Effects of Xinjiang high calcium coal co-firing on melting characteristics of Ca-bearing minerals in ash

被引：0
作者：
Chen S. [1 ]
Yu D. [1 ]
Wu J. [1 ]
Xia Y. [1 ]
Wang Y. [2 ,3 ]
Xu M. [1 ]
机构：
[1] State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, 430074, Hubei
[2] Southern Research, National Carbon Capture Center (NCCC), Wilsonville, 35186, AL
[3] Department of Chemical Engineering and Institute for Clean and Secure Energy, University of Utah, Salt Lake City, 84112, UT
来源：
Huagong Xuebao/CIESC Journal | 2020年 / 71卷 / 09期
关键词：
CCSEM; Coal combustion; Melting characteristics; Mixing; Reaction; Slagging;
D O I：
10.11949/0438-1157.20200406
中图分类号：
学科分类号：
摘要：
In this study, a high-calcium coal, a high-silicon-aluminum Xinjiang coal and their blends were burnt in a drop tube furnace. The computer-controlled scanning electron microscope (CCSEM) was used to analyze the total ash mineral composition and particle size distribution after combustion. Based on CCSEM analysis, the composition data of single particle ash was obtained. The thermodynamic equilibrium method was used to calculate the liquid phase ratio of minerals in the ash, and the effect of coal blending on the melting characteristics of calcium-containing minerals in the ash was analyzed. The results show that the organically bound Ca easily interacts with other minerals in the coal. The mineral species of Ca-bearing minerals in the bulk ash mainly depend on the included minerals in coal. Co-firing will promote the conversion of calcium-containing aluminosilicate in the ash to calcium-containing complex aluminosilicate, and at the same time promote the melting of calcium-containing minerals. Under low temperature conditions, the particle size distribution of molten calcium-containing minerals in co-fired coal ash is affected by the particle size distribution of the alkali metal; however, under high temperature conditions, co-firing promotes the migration of molten calcium-containing minerals to large particle size ash. © 2020, Chemical Industry Press Co., Ltd. All right reserved.
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页码：4260 / 4269
页数：9
相关论文
共 30 条
  • [1] Qiu P J., Study on development of Xinjiang coal industry under background of silk road economic belt, Coal Economic Research, 7, pp. 18-23, (2015)
  • [2] Xu J Y, Yu D X, Fan B, Et al., Characterization of ash particles from co-combustion with a Zhundong coal for understanding ash deposition behavior, Energy & Fuels, 28, 1, pp. 678-684, (2014)
  • [3] Pan S H, Chen Q G, Chen X Y., Characteristic analysis of higher-sodium coal of the eastern Jungar and countermeasures for preventing boiler slagging, Energy Engineering, 180, 1, pp. 71-76, (2016)
  • [4] Dai B Q, Wu X J, de Girolamo A, Et al., Inhibition of lignite ash slagging and fouling upon the use of a silica-based additive in an industrial pulverised coal-fired boiler (Part 1): Changes on the properties of ash deposits along the furnace, Fuel, 139, pp. 720-732, (2015)
  • [5] Li J B, Zhu M M, Zhang Z Z, Et al., The mineralogy, morphology and sintering characteristics of ash deposits on a probe at different temperatures during combustion of blends of Zhundong lignite and a bituminous coal in a drop tube furnace, Fuel Processing Technology, 149, pp. 176-186, (2016)
  • [6] Lu Y, Wang Y, Xu Y, Et al., Investigation of ash fusion characteristics and migration of sodium during co-combustion of Zhundong coal and oil shale, Applied Thermal Engineering, 121, pp. 224-233, (2017)
  • [7] Zhou H, Ma W., An experimental study on the effects of adding biomass ashes on ash sintering behavior of Zhundong coal, Applied Thermal Engineering, 126, pp. 689-701, (2017)
  • [8] Zeng X P, Yu D X, Liu F Q, Et al., Scavenging of refractory elements (Ca, Mg, Fe) by kaolin during low rank coal combustion, Fuel, 223, pp. 198-210, (2018)
  • [9] Wang X B, Xu Z X, Wei B, Et al., The ash deposition mechanism in boilers burning Zhundong coal with high contents of sodium and calcium: a study from ash evaporating to condensing, Applied Thermal Engineering, 80, pp. 150-159, (2015)
  • [10] Cui Y K, Zhang X, Wu X J., The effect of coal blending ration on slagging/fouling characteristics of Zhundong Xinjiang high-alkali coal, Journal of Chinese Society of Power Engineering, 35, 5, pp. 361-365, (2015)
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