A method and system for reducing gas sampling waste gas emissions in a high-temperature gas-cooled reactor nuclear power plant

By adding a return line to the sampling pipeline system of a high-temperature gas-cooled reactor nuclear power plant and accelerating the gas sample flow rate, the problem of large waste gas emissions during the gas sampling process was solved, the gas sample was able to reach the analytical instrument quickly, and the cost of radioactive treatment was reduced.

CN115497648BActive Publication Date: 2025-09-12HUANENG NUCLEAR ENERGY TECH RES INST CO LTD +1
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Patent Information

Application Number
CN202211193519.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-28
Publication Date
2025-09-12
Estimated Expiration
2042-09-28

AI Technical Summary

Technical Problem

In high-temperature gas-cooled reactor nuclear power plants, large amounts of waste gas are emitted during the gas sampling process. Due to the long sampling time, the gas samples cannot be recovered, which increases the cost of radioactive treatment. In addition, the existing pipelines cannot be easily replaced to shorten the sampling time.

Method used

A return line is added to the sampling pipeline system, and by accelerating the gas sample flow rate and accurately controlling the opening and closing of valves, the circulation time of gas samples in different pressure sections is shortened and exhaust gas emissions are reduced.

Benefits of technology

By accelerating the gas sample flow rate and precisely controlling it, the time it takes for the gas sample to reach the analytical instrument is significantly shortened, waste gas emissions are reduced, and the cost of radioactive treatment is lowered.

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Abstract

The present invention discloses a method for reducing gas sampling waste gas emissions in a high-temperature gas-cooled reactor nuclear power plant, comprising: S1, establishing a multi-stage pressure-reducing sampling pipeline system, and establishing a gas sample return pipeline between a 7MPa pipeline section and a process pipeline in the sampling pipeline system; S2, accelerating the gas sample flow rate in the return pipeline to increase the gas sample flow rate within the 7MPa pipeline section of the sampling pipeline system and shorten the gas sample circulation time within the 7MPa pipeline section; S3, measuring or calculating the gas sample flow rate within the 7MPa pipeline section, the 0.25MPa pipeline section, and the 0.1MPa pipeline section of the sampling pipeline system, and obtaining a sampling set time based on the flow rate measurement and evaluation results; S4, performing a gas sampling operation and opening and closing various valve groups on the sampling pipeline system and the return pipeline system according to the sampling set time. This invention can significantly reduce the time it takes for the gas sample to reach the analyzer from the sampling point, thereby reducing the amount of waste gas discharged by the system during gas sampling by shortening the emission time.
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