The influence of heterogeneous flow injection of urea at different velocities and temperatures on NO x conversion efficiency,ammonia storage and ammonia leakage is investigated experimentally.A diesel engine employing...The influence of heterogeneous flow injection of urea at different velocities and temperatures on NO x conversion efficiency,ammonia storage and ammonia leakage is investigated experimentally.A diesel engine employing a selective catalytic reduction(SCR)technology is considered.It is found that for a fixed injection velocity,the degree of ammonia leakage changes depending on the temperature.The higher the temperature,the faster the catalytic reduction reaction and the smaller the degree of ammonia leakage.The temperature has a great influence on the catalytic reduction reaction rate.At an injection velocity of 10000/h,the average reaction rate at 420℃ is 12 times higher than that at 180℃.The injection velocity has a weak influence on the reaction rate.When the injection velocity changes from 10000/h to 40000/h at the same temperature,the average reaction rate does not change appreciably.However,increasing the space velocity can accelerate the leakage of ammonia,thereby miti-gating the benefits associated with the NO_(x) conversion.展开更多
介绍了单火嘴单区烧氨技术在中国石油辽阳石化分公司炼油厂硫磺回收装置的应用情况。重点介绍了烧氨技术的原理,对单火嘴单区和双区这2种烧氨技术进行对比。实践证明:处理含烃高的酸性气的硫磺回收装置宜采用单火嘴单区烧氨技术。该硫...介绍了单火嘴单区烧氨技术在中国石油辽阳石化分公司炼油厂硫磺回收装置的应用情况。重点介绍了烧氨技术的原理,对单火嘴单区和双区这2种烧氨技术进行对比。实践证明:处理含烃高的酸性气的硫磺回收装置宜采用单火嘴单区烧氨技术。该硫磺回收装置硫磺转化率达99.88%,排放尾气ρ(SO2)为307 mg/m3,系统阻力降保持在10 k Pa左右。展开更多
基金supported by the Natural Science Foundation Project of Shandong Provincial(Grant No.ZR2019MEE041)the open funds of National Engineering Laboratory of Mobile Source Emission Control Technology(Grant No.NELMS2019A01).
文摘The influence of heterogeneous flow injection of urea at different velocities and temperatures on NO x conversion efficiency,ammonia storage and ammonia leakage is investigated experimentally.A diesel engine employing a selective catalytic reduction(SCR)technology is considered.It is found that for a fixed injection velocity,the degree of ammonia leakage changes depending on the temperature.The higher the temperature,the faster the catalytic reduction reaction and the smaller the degree of ammonia leakage.The temperature has a great influence on the catalytic reduction reaction rate.At an injection velocity of 10000/h,the average reaction rate at 420℃ is 12 times higher than that at 180℃.The injection velocity has a weak influence on the reaction rate.When the injection velocity changes from 10000/h to 40000/h at the same temperature,the average reaction rate does not change appreciably.However,increasing the space velocity can accelerate the leakage of ammonia,thereby miti-gating the benefits associated with the NO_(x) conversion.
文摘介绍了单火嘴单区烧氨技术在中国石油辽阳石化分公司炼油厂硫磺回收装置的应用情况。重点介绍了烧氨技术的原理,对单火嘴单区和双区这2种烧氨技术进行对比。实践证明:处理含烃高的酸性气的硫磺回收装置宜采用单火嘴单区烧氨技术。该硫磺回收装置硫磺转化率达99.88%,排放尾气ρ(SO2)为307 mg/m3,系统阻力降保持在10 k Pa左右。
