Citation: JIN Hu, WANG Ze-an, YANG Wei, NING Jian, XIE Yi-hao, LIU Hao. Melting behavior and heterogeneous reaction of Na-bearing deposits at high temperature during high-alkali coal combustion[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(1): 31-38. shu

Melting behavior and heterogeneous reaction of Na-bearing deposits at high temperature during high-alkali coal combustion

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

Corresponding author: LIU Hao, liuhao@hust.edu.cn
Received Date: 23 July 2018
Revised Date: 28 October 2018

Fund Project: the National Key Research and Development Program of China 2017YFC0703100the National Natural Science Foundation of China 51276074The project was supported by the National Key Research and Development Program of China (2017YFC0703100) and the National Natural Science Foundation of China (51276074)

Figures(7)

The pure chemicals were used to simulate the composition of typical ash deposits on heat exchanger surfaces during high-alkali coal combustion, and the thermal mechanical analysis (TMA), TG-DSC analysis and high-temperature calcination were performed to investigate the high temperature melting characteristics of the deposits with varying content of Na₂SO₄. Subsequently, XRD and SEM-EDS techniques were applied to investigate the reaction products and detailed mechanism. The results indicate that the melting characteristic temperature of deposits decreases significantly after blending with Na₂SO₄, and the transformation of Na₂SO₄ is closely related to the blending ratio. When the blending ratio is below 20% (mass ratio), most Na₂SO₄ is converted to CaSO₄ and sodium aluminosilicate, while Na₂SO₄ would react with CaSO₄ and generate sulfate double salts when the blending ratio is over 40%. Moreover, the particles of Na₂SO₄ enriched deposits begin to adhere at 800℃. When the temperature is elevated to 900-950℃, the low-temperature eutectics are easily formed in the presence of nepheline and albite, and the eutectics and Na-Ca sulfate double salts are gradually molten. The large amount of co-melting of akermanite and Ca-bearing minerals was observed at temperatures of 1200-1250℃, and the minerals are completely melted at temperatures over 1300℃.
- sodium sulfate,
- thermal mechanical analysis,
- ash deposits,
- melting,
- heterogeneous reaction
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沈阳化工大学材料科学与工程学院沈阳 110142

Melting behavior and heterogeneous reaction of Na-bearing deposits at high temperature during high-alkali coal combustion

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com