温度压力对瓦斯爆炸危险性影响的实验研究

为了研究瓦斯的爆炸危险性，选取对其影响较大的初始温度和初始压力进行实验研究。运用特殊环境20 L爆炸特性测试系统，对不同初始温度(25~200 ℃)和初始压力(0.1~1.0 MPa)条件下瓦斯的爆炸极限、最大爆炸压力和点火延迟时间进行实验研究。结果表明:高温高压条件使瓦斯的爆炸上限升高、下限降低，爆炸极限范围扩大；随着初始温度升高，瓦斯爆炸的最大爆炸压力逐渐减小；初始温度越高，点火延迟时间越短。通过对实验结果的分析，运用安全原理知识和危险度定义，给出初步评估瓦斯爆炸危险性的方法。

Experimental study on gas explosion hazard under different temperatures and pressures

In order to study the gas explosion hazards under different initial temperatures and high pressures, an experimental study was conducted on methane/air explosion under high temperatures and pressures with a special environmental testing system for studying explosion characteristics, with which the explosion limits were obtained under high temperatures (25-200℃) and high pressures (0.1-1.0 MPa) and so were the maximum explosion pressure and ignition delay time were also under high initial temperatures (25-200 ℃). The experimental results show that with the initial temperature and pressure rising up, the upper gas explosive limit increases, its lower limit decreases, resulting in a widened range of explosive limits. Compared with the narrower range of explosive limits under ordinary temperatures and pressures, the width of the explosive range at 200 ℃ and 1.0 MPa was increased by 101.77% so that the gas explosive probability increases. With the initial temperature rising up, the maximum gas explosive pressure decreases. Compared with the maximum explosive pressure at 25 ℃ and 0.1 MPa, the one at 200 ℃ and 0.1 MPa decreases by 35.89%. When the initial temperature increases, the ignition delay time of gas explosion is shortened. Based on the analysis of the experimental results and the reference of safety principles, a preliminary assessment method of the gas explosion hazard is put forward, which provides a certain basis for the prevention and treatment of gas explosion.