电磁场对循环流化床燃煤特性影响的分析  

Study on the influence of electromagnetic field on the property of coal combustion burnout in circulating fluidized bed

作　　者：向阳 

机构地区：[1]瑞平煤电有限公司,河南汝州467535

出　　处：《煤炭学报》2008年第8期936-940,共5页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(50576025)

摘　　要：进行了3个煤样的热重实验、马弗炉实验以及XRD测试.实验结果表明：磁化将导致煤分子结构更趋向于无定型碳结构,使煤样在燃烧反应的初期吸氧速率增大,反应活性提高;在循环流化床的运行温度范围内,对同一煤种,在1 min内增加磁化时间会使烟煤燃烧时灰中（干燥无灰基）的残碳含量增加0.33%-0.41%,对2台480 t/h的锅炉,每年损失标煤约3 000 t;而当温度增加200℃时,烟煤的残碳含量下降2.07%,但磁化的影响量小于0.21%;贫煤的残碳含量下降1.47%,但磁化的影响量小于0.05%;因此,温升效应对磁化煤燃尽的影响小于磁化时间效应.For study on the influences of electromagnetism field pretreatment of pulverized coal （EFPPC） on the properties of its combustion, thermogravity analysis, Muffle furnace experiment and X-ray diffraction experiment for three coal banks were carried out. it is shown that EFPPC will induce the molecules structures of coal changed into amorphous carbon, which will cause an increase of the absorbing oxygen rate during the initial stages of coal burning and reaction activity; it is also shown that the residual carbon of bituminous coal would be increased about O. 33% -0.41% , i. e, the loss of standard coal is about 3 000 t/a for double 480 t/h boilers, when increasing the time of EFPPC in 1 min at temperature 800 - 1 000 ℃ for the same kind of coal; at the same time, when the temperature increases 200 ℃ , the residual carbon increases about 2.07% , but the fraction of effect of EFPPC is less than 0. 21% for bituminous coal, and it is about 1.47% , but the fraction of effect of EFPPC is less than 0. 05% for lean coal, therefore effect of increase temperature on residual carbon of EFPPC is less than that of increase the time of EFPPC.

关 键 词：循环流化床 煤燃烧 磁化 反应活性 燃尽度 

分 类 号：TQ534[化学工程—煤化学工程]