On-line leakage detecting method of gas cutting-off system

Abstract

The invention provides an on-line leakage detecting method of a gas cutting-off system. A pressure switch is arranged on a gas pipeline between an electric butterfly valve and an electric glass valve; the electric butterfly valve is connected with a bypass solenoid valve in parallel through gas path; an exhaust solenoid valve is connected on the pipeline between the electric butterfly valve and the pressure switch; the other end of the exhaust solenoid valve is communicated with air. By adopting the method provided by the invention, the leakage of the electric butterfly valve and the electricglass valve is detected on line and judged when the gas is cut off by the gas cutting-off system; the installation is easy and convenient, the operation is reliable, and the detection and judgment are exact and in time. In the detection process, the internal leakage (leakage of the electric butterfly valve) and the external leakage (the leakage of the electric glass valve) of the gas cutting-off system are detected and judged exactly. The problems that the traditional gas cutting-off system cannot detect and judge the leakage on line are solved effectively. In this way, the method of the invention is helpful to reduce the safety accident incidence and improve the production efficiency in metallurgical enterprises.

Description

technical field [0001] The invention relates to an electrical instrument control of a gas cut-off system in a gas pipeline network in the metallurgical industry, in particular to an online leak detection method for the gas cut-off system. Background technique [0002] A gas cut-off system must be installed at the gas inlet of the gas user or the equipment that needs to be overhauled. Once the gas user stops using the gas or the equipment needs to be shut down for maintenance, the gas cut-off system will cut off the gas, and the gas pipeline or equipment downstream of the gas cut-off system The gas is purged and replaced with compressed air or nitrogen, so that there is no more gas downstream of the gas cut-off system. In order to check whether there is leakage in the gas cut-off system, the traditional method is to install an analysis sampling valve on the pipeline between the electric butterfly valve and the electric glasses valve, and regularly take samples manually on sit...

AI Technical Summary

Problems solved by technology

Therefore, the traditional gas cut-off system has three shortcomings. First, it is impossible to judge the leakage of the gas cut-off system (electric glasses valve). Second, it is not timely to detect and judge the internal leakage of the gas cut-off system (electric butterfly valve). Third, workers High labor intensity and low production efficiency

Once the gas cut-off system leaks and cannot be detected in time, it will cause gas poisoning to the staff in the gas leakage area, and even cause a gas explosion accident

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