CN211733919U

CN211733919U - Be used for interior cold water alkalization governing system of power plant

Info

Publication number: CN211733919U
Application number: CN201922438559.3U
Authority: CN
Inventors: 何艳红; 文霞; 王鑫; 王奕
Original assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Current assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-10-23
Anticipated expiration: 2029-12-30

Abstract

The utility model provides a conditioning system for alkalifying cold water in a power plant, which comprises a pump (2), a double-layer bed or a series bed (3) of sodium type resin and oxyhydrogen type resin and a hydrogen type/oxyhydrogen type mixed bed (4); the pump (2) is connected with the sodium type resin and oxyhydrogen type resin double-layer bed or series bed (3) and the hydrogen type/oxyhydrogen type mixed bed (4) which are connected in parallel, and a valve is arranged between the pump (2) and the sodium type resin and oxyhydrogen type resin double-layer bed or series bed (3) and the hydrogen type/oxyhydrogen type mixed bed (4) which are connected in parallel to adjust the flow of the inner cooling water passing through the two resin beds. Two beds of the system adopt a parallel mode to realize the standby purification capacity, when the resin is to be replaced, the requirement of no blank period of loop purification is met, and meanwhile, once the loop water quality is abnormally polluted, the purpose of rapid and efficient purification can be realized by adopting a mixed bed. The system does not need to additionally add medicine adding equipment, simplifies the system and improves the safety and stability of system operation.

Description

Be used for interior cold water alkalization governing system of power plant

Technical Field

The utility model relates to a power plant's interior cold water system especially relates to the alkalization of interior cold water and adjusts the field.

Background

The water quality of a cold water system in a power plant and the insulation performance of a generator are closely related to the corrosion rate of a copper wire rod, and the operation safety of a unit is directly influenced by the quality of water quality control. The national standard has strict requirements on the quality of internal cooling water, and mainly comprises pH value, conductivity and copper content, the GB/T1039-.

The typical internal cooling water treatment schemes in the industry are three:

1. the hydrogen type/oxyhydrogen type mixed bed is directly adopted to purify the inner cooling water, the exchange mechanism of the hydrogen type/oxyhydrogen type mixed bed is to exchange impurity cations into hydrogen ions and exchange impurity anions into hydroxide ions, the effluent is pure water, the typical effluent quality is pH range 6.5-7.5, the conductivity is less than 0.1 mu s/cm (25 ℃), and the control mode can maintain extremely low impurity ion content in the inner cooling water, but can not maintain the pH value to be more than 8, thus being unfavorable to corrosion of copper bars;

2. the water quality index of the inner cooling water loop is adjusted by adopting a mixed bed purification and direct alkaline solution adding mode, although the pH value of the loop can be adjusted, the risk of bringing other impurities into the loop due to the need of additionally adding alkali is also required, and in addition, an alkali adding device is also required to be matched, so that once the problem of an alkali adding procedure occurs, the risk of bringing a large amount of sodium hydroxide into a system is also caused;

3. adopt the mode of sodium bed and anion bed parallel operation, through adjusting the valve aperture regulation circuit conductivity and pH value of two beds, this scheme can adjust return circuit quality of water to the target value, also need not additionally to add charge device, but if need change the resin, the bed body need be shut down the fortune, exists and purifies the blank period, or when the return circuit quality of water appears unusually, does not possess the ability of quick purification return circuit quality of water, is unfavorable for system safety and stability operation.

By integrating the internal cooling water purification and water quality regulation schemes in the industry, how to realize the purposes of effectively purifying the water quality of the loop, regulating the water chemical parameters of the loop to a target value to meet the national standard requirement, simplifying the system and providing means to ensure the long-term safe and stable operation of the system becomes the key target of the patent.

Disclosure of Invention

The invention discloses an alkalization adjusting system for power plant internal cooling water, which mainly solves the following three key technical problems: the problem that the water quality of a loop cannot meet the national standard requirement and is not beneficial to corrosion of a copper wire rod due to the traditional single mixed bed purification is solved; the problem that the system is too complex and has pollution risk due to the fact that the water quality of a loop is adjusted by adding drugs is solved; the method solves the potential problems that the system purification has a blank period due to the parallel connection of a sodium bed and a anion bed and the loop water does not have the rapid purification capability.

The system comprises a pump (2), a double-layer bed or a series bed (3) of sodium type resin and oxyhydrogen type resin and a hydrogen type/oxyhydrogen type mixed bed (4); the pump (2) is connected with the sodium type resin and oxyhydrogen type resin double-layer bed or series bed (3) and the hydrogen type/oxyhydrogen type mixed bed (4) which are connected in parallel, and a valve is arranged between the pump (2) and the sodium type resin and oxyhydrogen type resin double-layer bed or series bed (3) and the hydrogen type/oxyhydrogen type mixed bed (4) which are connected in parallel to adjust the flow of the inner cooling water passing through the two resin beds.

Preferably, the purification flow rate of the sodium resin and oxyhydrogen resin double-layer bed or the series bed (3) is 5-50 BV/h, and the purification flow rate of the hydrogen/oxyhydrogen mixed bed (4) is 5-120 BV/h.

Preferably, the sodium-type resin layer of the sodium-type resin and oxyhydrogen-type resin double-layer bed or the tandem bed (3) is 300-1500 mm high, and the oxyhydrogen-type resin layer is 300-1500 mm high.

Preferably, the height of the resin layer of the hydrogen/hydrogen-oxygen type mixed bed (4) is 500-2000 mm.

Preferably, a conductivity meter and a pH meter are connected behind the pump (2), and the opening degree of a valve is adjusted through the data of the conductivity meter and the pH meter.

The invention provides a power plant inner cooling water alkalization adjusting system which is characterized in that:

1. the sodium resin and the hydroxide resin adopt a double-bed or series bed mode, trace sodium ions are released by impurity cations and hydrolysis in a sodium resin exchange loop, and then the hydroxide ions are released by trace impurity anions in a lower layer or a downstream anion exchange loop to form trace sodium hydroxide for adjusting the pH value of the loop with the sodium ions, so that the pH value of the loop is adjusted while the water quality of the loop is purified;

2. the hydrogen type/oxyhydrogen type resin adopts a mixed bed filling mode which is most beneficial to ion exchange, realizes the purpose of deeply purifying partial loop water, and realizes the removal of other impurity ions while the pH value of the inner cooling water loop is improved by adjusting the flow distribution of the two beds;

3. the two beds adopt a parallel mode to realize the standby purification capacity, meet the requirement that the loop purification has no blank period when the resin is to be replaced, and simultaneously, in case of abnormal water pollution of the loop, can adopt a mixed bed to realize the purpose of rapid and efficient purification.

4. The device and the system do not need to additionally add medicine adding equipment, the system is simplified, and the safety and the stability of system operation are improved.

Drawings

FIG. 1 is a schematic diagram of a system for adjusting alkalization of cooling water in a power plant;

wherein: 1: inner cooling water; 2: a pump; 3: sodium oxyhydrogen double-layer bed or series bed; 4: mixed bed of hydrogen form/oxyhydrogen form.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

As shown in figure 1, the system for adjusting the alkalinity of the cold water in the power plant comprises a pump, a double-layer bed or a series bed of sodium-type resin and oxyhydrogen-type resin (300-1500 mm of sodium-type resin and 300-1500 mm of oxyhydrogen-type resin), a hydrogen-type/oxyhydrogen-type mixed bed (500-2000 mm of the height of a resin layer of the mixed bed), an online conductivity meter, an online pH meter, a matched pipeline and a valve.

When the internal cooling water system is conventionally purified, pumping the internal cooling water into the sodium type resin and oxyhydrogen type resin double-layer bed or the series bed and the hydrogen type/oxyhydrogen type mixed bed which are connected in parallel through the pump, adjusting the purification flow of the two resin beds, wherein the purification flow of the sodium type resin and oxyhydrogen type resin double-layer bed or the series bed is 5-50 BV/h, the purification flow of the hydrogen type/oxyhydrogen type mixed bed is 5-120 BV/h, and returning the produced water to the internal cooling water loop.

When the resin needs to be replaced in the internal cooling water system, the resin beds to be replaced are bypassed, and resin replacement operation is carried out, because each bed has the positive resin and the negative resin, and the impurity cations to be removed in the loop are mainly corrosion product copper ions, any bed can normally purify loop water.

When the loop water is abnormally polluted by an external water source, the sodium type hydrogen-oxygen double-layer bed or the series bed is bypassed, the hydrogen type/hydrogen-oxygen mixed bed is adopted, the flow speed is increased to about 120BV/h, the loop can be quickly purified, and the problems of corrosion, impurity deposition and the like caused by the fact that the loop equipment is polluted by the abnormally invaded impurities are prevented.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims

1. A system for adjusting the alkalinity of cold water in a power plant is characterized by comprising a pump (2), a double-layer bed or a series bed (3) of sodium type resin and oxyhydrogen type resin and a hydrogen type/oxyhydrogen type mixed bed (4);

the pump (2) is connected with the sodium type resin and oxyhydrogen type resin double-layer bed or series bed (3) and the hydrogen type/oxyhydrogen type mixed bed (4) which are connected in parallel, and a valve is arranged between the pump (2) and the sodium type resin and oxyhydrogen type resin double-layer bed or series bed (3) and the hydrogen type/oxyhydrogen type mixed bed (4) which are connected in parallel to adjust the flow of the inner cooling water passing through the two resin beds.

2. The system for adjusting alkalinity of cooling water in power plants according to claim 1, wherein the purifying flow rate of the double-layer bed or the series bed (3) of sodium-type resin and oxyhydrogen-type resin is 5-50 BV/h, and the purifying flow rate of the hydrogen-type/oxyhydrogen-type mixed bed (4) is 5-120 BV/h.

3. The alkalinity adjustment system for the cooling water in the power plant as claimed in claim 1, wherein the sodium-type resin and hydrogen-oxygen type resin double bed or series bed (3) has a sodium-type resin layer height of 300-1500 mm and a hydrogen-oxygen type resin layer height of 300-1500 mm.

4. The system for adjusting alkalinity of cooling water in power plants according to claim 1, wherein the resin layer of the hydrogen/oxygen/hydrogen mixed bed (4) is 500-2000 mm high.

5. The system for adjusting the alkalinity of cooling water in power plants according to claim 1, characterized in that an electrical conductivity meter and a pH meter are connected after the pump (2), and the opening degree of the valve is adjusted by the data of the electrical conductivity meter and the pH meter.