Chemical dosing system for main steam humidity test and using method thereof

A technology of humidity test and dosing system, applied in the field of main steam system, can solve the problem that chemical tracer is not suitable for dosing device to measure the humidity of main steam, and achieve the effect of eliminating influence and accurate measurement and calculation

Pending Publication Date: 2021-01-08
SANMEN NUCLEAR POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies in the prior art and provide a chemical dosing system for the main steam humidity test to solve the problem of using chemical tracers in the main steam system to measure the humidity of the main steam in the prior art without a suitable dosing device The problem

Method used

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  • Chemical dosing system for main steam humidity test and using method thereof

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Effect test

Embodiment 1

[0035] A chemical dosing system for the main steam humidity test, the chemical dosing system for the main steam humidity test includes a self-circulating closed pipeline, a dosing pipeline, and a sewage pipeline, wherein the self-circulating closed pipeline includes sequentially connected dosing boxes 1. Dosing box outlet isolation valve 2, pneumatic pump 3, pump outlet isolation valve 4, safety valve 5, pressure gauge behind the pump 6, self-circulation isolation valve 7, wherein the pneumatic pump 3 is connected to the high-pressure cylinder 31 through a pipeline , and between the high-pressure gas cylinder 31 and the pneumatic pump 3, a gas cylinder outlet isolation valve 32, a pressure reducing valve 33, and a pressure gauge 34 before the pump are arranged in sequence; Between the self-circulation isolation valve 7 and the pressure gauge 6 behind the pump, a drug addition isolation valve 8 is provided on the drug addition pipeline, and a sewage discharge isolation valve 9 i...

Embodiment 2

[0037] A chemical dosing system for the main steam humidity test, the chemical dosing system for the main steam humidity test includes a self-circulating closed pipeline, a dosing pipeline, and a sewage pipeline, wherein the self-circulating closed pipeline includes sequentially connected dosing boxes 1. Dosing box outlet isolation valve 2, pneumatic pump 3, pump outlet isolation valve 4, safety valve 5, pressure gauge behind the pump 6, self-circulation isolation valve 7, wherein the pneumatic pump 3 is connected to the high-pressure cylinder 31 through a pipeline , and between the high-pressure gas cylinder 31 and the pneumatic pump 3, a gas cylinder outlet isolation valve 32, a pressure reducing valve 33, and a pressure gauge 34 before the pump are arranged in sequence; Between the self-circulation isolation valve 7 and the pressure gauge 6 behind the pump, a drug addition isolation valve 8 is provided on the drug addition pipeline, and a sewage discharge isolation valve 9 i...

Embodiment 3

[0039] A method for using a chemical dosing system for a main steam humidity test, comprising the following steps:

[0040] (1) Flushing before dosing: inject desalinated water into the dosing box 1, and the sewage pipeline is connected to the sewage tank; open the outlet isolation valve 2 of the dosing box, the pump outlet isolation valve 4, and the self-circulation isolation valve 7, and close the sewage isolation Valve 9, dosing isolation valve 8, adjust the air pressure of the high-pressure gas cylinder 31 so that the gauge pressure of the pressure gauge in front of the pump is 0.30 MPa, start the pneumatic pump 3 for self-circulation; after 3 minutes of circulation, open the sewage isolation valve 9, and close the self-circulation isolation valve 7; repeat the above operation 3 times, shut down the pneumatic pump;

[0041] (2) Dosing operation: connect the dosing pipeline to the dosing point, open the upstream valve of the main steam system; add tracer and 10L desalted wa...

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Abstract

The invention belongs to the field of main steam systems, and particularly discloses a dosing system for a main steam humidity test and a using method thereof. The invention provides a dosing system for a main steam humidity test, which comprises a self-circulation closed pipeline, a dosing pipeline and a blow-off pipeline. The self-circulation closed pipeline comprises a dosing box, a dosing boxoutlet isolation valve, a pneumatic pump, a pump outlet isolation valve, a safety valve, a post-pump pressure gauge and a self-circulation isolation valve which are connected end to end in sequence. When the dosing system for the main steam humidity test is used, the steps of flushing before dosing, dosing operation and the like are included. According to the invention, the mobile dosing system comprising the self-circulation closed pipeline, the dosing pipeline and the blow-off pipeline is utilized to realize injection of a chemical tracer in a main steam humidity test; and the self-circulation isolation valve is arranged, the self-circulation isolation valve is opened and closed, and the two steps of internal flushing and dosing operation before dosing of the dosing system are achieved.

Description

technical field [0001] The invention belongs to the field of main steam systems, in particular to a chemical dosing system for main steam humidity test and its application method. Background technique [0002] The pressurized water reactor nuclear power plant generates the main steam through the steam generator, which is used for the steam turbine to do work. The actual outlet steam will carry a very small amount of moisture, and the existence of moisture in the steam will not only affect the safety of the turbine blades, but also reduce the thermal efficiency of the unit. Therefore, nuclear power plants strictly control the humidity of the outlet steam of the steam generator. The quality of main steam is of great significance to the safe and economical operation of nuclear power units, and the humidity is an important indicator for nuclear island performance acceptance. At present, the main steam humidity measurement mainly includes tracer method (radioactive and non-radio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G21C17/00
CPCG01N33/0004G21C17/00Y02E30/30
Inventor 侯涛聂雪超姜磊吴旭东吕盛王雄李河洋刘鹏
Owner SANMEN NUCLEAR POWER CO LTD
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