喷射火模型在输气管道火灾爆炸事故分析中的应用

本文对喷射火模型在输气管道火灾爆炸事故产生的过程、结果进行了分析研究。

基于FDS大涡模拟的工业建筑喷射火模拟分析

为探究工业建筑中储罐喷射火的影响,根据工业火灾燃烧特性,采用数值模拟的方法对开放环境的喷射火灾进行模拟。首先利用FDS大涡模拟验证喷射火经验模型。然后利用FDS大涡模拟不同风速下某企业储罐喷射火焰的发展过程以及对相邻建筑的影响。对比不同火灾场景下的模拟结果,分析喷射火焰的变化和对相邻建筑造成的热辐射、温度的变化。结果表明,FDS大涡模拟与喷射火经验模型吻合,热辐射强度相对误差随着离泄露口距离增大而减小。随着风速的增大,喷射火受到的扰动增强,喷射火对沿喷射方向建筑的影响逐渐减弱,企业要加强对极端天气的防范和建筑间的合理布局。

炭黑厂尾气管道泄漏火灾事故后果模拟

采用喷射火模型,对某炭黑厂尾气管道泄漏火灾事故后果进行定量模拟分析,依据热辐射的不同入射通量对人的伤害程度确定死亡、重伤、轻伤半径分别为3.1m、3.7m、5.3m,从而为尾气管道泄漏火灾事故的防治提供科学依据。

某脱硫厂天然气管道泄漏火灾事故后果模拟

为防止天然气管道泄漏造成灾难性后果,采用喷射火模型对天然气管道泄漏的火灾事故进行定量模拟分析,计算出天然气管道泄漏后的死亡半径、重伤半径等,其结果可以为重庆某脱硫厂应急救援提供技术支持。

Investigation on Combustion Characteristics and NO Formation of Methane with Swirling and Non-Swirling High Temperature Air

Combustion characteristics of methane jet flames in an industrial burner working in high temperature combustion regime were investigated experimentally and numerically to clarify the effects of swirling high temperature air on combustion.Speziale-Sarkar-Gatski(SSG) Reynolds stress model,Eddy-Dissipation Model(EDM),Discrete Ordinates Method(DTM) combined with Weighted-Sum-of-Grey Gases Model(WSGG) were employed for the numerical simulation.Both Thermal-NO and Prompt-NO mechanism were considered to evaluate the NO formation.Temperature distribution,NO emissions by experiment and computation in swirling and non-swirling patterns show combustion characteristics of methane jet flames are totally different.Non-swirling high temperature air made high NO formation while significant NO prohibition were achieved by swirling high temperature air.Furthermore,velocity fields,dimensionless major species mole fraction distributions and Thermal-NO molar reaction rate profiles by computation interpret an inner exhaust gas recirculation formed in the combustion zone in swirling case.