型煤燃烧过程中CaS的形成及其固硫作用  

STUDY ON CALCIUM SULFIDE: FORMING AND THESULFUR CAPTURE EFFICIENCY DURING COALB RIQUETTES COMBUSTION

作　　者：吕欣[1] 林国珍[1] 周广柱[2] 肖佩林[2] 

机构地区：[1]中国科学院生态环境研究中心,北京100085 [2]中国矿业大学北京研究生部

出　　处：《环境化学》1998年第6期528-531,共4页Environmental Chemistry

基　　金：国家自然科学基金资助项目(批准号59676027);硕士研究生

摘　　要：本文研究了不同温度和燃烧条件下Fe-si体系钙基固硫剂的作用效果,实验表明,冷煤粒子直接进入已达一定温度的炉内时,其固硫效果较在程序升温条件下明显提高,在1300℃高温仍有77％的固硫率,含硫物相以CaS为主。该条件下造成了煤粒子的缺氧燃烧,由此造成的局部还原气氛促进了CaS的形成,Fe-Si组分形成的玻璃态无定形相阻碍了CaS的氧化过程,起到稳定含硫物相的作用,从而提高了固硫率,CaS可能是高温条件下的理想固硫产物。When sulfur capture was studied using calcium-based absorper and an additive (Fe, Si), two group of experiments were designed and carried out. Tn the first group, experi-ments were designed as heating the coal continuously from roon temperature to the de-signed one and heating another sample from room trmperature again. In the second they were designed as quickly burning the coal. The residues were analyzed with XRFA and XRPD. It was found that high efficiency of sulfur retention at high temperature(1300°C ) were obtained from the second group of experiments with calcium sulfide formed by large magnitude. The identifying of vitreous iron oxides and small amounts of silicate ex-planined the mechanism of sulfur retentionship.

关 键 词：型煤 固硫 硫化钙 XRFA XRPD 燃烧过程 

分 类 号：TQ534.2[化学工程—煤化学工程] TQ534.9