Study On Risk Assessment Method Of Gas Transmission Station Based On SDG-HAZOP

As a new type of clean energy in the 21 st century,natural gas has realizable value and important strategic significance for global sustainable development.Pipeline transportation is the link between the development and utilization of natural gas.As an indispensable part of the long-distance natural gas pipeline system,the gas transmission station is the key to ensuring the stable transportation of natural gas.At present,the risk assessment methods for gas transmission stations have not yet reached a consensus and are still in the exploratory stage.This paper studies the modeling method of SDG-HAZOP method in the gas transmission station.The SDG-HAZOP model of the complex gas transmission system is established to identify the risk propagation path of the gas transmission station and determine the abnormal event caused by the gas transmission station.The evolution of adverse consequences.Using FLACS software,through the establishment of a three-dimensional model of a typical gas transmission station,the evolution process of natural gas leakage accidents over time and the diffusion influence range under different wind speed,wind direction and leakage location factors are studied;the pressure field and temperature field distribution of explosion accidents are studied Laws,and analyzed the consequences of explosion accidents at different ignition positions.Combining the occurrence of accidents caused by fault propagation and the magnitude of the consequences of the accident,a quantitative evaluation method based on the SDG-HAZOP model of the gas transmission station is explored.The specific research work is as follows:1.According to the technological characteristics of the gas transmission station,the modularization of the complex technological system of the gas transmission station yard is proposed to obtain the modeling method of the SDG-HAZOP model of the gas transmission station.Mainly analyzed the process flow of the six major subsystems of cyclone dust collector,filter separator,compressor unit,heat exchanger,pig and gas storage tank,and established the corresponding SDG subsystem model to form a gas transmission station.The SDG-HAZOP method module library makes the modeling process clearer and more systematic.Through the SDG-HAZOP model of the complete station yard,the fault propagation path of the gas transmission station is identified,and three types of fault propagation are summarized.The search algorithm of fault path is proposed.2.When a gas leakage accident occurs in a gas transmission station,in addition to the station working conditions,external environmental conditions will affect the range,concentration and volume of the gas cloud within the explosion limit after the leakage.Considering the influence of different wind speeds,wind directions,and congestion levels on leakage accidents.Through the simulation of leakage and explosion accidents of different equipment,it is found that leakage and explosion accidents in the gas storage tank area and compressor area in a typical gas transmission station are likely to have adverse effects on other areas.3.According to the Bayesian network method of calculating the joint probability,the input of the basic probability is improved,and the calculation method of the SDG-HAZOP failure probability of the gas transmission station is established;the calculation method of the consequences of leakage and explosion accidents is given,and the environmental expansion index is introduced.In the quantitative evaluation of the consequences of a leakage accident,in addition to considering the factors caused by the internal conditions of the system,the influence of environmental factors on the scope of the consequences of the leakage is added,and the SDG-HAZOP quantitative risk evaluation analysis table is established.