不同燃烧条件对燃气火焰NO_x生成量的影响  

Influence of Difference in Combustion Conditions on NO_x Emission in Gas Flames

作　　者：宋在乐[1] 谢广录[1] 范卫东[1] 陆杰[1] 章明川[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《动力工程》2007年第5期771-776,共6页Power Engineering

基　　金：国家自然科学基金资助项目(50306015)

摘　　要：以甲烷火焰和液化石油气火焰为研究对象,通过试验考察了它们在不同预混度和不同环境温度条件下的NOx排放特性。结果表明,对于甲烷火焰和液化石油气火焰,存在一个临界环境温度,在临界环境温度以下,NOx生成量随预混度的变化规律按生成机理可以分为3个阶段:先是快速型NOx起主导作用,然后是快速型NOx和热力型NOx共同起作用,最后是热力型NOx起主导作用;在临界环境温度以上,始终是热力型NOx起主导作用。研究还表明,在一定环境温度范围以内,全扩散或低预混度时,NOx生成量和环境温度基本上是二次函数的关系;全预混或高预混度时,NOx生成量基本上不随环境温度变化。Taking CH4 and LPG （liquefied petroleum gas） flames as the objects of study, NO, emission properties of flames, with different premixing proportions, were experimentally investigated under various environmental temperature conditions. Test results show that there exists a critical environmental temperature for each of the two flames, below which, NOx formation, varying with premixing rate, according its genetic mechanism, may be divided into 3 stages： at first prompt NOx plays the primary role, then prompt NOx appears mixed with thermal NOx, finally thermal NOx prevails ; while above the critical temperature, thermal NOx formation prevails all the way. Research also shows that, within a certain temperature range, with full diffusion or low premixing conditions, the relationship between NOx emission and environmental temperature is basically a quadratic function, whereas under full or high premixing conditions, NO, emission hardly exhibits any change with environmental temperature variation.

关 键 词：环境工程学 甲烷 液化石油气 NOx 临界环境温度 炭黑 

分 类 号：X511[环境科学与工程—环境工程]