Study Of Dynamic Simulation-based Consequences Analysis System Of Chemical Failure

The production safety is a very important issue in the chemical industry. Agingequipments, complex production processes, operational errors and even theenvironment may cause accidents. How to ensure the process running smoothly andsafely in production is a key problem for enterprise and society. Chemical dynamicsimulation systems are used to monitor chemical processes on-line and make a greatcontribution to the production safety. Dynamic simulation-based consequencesanalysis can predict the consequences information of the accident timely. With theinformation, prevention measures of accident are provided for the enterprise and thenthe severity of accidents consequences can be reduced.Data input systems benefits the normal running of CDSS. Fault models ofaccidents reasons that come from Fault Tree Analysis can be designed and thenecessary initial parameters are provided for consequence analysis on the basic ofCDSS. Chemical dynamic simulation system is suitable for unsteady process. Itsinternal models require a large amount of data to run properly and there is a strongcorrelation among these data. Friendly data input system is not only able to makeusers have a good understanding of the significance of the data and the correlationamong these data, but also can effectively prevent users from inputting incorrectinformation. Combining with Fault Tree Analysis, CDSS is able to design a variety offault models. The most common failure of the production process is selected as thetop event by combining the principles of Fault Tree Analysis and common faults ofchemical production. Finally, basic events of the incident that lead to the top event areobtained by step analysis. According to Fault TreeAnalysis and fault models of CDSS, initial parameters are obtained for consequence analysis. Gas leakage is one ofcommon accidents in chemical production. The diffusion process of leaked gas isinfluenced by many parameters, such as wind speed, temperature, humidity andspatial structure of the leakage place. The gas concentration near the leakage point ischanging with time. For deflagrating gas, deflagration accident will occur when theconcentration of the gas reaches the deflagration limit. With CFD numericalalgorithms and MATLAB software, the numerical solution of Partial DifferentialEquations that simulate gas diffusion can be found. The numerical solution can bevisualized by using PDETOOL toolbox of MATLAB, getting the dynamic situation ofgas diffusion and predicting the concentration change of the leaked gas with time.This paper selects acetylene production process as case study and designsdynamic simulation system for the process. The most common failure of the processis diagnosed by using fault tree analysis. And acetylene gas leak failure is selected forthe study, and the original pressure and concentration of the leaked acetylene areobtained on the basis of dynamic simulation system. The paper analyzes theparameters that affect the diffusion of acetylene gas and finally gets the concentrationchange of the leaked gas with time in the acetylene generator plant.