Nuclear power plant buried hydrogen pipeline leakage monitoring system and method

Abstract

The invention relates to a nuclear power plant buried hydrogen pipeline leakage monitoring system and method. The system comprises a sleeve, hydrogen concentration probes and a control unit. A hydrogen pipeline is arranged in the sleeve, the sleeve and the hydrogen pipeline form a closed space, vertical pipes are arranged on the sleeve and arranged at the two ends of the sleeve, and the hydrogen concentration probes are arranged at the upper ends of the vertical pipes and connected with the control unit. The method comprises the steps of acquiring the time difference of trigger alarms of the two hydrogen concentration probes; acquiring the gas flow rates detected by two gas flow rate sensors; preliminary positioning a leakage point, and determining a leakage section; and positioning the leakage point. The nuclear power plant buried hydrogen pipeline leakage monitoring system and method have the advantages that the leakage point can be accurately positioned, the requirement for the leakproofness of the glass fiber reinforced plastic sleeve is not high, and even though the glass fiber reinforced plastic sleeve is broken, monitoring of hydrogen pipeline leakage is not affected; and no fear that water enters the glass fiber reinforced plastic sleeve exists, a series of facilities such as a hydrogen sampling pipeline and a sampling pump are reduced, faults of an analysis instrument are dispersed to all measuring point instruments, and the reliability is improved.

Description

technical field [0001] The invention relates to the field of gas leakage detection, in particular to a system and method for monitoring the leakage of buried hydrogen pipelines in nuclear power plants. Background technique [0002] Part of the process of the nuclear power plant requires the participation of high-pressure hydrogen, so a hydrogen supply station sub-item is built as a supporting component. The hydrogen supply pipeline is directly buried underground before entering the steam turbine of the nuclear power plant or the nuclear island building. Considering that hydrogen is a flammable and explosive gas, it is necessary to monitor the leakage of buried hydrogen pipelines. [0003] There are two main monitoring methods currently used in nuclear power. One is to cover the buried hydrogen pipeline with a closed FRP casing, and fill the closed casing with nitrogen, and monitor the leakage of the hydrogen pipeline through a pressure gauge. Once the hydrogen pipeline leak...

AI Technical Summary

Problems solved by technology

[0004] The first type of airtight casing can only detect hydrogen leakage, but cannot locate it. At the same time, once the airtight fiberglass casing is cracked in the ground, the monitoring ability will be completely lost.

[0005] Although the second type can realize monitoring and preliminary positioning, since both ends of the casing must be opened for pumping, in practical applications, due to water entering the casing (or casing cracking in rainy days), the pumping will be accompanied by water vapor and cause the hydrogen monitoring device to fail. Frequent and unreasonable alarm

At the same time, this solution requires more pipelines and equipment, which is not conducive to investment and equipment operation and maintenance.

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