The Research On Inherent Safety Assessment Of The Chemical Technique & Equipment

Chemical enterprises tend to have some catastrophic accidents because of their hazards brought by chemical materials and process' characteristics. Safety design of chemical process and equipment is one of the important methods to reduce chemical accidents. Inherent safety has been recognized as an effective design approach. However, inherent safety evaluation cannot be quantified perfectly because of difficulties for the systematic application and quantification of inherent safety in equipment design phase. "Safety" is a vague concept because there is no clear boundary between "safe" and "unsafe". Inherent safety is just an ideal condition, so the problem is just "matter of degree".An inherent safety assessment model had been developed in this dissentation by taking the hazards of material, technical and the safety devices that are required by chemical process into account. And the Mamdani fuzzy inference algorithm had been used to assess the degree of inherent safety. The problem of data's uncertainty and subjectivity had been solved by using of IF-THEN rules and applying fuzzy membership functions.A case about the process of hydrodealkylation of toluene for the production of benzene had been studied at the end of this report. The feasibility and validity of inherent safety assessment had been proved by this case. And the result of this research indicates that the probability and severity of chemical hazards can be reduced by applying inherent safety principles into design.