燃烧福建无烟煤CFB锅炉石灰石炉内脱硫试验  

Desulfurization Experiment with Limestone in CFB Boiler Burning Fujian Anthracite

作　　者：洪方明[1] 

机构地区：[1]福建省石狮热电有限责任公司,福建石狮362700

出　　处：《煤气与热力》2011年第7期4-9,共6页Gas & Heat

摘　　要：在一台燃烧福建无烟煤CFB锅炉上进行了炉内添加石灰石脱硫的工业热态试验,分析了Ca/S比(物质的量比)、炉床温度、二次风率、脱硫剂粒径等对锅炉炉内脱硫效果的影响,以及炉内脱硫对锅炉氮氧化物排放浓度、飞灰和炉渣含碳量、飞灰比电阻、电除尘器除尘效率等的影响。试验表明:在Ca/S比较小时,脱硫效率随着Ca/S比的增大而迅速提高;当Ca/S比达到一定值后,脱硫效率提高缓慢,且趋于一稳定值。石灰石的平均颗粒粒径越小,脱硫效率越高;随着炉床温度的上升,脱硫效率线性下降。脱硫效率随着二次风率的增大先缓慢提高后急剧下降,呈开口向下的抛物线分布特征,存在一个最佳二次风率。炉内添加石灰石脱硫对锅炉氮氧化物排放的影响很微弱。飞灰含碳量随着Ca/S比的增大而有所下降,但当Ca/S比达到较高值以后,飞灰含碳量不再明显变化,反而有上升的趋势;炉渣含碳量随着Ca/S比的增大而上升,总体控制在1.5%以下。随着Ca/S比的增大,飞灰比电阻增加,电除尘器除尘效率基本保持不变。An industrial thermal state experiment using limestone for desulfurization is conducted in a CFB boiler burning Fujian anthracite. The influences of Ca/S ratio,bed temperature, secondary air rate, particle size of defulfurizing agent on the desulfurization efficiency in the boiler as well as the influ- ences of desulfurization on the emission concentration of NO=, the carbon content in fly ash and slag, the specific resistance of fly ash and the efficiency of electric precipitator are analyzed. The experiment shows that when the Ca/S ratio is smaller, the desulfurization efficiency is rapidly increased with the rise of Ca/ S ratio, but it is slowly increased and tends to be a steady value when the Ca/S ratio reaches a certain value. The average particle size of limestone is smaller, the desulfurization efficiency is higher. With the rise of bed temperature, the desulfurization efficiency is linearly increased. With the increase of seconda- ry air rate, the desulfurization efficiency is first slowly increased, and then is sharply decreased, as a pa- rabola opening downward, there is an optimal secondary air rate. The desulfurization with limestone in the boiler has little influence on emission of NOx. With the increase of Ca/S ratio, the carbon content in fly ash in reduced, but it does not change and has a rising trend when the Ca/S ratio reaches a higher value. With the increase of Ca/S ratio, the carbon content in slag has a rising trend, and it is generally controlled within 1.5%. With the increase of Ca/S ratio, the specific resistance of fly ash is increased, but the efficiency of electric precipitator remains unchanged.

关 键 词：CFB锅炉 福建无烟煤 Ca/S比 石灰石炉内脱硫 

分 类 号：TU995[建筑科学—供热、供燃气、通风及空调工程]