An offshore platform ignition and explosion risk analysis method based on ABC-BRANN model

Abstract

The invention discloses an offshore platform ignition and explosion risk analysis method based on ABC-BRANN model. Based on FLACS, numerical models of oil-gas diffusion and ignition-explosion are established to simulate the diffusion in typical scenarios. Combined with the ABC-BRANN coupling algorithm, the diffusion-ABC-BRANN instantaneous predictor is acquired to predict a large number of instantaneous gas cloud volume Q9 value; the numerical calculation of the typical explosion and explosion scene is carried out, and the explosion-based BRANN predictor is developed based on the maximum overpressure of the blasting explosion; the Latin sampling is used to randomly extract the diffusion scene combination from the diffusion probability model as the diffusion-ABC-BRANN instantaneous predictor Input, the instantaneous Q9 and Q6 values are obtained, the optimal sample is determined by the convergence analysis of the inverse cumulative frequency; the obtained Q9 and Q6 values are substituted into the explosion BRANN predictor and the blasting probability model to obtain the blasting load overshoot curve. The method can provide a design accident load value that more accurately reflects the explosion and explosion scene, and the load accuracy is high. The load value can be directly used for the structural anti-explosion design, and provides support for the key structure design of theplatform anti-explosion and disaster reduction.

Description

technical field [0001] The invention belongs to the technology for prevention and control of explosion accidents on offshore platforms, in particular to an ABC-BRANN model-based risk analysis method for explosions on offshore platforms. Background technique [0002] The equipment in the process area of ​​the offshore platform is dense. Once the leaked combustible gas cloud is ignited and an explosion accident occurs, the explosion pressure can be upgraded under the obstacle of congestion, which will eventually lead to serious damage to equipment and serious casualties. Quantitative analysis of deflagration can give the design accident loads (DALs) of the target object from the perspective of statistics or probability, which can not only reduce the risk of detonation accidents, but also greatly reduce the cost of platform design and construction based on the worst scenarios. At present, in the whole stage of offshore platform operation (conceptual design stage, in-service sta...

AI Technical Summary

Problems solved by technology

After that, if the scheme cannot be further improved under the preset number of cycles, limit, it will be abandoned

Images