晋城煤粒度变化对灰熔融性影响规律研究

张渤; 张洪; 杨云飞; 胡光洲; 张鹏启; 伦飞

晋城煤粒度变化对灰熔融性影响规律研究

张渤¹,
张洪^2, ,,
杨云飞²,
胡光洲²,
张鹏启²,
伦飞²

1.
秦皇岛出入境检验检疫局煤炭检测技术中心, 河北秦皇岛 066003
2.
中国矿业大学化工学院, 江苏徐州 221116

基金项目:

国家自然科学基金——山西煤基低碳联合基金 U1510106

详细信息

中图分类号: TQ533
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- 文章访问数: 105
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- 被引次数: 0
出版历程
- 收稿日期: 2018-08-06
- 修回日期: 2018-09-28
- 网络出版日期: 2021-01-23
- 刊出日期: 2018-12-10

Study on the influence of particle size on the ash melting behavior of Jincheng coal

1.
Qinhuangdao Entry-Exit Inspection and Inspection Bureau Coal Detection Technology Center, Qinhuangdao 066003, China
2.
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China

Funds:

the National Natural Science Foundation of China and Shanxi Low Carbon Coal Foundation U1510106

More Information

Corresponding author: ZHANG Hong, E-mail: hzhang@cumt.edu.cn

摘要

摘要: 探索山西晋城煤在灰熔聚流化床气化过程中的结渣机理。采用山西晋城无烟煤，将其破碎到不同粒径，采用XRF、XRD、AFT、SEM和FactSage^TM研究了煤的灰分、煤灰化学组成、矿物组成和熔融性随煤样粒径变化规律。结果发现，对于破碎到6 mm以下的晋城煤样，不同粒径子样煤灰化学组成和熔融温度差异不大；对于粉磨到0.2 mm以下的晋城煤粉样品，不同粒径子样化学组成和矿物组成存在较大差异，其中，铁含量差异最明显。AFT和SEM结果都证明， < 45 μm粒径煤粉子样煤灰熔融温度明显高于其他三种样品。FactSage^TM计算得到的液相量变化规律和AFT、SEM观察结果一致，说明煤灰熔融性随粒径变化是煤灰化学成分离析造成的，而SiO₂-Al₂O₃-Fe₂O₃三元相图较好地解释了晋城煤煤灰熔融性随粒径变化机理。
- 晋城煤 /
- 灰熔聚流化床 /
- 灰熔融温度 /
- 结渣
Abstract: The slagging mechanism of the Jincheng coal in the ash-agglomerate fluidized bed gasification was explored. A typical Jincheng coal sampled from Shanxi, China was prepared into different particle size and the XRF, XRD, AFT, SEM and FactSage^TM were employed to study the influence of particle size on the ash content, chemical and mineral composition and ash fusibility. The results indicate that the ash chemical composition and AFTs vary little with size below 6 mm. For the pulverized samples below 0.2 mm, there are apparent differences in the chemical composition and mineral composition, especially in Fe₂O₃. Both AFT results and SEM observations show that the sample with particle size less than 45 μm has a significantly higher melting temperature than the other three samples. The slag contents calculated with FactSage^TM are consistent with the AFT results and SEM observations, which indicates that the change of ash melting behavior with particle size results from the change in chemical composition. The ternary phase diagram of SiO₂-Al₂O₃-Fe₂O₃ can be used successfully to explain the mechanism of the change of ash melting behavior with particle size for Jincheng coal.
- Jincheng coal /
- ash-agglomerate fluidized bed /
- ash fusion temperature /
- slagging

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图 1 晋城碎煤的粒径组成及其灰分

Figure 1 Size distribution of crushed Jincheng coal sample and its relationship with ash content

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图 2 晋城煤粉的粒径组成及其灰分

Figure 2 Size distribution of pulverized Jincheng coal and its relationship with ash content

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图 3 晋城煤煤灰化学组成随破碎粒径的变化

Figure 3 Change of ash chemical composition with size fractions in crushed Jincheng coal sample

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图 4 不同粒径晋城煤粉的XRD谱图

Q: quartz；C: calcite；H: hematite；Mu: muscovite；A: anhydrite

Figure 4 XRD graphs of different size fractions in pulverized Jincheng coal sample

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图 5 晋城煤粉灰熔融温度随粒径的变化

Figure 5 Change of ash fusion temperatures for pulverized Jincheng coal samples with particle size

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图 6 1300 ℃下晋城煤粉不同粒径样品灰熔融SEM照片

Figure 6 SEM pictures of coal ash for pulverized Jincheng samples with different particle sizes at 1300 ℃

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图 7 1500 ℃下晋城粉煤不同粒径样品灰熔融SEM照片

Figure 7 SEM pictures of coal ash for pulverized Jincheng samples with different particle sizes at 1500 ℃

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图 8 晋城煤粉不同粒径灰分样品液相含量随温度变化

Figure 8 Change of liquid content with temperature for pulverized Jincheng coal samples with different sizes

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图 9 不同粒径晋城煤粉样品在SiO₂-Al₂O₃-Fe₂O₃三元相图中的分布

Figure 9 Mineral distribution of Jincheng coal samples with different sizes in SiO₂-Al₂O₃-Fe₂O₃ ternary phase diagram

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表 1 晋城原煤的工业分析和元素分析

Table 1 Proximate analysis and ultimate analysis of Jincheng raw coal

Proximate analysis w/%				Ultimate analysis w/%
M_ad	A_d	V_d	FC_d	C_daf	H_daf	N_daf	O_daf^*	S_{t, d}
4.49	19.24	7.78	72.98	88.60	3.24	1.11	3.94	3.11
^*：by difference

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表 2 晋城原煤煤灰化学组成含量

Table 2 Chemical composition of Jincheng raw coal ash

Content w/%
SiO₂	Al₂O₃	CaO	Fe₂O₃	MgO	TiO₂	P₂O₅	K₂O	Na₂O	SO₃
47.50	33.05	3.07	8.39	1.12	1.17	0.06	0.96	0.18	2.20

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表 3 晋城煤粉不同粒径煤灰化学组成

Table 3 Ash chemical composition of size fractions in pulverized Jincheng coal sample

d/μm	Content w/%
d/μm	SiO₂	Al₂O₃	CaO	Fe₂O₃	MgO	TiO₂	P₂O₅	K₂O	Na₂O	SO₃
＜45	59.37	33.78	3.20	6.55	1.06	1.06	0.06	1.00	0.18	1.52
45-75	55.18	30.56	3.20	13.77	1.59	1.32	0.06	0.60	0.12	2.65
75-105	55.21	31.83	2.75	15.67	1.01	1.10	0.06	0.58	0.10	2.10
>105	55.29	33.58	2.16	13.00	1.05	1.16	0.06	0.65	0.09	1.50

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