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Optimization of gas detection and alarm instrument networks at gas gathering station based on CFD
ZHANG Bo1, CHEN Guo ming1, GONG Jin hai2, WANG Yong2
(1.Centre for Offshore Engineering and Safety Technology, China University of Petroleum, Dongying 257061, China;2.Petroleum Prospecting and Design Institute, Zhongyuan Petroleum Exploration Bureau, Puyang 457001, China)
Abstract:
The method of gas detection and alarm instrument networks optimization was presented. Then, a CFD model for natural gas leakage in a gas gathering station of a high sulfide gas field was set up and the gas detection and alarm instruments were set up as monitoring points. The methane and hydrogen sulfide volume fractions of monitoring points were recorded by the simulation of natural gas release and dispersion process. The sensitivity to high and low level placement of combustible gas detectors, validity and response time of both combustible and toxic gas detectors in large and small release rates were investigated. The results show that, for high sulfide natural gas leakage, better detection can be achieved when combustible detectors are set higher and hydrogen sulfide detectors are more effective compare to combustible gas detectors. Therefore, the leakage detection system is recommended to be configured mainly with hydrogen sulfide detectors supplemented by combustible gas alarm detectors.
Key words:  computational fluid dynamics(CFD)  gas station  gas detection and alarm instrument  optimization  high sulfide