富钒石煤与生物质在CFBC试验台上的混烧实验

Mixed Combustion Experiment of Vanadium-enriched Stone Coal and Biomass on a CFBC(Circulating Fluidized Bed Combustion) Test Rig

针对石煤富钒的特点,利用实验室规模的循环流化床燃烧装置(CFBC),进行了生物质与富钒石煤的混烧实验研究,以期通过富集钒和回收热量达到资源综合利用的目的。实验结果表明:所实验的富钒石煤容易着火,燃烧稳定,燃尽性好,包括与生物质混烧也是如此;经过燃烧后,石煤中的钒大部分转换为五氧化二钒,并在灰渣中富集;石煤颗粒尺度大小、燃烧温度对钒的迁移特性没有显著影响;通过向炉内加入石灰石进行炉内脱硫,当Ca/S摩尔比为3时,烟气中的二氧化硫排放浓度低于国标。

In the light of the specific features of vanadium-enriched stone coal and by utilizing a laboratory-scale CFB(circulating fluidized bed) combustion plant,a mixed combustion experiment was carried out for the stone coal in question and biomass.It was aimed at the comprehensive utilization of resources through vanadium enrichment and heat recovery.The test results show that the stone coal under test is easy to ignite,maintains a steady combustion and displays good burn-out characteristics.This is also the case even when the stone coal is fired with biomass in a mixed combustion.After combustion,the majority of vanadium in the stone coal was transformed to V2O5 and became enriched in ash and slag.The stone coal particle diameter and combustion temperature exercise no remarkable influence on the migration characteristics of vanadium.By adding limestone to the furnace,a desulfurization can be effected.When Ca/S mole fraction equals 3,the concentration of SO2 emissions in the flue gas will be lower than the national standard.