【作者】 周屈兰； 刘尧祥； 惠世恩；

【Author】 Zhou Qu-lan; Liu Yao-xiang; Hui Shi-en (Xi’an Jiaotong University School of Energy and Power, Xi’an, 710049, China)

【机构】 西安交通大学能源与动力工程学院；

【摘要】 在一维热态煤粉炉上进行了粉煤灰干法、尾部增湿以及灰浆湿法烟气脱硫试验。其结果表明,利用高钙粉煤灰组织炉内或尾部烟气的脱硫都能取得一定的效果。研究发现干法脱硫效果是粉煤灰对SO2的物理吸附和化学反应吸收这两个过程共同作用的结果,在增湿和湿法脱硫中,自由水分的存在是提高脱硫率的关键因素,而湿法中Ca/S对脱硫的影响占据主导地位。试验所得到的干法脱硫效果最差,增湿脱硫效果明显提升,灰浆脱硫效果最优,后者的Ca/S=0.864～1.86,得到了53%～78%的脱硫率,达到了中等脱硫效果,具有应用于工程实际的前景。更多还原

【Abstract】 The experiments were finished in one-dimension coal-fired furnace, which included dry type with fly ash injecting into the furnace, the further atomized water addition-activation in back-end ductwork, and wet FGD with fly ash slurry. It can be seen from the result that the fly ash containing high free CaO has some ability of removing sulfur in furnace or back-end ductwork. Experimental study shows that the physical adsorption and the chemical absorption of SO2 by fly ash both acts on the effect of the dry type, unbound water is a key factor of the increase of the efficiency of the moisture-additive and wet process relative to the dry, and the molar ration of calcium to sulfur, Ca/S, plays a dominant role on the desulphurization in the wet type. The efficiency of dry FGD was the lowest, that of the moisture–additive process mounted obviously, and the efficiency of the wet type with fly ash slurry spraying is the highest. When Ca/S was equal to 0.864~1.86 in the wet type, the efficiency of sulfur removal was between 53% and 78%, which reached a medium purpose of desulphurization. Consequently wet FGD with fly ash slurry spraying will have a perspective to adopt in engineering practice by all appearances.更多还原