弱还原气氛下水稻秸秆对晋城无烟煤的助熔机理

秦育红; 韩晴晴; 任伟平; 赵子兵; 冯杰; 李文英; 高松平

弱还原气氛下水稻秸秆对晋城无烟煤的助熔机理

秦育红¹,
韩晴晴¹,
任伟平¹,
赵子兵¹,
冯杰^2, ,,
李文英²,
高松平^{2, 3}

1.
太原理工大学化学化工学院, 山西太原 030024
2.
太原理工大学煤科学与技术教育部和山西省重点实验室, 省部共建国家重点实验室培育基地, 山西太原 030024
3.
太原工业学院化学与化工系, 山西太原 030008

基金项目:

国家自然科学基金 21376158

国家青年科学基金 21206104

煤科学与技术省部共建国家重点实验室培育基地开放课题基金 MKX鄄201503

详细信息

中图分类号: TQ531.9
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- 被引次数: 0
出版历程
- 收稿日期: 2016-07-27
- 修回日期: 2016-09-18
- 网络出版日期: 2021-01-23
- 刊出日期: 2016-12-10

Fluxing mechanism of rice straw for Jincheng anthracite under weak reducing atmosphere

1.
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2.
State Key Laboratory Breeding Base of Coal Science and Technology Co-founded by Shanxi Province and the Ministry of Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China
3.
Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China

More Information

Corresponding author: Tel: 0351-6018957, Fax: 0351-6018453, fengjie@tyut.edu.cn

摘要

摘要: 以高灰熔点的晋城无烟煤和水稻秸秆为研究对象，通过CaO-Al₂O₃-SiO₂三元相图、X射线衍射分析（XRD）和扫描电镜耦合X射线能谱分析（SEM-EDX）研究了弱还原气氛下水稻秸秆对晋城无烟煤的助熔机理。随着水稻秸秆添加比例的增加，灰熔融特征温度呈下降趋势，灰中碱性氧化物CaO、Na₂O和K₂O含量增多，结渣指数R_b/a值在0.20-0.69；当水稻秸秆添加量为20%（质量分数）时，流动温度（FT）降低至1 369℃，可满足气化炉液态排渣的要求；水稻秸秆的添加降低了灰中液相出现的温度，增加了液相物质出现的比例和几率，使灰更易发生熔融；混合灰中所形成的钠长石等低熔点矿物质以及钙长石、石英和莫来石所形成的低温共熔物导致灰熔点降低。
- 晋城无烟煤 /
- 水稻秸秆 /
- CaO-Al₂O₃-SiO₂相图 /
- 矿物质 /
- 助熔机理
Abstract: The fluxing mechanism of rice straw for Jincheng anthracite with high ash fusion temperatures was investigated under weak reducing atmosphere by CaO-Al₂O₃-SiO₂ ternary phase diagram, X-ray diffraction (XRD) and scanning electron microscopy coupled with energy dispersive X-ray spectrometry (SEM-EDX). The fusion temperatures of blended ash decrease, and the content of basic oxide CaO, Na₂O and K₂O increases with increment of rice straw addition. The slagging index R_b/a is between 0.20 and 0.69. The fluid temperature (FT) declines to 1 369℃ by adding 20% rice straw, which could satisfy requirement of liquid slag discharge for gasifier. The addition of rice straw reduces the initial temperature and increases the occurrences proportion and probability of liquid phase in the ash. The formation of crystal albite with low melting point and eutectics formed from anorthite, quartz and mullite lead the decrease of ash fusion temperatures.
- Jincheng anthracite /
- rice straw /
- CaO-Al₂O₃-SiO₂ternary phase diagram /
- mineral matter /
- fluxing mechanism

HTML全文

图 1 不同水稻秸秆添加比例对灰熔融特征温度的影响

Figure 1 Effect of different BRs of rice straw on the ash fusion characteristic temperatures

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图 2 不同水稻秸秆添加比例对灰化学组成的影响

Figure 2 Effect of different BRs of rice straw on the chemical compositions of ash

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图 3 混合灰样在CaO-Al₂O₃-SiO₂三元相图中的位置

Figure 3 Location of mixed ash samples in CaO-Al₂O₃-SiO₂ ternary phase diagram

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图 4 灰样在不同热处理温度下的XRD谱图

Figure 4 XRD patterns of ashes at different heat-treatment temperatures

(a): Jincheng coal ash (CA); (b): rice straw ash (BA); (c): mixed ash (MA) Q: quartz (SiO₂); I: illite (K_1.5Al₄(Si_6.5Al_1.5) O₂₀(OH)₄); H: hematite (Fe₂O₃); M: mullite (3Al₂O₃·2SiO₂); He: hercynite (FeO·Al₂O₃); A: anhydrite (CaSO₄); K: kaliophilite (KAlSiO₄); Au: augite (Ca (Mg, Fe) Si₂O₆); W: wollastonite (CaO·SiO₂); Al: albite (NaAlSi₃O₈); An: anorthite (CaAl₂Si₂O₈)

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图 5 灰样在不同热处理温度下的SEM-EDX照片

Figure 5 SEM-EDX images of ash samples at different heat-treatment temperatures

(a): CA-1000℃; (b): CA-1200℃; (c): BA-575℃; (d): BA-900℃; (e): MA-1000℃; (f): MA-1200℃

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表 1 晋城无烟煤和水稻秸秆的工业分析和元素分析

Table 1 Proximate and ultimate analysis of Jincheng anthracite and rice straw

Feedstock	Proximate analysis w/%				Ultimate analysis w_daf/%
Feedstock	M_ad	A_d	FC_daf	V_daf	C	H	O^*	N	S
Jincheng coal	0.95	21.40	89.79	10.21	87.94	3.22	5.32	1.10	2.42
Rice straw	5.83	15.79	14.65	85.35	45.91	2.88	48.50	0.93	1.78
^*: by difference

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表 2 晋城无烟煤灰与水稻秸秆灰的化学组成及灰熔融特征温度

Table 2 Chemical compositions and fusion temperatures of ash from Jincheng anthracite and rice straw

Sample	Chemical composition w/%									Ash fusion temperature t/°C
Sample	SiO₂	Al₂O₃	TiO₂	Fe₂O₃	CaO	MgO	K₂O	Na₂O	SO₃	DT	ST	HT	FT
Jincheng ash	49.37	31.94	1.46	11.10	2.91	1.12	0.80	0.57	0.73	>1500
Rice straw ash	42.68	5.03	1.56	2.74	13.37	6.76	11.45	5.52	10.89	1090	1127	1130	1133
DT：deformation temperature；ST：soften temperature；HT：hemispherical temperature；FT：fusion temperature

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表 3 不同水稻秸秆添加比例下混合原料灰产率的实验值与计算值

Table 3 Experimental and calculated value of ash yield from blended Jincheng coal with different BRs of rice straw

	Ash yield w/%
	0%	2%	4%	8%	10%	20%	50%	80%	100%
Experimental	24.14	23.60	23.57	23.38	22.91	22.79	20.36	17.92	15.82
Calculated	-	24.01	23.81	23.47	22.89	22.84	19.98	17.48	-

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