回流式循环流化床烟气脱硫的工程试验研究

Experimental Study of the Flue Gas Desulfurization Project of a Reflux Circulating Fluidized Bed

在银川热电厂5号炉(150t/h)回流式循环流化床烟气脱硫装置开展了半干法循环流化床烟气脱硫技术的工程试验研究,该脱硫装置的设计处理烟气量为160000m3/h。脱硫塔内部及顶部采用了特殊回流结构设计,实现物料塔内内循环,减少除尘装置入口浓度。通过工业试验,研究了钙硫比、喷水量等参数对系统脱硫效率的影响。试验结果表明,当钙硫比为1.3、塔内温度70℃、塔内浓度为800g/m3时,系统脱硫效率可以达到90%,粉尘排放浓度为80mg/m3,脱硫系统阻力小于1.5kPa。

At Yinchuan Thermal Power Plant an experimental investigation was conducted on boiler No.5 (150 t/h) involving the flue gas desulfurization plant for a reflux type circulating fluidized bed (CFB) with a semi-dry method of CFB desulfurization technique being employed. The designed flue gas quantity being treated on the desulfurization plant is 160,000 m3/h. Inside the desulfurizer and at its top employed is a special reflux construction design. With the realization of internal circulation of materials inside the desulfurizer the concentration at the inlet of dust removal device has been reduced. Through industrial tests studied was the impact of calcium/sulfur ratio and water spray rate on the efficiency of the system desulfurization. Test results indicate with the calcium/sulfur ratio being 1.3, temperature and concentration inside the desulfurizer respectively at 70 oC and 800 g/m3 the system desulfurization efficiency can reach 90%, dust emission concentration is 80 mg/m3 and the desulfurization system resistance less than 1.5 kPa.