Leakage risk quantitative calculation model and its application for anaerobic reactor

Anaerobic reactor is one of the most important reaction devices for biogas engineering. Fire, explosion and toxic incidents will be triggered if the biogas leaks, and severe serial explosion accidents will be easily caused if the leakage cannot be identified, monitored and warned early in the process of production and operation. Therefore, this paper aims to establish a leakage risk monitoring and early-warning model for anaerobic reactor. First of all, this paper collects the data from the simulation results of biogas leakage and diffusion, fire, explosion and other accidents, analyses the mechanism correlation that causes accidents of such multi-factor coupling as leakage calibers, elevation of leakage source, weather conditions and environments based on accident information, and finds major reasons that cause the anaerobic reactor accidents and their coupling relationships; second, a multi-parameter coupled model is established in this paper, which can be used to calculate the risk of all kinds of common leakage situations and obtain the information of accident consequences under various scenarios according to parametric variation; finally, this paper develops a quantitative calculation software aiming at the leakage hazards of anaerobic reactor in accordance with this monitoring early-warning model. This software can be employed to evaluate the safety distance and operation area by importing the data of actual production and operation. It can be calculated by the developed software that there shall be at least 9.5 m between anaerobic reactors, and the recommendation on the point location of the gas leakage detector is that the ground leakage source is from0.864 m (LFL) to 2.432 m (1/2 LFL). Besides, the distance of thermal radiation area in the emergency plan is planned.