淮南矿区不同煤组煤灰熔融温度变化规律及机理  

Variation and mechanism of coal ash fusion temperature of different coal groups in Huainan mining area

作　　者：焦发存 姚茜萌 李慧 张湘 刘涛[1] 武成利[1] 李寒旭[1,4] 董众兵 JIAO Facun;YAO Ximeng;LI Hui;ZHANG Xiang;LIU Tao;WU Chengli;LI Hanxu;DONG Zhongbing(School of Chemical Engineering,Anhui University of Science and Technology,232001 Huainan,China;Xingke Metrology Technical Services Company Limitied,Huainan Mining Group,232001 Huainan,China;National Research Institute of Engineering Technology in Coal Mining Group,232001 Huainan,China;Institute of Energy,Hefei Comprehensive National Science Center,230031 Hefei,China)

机构地区：[1]安徽理工大学化学工程学院,安徽淮南232001 [2]淮南矿业集团兴科计量技术服务有限责任公司,安徽淮南232001 [3]煤炭开采国家工程技术研究院,安徽淮南232001 [4]合肥综合性国家科学中心能源研究院,合肥230031

出　　处：《煤炭转化》2023年第3期60-69,共10页Coal Conversion

基　　金：安徽省科技重大专项项目(202003a07020022);安徽高校自然科学研究重点项目(KJ2020A0278)。

摘　　要：淮南矿区煤是优质动力煤,但日常煤质检测发现部分槽别煤样的煤灰软化温度较低,单独使用有导致燃煤锅炉结渣的风险。为了系统掌握淮南矿区不同煤灰熔融温度煤在不同煤组中的分布规律,揭示煤灰熔融温度变化原因,本研究采集淮南不同矿区的A组、B组和C组共40个煤层煤样,对其灰熔融温度进行测定,并利用热力学平衡计算的方法对高温下煤灰矿物组成的转化机理进行研究。结果表明:淮南矿区煤灰化学组成主要以硅铝为主,硅铝总量的平均值达到82.44%,A组煤中硅铝总量低于B组煤和C组煤中硅铝总量;A组煤中铁、钙、镁、钾和钠的总量高于B组煤和C组煤中铁、钙、镁、钾和钠的总量,钙镁主要以方解石或白云石形式存在于原煤中。A组煤中,煤灰软化温度位于1350℃~1449℃的煤样个数占60.0%,低于1350℃的煤样个数占20%;B组煤和C组煤中,煤灰软化温度高于1500℃的煤样个数分别占75.0%和92.3%。煤灰软化温度随酸碱比的增大而升高,当酸碱比大于7.5时,煤灰软化温度高于1500℃。但煤灰软化温度与硅铝比之间没有显著相关性。A组煤煤灰(815℃)中主要矿物为石英、氧化钙、硬石膏、钾云母和赤铁矿;B组煤煤灰和C组煤煤灰中主要矿物为石英、钾云母和赤铁矿。A组煤煤灰在高温下形成熔点相对较低、易溶于初始液相的钙长石、堇青石、镁黄长石以及含Na/K的硅铝酸盐,而B组煤煤灰和C组煤煤灰在高温下形成难熔的莫来石,这是导致A组煤煤灰软化温度低于B组煤煤灰和C组煤煤灰软化温度的主要原因。The coal in Huainan mining area is belong to high-quality thermal coal.However,daily testing has found that the ash softening temperature of some coal samples is relatively low,which may lead to the risk of slagging if such coals are used alone in coal-fired boilers.In order to systematically understand the distribution characteristics of coals with different ash fusion temperatures as a function of coal groups and reveal the mechanisms underpinning ash melting temperature,this study collected a total of 40 coal samples from group A,group B,and group C coal seams in different mining areas of Huainan.The ash fusion temperatures were analyzed,and the transformation mechanism of minerals in ash was evaluated using thermodynamic equilibrium calculation method.The results indicate that the coal ash in Huainan mining area is mainly composed of Si and Al,with an average value of 82.44%.The total amounts of Si and Al in group A coal is lower than that in group B and group C coals.The total amounts of Fe,Ca,Mg,K,and Na in group A coal is higher than that in group B and group C coals,and Ca and Mg primarily exist as calcite or dolomite in the raw coal.In group A coal,60% of the coal samples demonstrate ash softening temperatures ranging between 1350℃ and 1449℃,and the coal samples with ash softening temperature below 1350℃ account for 20%.In groups B and group C coals,75% and 92.3% of the coal samples have ash softening temperatures higher than 1500℃,respectively.The softening temperature of coal ash increases with the increase of the acid-base ratio.When the acid-base ratio is higher than 7.5,the softening temperature of coal ash is higher than 1500℃.Nonetheless,there exists no significant correlation between ash softening temperature and the silica-alumina ratio.The primary minerals in group A coal ash(815℃)are quartz,calcium oxide,anhydrite,potassium mica,and hematite.The minerals in the coal ash from group B and group C coals are quartz,potassium mica,and hematite.When subjected to high temperatures,group A

关 键 词：淮南矿区煤 软化温度 酸碱比 矿物组成 化学组成 

分 类 号：TQ533[化学工程—煤化学工程]