水煤浆球在流化床内的燃烧试验及灰色关联分析

为了研究水煤浆在流化床内的燃烧状态，用人工制备的水煤浆球模拟水煤浆滴在炉内下落后形成的浆球，投入不同运行参数(床温、流化数、床料高度)下的以石英砂为床料的热态流化床内进行燃烧试验。其中床温为650、750、850和950℃，流化数W为3、3.5、4和4.5，床料高度为30、50、70和90 mm。分别在15、30、45、60和75s 5个不同的流化时间后取出浆球测量其中残留固定碳占投入浆球内固定碳的质量百分比，分析各参数对燃烧过程的影响，并用灰色关联分析确定各运行参数对该质量百分比的影响排序，可确定床料高度对其影响最小，在前期和后期流化数的影响最大，中期床温影响最大。

Combustion Experiment and Gray Relational Analysis of Coal Water Slurry Balls in Fluidized Bed

In order to study combustion of coal water slurry(CWS) in fluidized bed boiler, man-made CWS ball was used as simulation of the ball formed from CWS drop which falled from furnace top to bed. They were dropped into thermal state fluidized bed furnace whose bed material was quartzite particle under various operation parameters( bed temperature, fluidization number, bed height) to analyze their combustion performance. The bed temperatures were 650℃,750℃,850℃ and 950℃.The fluidization numbers W were 3,3.5,4,and 4.5. The bed heights were 30mm,50mm,70mm and 90mm. The CWS balls were taken out after five various time periods which were 15s, 30s, 45s, 60s and 75s and mass ratio of their residue fixed carbon to original fixed carbon were calculated through which the influence of every parameter was analyzed. The datum were processed using gray relational analysis and the degree of their influence to the ratio were sorted. The conclusion is that the influence of bed height is the least, fluidization number has greatest influence in primary stage and final stage, and bed temperature contributes most in intermediate stage.