半干法脱硫产物中亚硫酸钙转化的研究.pdf

华北电力大学(保定)
硕士学位论文
半干法脱硫产物中亚硫酸钙转化研究
姓名:许琴
申请学位级别:硕士
专业:环境科学与工程;环境工程
指导教师:赵毅
2011-06
摘要
摘要

半干法脱硫灰的主要组成物质为粉煤灰、亚硫酸钙、氢氧化钙、碳酸钙、
硫酸钙和氯化钙等。由于其中含有较多的亚硫酸钙而不利于脱硫灰的综合利用。
本文首先分析了半干法脱硫灰的理化特性,通过实验研究了半干法脱硫灰的稳
定性,得出半干法脱硫灰不宜于在高温缺氧环境中综合利用,在露天堆放或者
综合利用过程中,应尽量避免与酸性溶液或酸性降雨接触。通过实验,对氯化
铁,硫酸钴,氯化亚铜,氯化镁,硫酸铁和硫酸锰对亚硫酸钙催化氧化的效
果进行了比较。发现硫酸锰对亚硫酸钙的催化氧化具有较好的效果。从催化剂
添加量、反应温度、反应时间等影响因素对硫酸锰催化氧化亚硫酸钙的影响进
行了实验研究。结果表明,低温时,催化剂的加入对于亚硫酸钙的氧化有着明
显的促进作用,且氧化速率随着催化剂添加量的增加而增大;随着温度的升高,
亚硫酸钙的转化速率不断增大;在温度较低时,以催化剂作为主要影响因素,
而在温度较高时,温度的影响更为明显;随着反应时间的延长,亚硫酸钙的浓
度不断降低,转化速率开始时增大,而后趋于稳定。


关键词:半干法烟气脱硫;脱硫灰;亚硫酸钙;转化
I
ABSTRACT
Abstract
ponents of Semi-dry FGD byproducts are mainly fly ash, calcium
sulfite, calcium hydroxide, calcium carbonate, calcium sulfate and calcium chloride.
It is difficult to be used because of a large mount of calcium sulfite in Semi-dry FGD
byproducts. The catalytic oxidation effects of calcium sulfite by ferric chloride,
cobalt sulfate, chloride, magnesium chloride, ferric sulfate and manganese sulfate
pared through experiments in this paper. It is found that manganese sulfate is
the best catalyst for calcium sulfite oxidation. The experiments about the effect of the
catalyst dosage, reaction temperature, reaction time on the manganese sulfate
catalytic oxidation of calcium sulfite by manganese sulfate were carried out. The
results show that at low temperature, the catalyst has a clear influence in promoting
oxidation of calcium sulfite, and the oxidation rate increased with the amount of
catalyst increasing. The conversion rate of calcium sulfite increases continuously
with the temperature increasing. At lower temperatures, catalyst is the main factors
for catalytic oxidation of calcium sulfite, and at higher temperatures, the temperature
is more obvious at higher temperatures. With the lengthening of reaction time, The
concentration of calcium sulfite decreases with reaction time, and the conversion
rate first increases, the