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选择刚玉作为床料,利用循环流化床对天池木垒煤进行了气化实验研究,研究了刚玉对失流的抑制作用、矿物元素在不同粒径颗粒中分布以及煤中Na经过气化反应后的迁移转化规律。研究结果表明,以刚玉作为床料会降低底渣表面包覆层黏性,避免颗粒聚团导致失流;在刚玉诱导下,煤中Al、Si、Ca、Fe、Na和Mg等绝大多数矿物质元素在底渣和循环灰中富集,并导致物料粒径不断增大;935℃床温下(以刚玉为床料),天池木垒煤中Na在底渣、飞灰和煤气中的分布率分别为39.6%、45.4%和15%,相对于以石英砂为床料的情形,刚玉有效抑制了Na的挥发,降低了尾部沾污发生的机率;在刚玉作用下,固留在底渣中的Na主要以NaAl_(11)17、NaAlSi_2O_6和NaAlSi_3O_8等形式存在,并且刚玉与煤中矿物质元素反应生成的物质具有较高的熔点,避免低温共熔现象发生。
Select corundum as the bed material, the use of circulating fluidized bed on the Tianchi Mu Li coal gasification experimental study of the inhibitory effect of corundum on the loss of flow, the distribution of mineral elements in different particle size distribution of coal and Na through the gasification reaction After the transfer of transformation rules. The results show that the use of corundum as a bed material will reduce the viscosity of the bottom slag surface coating to prevent particle agglomeration leading to loss of flow; in the corundum induced coal, Al, Si, Ca, Fe, Na and Mg most of the vast majority Mineral elements in the bottom ash and ash cycle enrichment, and lead to increasing material particle size; 935 ℃ bed temperature (with corundum as bed material), Tianchi Mu base coal in the bottom slag, fly ash and gas , Respectively, compared with 39.6%, 45.4% and 15% respectively. Corundum effectively inhibited the volatilization of Na and reduced the probability of tail contamination when compared to quartz sand as the bed material. In corundum, The Na in the bottom slag exists mainly in the forms of NaAl 11, NaAlSi 2 O 6 and NaAlSi 3 O 8, and the material formed by the reaction of corundum with the mineral elements in the coal has a higher melting point and avoids the occurrence of low temperature eutectic.