Leak Consequence And Safety Optimization Of Miniature Skid-mounted Biogas-to-oil Device

Due to the rapid depletion of conventional fossil energy,the new energy industry is developing rapidly.As a renewable clean biomass energy,biogas finds a wide range of industrial applications.However,the technology about converting biogas-to-oil is still in the prototype stage and has not put into large-scale industrial application in our country.Generally,small-scale equipment is used to convert biogas to oil,consuming some toxic and flammable materials such as methane,carbon monoxide,hydrogen,and synthetic oil,which will cause grave consequences if leakage occurs.Therefore,it is of great importance to conduct risk analysis about the toxic material leakage and chemical intoxication.Based on the risk analysis,some measurements can be proposed to counter the high-risk scenarios,which will be helpful to minimize the severity of the consequence caused by the leakage of toxic materials,improving essential safety level of the production process.Currently,the study about leak theory is mainly about the leak in stable state,without taking the dynamic changing of leak intensity over time into consideration.In process control system,it can lead to inaccurate simulation result of the leak accidents with different sizes of leak holes in oil production device with methane as raw material.In this paper,the production process is divided into segments of different pressure,and corresponding leakage flowrate is calculated by LEAK software with leak size ranging from small,medium and large scale.From above analysis,the most risky and severe pressure segment is selected to conduct dynamic simulation to study its leak process in chemical engineering process simulation software HYSYS,so as to obtain the leak intensity profile of classic leak scenario in process control system.Then the leak theory in different production process is studied by CFD software FLACS.The relation between dynamic diffusion density of leaked gas and devices layout which is designed in FLACS by different configuration of protective baffles and safe distance is simulated,to calculate poisonous area based on CO diffusion rule analysis in synthetic compressed gas model and the size of liquid pool in synthetic oil storage model.According to the diffusion rule in classic leak scenario,gas explosion,jet fire and pool fire are simulated in FLACS.The severity of fire and explosion with different leak size in oil production device with methane as raw material is evaluated by the demage criteria for equipment and personnel caused by high temperature and pressure.In the end,based on classic leak scenarios,related safety optimization measurements are proposed,including vapor baffles protective measurements to reduce CO leaking and poisoning risk in methane compressed model,and safety optimization measurements of cofferdam liquid collecting pool with the consideration of pool fire risk in synthetic oil storage model.The simulation verification of the proposed measurements is conducted in FLACS software.