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为考察惰性气体(N2)对瓦斯爆炸过程的影响,建立了受限空间(定容弹)中瓦斯爆炸反应的计算模型,化学反应采用详细反应机理(包括53种组分、325个反应).结果显示,影响瓦斯爆炸及爆炸后部分致灾性气体生成的关键反应步有R32,R53,R98,R155,R156,R158,R161,R170,瓦斯爆炸会产生瞬间高温和高压,爆炸持续时间仅为0.0001s左右;惰性气体(N2)对瓦斯爆炸有抑制作用,混合气中N2浓度越大,瓦斯引爆时间越延迟,且随N2浓度增长,爆炸强度也越弱(充入10%,15%,20%N2,爆炸时间分别延迟0.0009,0.0013,0.0019s,爆炸后压力以约5.065kPa递减,爆炸温度以约35K递减);在混合气体中充注N2能在一定程度上抑制CO,CO2,NO,NO2等有害气体的生成,含N2量增加抑制作用更明显.
In order to investigate the influence of inert gas (N2) on the gas explosion process, a computational model of gas explosion reaction in a confined space (constant volume bomb) was established. The detailed reaction mechanism (including 53 components and 325 reactions) was adopted for the chemical reaction. The results show that there are R32, R53, R98, R155, R156, R158, R161 and R170 in the key reaction steps that affect the gas explosion and some of the disastrous gases after explosion. The gas explosion will produce instantaneous high temperature and high pressure. The explosion duration is only 0.0001s; inert gas (N2) has an inhibitory effect on gas explosion. The greater the concentration of N2 in the mixture gas, the more the detonation time of gas is delayed. With the increase of N2 concentration, the intensity of explosion is weaker (10%, 15% 20% N2, the explosion time were delayed by 0.0009,0.0013,0.0019s, respectively, the post-explosion pressure decreased by about 5.065kPa, and the explosion temperature was decreased by about 35K). When N2 was added to the mixed gas, CO, CO2, NO , NO2 and other harmful gases, including the increase of N2 inhibition is more obvious.