摘要
燃烧过程排放的氮氧化物(NOX) 气体是危害很大、很难处理的大气污染物.降低燃烧过程中的NOX排放有两类方法:一是降低NOX的原始形成,第二类是还原已形成的NOX;在还原已形成的NOX 方法中,再燃烧(即部分燃烧后期喷入燃烧) 是当今世界前景看好的低NOX 控制技术,它是利用燃料分级形成还原性气氛迫使NOX分解来降低NOX 形成的燃烧方法.其中,天然气做为再燃烧料已成功用于商业,并在其它措施的基础上再降低NOX50% ~70% .叙述了以天然气做为再燃烧料的再燃烧原理和途径,重点论述了采用无限快反应速率模型,并假定模拟烟气为层流或湍流粘性系数为常数的湍流情况下,运用有限差分及多重网格方法,计算出了这一还原反应过程的浓度场,得到了较为合理的结果.
The gasNOx produced in com bustion is very harm fulto environm ent and difficult to rem ove. There are tw o w ays to decrease it. One isto decrease prim itiveNOx products, anotheristo reduce form ed NOx. In the latterw ay, a m ethod isthatsom efuelisspurted in the laterstageofcom bustion to form a reduction at- m osphere, NOx decom poses in the atm osphere. The technique that naturalgas is used as the fuelcan reduce NOx again by 50% ~70% based on the other m easures. The principle and the realization ofthe technique are introduced. The infinite reaction speed m odelofcom bustion isgiven. The sim ulation calculation ofthe concen- tration distribution of the reduction reaction is m ade by finite difference m ethod and m ultigrid schem e m ethod under lam inalflow flue gas w ith constant viscosity coefficient.
出处
《西安石油学院学报(自然科学版)》
1999年第6期44-46,共3页
Journal of Xi'an Petroleum Institute(Natural Science Edition)
关键词
天然气
数值模拟
还原
再燃烧
氮氧化物
naturalgas, num ericalsim ulation, reduction reaction, recom bustion