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在水平封闭的直管中,采用自主研制的阻爆实验系统(包括传感器系统、配气系统、数据采集系统、点火系统等)对不同活性预混气体爆轰火焰在波纹管道阻火器内的传播与淬熄过程进行了实验研究。结果显示当可燃气体接近当量浓度时(丙烷体积分数4.2%、乙烯体积分数6.6%、氢气体积分数28.5%),预混气体从点燃到火焰淬熄过程历时非常短,总体可分为四个阶段,缓慢燃烧阶段、快速燃烧阶段、加速燃烧阶段和超压震荡阶段。丙烷-空气、乙烯-空气预混气体在D=80 mm的管道阻火器中,爆炸压力峰值较高。当管道直径增加至400 mm时,爆炸压力峰值逐渐降低,其中乙烯-空气预混气体的爆炸压力峰值仅为3 MPa左右;氢气-空气预混气体的爆炸压力峰值随管径的增加呈递增趋势。对爆轰速度的研究结果表明,丙烷-空气、乙烯-空气预混气体爆轰速度数值相差不大,丙烷-空气预混气体甚至稍高些;而氢气-空气的爆轰速度数值较高。而且随着管径的增加,管壁热损失增大及其阻力因素等原因影响使预混气体爆轰速度趋向平稳。最后,从经典传热学理论出发,推导出了阻火单元厚度与爆轰火焰速度之间的关系。并结合实验数据,提出了爆轰安全阻火速度的计算方法,为工业装置阻火器的设计和选型提供更为准确的参考依据。
Propagation of different active premixed gas detonation flames in a corrugated pipe flame arrester was carried out in a horizontally closed straight pipe using a self-developed explosion-proof experimental system (including sensor system, gas distribution system, data acquisition system, ignition system, etc.) And quenching process were studied experimentally. The results show that when the combustible gas is close to the equivalent concentration (4.2% of propane volume, 6.6% of ethylene volume fraction and 28.5% of hydrogen volume fraction), the combustion time of the premixed gas from ignition to flame quenching is very short and can be divided into four stages , Slow combustion phase, fast combustion phase, accelerated combustion phase and overpressure oscillation phase. Propane-air, ethylene-air premixed gas In D = 80 mm pipe flame arrester, the peak explosion pressure is higher. When the diameter of pipeline increases to 400 mm, the peak of explosion pressure decreases gradually. The explosion pressure peak of ethylene-air premixed gas is only about 3 MPa. The explosion pressure peak of hydrogen-air premixed gas increases with the increase of pipe diameter . The results of detonation velocity show that the detonation velocities of propane-air and ethylene-air premixed gas are almost the same, the propane-air premixed gas is slightly higher, and the hydrogen-air detonation velocity is higher. And with the increase of pipe diameter, the increase of heat loss of the pipe wall and its resistance factors make the detonation velocity of the premixed gas tend to be steady. Finally, based on the classical theory of heat transfer, the relationship between the thickness of flame-retardant unit and the velocity of detonation flame is deduced. Combined with the experimental data, the calculation method of the detonation safety fire resistance speed is put forward, which provides a more accurate reference for the design and selection of the flame arresters of industrial installations.