Optimal Gas Detectors Placement Of Oil Refining Unit Based On Risk And Benefit

The production process of oil refining unit usually accompanies by dangerous gas.If there is no reliable security as a hazardous gas detection system,once the leakage occurs,the consequence would be extremely serious.The optimal arrangement of detectors plays an important role in ensuring the safety of refinery staff and reducing the loss of accidents.This study depends on Shandong Province Natural Science Fund Project(ZR2012EEQ026)" High Sulfur Crude Oil Processing Device of Hydrogen Sulfide Leakage Detection Optimization" and basic scientific research business central university funds special funds to finance the project(13CX02079A)Study on Optimization Method of Gas Detection Alarming Devices Layout for Chemical Equipment”,and studies optimization layout for gas detectors based on risk and benefits,,providing theoretical and technical support for the improvement of production safety and risk management in refining device.The specific research contents are as follows:Construction of complete accident scene based on Monte Carlo method: According to the results of risk identification,identifying the risk variables involved in the leak accident and analysis of its uncertainty.Determine 4 risk variables to the risk system and their probability density function distributions.The probability density function distributions were randomly sampled by Monte Carlo method and construct the complete accident scenario of hydrogen sulfide leakage in refinery unit by combination of sampling parameters.Using LEAK to build the risk model of hydrogen sulfide leakage and calculate the leakage probability of hydrogen sulfide leakage equipment.Risk assessment of hydrogen sulfide poisoning in refinery unit based on CFD simulation: Build a 3D model of hydrogen sulfide leakage in diesel oil refining unit,and set monitoring points to predict hydrogen sulfide concentration distribution according to the standard.By simulating the hydrogen sulfide leakage scenario,we can get the concentration distribution of hydrogen sulfide in the calculation domain.Depend on the standard for the toxic dose response of a given chemical and the probability of death from poisoning,we can convert the concentration of CFD simulation into human health effects.Calculate the cumulative risk of poisoning in the area.Divide risk level of hydrogen sulfide poisoning area into characterize risk of receptors exposure to a particular risk venue.Optimal arrangement of gas detectors in refinery plant based on risk and return: Use Monte Carlo method and CFD simulation to get the individual risk area of oil refining device poisoning.For the unacceptable area and gray area,construct optimization mathematical model based on cost and benefit.The objective function is to minimize the individual risk,and the best cost-benefit ratio as the constraint condition.Construct 0-1 integer programming model by YALMIP to solute the optimal detector arrangement.Finally achieve the overall control of the risk of leakage as well as save equipment investment.