气化气燃烧过程中二噁英和NOx的协同控制

Synergistic control of dioxins and NO x during combustion of gasification gas

针对生活垃圾气化气燃烧过程中二噁英和NO x的协同控制问题展开了实验研究。采用空气分级燃烧气化气的方式,对第一级空气过量系数(SR1)、第二级停留时间和反应温度等影响因素进行了探究。结果表明:(1)SR1=0.7时NO x生成量最小,反应温度的提高将导致NO x生成量增加,900℃的反应温度处在NO x还原的最佳温度区内;(2)SR1、第二级停留时间和反应温度的升高均有利于抑制二噁英的生成;(3)在900℃、SR1=0.7和第二级停留时间为1.00 s时,二噁英和NO x的协同控制可满足《生活垃圾焚烧污染控制标准》(GB 18485—2014)的要求。

An experimental study on the synergistic control of dioxins and NO x during combustion of gasification gas was carried out using updraft gasification gas combustion.The influencing factors such as first-stage air excess ratio(SR1),second-stage residence time and reaction temperature were studied.Results showed that:(1)when SR1=0.7,the production of NO x was the smallest,the increase of reaction temperature would lead to the increase of NO x production,and 900℃was in the best reaction temperature range for NO x reduction.(2)The increase of SR1,second-stage residence time and reaction temperature were beneficial to the inhibition of dioxins.(3)The synergistic control of dioxins and NO x could meet the emission requirements of“Standard for pollution control on the municipal solid waste incineration”(GB 18485-2014)when reaction temperature was 900℃,SR1=0.7 and second-stage residence time was 1.00 s.