粉煤流化床燃烧(PC-FBC)中SO_2的生成特性

SO_2 Production Characteristics in Pulverized Coal Fluidized Bed Combustion

粉煤流化床（ＰＣ－ＦＢ）是一项燃烧效率高，同时实现炉内脱硫、低ＮＯｘ 和Ｎ２Ｏ排放的新型高效、清洁煤燃烧技术．在一座０．３ＭＷ 的试验台上，系统研究了其ＳＯ２生成与分布特性．主要包括：ＰＣ－ＦＢＣ的ＳＯ２生成特性以及床层温度Ｔｂ、流化速度ｕ０、二次风率Ｒ２、二次风投入位置、二次风喷射角度、喷口尺寸对ＳＯ２生成与分布的影响．试验燃用煤种含硫１．７１％ ．在Ｔｂ＝ ８２０～９２０℃，ｕ０＝ １．２～３．３ｍ ／ｓ，Ｒ２＝ ３０％ ～７０％ 的条件下，流化床燃烧区（ＦＢＣＺ）出口ＳＯ２浓度及炉膛出口ＳＯ２浓度ＳＯ″２分别为５２０～６００ｍ ｌ／ｍ ３和１２８０～１３００ｍ ｌ／ｍ ３．

Pulverized Coal fluidized bed(PC FB)is a new clean coal combustion technology,which can get a high combustion effciency and in furnace desulphuration low NO x and N 2O emission In this researching work,production and distribution characteristics of SO 2 in a 0 3MW PC FB experimental rig were conducted systemically The influences of many factors,such as bed temperature( T b),fluidizing velocity( u 0),secondary air ratio( R 2),every layer′s secondary air ratio( R 2i %) etc. were investigated When T b=820～900℃, u 0=1 2～1 3m/s, R 2=30%～70%,SO 2 concentrations were 520～600 ml/m 3 and 1280～1300 ml/m 3 at exit of fluidized bed combustion zone and exit of fluidized combustion zone