali storage tank are connected by a pipeline. The alkali tank stores an alkali solution with a concentration of 30%. The outlet of the alkali tank is connected by a pipeline to the third inlet of the ion exchange resin bed. The third outlet of the ion exchange resin bed is also equipped with a wastewater treatment device connected to it by a pipeline.

[0006] The second outlet of the demineralized water storage tank is connected to the fourth inlet of the ion exchange resin bed via a pipeline, and demineralized water or distilled water is introduced into the demineralized water storage tank.

[0007] A flow meter and a regulating valve are installed on the pipeline connecting the outlet of the security filter to the inlet of the amine storage tank. Both the flow meter and the regulating valve are electrically controlled components and are electrically connected to the controller, which is a PLC controller. This controller is used to collect the flow rate of the amine liquid filtered by the security filter and the flow and shut-off of the liquid in the pipeline, making the operation more convenient, efficient and intelligent.

[0008] A circulating water pump is installed on the pipe connecting the first outlet of the demineralized water storage tank and the first inlet of the circulating cleaning tank.

[0009] A pipe mixer is installed on the pipe connecting the outlet of the alkali tank, the second outlet of the demineralized water storage tank, and the third inlet of the ion exchange resin bed.

[0010] An alkali metering pump is installed on the pipeline connecting the outlet of the alkali tank and the inlet of the pipeline mixer. The alkali metering pump is an electromagnetic metering pump, which is electrically connected to the PLC controller.

[0011] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0012] 1. This utility model can perform preliminary filtration by introducing organic amine liquid into a security filter. The main purpose is to pre-treat the organic amine liquid, remove solid impurities, protect the subsequent ion exchange resin bed, and ensure the efficient and stable operation of the system. If necessary, a backflushing function can be added to reduce the maintenance frequency and improve the availability of the filtration mechanism.

[0013] 2. This utility model can greatly reduce the floor space by integrating the purification equipment onto the skid. The skid-mounted structure can reduce the floor space by at least 40%, making it suitable for rapid on-site deployment and more convenient. Moreover, the purified amine liquid can be introduced into the purification tower, and the residual gas inside can be removed by oxidation, thereby achieving efficient purification of organic amine liquid and making operation more convenient.

[0014] 3. This utility model can efficiently discharge the residual organic amine liquid in the pipeline of the purification unit by introducing demineralized water into the circulating cleaning tank, thus avoiding its residue in the pipeline of the purification unit, which could lead to pipeline corrosion or affect the regeneration capacity of the plasma resin bed.

[0015] 4. This invention can rapidly and efficiently restore the high-efficiency exchange capacity of the ion exchange resin bed by mixing demineralized water and alkaline solution and then introducing them into the ion exchange resin bed, thereby greatly improving the exchange capacity of the plasma resin bed. Attached Figure Description

[0016] Figure 1 This is a system flow diagram of the amine liquid purification equipment in the oxidation method tail gas absorption system of this utility model;

[0017] Figure 2 This is a schematic diagram of the system piping of the amine liquid purification equipment in the oxidation method tail gas absorption system of this utility model.

[0018] Explanation of reference numerals in the attached drawings: 100, purification unit; 101, security filter; 102, ion exchange resin bed; 103, amine solution storage tank; 104, circulating cleaning tank; 105, demineralized water storage tank; 106, alkali solution tank; 107, alkali solution storage tank; 200, adsorption tower; 300, wastewater treatment equipment; 400, flow meter; 500, regulating valve; 600, circulating water pump; 700, pipeline mixer; 800, alkali solution metering pump. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-2 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0020] like Figure 1-2As shown: This embodiment provides an amine liquid purification device for an oxidation process tail gas absorption system, including a purification mechanism 100 and an adsorption tower 200 connected thereto. The purification mechanism 100 includes a security filter 101, an ion exchange resin bed 102, an amine liquid storage tank 103, a circulating cleaning tank 104, and a demineralized water storage tank 105. The inlet of the security filter 101 is connected to the outlet of the organic amine liquid via a pipe, and the outlet of the security filter 101 is connected to the first inlet of the ion exchange resin bed 102 via a pipe. The ion exchange resin bed 102 contains a strongly basic anion exchange resin layer and a weakly basic anion exchange resin layer. The first outlet of the ion exchange resin bed 102 is connected to the inlet of the amine liquid storage tank 103 via a pipe, and the outlet of the amine liquid storage tank 103 is connected to the inlet of the adsorption tower 200. The inlets are connected by pipes. The first inlet of the circulating cleaning tank 104 is connected to the first outlet of the demineralized water storage tank 105 by a pipe. The first outlet of the circulating cleaning tank 104 is connected to the second inlet of the ion exchange resin bed 102 by a pipe. The second outlet of the ion exchange resin bed 102 is connected to the second inlet of the circulating cleaning tank 104 by a pipe. All pipes are corrosion-resistant and pressure-resistant pipes. This utility model can realize continuous reciprocating circulation purification of organic amine liquid through the purification mechanism 100, which greatly enhances the purification efficiency and effect of organic amine liquid. Through the circulation of demineralized water in the circulating cleaning tank 104, the residual organic amine liquid in the ion exchange resin bed 102 is efficiently diluted, which improves the service life of the ion exchange resin bed 102 to a certain extent.

[0021] According to one embodiment of the present invention, such as Figure 1 As shown, the purification mechanism 100 also includes an alkali tank 106 and an alkali storage tank 107. The inlet of the alkali tank 106 and the outlet of the alkali storage tank 107 are connected by a pipe. The alkali tank 106 stores an alkali solution with a concentration of 30%. The outlet of the alkali tank 106 is connected by a pipe to the third inlet of the ion exchange resin bed 102. A wastewater treatment device 300, connected to the third outlet of the ion exchange resin bed 102 via a pipe, is also installed thereon. This invention allows the alkali solution stored in the alkali storage tank to be introduced into the ion exchange resin bed 102, restoring the resin's exchange capacity. This is because after a period of use, the ion exchange resin bed 102 gradually becomes saturated due to the adsorption of acid radical ions, losing its exchange capacity. At this point, regeneration is needed to restore its function. The alkali solution (e.g., NaOH solution) can react with the acid radical ions adsorbed on the resin, displacing these ions and thus restoring the resin's exchange capacity.

[0022] According to another embodiment of the present invention, such as Figure 1 and Figure 2As shown, the second outlet of the demineralized water storage tank 105 is connected to the fourth inlet of the ion exchange resin bed 102 via a pipe. Demineralized water or distilled water is introduced into the demineralized water storage tank 105. This invention can introduce the demineralized water in the demineralized water storage tank 105 into the plasma resin bed, thereby diluting the concentration of the alkaline solution to 5%, and thus achieving rapid and efficient recovery of the high-efficiency exchange capacity of the ion exchange resin bed, greatly improving the exchange capacity of the plasma resin bed.

[0023] According to another embodiment of the present invention, such as Figure 2 As shown, a flow meter 400 and a regulating valve 500 are installed on the pipeline connecting the outlet of the security filter 101 to the inlet of the amine storage tank 103. Both the flow meter 400 and the regulating valve 500 are electrically controlled components and are electrically connected to the controller, which is a PLC controller. The controller is used to collect the flow rate of the amine liquid filtered by the security filter 101 and the flow and shut-off of the liquid in the pipeline, making the operation more convenient, efficient and intelligent.

[0024] A circulating water pump 600 is installed on the pipe connecting the first outlet of the demineralized water storage tank 105 and the first inlet of the circulating cleaning tank 104. This utility model can realize the efficient and repeated recycling of the demineralized water in the circulating cleaning tank 104 through the circulating water pump 600, making the operation more convenient.

[0025] A pipe mixer 700 is installed on the pipe connecting the outlet of the alkali tank 106, the second outlet of the demineralized water storage tank 105, and the third inlet of the ion exchange resin bed 102. This utility model can achieve efficient dilution of alkali and demineralized water entering the plasma resin bed through the pipe mixer 700, which greatly improves the efficiency of alkali discharge in the system pipeline and quickly dilutes the alkali to a suitable concentration, making the operation more convenient and efficient.

[0026] An alkali metering pump 800 is installed on the pipeline connecting the outlet of the alkali tank 106 and the inlet of the pipeline mixer 700. The alkali metering pump 800 is an electromagnetic metering pump, which is electrically connected to the PLC controller. This utility model can use the alkali metering pump 800 to conveniently meter the alkali entering the pipeline mixer 700, so as to facilitate real-time monitoring of the amount of alkali and demineralized water entering the pipeline mixer 700, and to facilitate timely monitoring of the amount of alkali entering the plasma resin bed, which is more convenient.

[0027] How to use this utility model:

[0028] First, it needs to be clarified that the purification equipment involved in this utility model is mainly used for the purification treatment of organic amine liquid in the sulfur dioxide removal system of the oxidation process tail gas. This is to remove sulfate and other weak acid ions that are continuously generated in the organic amine. The amine is then introduced into an absorption tower to remove sulfate and other acid ions from the flue gas. The principle is to remove sulfate and other acid ions from the organic amine liquid using an ion exchange process. A PLC controller is electrically connected to the system's monitoring instruments, valves, pumps, etc., to control the efficient operation of the entire system and continuously ensure and restore the high-efficiency purification capacity of the ion exchange resin bed. This utility model uses an ion exchange process to remove sulfate and other acid ions from the organic amine liquid. Taking the working principle of sulfate and other acid radicals as an example, the usage method is explained in detail. When it is necessary to purify organic amine liquid, the organic amine liquid to be purified is introduced into the security filter 101. After preliminary filtration by the security filter 101, it is introduced into the ion exchange resin bed 102. The various resins in the ion exchange resin bed react to remove sulfate and other weak acid radicals generated in the organic amine liquid. The removed organic amine liquid is introduced into the absorption tower, which can absorb and treat harmful gases such as sulfur dioxide. After treatment, when it is necessary to discharge the residual organic amine liquid in the pipeline of the purification system, the... Demineralized water is introduced into the circulating cleaning tank 104, and then into the pipeline system. This ensures efficient discharge of the organic amine solution, preventing it from remaining in the pipeline and corroding it. The discharged organic amine solution is then introduced into the amine storage tank 103, and finally into the absorption tower. The efficient circulation of the demineralized water in the circulating cleaning tank 104 with the organic amine solution after adsorption in the ion exchange resin bed significantly improves the efficiency of removing residual organic amine solution from the pipeline. When the purification capacity of the ion exchange resin bed decreases, the alkaline solution is diluted to 5% with the demineralized water and then reintroduced into the purification system to improve the purification capacity of the ion exchange resin. The system performs efficient repair. Excess organic amine solution is discharged from the circulating cleaning tank 104 for recycling, while the remainder is discharged into the wastewater treatment equipment 300. After the ion exchange resin bed 102 recovers its purification capacity, demineralized water is introduced to efficiently discharge the residual alkaline solution in the pipeline system. This invention can introduce organic amine solution into the security filter 101 for preliminary filtration. The main purpose is to pre-treat the organic amine solution, remove solid impurities, protect the subsequent ion exchange resin bed 102, and ensure the efficient and stable operation of the system. If necessary, a backflushing function can be added to reduce the maintenance frequency and improve the availability of the filtration mechanism.

[0029] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An amine liquid purification device for an oxidation process tail gas absorption system, comprising a purification mechanism (100) and an adsorption tower (200) in communication therewith, characterized in that: The purification mechanism (100) comprises a security filter (101), an ion exchange resin bed (102), an amine liquid storage tank (103), a circulating cleaning tank (104) and a desalted water storage tank (105), wherein the inlet of the security filter (101) is communicated with the discharge port of the organic amine liquid, the outlet of the security filter (101) is communicated with the first inlet of the ion exchange resin bed (102), the first outlet of the ion exchange resin bed (102) is communicated with the inlet of the amine liquid storage tank (103), the outlet of the amine liquid storage tank (103) is communicated with the inlet of the adsorption tower (200), the first inlet of the circulating cleaning tank (104) is communicated with the first outlet of the desalted water storage tank (105), the first outlet of the circulating cleaning tank (104) is communicated with the second inlet of the ion exchange resin bed (102), and the second outlet of the ion exchange resin bed (102) is communicated with the second inlet of the circulating cleaning tank (104).

2. The amine purification equipment of the oxidation process tail gas absorption system according to claim 1, characterized in that: The purification mechanism (100) further comprises a lye tank (106) and a lye storage tank (107), wherein the inlet of the lye tank (106) is communicated with the outlet of the lye storage tank (107), the outlet of the lye tank (106) is communicated with the third inlet of the ion exchange resin bed (102), and the third outlet of the ion exchange resin bed (102) is further provided with a waste water decontamination sewage treatment device (300) communicated therewith.

3. The amine purification apparatus of the oxidized off-gas absorption system according to claim 2, wherein: The second outlet of the desalted water storage tank (105) is communicated with the fourth inlet of the ion exchange resin bed (102).

4. The amine purification apparatus of the oxidizer off-gas absorption system according to claim 3, wherein: The outlet of the security filter (101) is communicated with the inlet of the amine liquid storage tank (103), and a flow meter (400) and an adjusting valve (500) are arranged on the pipeline.

5. The amine purification apparatus of the oxidizer off-gas absorption system according to claim 4, wherein: The first outlet of the desalted water storage tank (105) and the first inlet of the circulating cleaning tank (104) are communicated, and a circulating water pump (600) is arranged on the pipeline.

6. The amine purification apparatus of the oxidizer off-gas absorption system according to claim 5, wherein: The outlet of the lye tank (106) and the second outlet of the desalted water storage tank (105) and the third inlet of the ion exchange resin bed (102) are communicated, and a pipeline mixer (700) is arranged on the pipeline.

7. The amine purification apparatus of the oxidizer off-gas absorption system according to claim 6, wherein: The outlet of the lye tank (106) is communicated with the inlet of the pipeline mixer (700), and a lye metering pump (800) is arranged on the pipeline.

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