为研究高钠煤掺烧煤矸石抑制煤灰沾污结渣可行性，采用热重分析仪和固定床反应器考察了二者掺烧性能及掺烧对煤灰中Na保留的影响。通过掺烧前后灰渣中Na含量的差异，评价高钠煤掺烧煤矸石提高Na在灰渣中保留的可行性。通过对比理论和试验燃烧失重和质量变化速率，确定二者掺烧中协同转化性能。试验用高钠煤中的Na主要以水溶性、酸溶性和胺溶性钠为主，但燃烧前后均未检测到含钠化合物的晶体衍射峰。掺烧可显著提高灰渣中钠含量，当高钠煤燃烧中添加10%煤矸石时，灰渣中Na含量提高50%～75%，证实了掺烧煤矸石可实现燃烧中固钠。同时，掺烧提高了燃烧反应速率，降低了最大燃烧失重峰温，表现出明显的协同转化作用。通过进一步优化掺烧工况，有望实现高钠煤与煤矸石协同、高效、安全转化，达到节能减排目的。

For investigation of the feasibility of cofiring high sodium coals (HSC) mixed with coal gangues (CG) to inhibit fouling and slagging of coal ash，thermogravimetric analyzer and fixed bed reactor were used to evaluate the cofiring performance and effect on Na fixation in coal ash. By comparison of Na content in ash before and after combustion，the effect of cofiring on Na fixation was evaluated. By comparing the differences of weight loss and mass change rate between theoretical and experimental combustion，the synergistic of cofiring was confirmed. The results show that the Na forms in HSC mainly consist of H2O-soluble，HCl-souble and NH4Ac-soluble Na，while the Na-containing compounds cannot be detected with XRD analysis before and after combustion. Cofiring effectively enhances the residual of Na-containing compounds in ash，the Na retention in ash increases by 50%-75% through cofiring 10% CG with 90% HSC，thus verifying the effectiveness of Na fixation in ash. Meanwhile，cofiring enhances the combustion rate and reduces the peak temperatures of the mixed fuel，and shows obvious synergistic effect. By further optimizing cofiring conditions，it is expected to realize synergistic，efficient and safe conversion of HSC and CG，which favors the energy conservation and emission reduction undoutedly.

0 引言

1 试验

   1.1 试验样品

   1.2 高钠煤及煤矸石中Na含量测定

   1.3 煤矸石矿物组成及元素分析

   1.4 煤矸石与高钠煤的掺烧性能

   1.5 煤矸石与高钠煤掺烧灰渣固钠性能

2 试验结果与分析

   2.1 高钠煤中钠形态及矸石矿物组成

   2.2 高钠煤掺烧煤矸石灰渣固钠性能

   2.3 高钠煤、矸石和燃烧灰渣的矿物组成

   2.4 高钠煤掺烧煤矸石协同转化效应

3 结论