准东煤灰渣烧结熔融过程中钠基化合物作用机理研究

韩克鑫; 黄镇宇; 王智化; 周俊虎

准东煤灰渣烧结熔融过程中钠基化合物作用机理研究

浙江大学能源清洁利用国家重点实验室热能工程研究所, 浙江杭州 310027

基金项目: 国家重点基础研究发展规划(973计划, 2012CB214906).

详细信息

通讯作者:
黄镇宇,E-mail:huangzy@zju.edu.cn.

中图分类号: TK224.9
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- 被引次数: 0
出版历程
- 收稿日期: 2014-06-25
- 修回日期: 2014-09-26
- 刊出日期: 2015-01-30

Action mechanism of sodium compounds in Zhundong coal ash on the process of sintering and fusion

State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China

摘要

摘要: 将Na₂CO₃添加剂按折算为Na₂O以20%的比例掺入煤灰中制成混合灰样,对混合灰样在不同温度下烧结.对不同温度下的烧结灰进行EDS元素分析和XRD物相分析,探究钠基化合物在准东煤灰烧结过程中的转变机理.并以EDS分析结果为基础用Fact sage 5.2计算软件中的Equilib模块进行化学热力学平衡反应计算.结果表明,随着烧结温度的升高,硫会发生富集,而钠主要和硫反应生成Na₂SO₄.同时会有NaCl的产生,NaCl会与含钾化合物反应置换出KCl.NaCl、KCl和Na₂SO₄与其他物质产生低温共熔物.
- 准东煤 /
- 烧结 /
- 钠基化合物 /
- X-射线衍射
Abstract: Na₂CO₃ was added into coal ash with the amount of 20% which was converted into the weight of Na₂O. Then the mixed coal ash samples were sintered under different temperatures. To explore the transition mechanism of sodium compounds in the sintering process, the EDS elemental analysis method and XRD phase analysis method were used to analyze the sintered ash samples. Then chemical thermodynamic equilibrium calculations were carried out on the basis of EDS analysis results with the Equilib module of the Fact sage 5.2 software. And the results were compared with those of the experiment. Results show that sulfur enrichment will occur as the elevating of temperature. Sodium mainly reacts with sulfur to compose Na₂SO₄. At the same time NaCl occurs, and it will react with the potassium compounds to generate KCl. NaCl, KCl and Na₂SO₄ react with other substances to produce low temperature eutectics.
- Zhundong coal /
- sintering /
- sodium compounds /
- XRD

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参考文献(20)

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