煤中氯在亚临界水条件下的变迁  

Transformation behavior of chlorine in coals during sub-critical water treatment

作　　者：王宝凤[1] 李文[1] 李保庆[1] 尉迟唯[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室

出　　处：《燃料化学学报》2007年第5期518-522,共5页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(90210001);国家自然科学重点基金(90410017)

摘　　要：运用半连续反应装置对山西吴家坪煤和四川华蓥山煤中氯在亚临界水条件下的脱除规律及形态变化进行了研究。考察了反应温度和压力对氯脱除率的影响;同时还运用化学提取法对原煤及残渣中氯的形态进行了研究。研究结果表明,随着反应温度的升高,煤中氯的脱除率也增加,在410℃、15MPa、60 min、水流量为580 mL/h时,吴家坪煤中氯的脱除率为84.6%,华蓥山煤中氯的脱除率为72.4%。吴家坪煤中氯在15 MPa时的脱除率最大。华蓥山煤中氯主要以有机氯的形态存在,而吴家坪煤中氯有8%为离子可交换态的无机氯,其余为有机结合的氯;在亚临界水萃取煤的过程中,离子交换态结合的有机氯比共价键结合的有机氯更容易挥发,有机氯要首先转化为无机氯然后再逸出。Removal and transformation behavior of chlorine in two Chinese bituminous coals(WJP and HYS coal) during sub-critical water treatment were studied in a semi-continuous apparatus.The influence of temperature and pressure on the removal of chlorine was examined;and chemical extraction was also done to determine the occurrence mode of chlorine in raw coal and its residues.The results show that the removal of chlorine in two coals all increases with increasing temperature;at 410 ℃,15 MPa,60 min and water flow rate of 580 mL/h,the removal of chlorine is 84.6% and 72.4% for WJP and HYS coal,respectively.The maximum removal of chlorine from WJP coal,79.8%,is obtained under 15 MPa.Chlorine in HYS coal is mainly organically associated,among which 23.6% is bonded to organic cations by ion exchangeable mechanism and 76.4% is covalently-bond organic chlorine;while for WJP coal,that is 39% and 52.9%,respectively,and the other 8% is associated with inorganic matters.During sub-critical water treatment,chlorine bound to organic cations by ion exchangeable mechanism is more easily volatilized than covalently-bond organic chlorine;and the chlorine associated with organic matters will be firstly turned into inorganic form,and then released from the coal.

关 键 词：煤 脱氯 赋存形态 亚临界水萃取 

分 类 号：TQ53[化学工程—煤化学工程]