高温高压条件下可燃气体安全氧含量测定试验研究

Experimental study on determination of safe oxygen content in combustible gas under high temperature and high pressure

针对注空气过程中可燃气体有发生燃爆的风险,对常温常压下的安全氧含量进行了理论计算;采用试验装置对压力1~30 MPa、温度40~120℃环境下可燃气体的安全氧含量进行了测定,并基于试验数据进行了数据拟合。研究结果表明,安全氧含量与初始压力呈对数关系,与初始温度呈线性关系,温度、压力的升高均会造成安全氧含量的降低,其中30 MPa、120℃条件下不发生燃爆的安全氧含量为6.68%(体积分数),远小于常温常压下的理论计算值10.08%(公式法)和12.17%(爆炸三角形法),体系危险性大幅增加。研究结果可为注空气驱现场安全生产和工艺操作提供理论依据和指导。

In view of the risk of ignition and explosion of combustible gas in the process of air injection,the safe oxygen content of combustible gas under normal temperature and pressure was calculated theoretically.The safe oxygen content of combustible gas under pressure of 1-30 MPa and temperature of 40-120 ℃ was measured by the test device.The data fitting was carried out based on the test data.The results show that the relationship between the safe oxygen content and the initial pressure was logarithmic,and the relationship between the safe oxygen content and the initial temperature was linear.With the increase of temperature and pressure,the safe oxygen content decreased.The safe oxygen content under the conditions of 30 MPa and 120 ℃ is 6.68%,far less than the theoretical values of10.08%(by formula method) and 12.17%(by explosion triangle method) under normal temperature and pressure,and the system risk increased.The results can provide theoretical basis for the safety production and process operation of air flooding.