循环流化床煤气化试验研究

在常压循环流化床中试装置上进行了神华煤的气化试验，试验条件：加煤速率5．4～8．14kg／h、蒸汽煤比0．19～0．7kg／kg、空气煤比2．8—3．67kg/kg，分析了试验条件对煤气组成、热值、碳转化率和煤气效率的影响。在该试验阶段获得的煤气的最高热值为3．84MJ/Nm^3，最高碳转化率为73．6％。由于提升管的高度很小、气化温度较低以及旋风炉对细颗粒分离效率不高，导致损失于飞灰中碳较多。试验结果表明对神华煤而言，气化温度应低于930℃以避免结渣。

EXPERIMENTAL STUDY ON COAL GASIFICATION IN A CIRCULATING FLUIDIZED BED

Experiment results on gasification of a bituminous coal in a pilot scale circulating fluidized bed at atmospheric pressure and different operation conditions, rates of coal feed from 5.4 to 8.14kg/h, ratios of steam/coal from 0.19 to 0.7kg/kg and ratios of air/coal from 2.8 to 3.67kg/kg,are reported. The effect of operation conditions on gas compositions, calorific values, carbon conversions and gasification efficiencies are analyzed. At present stage, the maximum calorific value of product gas was 3.84MJ/Nm3 and the highest coal conversion efficiency was 73.7%. Much carbon was lost in fly ash after the cyclone due to the short of the lift, the low gasification temperatures and the low separation efficiency of the cyclone for fine particles.Gasification temperature must be limited to 930℃ for Shenhua coal to avoid slagging.