摘要
为实现电除尘器在发生炉煤气净化中的应用,解决发生炉煤气的防爆与泄爆问题,文中采用RNG k-ε湍流及燃烧模型,对发生炉煤气在电除尘器中的爆炸及泄爆过程进行了数值模拟研究,分析了初始温度、初始压强、局部高氧气团对爆炸压力的影响,并对泄爆阀孔径对泄放效果的影响进行了研究。结果表明,最大爆炸压力随初始压力增大而线性增大,但随初始温度的升高而急剧下降;局部高氧气团爆炸使泄爆阀开启的临界直径为1.2 m,此时气团与电除尘器体积比为0.04;泄爆阀开启泄出的气体速度和温度较高,易引发二次爆炸;在1.4 m直径局部气团爆炸基础上,400 mm泄爆阀泄压时间为0.17 s,直径600 mm和800 mm泄爆阀的泄爆时间分别较之提高了72.3%和82.3%。
To apply electrostatic precipitator ESP in the purification of producer gas gas explosion and venting processes are nu？merical simulated by using the RNG k？ε turbulence model and combustion model.The effects of initial temperature pressure local air mass with high oxygen content on explosion are discussed.The effect of venting valve aperture on venting process is also ana lyzed.The results show that the maximum explosion pressure is linear function of operating pressure but significantly decreased with operating temperature.The critical air mass diameter is 1.2 m which will open the venting valve.The volumetric ratio of critical air mass with the model is only 0.04.The high temperature gas emitted from valve may lead to secondary explosion.When the air mass with d= 1.4 m exploded it took 0.17 s to complete venting process for valve of D= 400 mm.The venting time of D= 600 and 800 mm increased by 72.3% and 82.3% respectively compared with above.The simulated results agree well with the theoretical results and the dates of literatures so it can provide theoretical guidance for engineering design.
出处
《燕山大学学报》
CAS
北大核心
2015年第2期182-188,共7页
Journal of Yanshan University
基金
河北省自然科学基金资助项目(E2015203236)
河北省重大技术创新项目(10273920z)
关键词
电除尘器
发生炉煤气
爆炸
泄爆
数值模拟
electrostatic precipitator
producer gas
explosion
venting numerical simulation
