Mixed ion exchange resin for phase modifier rotor inner cooling water and its preparation method

Abstract

The application discloses a mixed ion exchange resin for phase modifier rotor inner cooling water and a preparation method thereof. The mixed ion exchange resin is composed of anion and cation exchange resins, specifically hydrogen-oxygen type, hydrogen type and sodium type ion exchange resins, and the volume ratio is 12-13:2-3:1. The preparation method comprises the following steps: converting the anion and cation exchange resins into sulfuric acid type and hydrogen type ion exchange resins respectively, mixing the sulfuric acid type and part of the hydrogen type ion exchange resins, converting the mixed ion exchange resins into hydrogen-oxygen type and sodium type mixed ion exchange resins, mixing the hydrogen-oxygen type and sodium type mixed ion exchange resins with the other part of the hydrogen type ion exchange resins, and obtaining the target mixed ion exchange resin. The three types of ion exchange resins in the mixed ion exchange resin can be simultaneously disabled, the utilization rate of the ion exchange resin is maximized, the service life is effectively prolonged, the preparation process effectively avoids the problem of poor uniformity by using the similar density of the sulfuric acid type and hydrogen type ion exchange resins, and the service life of the resin and the water quality are ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of phase modifier cooling water treatment, and particularly relates to a special ion exchange resin for phase modifier rotor internal cooling water and a preparation method thereof. BACKGROUND

[0002] As a rotating reactive power generating device, the phase modifier enters a phase operation state when the DC system is blocked due to a fault, absorbs reactive power, suppresses the voltage rise, and improves the voltage level, which plays an important role in supporting the stability of the power grid system. A large number of double-water-cooled phase modifiers are constructed in the DC transmission end of State Grid. A large amount of heat generated during the operation of the phase modifier needs to be taken away by the cooling system. Unqualified water quality will accelerate the corrosion of the phase modifier coil, produce copper oxide deposition, cause the heat transfer efficiency of the internal cooling water pipe to decrease, and make the coil prone to blockage, which seriously threatens the safe operation of the unit. Therefore, the water quality needs to be adjusted to ensure that the cooling water quality meets the requirements.

[0003] The rotor internal cooling water of the phase modifier requires a pH value of 7-9, a copper ion content of less than 40 μg / L (an expected value of 20 μg / L), and an electrical conductivity of less than 5.0 μS / cm. To ensure the above water quality requirements, the most widely used and effective method for the rotor internal cooling water of the phase modifier is to adjust the pH of the rotor internal cooling water by adding alkali, to remove copper ions, dissolved impurities, and ion impurities generated by the addition of alkali to ensure the electrical conductivity of the rotor internal cooling water. Currently, the ion exchange resins used are conventional mixed bed ion exchange resins, i.e., the treatment capacity of the anion and cation resins is 1:1, which can ensure that the water quality is less than 0.08 μS / cm. However, due to the dissolution of a large amount of carbon dioxide during the operation of the rotor, the use of conventional mixed bed ion exchange resins makes the anion and cation resins unable to fail at the same time, and there is often a situation that the anion resin fails first, while most of the cation resin has not failed, which eventually leads to a very short service life of the ion exchange resin and high operation and maintenance costs. Some scholars refer to the generator stator internal cooling water treatment process and propose to use three ion exchange resin tanks composed of sodium, hydrogen, and hydrogen-oxygen resins to adjust the pH by sodium resin and remove impurities by hydrogen and hydrogen-oxygen resins to ensure the water quality of the rotor internal cooling water of the phase modifier. However, this method also has the problems of too short service life of the ion exchange resin due to the dissolution of a large amount of carbon dioxide and unsatisfactory water quality once the resin partially fails. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a mixed ion exchange resin for the rotor internal cooling water of the phase modifier and a preparation method thereof, which has a long service life and good water quality.

[0005] To solve the above technical problems, the application adopts the following technical solutions.

[0006] A mixed ion exchange resin for phase modifier rotor internal cooling water is formed by mixing an anion exchange resin and a cation exchange resin, the anion exchange resin is a hydroxyl type ion exchange resin, the cation exchange resin includes a hydrogen type ion exchange resin and a sodium type ion exchange resin, and the volume ratio of the hydroxyl type ion exchange resin, the hydrogen type ion exchange resin and the sodium type ion exchange resin is 12-13:2-3:1.

[0007] Preferably, the mixed ion exchange resin for phase modifier rotor internal cooling water is installed in a mixed bed, and the conductivity of the outlet water of the mixed bed is 0.1-0.5 μS / cm.

[0008] Preferably, the anion exchange resin is a gel type anion exchange resin, the cation exchange resin is a gel type cation exchange resin, and the performance of the gel type anion exchange resin and the gel type cation exchange resin meets the technical requirements of GB / T 32473-2016 ion exchange resin for condensate polishing.

[0009] As a general technical concept, the application also provides a preparation method of the mixed ion exchange resin for phase modifier rotor internal cooling water, which comprises the following steps:

[0010] (1) converting the anion exchange resin into a sulfuric acid type ion exchange resin by using a sodium sulfate solution, and converting the cation exchange resin into a hydrogen type ion exchange resin by using hydrochloric acid;

[0011] (2) uniformly mixing the sulfuric acid type ion exchange resin and part of the hydrogen type ion exchange resin to obtain a mixed ion exchange resin of the sulfuric acid type and the hydrogen type, wherein the volume ratio of the sulfuric acid type ion exchange resin to the hydrogen type ion exchange resin is 12-13:1;

[0012] (3) converting the mixed ion exchange resin of the sulfuric acid type and the hydrogen type by using a NaOH solution to obtain a mixed resin of a hydroxyl type anion exchange resin and a sodium type cation exchange resin;

[0013] (4) uniformly mixing another part of the hydrogen type ion exchange resin obtained in step (1) with the mixed resin of the hydroxyl type anion exchange resin and the sodium type cation exchange resin obtained in step (3), wherein the volume ratio of the hydrogen type ion exchange resin to the mixed resin is 2-3:13-14, to obtain the mixed ion exchange resin for phase modifier rotor internal cooling water.

[0014] The preparation method of the mixed ion exchange resin for the phase modifier rotor inner cooling water, preferably, in step (1), the initial anion exchange resin is a chloride type anion exchange resin, and the initial cation exchange resin is a sodium type cation exchange resin.

[0015] The preparation method of the mixed ion exchange resin for the phase modifier rotor inner cooling water, preferably, in step (1), the initial anion exchange resin is a chloride type anion exchange resin, and the initial cation exchange resin is a sodium type cation exchange resin.

[0016] The preparation method of the mixed ion exchange resin for the phase modifier rotor inner cooling water, preferably, in step (2), the mixing is water-air mixing.

[0017] The preparation method of the mixed ion exchange resin for the phase modifier rotor inner cooling water, preferably, in step (4), the mixing is water-air mixing.

[0018] The preparation method of the mixed ion exchange resin for the phase modifier rotor inner cooling water, preferably, in step (1), the concentration of the sodium sulfate solution is 20g / L-25g / L, and the mass concentration of the hydrochloric acid is 3%-5%.

[0019] The preparation method of the mixed ion exchange resin for the phase modifier rotor inner cooling water, preferably, in step (3), the concentration of the NaOH solution is 3%-5%.

[0020] Compared with the prior art, the preparation method of the mixed ion exchange resin for the phase modifier rotor inner cooling water has the following advantages:

[0021] 1. The mixed ion exchange resin for the phase modifier rotor inner cooling water is composed of hydrogen-oxygen type ion exchange resin, hydrogen type ion exchange resin and sodium type ion exchange resin, can be installed in a mixed bed, and the volume ratio is 12-13:2-3:1. The ion exchange resin ratio has the following advantages: (1) when treating the phase modifier rotor inner cooling water, the three types of ion exchange resins in the ion exchange resin mixed bed are simultaneously invalid, which avoids the situation that the mixed bed is invalid due to the invalidation of one type of ion exchange resin in the ion exchange resin, maximizes the utilization rate of the ion exchange resin, and effectively prolongs the service life of the ion exchange resin; (2) the mixed bed composed of the three types of ion exchange resins guarantees that the water quality meets the requirements due to the existence of the hydrogen type and hydrogen-oxygen type ion exchange resins, effectively and completely removes anions such as carbon dioxide, bicarbonate ions and carbonate ions, and a large part of sodium ions, and the existence of a small part of sodium type ion exchange resins effectively reduces the addition of lye and the burden of the hydrogen type ion exchange resin, thereby prolonging the service life of the ion exchange resin. According to the water quality characteristics of the rotor inner cooling water, the present application specially matches different types of ion exchange resins, and obtains a mixed ion exchange resin with long service life and good water quality.

[0022] 2、The preparation method of the application mixes the cation exchange resin and the hydrogen type ion exchange resin first, then converts the sulfuric acid type ion exchange resin and part of the hydrogen type ion exchange resin into the hydroxyl type ion exchange resin and the sodium type ion exchange resin by sodium hydroxide, and finally mixes the other part of the hydrogen type ion exchange resin into the hydroxyl type ion exchange resin and the sodium type ion exchange resin, which effectively utilizes the similar density of the sulfuric acid type ion exchange resin and the hydrogen type ion exchange resin, effectively avoids the problem of poor uniformity in the mixed bed caused by the density difference of the three ion exchange resins, and effectively guarantees the service life of the resin and the water quality. DETAILED DESCRIPTION

[0023] The application will be further described below in combination with specific preferred embodiments, but the protection scope of the application is not limited by the following embodiments. The materials and instruments used in the following embodiments are commercially available.

[0024] Example 1

[0025] The mixed ion exchange resin for the phase modifier rotor inner cooling water of the application is composed of a mixed bed of anion exchange resin and cation exchange resin, the anion exchange resin is the hydroxyl type ion exchange resin, the cation exchange resin includes the hydrogen type ion exchange resin and the sodium type ion exchange resin, and the volume ratio of the hydroxyl type ion exchange resin, the hydrogen type ion exchange resin and the sodium type ion exchange resin is 12:2:1.

[0026] In this embodiment, the mixed ion exchange resin for the phase modifier rotor inner cooling water is installed in the mixed bed, so that the conductivity of the mixed bed outlet water is 0.1 μS / cm-0.5 μS / cm.

[0027] In this embodiment, the anion exchange resin is a gel type anion exchange resin, and the cation exchange resin is a gel type cation exchange resin, and the performance of the gel type anion exchange resin and the gel type cation exchange resin meets the technical requirements of GB / T32473 ion exchange resin for condensed water fine treatment.

[0028] The preparation method of the mixed ion exchange resin for the phase modifier rotor inner cooling water of the application includes the following steps:

[0029] (1) 480L 201MBP gel type (chlorine type) anion exchange resin is cleaned and converted into sulfuric acid type ion exchange resin by sodium sulfate solution, and 120L 201MBP gel type (sodium type) cation exchange resin is cleaned and converted into hydrogen type ion exchange resin by hydrochloric acid; wherein the concentration of the sodium sulfate solution is 22g / L, and the mass concentration of the hydrochloric acid is 4%;

[0030] (2) Mix 480L of the sulfuric acid type ion exchange resin from step (1) with 40L of the hydrogen type ion exchange resin (preferably air mixing, which is a conventional technique) to obtain a mixed ion exchange resin of the sulfuric acid type and the hydrogen type;

[0031] (3) Transform the 520L of the mixed ion exchange resin of the sulfuric acid type and the hydrogen type obtained in step (2) with a sodium hydroxide solution to obtain a mixed resin of the hydroxyl type anion exchange resin and the sodium type cation exchange resin (i.e. a mixed ion exchange resin of the hydroxyl type and the sodium type); wherein the concentration of the sodium hydroxide solution is 4%;

[0032] (4) Mix 80L of the hydrogen type ion exchange resin from step (1) with the 520L of the mixed ion exchange resin of the hydroxyl type and the sodium type obtained in step (3) (preferably air mixing) to obtain the mixed ion exchange resin for the phase modifier rotor inner cooling water.

[0033] The mixed ion exchange resin for the phase modifier rotor inner cooling water obtained in the above embodiment is applied to the phase modifier rotor inner cooling water treatment, and the service life of the ion exchange resin is 1.5 to 2 years under the condition that the pH value of the rotor inner cooling water is controlled to be 7 to 9, the copper ion content is less than 20 μg / L, and the conductivity is less than 5.0 μS / cm. However, the service life of the mixed ion exchange resin composed of the hydroxyl type and the hydrogen type ion exchange resin in a volume ratio of 2:1 is less than 4 months under the same water quality condition. The sodium type ion exchange resin cannot continue to control the water quality in less than 1 month under the condition that the sodium type, the hydrogen type and the hydroxyl type ion exchange resin are treated in a three-tank form without adding alkali. The service life of the hydrogen type and the hydroxyl type is also less than 3 months under the condition that the alkali is added.

[0034] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present application, or modify it into equivalent embodiments with equivalent changes, without departing from the spirit and technical solution of the present application. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiment according to the technical essence of the present application, all still belong to the protection scope of the technical solution of the present application.

Claims

1. A method for preparing a mixed ion exchange resin for cooling water in a phase shifter rotor, characterized in that: The following steps are involved: (1) The anion exchange resin is converted into a sulfate-type ion exchange resin using sodium sulfate solution, and the cation exchange resin is converted into a hydrogen-type ion exchange resin using hydrochloric acid; (2) mixing a sulfuric acid type ion exchange resin and a portion of a hydrogen type ion exchange resin to obtain a sulfuric acid type and hydrogen type mixed ion exchange resin; wherein the volume ratio of the sulfuric acid type ion exchange resin to the hydrogen type ion exchange resin is 12 to 13:1; (3) transforming the above-mentioned sulfuric acid type and hydrogen type mixed ion exchange resin using NaOH solution to obtain a mixed resin of hydroxide type anion exchange resin and sodium type cation exchange resin; (4) uniformly mixing the other portion of the hydrogen-type ion exchange resin obtained in step (1) with the mixed resin of the hydroxide-type anion exchange resin and the sodium-type cation exchange resin obtained in step (3), wherein the volume ratio of the hydrogen-type ion exchange resin to the mixed resin is 2-3:13-14, to obtain a mixed ion exchange resin for cooling water in the phase shifter rotor; The mixed ion exchange resin for cooling water in the phase shifter rotor is formed by mixing anion exchange resin and cation exchange resin. The anion exchange resin in the mixed ion exchange resin for cooling water in the phase shifter rotor is a hydroxide type ion exchange resin. The cation exchange resin in the mixed ion exchange resin for cooling water in the phase shifter rotor includes a hydrogen type ion exchange resin and a sodium type ion exchange resin. The volume ratio of the hydroxide type ion exchange resin, the hydrogen type ion exchange resin and the sodium type ion exchange resin is 12 to 13:2 to 3:

1.

2. The method for preparing a mixed ion exchange resin for cooling water in a phase condenser rotor according to claim 1, characterized in that: In step (1), the anion exchange resin is a chloride-type anion exchange resin, and the cation exchange resin is a sodium-type cation exchange resin.

3. The method for preparing a mixed ion exchange resin for cooling water in a phase condenser rotor according to claim 1, characterized in that: In step (1), the anion exchange resin is pre-treated by cleaning before being converted with a sodium sulfate solution, and the cation exchange resin is pre-treated by cleaning before being converted with an HCl solution.

4. The method for preparing a mixed ion exchange resin for cooling water in a phase condenser rotor according to any one of claims 1 to 3, characterized in that: In step (2), the mixing is water-gas mixing.

5. The method for preparing a mixed ion exchange resin for cooling water in a phase condenser rotor according to any one of claims 1 to 3, characterized in that: In step (4), the mixing is water-gas mixing.

6. The method for preparing a mixed ion exchange resin for cooling water in a phase condenser rotor according to any one of claims 1 to 3, characterized in that: In step (1), the concentration of the sodium sulfate solution is 20 g / L to 25 g / L, and the mass concentration of the hydrochloric acid is 3% to 5%.

7. The method for preparing a mixed ion exchange resin for cooling water in a phase condenser rotor according to any one of claims 1 to 3, characterized in that: In step (3), the concentration of the NaOH solution is 3% to 5%.

8. The method for preparing a mixed ion exchange resin for cooling water in a phase condenser rotor according to any one of claims 1 to 3, characterized in that: The mixed ion exchange resin for cooling water in the phase shifter rotor is installed in the mixed bed, so that the conductivity of the water discharged from the mixed bed is 0.1μS / cm to 0.5μS / cm.

9. The method for preparing a mixed ion exchange resin for cooling water in a phase condenser rotor according to any one of claims 1 to 3, characterized in that: The anion exchange resin in the mixed ion exchange resin for cooling water in the phase shifter rotor is a gel-type anion exchange resin, and the cation exchange resin in the mixed ion exchange resin for cooling water in the phase shifter rotor is a gel-type cation exchange resin. The performance of the gel-type anion exchange resin and the gel-type cation exchange resin meets the technical requirements of GB / T 32473-2016 ion exchange resin for condensate polishing treatment.