摘要
在煤粉锥形燃烧室的基础上仅更换煤粉喷管为燃气喷管,保持锅炉燃烧系统最小改动的情况下,实验研究了煤粉锅炉改烧天然气时燃烧情况和污染物排放情况.结果表明:燃烧火焰为直径略小于燃烧室出口的蓝色环形,燃烧室内燃烧温度小于 700℃,低负荷下着火火焰锋面前移,燃烧器内温度升高.炉膛中部截面温度最高,后部温度最低,测点温度均小于1 000℃.保持系统空气过量系数 1.1,二次风空气过量系数在 0.7～1.1 内数值越大,氮氧化物产生量越低.空气助燃且全部从二次风通入时,系统满负荷初始NOx 排放为 33 mg/m3;当二次风空气过量系数0.7～1.1,氧含量19.0%,三次风氧含量18.0%,系统满负荷初始NOx 排放均小于 30 mg/m3,其中二次风空气过量系数 1.1,系统满负荷初始 NOx 排放量最低,为15 mg/m3.
Abstract
To realize the aim of pulverized coal boiler to gas boiler transformation retaining the major structure,the replacement is just fixing a gas-fired nozzle instead the coal-fired one.The combustion and pollutant emission characteristics after transformation was studied by experimental research in this article.The results show that:The profile of the flame is a blue annular with a diameter slightly smaller than the outlet of the combustion chamber.The measured temperature in the combustion chamber is less than 700℃,and the flame front moves forward under low load.On the typical sections of the furnace,the combustion temperature is less than 1 000℃.When the total air excess coefficient is 1.1,the Nitrogen oxide production decrease with the increase of the secondary air excess coefficient in the range of 0.7～1.1.The NOx initial emission is 33 mg/m3 at the full combustor load with 1.1 secondary air excess coefficient.When the tertiary air is introduced(the oxygen concentration of secondary air is 19%,the oxygen concentration of tertiary air is 18%),the NOx initial emission is less than 30 mg/m3.Especially,the NOx initial emission at full combustor load is 15 mg/m3 at 1.1 secondary air excess coefficient.
维普
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