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《Coal Science and Technology》 2017-09
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Effect of additives on sodium release proportion in coal from Shaerhu Coal Mine

SHI Huijuan;ZHOU Qi;CHEN Shanlin;ZHANG Dinghai;MAO Yu;WANG Yuqin;RAN Shenming;Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province;Dongfang Electric Group Dongfang Boiler Co.,Ltd.;  
In order to solve the bad fouling on heating surfaces caused by using coal from Shaerhu Coal Mine as the fuel of utility boilers,the sodium content was measured by the combination method of one-step-extraction and 600 ℃ low-temperature ashing,the sodium release proportion in coals were tested at different temperatures and national standards ashing with different additives,such as kaolin,Al_2O_3,SiO_2,CaCO_3,SiO_2/Al_2O_3( mass ration of 5 ∶ 1) and percentages. The results showed that the content of Na_2O was 0.907%,the sodium release proportion increased when the ashing temperature ascended,and the sodium release proportion would be enhanced when taking CaCO_3 as the additive,while kaolin played an obviously negative role,the sodium release proportion reduced not much when the additive consisted of Al_2O_3 or SiO_2/Al_2O_3,and Al_2O_3 was the primary effective factor,while SiO_2 affected the sodium release proportion little.
【Fund】: “十二五”国家科技支撑计划资助项目(2015BAA04B02)
【CateGory Index】: TQ533
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