Research On The Explosion Limit Of Ethane-oxygen And Ethylene-oxygen Mixtures At Elevated Temperatures And Pressures

The explosion limit is an important parameter to carry out explosive gas explosion risk assessment and is also the basic parameter for carrying out explosion prevention and control design.At present,the explosion limit data of common combustible gases at normal temperature and normal pressure is relatively perfect.However,the explosion limit data of combustible gas under high temperature and high pressure conditions are still lacking.Due to the complexity of the test methods under high temperature and high pressure conditions,there are not many studies currently conducted in this area.C₂H₄/O₂ and C₂H₆/O₂ are common media in industrial processes.However,investigations have found that data on these two media at high temperatures and pressures are not yet available.Based on this,this article combines the actual production,using the combination of theoretical analysis and experimental determination,to determine the explosive limits of ethane and ethylene in oxygen under different temperatures and pressures,and comprehensively analyzes the temperature and pressure of ethane and ethylene.Coupling effects of explosion limits in oxygen.?1?According to the relevant specifications,a set of test platform with a capacity of 1.5L can be used to measure parameters of combustible gas explosion characteristics under high temperature and high pressure conditions.The metal and ceramic welding process solves the problem of sealing of electrodes and flanges under high temperature and high pressure conditions.The use of nickel complex gold electric wire as ignition source solves the ignition problem of combustible gas under high temperature and high pressure conditions.Bursting discs are configured to achieve the safety problem of overpressure relief of test devices.?2?The explosion limits of ethane in oxygen at different initial temperatures?25°C to270°C?and initial pressures?0.5 MPa to 2.6 MPa?were measured.Experiments have found that the explosion limit of ethane in oxygen is 3%to 66%at normal temperature and pressure.With the increase of initial temperature and initial pressure,the lower explosion limit of ethane in oxygen gradually decreases,and the upper explosion limit gradually increases.When the initial temperature and initial pressure increase to 270°C and 2.6 MPa,respectively,the explosive limit of ethane in oxygen is 2.25%⁹1.66%.With the increase of initial temperature and pressure,the lower explosion limit of ethane in oxygen decreased by 0.8%,and the upper explosion limit increased by 25.66%.The change of initial temperature and initial pressure has obvious influence on the upper limit of the explosion of ethane in oxygen,and has little effect on the lower explosion limit.?3?The explosion limits of ethylene in oxygen at different initial temperatures?25°C to270°C?and initial pressures?0.5 MPa to 2.6 MPa?were measured.The experimental results show that the explosion limit of ethylene in oxygen at room temperature and pressure is 3%.80%,similar to ethane,with the increase of initial temperature and initial pressure,the lower explosion limit of ethylene in oxygen gradually decreases,and the upper explosion limit gradually increases.When the initial temperature and initial pressure increase to 270°C and2.6 MPa,respectively.At the time,the explosion limit of ethylene in oxygen is 2.15%to95.10%.With the increase of initial temperature and pressure,the lower explosion limit of ethylene in oxygen drops by 0.7%,and the upper explosion limit increases by 15.10%.The change of initial temperature and initial pressure has obvious influence on the upper limit of the explosion of ethylene in oxygen,and has little effect on the lower explosion limit.?4?The initial temperature and initial pressure change have basically the same effect on the lower explosion limit of ethane and ethylene in oxygen.The initial temperature and initial pressure have greater influence on the upper limit of the ethane explosion in oxygen than the upper limit on the explosion of ethylene in oxygen.?5?Under different working conditions,nitrogen and water vapor have inhibitory effects on the upper limit of the ethane explosion in oxygen.The experiment found that with the increase of the initial temperature and initial pressure,the nitrogen inhibition effect will be relatively weak.Water vapor has a better inhibitory effect on ethane explosion than nitrogen.