摘要
燃煤过程中CaO与HF反应生成CaF2 在燃烧温度 90 0℃时 ,CaO对煤中氟析出的抑制范围为 12 2 %～61 0 % ,平均为 3 9 5 % CaO固氟最佳条件是 :燃烧温度 80 0～ 10 0 0℃ ,停留时间 5～ 10min ,Ca/S(摩尔比 )为 2 5～ 3 0 钙基固氟剂由钙基吸收剂和添加剂组成 ,主要经历钙基吸收剂的分解反应、CaO固氟反应及硅铝钙等化合物的复合反应而形成高温稳定的固氟产物 工业链条炉燃烧试验表明 :钙基固氟剂在全预混添加方式下固氟率为5 4 0 %～ 64 8% ,平均为 5 9 3 % ;在半预混半喷射两段添加方式下固氟率为 72 5 %～ 80 5 % ,平均为 75 5 % ,明显高于全预混添加方式 CaO和钙基固氟剂的固氟效果与燃烧条件。
The experimental and theoretical analysis about toxic fluoride removal during coal combustion are reported. It has been identified that CaO can restrain the emission of fluoride and fluoride retention ratios are between 12.2% and 61.0%, with mean value 39.5% by blending CaO with coal during coal combustion in tubular furnace at 900°C. Influence factors on fluoride retention by blending CaO with coal are studied such as type of coals, combustion temperature, retention time and Ca/S molar ratio. The optimum conditions for fluoride retention by blending CaO with coal are that combustion temperature in the range 800-1000°C retention time between 5-10 min and Ca/S ratio in the range 2.5-3.0. In chain-grate furnace combustion of coal, fluoride retention ratios are about 54.0%-64.8% with mean value 59.3% by blending calcium-based sorbents with coal and are about 72.5%-80.5% with mean value 75.5% by blending calcium-based sorbents with coal accompanied by injection of calcium-based sorbents.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2003年第2期226-231,共6页
CIESC Journal
基金
国家自然科学基金资助项目 (No 5 98760 36)
浙江省自然科学基金资助项目 (No 5 960 97)
国家重点基础研究发展规划项目 (No G19990 2 2 2 11)~~
