LETHAL ENVIRONMENT ASSESSMENT ON SOUR GAS PIPELINE LEAKAGE IN COMPLEX TERRAIN
The leakage probability of sour gas pipeline is very high and the main consequence is lethal environment formed by dispersed hydrogen sulfide (H2S). Mainly based on computational fluid dynamics, an integrated model is proposed to analyze the dynamic leakage of gas pipeline, simulate the H2S dispersion in complex terrain and estimate the public exposure to H2S, which could be used as the basis to determine the scope and severity of the lethal environment during sour gas pipeline leakage. In this paper, the influences of pipeline leakage and atmosphere conditions on the accident consequence are analyzed and the combined conditions of the orifice size, wind speed and atmospheric stability that result in the worst-case scenario are determined. The interactive effects of wind and terrain on the H2 S trajectories are revealed by the simulations under worst-case accident condition. It is showed that the hazard regions always spread in downwind areas, the front of the slopes, and depression areas such as valleys and the gas dispersion models with the assumption of airflow parallel to the ground are hard to provide accurate estimation. Based on dose-response relation, the expected death probability of the lethal region is calculated. And the lethal region is intuitively presented on the map with the statistics of region area, maximal influence distance, spatial distribution trend,.etc. The application in sour gas field in the hill regions of northeast Sichuan in China shows that this model effectively deals with the complexities of the sour gas pipeline leakage. And the information derived form the lethal environment assessment can be used as the basis for risk assessment, emergency response and accident decision making of sour gas pipeline leakage.
Yuan Zhu Guo-ming Chen LIU De-xu
Centre for Offshore Engineering and Safety Technology,China University of Petroleum Dongying,Shandon Petroleum Prospecting and Design Institute,Zhongyuan Petroleum Exploration Bureau Puyang,Henan,China
国际会议
The 3rd World Conference on Safety of Oil and Gas Industry(第三届世界石油天然气工业安全会议 WCOGI 2010)
北京
英文
141-146
2010-09-27（万方平台首次上网日期，不代表论文的发表时间）