Method for controlling regeneration dose and concentration of ion exchange resin

Abstract

The invention provides an ion exchange resin regeneration dose and concentration control method, which comprises the following steps of: additionally arranging a first concentration meter on a liquid inlet pipeline of a resin regeneration device for metering the concentration of acid liquor or alkali liquor entering the resin regeneration device; a second concentration meter is additionally arranged on a liquid outlet pipeline of the resin regeneration device and is used for metering the concentration of acid liquor or alkali liquor discharged out of the resin regeneration device; and when the difference value between the second concentration meter and the first concentration meter is + / -0.1%, the treatment of the ion exchange resin in the resin regeneration device is completed. According to the method provided by the invention, the optimal acid and alkali consumption and proper acid and alkali concentration required by cation and anion resin regeneration can be designed, so that the optimal control of the acid and alkali consumption is realized on the premise of ensuring the resin regeneration effect.

Description

Technical Field

[0001] The present application relates to the technical field of ion exchange resin regeneration, and in particular to a method for controlling the dosage and concentration of ion exchange resin regeneration. Background Art

[0002] The main function of the in vitro regeneration process of condensate polishing resin in power plants is to restore the exchange capacity of the failed resin, and to restore the failed resin to hydrogen-type cation resin and hydrogen-oxygen anion resin through acid and alkali regeneration liquid. At present, domestic power plants mainly use two acid and alkali introduction processes, namely "acid and alkali storage tank + metering pump" and "acid and alkali storage tank + acid and alkali metering box + ejector".

[0003] Power plants generally use the acid and alkali concentration meters, dilution water flow and acid and alkali feeding time of the cation and anion regeneration towers to control the regeneration dosage and the concentration of acid and alkali. However, there are the following problems in the actual application of the concentration meter: In order to ensure the regeneration effect, power plants generally choose excessive regeneration, resulting in high concentrations of regenerated acid and alkali and too long acid and alkali feeding time. High regeneration concentrations and too long acid and alkali feeding time will increase regeneration costs and produce more high-salt wastewater. It is impossible to meet the requirements of economic and environmental protection of the resin regeneration system, so it is very necessary to accurately control the regeneration dosage and concentration of ion exchange resin. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems in the related art to a certain extent. The present application proposes a method for controlling the dosage and concentration of ion exchange resin regeneration, which can design the optimal acid and alkali consumption and appropriate acid and alkali concentration required for the regeneration of cation and anion resins, so as to achieve the optimal control of acid and alkali consumption while ensuring the resin regeneration effect.

[0005] According to an embodiment of the present application, a method for controlling the dosage and concentration of an ion exchange resin regeneration is proposed, comprising the following steps:

[0006] A first concentration meter is added to the liquid inlet pipeline of the resin regeneration device to measure the concentration of the acid solution or the alkali solution entering the resin regeneration device;

[0007] A second concentration meter is provided on the liquid outlet pipeline of the resin regeneration device for measuring the concentration of the acid solution or the alkali solution discharged from the resin regeneration device; and

[0008] When the difference between the second concentration meter and the first concentration meter is ±0.1%, the treatment of the ion exchange resin in the resin regeneration device is completed.

[0009] In some embodiments, the resin regeneration device includes a resin regeneration tower and the liquid inlet pipeline and the liquid outlet pipeline both connected to the resin regeneration tower; valves and injectors are sequentially arranged on the liquid inlet pipeline according to the liquid inlet direction of the acid solution or the alkali solution; the first concentration meter is located downstream of the injector; the acid solution or the alkali solution enters the injector through a valve; and the injector is also connected to incoming water.

[0010] In some embodiments, the resin regeneration tower includes a cation resin regeneration tower or an anion resin regeneration tower; the acid solution enters the cation resin regeneration tower; and the alkali solution enters the anion resin regeneration tower.

[0011] In some embodiments, the cation resin regeneration tower is provided with a hydrochloric acid regeneration cation resin or a sulfuric acid regeneration cation resin.

[0012] In some embodiments, when the hydrochloric acid regeneration cation resin is provided in the cation resin regeneration tower, the mass concentration of the first concentration meter is 3%-4%.

[0013] In some embodiments, when the cation resin regeneration tower is provided with the sulfuric acid regeneration cation resin, the mass concentration of the first concentration meter is 3%-4%.

[0014] In some embodiments, the mass concentration of the alkali solution is 3%-4%.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0017] Figure 1 is a schematic diagram for controlling the regeneration dosage and concentration of the ion exchange resin according to one embodiment of the present application;

[0018] Figure 2 It is a schematic diagram for controlling the regeneration dosage and concentration of ion exchange resin according to one embodiment of the present application. DETAILED DESCRIPTION

[0019] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be construed as limiting the present application. On the contrary, the present application includes all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0020] According to an embodiment of the present application, a method for controlling the dosage and concentration of an ion exchange resin regeneration is proposed, comprising the following steps:

[0021] S1: A first concentration meter is added to the liquid inlet pipeline of the resin regeneration device to measure the concentration of the acid solution or alkali solution entering the resin regeneration device;

[0022] S2: A second concentration meter is added to the liquid outlet pipeline of the resin regeneration device to measure the concentration of the acid solution or alkali solution discharged from the resin regeneration device; and

[0023] S3: When the difference between the second concentration meter and the first concentration meter is ±0.1%, the treatment of the ion exchange resin in the resin regeneration device is completed.

[0024] Among them, in S1, a first concentration meter is added to the liquid inlet pipeline of the resin regeneration device. In this embodiment, the resin regeneration device includes a resin regeneration tower and a liquid inlet pipeline and a liquid outlet pipeline both connected to the resin regeneration tower; a valve, an injector and a first concentration meter are sequentially arranged on the liquid inlet pipeline according to the liquid inlet direction of the acid or alkali solution; the acid or alkali solution enters the injector through the valve; the injector is also connected to incoming water.

[0025] For example, the resin regeneration tower includes a cation resin regeneration tower or an anion resin regeneration tower; the acid solution enters the cation resin regeneration tower; and the alkali solution enters the anion resin regeneration tower. Figure 1 As shown, the cation resin regeneration tower is provided with hydrochloric acid regeneration cation resin or sulfuric acid regeneration cation resin, and the cation resin regeneration tower is provided with a liquid inlet and a liquid outlet, wherein the liquid inlet is connected to the liquid inlet pipeline, and the liquid outlet is connected to the liquid outlet pipeline. According to the liquid inlet direction of the acid or alkali solution, a valve, an injector and a first concentration meter are sequentially arranged on the liquid inlet pipeline; the acid or alkali solution enters the injector through the valve; that is, the acid or alkali solution enters the liquid inlet pipeline, passes through the valve and the injector in sequence, and the first concentration meter is located downstream of the injector. At the same time, the injector is also connected to incoming water. When the acid enters the liquid inlet pipeline, the incoming water connected to the injector is dilution water; when the alkali solution enters the liquid inlet pipeline, the incoming water connected to the injector is the incoming water of the electric heating box.

[0026] The present application can utilize the liquid inlet pipeline to input hydrochloric acid or sulfuric acid into the cation resin regeneration tower. The first concentration meter is used to measure the concentration of the hydrochloric acid or sulfuric acid entering the resin regeneration device. The mass concentration of the first concentration meter is 3%-4%. The hydrochloric acid or sulfuric acid entering the cation resin regeneration tower reacts with the hydrochloric acid-regenerated cation resin or the sulfuric acid-regenerated cation resin in the cation resin regeneration tower, and ion exchange occurs to achieve the regeneration of the hydrochloric acid-regenerated cation resin or the sulfuric acid-regenerated cation resin. The concentration of the hydrochloric acid or sulfuric acid in the cation resin regeneration tower is gradually consumed, and finally it is discharged from the cation resin regeneration tower after no longer reacting with the hydrochloric acid-regenerated cation resin or the sulfuric acid-regenerated cation resin.

[0027] In S2, a second concentration meter is added to the liquid outlet pipeline of the resin regeneration device to measure the concentration of the acid or alkali solution discharged from the resin regeneration device. Figure 1 As shown, a second concentration meter is provided on the outlet pipe of the cation resin regeneration tower to measure the concentration of the acid or alkali solution discharged from the resin regeneration device. When the acid or alkali solution passing through the second concentration meter is compared with the measured value of the first concentration meter by calculating its concentration. When the difference between the second concentration meter and the first concentration meter in S3 is ±0.1%, the treatment of the ion exchange resin in the resin regeneration device is completed.

[0028] Example 1

[0029] like Figure 1 The resin regeneration device shown includes a cationic resin regeneration tower, in which hydrochloric acid is provided to regenerate the cationic resin. The cationic resin regeneration tower is provided with a liquid inlet and a liquid outlet, wherein the liquid inlet is connected to a liquid inlet pipeline, and the liquid outlet is connected to a liquid outlet pipeline. According to the liquid inlet direction of the salt solution, a valve, an injector and a first concentration meter are sequentially provided on the liquid inlet pipeline; the injector is also connected to dilution water; and a second concentration meter is provided on the liquid outlet pipeline.

[0030] After the hydrochloric acid passes through the valve and the ejector in sequence and is mixed with the dilution water in the ejector, it passes through the first concentration meter and controls the mass concentration of the hydrochloric acid detected by the first concentration meter to be 3%-4%. The measured hydrochloric acid enters the cation resin regeneration tower, and the hydrochloric acid reacts with the hydrochloric acid regeneration cation resin in the cation resin regeneration tower, and ion exchange occurs to achieve the regeneration of the hydrochloric acid regeneration cation resin. The hydrochloric acid concentration in the cation resin regeneration tower is gradually consumed, and finally it is discharged from the cation resin regeneration tower after no longer reacting with the hydrochloric acid regeneration cation resin. When the hydrochloric acid passing through the second concentration meter is compared with the measured value of the first concentration meter by calculating its concentration, when the difference between the second concentration meter and the first concentration meter is ±0.1%, the treatment of the hydrochloric acid regeneration cation resin in the cation resin regeneration tower is completed.

[0031] Example 2

[0032] like Figure 1 The resin regeneration device shown includes a cationic resin regeneration tower, in which sulfuric acid is provided to regenerate the cationic resin. The cationic resin regeneration tower is provided with a liquid inlet and a liquid outlet, wherein the liquid inlet is connected to a liquid inlet pipeline, and the liquid outlet is connected to a liquid outlet pipeline. According to the liquid inlet direction of the salt solution, a valve, an injector and a first concentration meter are sequentially provided on the liquid inlet pipeline; the injector is also connected to dilution water; and a second concentration meter is provided on the liquid outlet pipeline.

[0033] After sulfuric acid passes through the valve and the ejector in sequence and is mixed with the dilution water in the ejector, it passes through the first concentration meter and controls the mass concentration of sulfuric acid detected by the first concentration meter to be 3%-4%. The measured sulfuric acid enters the cation resin regeneration tower, and the sulfuric acid reacts with the sulfuric acid regeneration cation resin in the cation resin regeneration tower, and ion exchange occurs to achieve the regeneration of the sulfuric acid regeneration cation resin. The sulfuric acid concentration in the cation resin regeneration tower is gradually consumed, and finally it is discharged from the cation resin regeneration tower after no longer reacting with the sulfuric acid regeneration cation resin. When the sulfuric acid passing through the second concentration meter is compared with the measured value of the first concentration meter by calculating its concentration, when the difference between the second concentration meter and the first concentration meter is ±0.1%, the treatment of the sulfuric acid regeneration cation resin in the cation resin regeneration tower is completed.

[0034] Example 3

[0035] like Figure 2 The resin regeneration device shown includes an anion resin regeneration tower, in which an alkali-regenerated anion resin is arranged. The anion resin regeneration tower is provided with a liquid inlet and a liquid outlet, wherein the liquid inlet is connected to a liquid inlet pipeline, and the liquid outlet is connected to a liquid outlet pipeline. According to the liquid inlet direction of the salt solution, a valve, an ejector and a first concentration meter are arranged in sequence on the liquid inlet pipeline; the ejector is also connected to water from the electric heating box; and a second concentration meter is arranged on the liquid outlet pipeline.

[0036] After the alkali solution passes through the valve and the ejector in sequence and is mixed with the dilution water in the ejector, it passes through the first concentration meter and the mass concentration of the alkali solution detected by the first concentration meter is controlled to be 3%-4%. The measured alkali solution enters the anion resin regeneration tower. The alkali solution reacts with the alkali regenerated anion resin in the anion resin regeneration tower, and ion exchange occurs to achieve the regeneration of the alkali regenerated anion resin. The concentration of the alkali solution in the anion resin regeneration tower is gradually consumed, and finally it is discharged from the anion resin regeneration tower after no longer reacting with the alkali regenerated anion resin. When the alkali solution passes through the second concentration meter, its concentration is calculated and compared with the measured value of the first concentration meter. When the difference between the second concentration meter and the first concentration meter is ±0.1%, the treatment of the alkali regenerated anion resin in the anion resin regeneration tower is completed.

[0037] In the present application, when the difference between the second concentration meter and the first concentration meter is ±0.1%, the treatment of the ion exchange resin in the resin regeneration device is completed, indicating that there is no ion replacement reaction in the cation tower and the resin regeneration has reached the end point. The present application can solve the problem of incomplete resin regeneration or excessive use of acid and alkali.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for controlling the dosage and concentration of ion exchange resin regeneration, characterized in that: The following steps are involved: A first concentration meter is added to the liquid inlet pipeline of the resin regeneration device to measure the concentration of the acid solution or the alkali solution entering the resin regeneration device; A second concentration meter is provided on the liquid outlet pipeline of the resin regeneration device for measuring the concentration of the acid solution or the alkali solution discharged from the resin regeneration device; and When the difference between the second concentration meter and the first concentration meter is ±0.1%, the treatment of the ion exchange resin in the resin regeneration device is completed.

2. The control method according to claim 1, characterized in that: The resin regeneration device includes a resin regeneration tower and the liquid inlet pipeline and the liquid outlet pipeline both connected to the resin regeneration tower; a valve and an injector are sequentially arranged on the liquid inlet pipeline according to the liquid inlet direction of the acid solution or the alkali solution; the first concentration meter is located downstream of the injector; the acid solution or the alkali solution enters the injector through a valve; and the injector is also connected to incoming water.

3. The control method according to claim 1, characterized in that: The resin regeneration tower includes a cation resin regeneration tower or an anion resin regeneration tower; the acid solution enters the cation resin regeneration tower; and the alkali solution enters the anion resin regeneration tower.

4. The control method according to claim 3, characterized in that: The cation resin regeneration tower is provided with hydrochloric acid regeneration cation resin or sulfuric acid regeneration cation resin.

5. The control method according to claim 4, characterized in that: When the hydrochloric acid regenerated cation resin is arranged in the cation resin regeneration tower, the mass concentration of the first concentration meter is 3%-4%.

6. The control method according to claim 4, characterized in that: When the cation resin regeneration tower is provided with the sulfuric acid regeneration cation resin, the mass concentration of the first concentration meter is 3%-4%.

7. The control method according to any one of claims 1 to 6, characterized in that: The mass concentration of the alkali solution is 3%-4%.

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