Analysis of deflagration characteristics of leakage gas on an offshore platform

doi:10.16265/j.cnki.issn1003-3033.2022.10.2741

Abstract

Abstract:

In order to evaluate deflagration consequences arising from natural gas leakage on a domestic offshore platform， ANSYS Fluent software was used to simulate the evolution process of deflagration accidents. Firstly， a three-dimensional model was established based on the structure and equipment layout of the offshore platform. Then， the spatial and temporal distribution characteristics of three key parameters， overpressure of deflagration， high temperature and thermal radiation intensity of combustion， were investigated. Finally， the hazardous area and influence range of the deflagration were analyzed， and the corresponding safety prevention suggestions were proposed. The results show that overpressure has the most serious effect on the three-phase separator and heater skid， while other facilities （i.e.， Christmas trees， laboratory and central control room） are less affected by overpressure. The minimum distance to ensure the safety of humans under overpressure is 22.5 m downwind side of the ignition source. The impact of high temperature on facilities is mainly reflected in the three-phase separator， Christmas trees and column. The hazardous area generated by high temperature is extended to the living quarter. Deformation of facilities on lower deck can be caused by thermal radiation of combustion， and personnel burns can be caused the continuous thermal radiation.

Key words: offshore platform, natural gas, deflagration overpressure, combustion temperature, thermal radiation intensity

MA Chenbo, LU Xinyi, LIU Xiangdong, HU Dong, WU Xu, CAO Yang. Analysis of deflagration characteristics of leakage gas on an offshore platform[J]. China Safety Science Journal, 2022, 32(10): 107-114.

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压力/ kPa	点火源左侧覆盖距离/m	覆盖面积/m²	体积/ m³
15	1.9	2.2	2.2
6	2.1	10.1	19.6
4	5.5	45.7	229.1
2	17.5	366.8	5 977.9