新疆高钙煤混烧对灰中含钙矿物熔融特性影响

doi:10.11949/0438-1157.20200406

化工学报 ›› 2020, Vol. 71 ›› Issue (9): 4260-4269.DOI: 10.11949/0438-1157.20200406

新疆高钙煤混烧对灰中含钙矿物熔融特性影响

陈胜¹(),于敦喜¹(),吴建群¹,夏祎旻¹,王越明^2,³,徐明厚¹

^1.华中科技大学煤燃烧国家重点实验室，湖北武汉 430074
^2.Southern Research, National Carbon Capture Center (NCCC）, Wilsonville, AL 35186, USA
^3.Department of Chemical Engineering and Institute for Clean and Secure Energy, University of Utah, Salt Lake City, UT 84112, USA

收稿日期:2020-04-17 修回日期:2020-05-31 出版日期:2020-09-05 发布日期:2020-09-05
通讯作者: 于敦喜
作者简介:陈胜（1995—），男，硕士研究生，hustercs@hust.edu.cn
基金资助:
国家重点研发计划项目(2016YFB0600601);国家自然科学基金项目(51520105008)

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

Sheng CHEN¹(),Dunxi YU¹(),Jianqun WU¹,Yimin XIA¹,Yueming WANG^2,³,Minghou XU¹

^1.State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
^2.Southern Research, National Carbon Capture Center (NCCC), Wilsonville, AL 35186, USA
^3.Department of Chemical Engineering and Institute for Clean and Secure Energy, University of Utah, Salt Lake City, UT 84112, USA

Received:2020-04-17 Revised:2020-05-31 Online:2020-09-05 Published:2020-09-05
Contact: Dunxi YU

摘要/Abstract

摘要：

选用一种高钙和一种高硅铝新疆煤，在沉降炉中进行不同比例的混煤和单煤燃烧实验。采用计算机控制扫描电镜（CCSEM）分别对燃烧后总灰矿物成分和粒径分布进行分析。基于CCSEM分析获取单颗粒灰成分数据，采用热力学平衡方法对灰中矿物液相比例进行计算，分析混煤燃烧对灰中含钙矿物熔融特性影响。结果表明，煤中有机结合态Ca极易与煤中其他矿物元素发生交互反应，交互反应后含钙矿物种类取决于煤中内在矿种类。混煤燃烧会促进灰中含钙硅铝酸盐向含钙复杂硅铝酸盐转化，同时促进含钙矿物的熔融。在低温条件下，混烧煤灰中熔融含钙矿物粒径分布受碱金属粒径分布影响；但是高温条件下，混烧促进熔融含钙矿物向大粒径煤灰迁移。

关键词: 煤燃烧, 反应, 结渣, 混合, CCSEM, 熔融特性

Abstract:

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.

Key words: coal combustion, reaction, slagging, mixing, CCSEM, melting characteristics

中图分类号:

TK 224

陈胜, 于敦喜, 吴建群, 夏祎旻, 王越明, 徐明厚. 新疆高钙煤混烧对灰中含钙矿物熔融特性影响[J]. 化工学报, 2020, 71(9): 4260-4269.

Sheng CHEN, Dunxi YU, Jianqun WU, Yimin XIA, Yueming WANG, Minghou XU. Effects of Xinjiang high calcium coal co-firing on melting characteristics of Ca-bearing minerals in ash[J]. CIESC Journal, 2020, 71(9): 4260-4269.

图/表 9

表1 燃料特性分析

Table 1 Fuel properties

煤种	工业分析/%(mass,ad)				元素分析/%(mass,ad)
煤种	M	VM	A	FC	C	H	S	N	O（差值）
YK煤	3.6	30.04	36.93	29.43	39.85	3.66	0.25	0.54	15.16
EK煤	5.93	33.61	10.03	50.43	59.06	4.34	0.42	0.69	19.53
灰成分分析/%(mass)
煤种	Na₂O	MgO	Al₂O₃	SiO₂	P₂O₅	SO₃	K₂O	CaO	Fe₂O₃
YK煤	1.41	1.67	26.54	58.30	0.33	1.43	2.18	4.26	3.88
EK煤	6.24	8.26	17.45	28.00	0.78	7.87	1.03	21.64	8.73

表2 原煤含钙矿物分布特性

Table 2 Distribution of Ca-bearing minerals in raw coal

煤种	含量/%（mass）
煤种	钙铝硅酸盐	碳酸钙	钙硅酸盐	有机结合钙
YK煤	22.91	2.72	2.14	72.23
EK煤	3.70	7.22	0.22	88.85

图1 CaO在含钙矿物中的分布特性

Fig.1 Distribution of CaO in Ca-bearing mineral

图2 含钙硅铝酸盐SiO2-Al2O3-CaO三相图

Fig.2 Ternary phase diagram of SiO2-Al2O3-CaO in calcium-containing aluminosilicate

图3 含钙复杂硅铝酸盐SiO2+Al2O3-MgO+Fe2O3+Na2O+K2O-CaO三相图

Fig.3 Ternary phase diagram of SiO2+Al2O3-MgO+Fe2O3+Na2O+K2O-CaO in calcium-containing complex aluminosilicate

图4 总灰灰熔点DT—变形温度； ST—软化温度； FT—流动温度

Fig.4 Melting point of bulk ash

图5 总灰中CaO的液相比例Exp.—实验值； Cal. —计算值

Fig.5 Liquid phase ratio of CaO in bulk ash

图6 不同温度条件下液相CaO在不同粒径飞灰中的分布

Fig.6 Distribution of CaO in liquid phase in fly ash with different particle sizes at different temperatures

图7 碱金属在不同粒径含钙矿物中的分布

Fig.7 Distribution of alkali metals in calcium-containing minerals with different particle sizes

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新疆高钙煤混烧对灰中含钙矿物熔融特性影响

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

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