煤中负载氢氧化钙对催化气化和甲烷化反应的影响

陈兆辉; 刘雷; 武恒; 裴增楷; 湛月平; 李克忠; 郑岩; 吴丽锋; 毕继诚

煤中负载氢氧化钙对催化气化和甲烷化反应的影响

陈兆辉¹,
刘雷¹,
武恒¹,
裴增楷¹,
湛月平¹,
李克忠^1, ,,
郑岩¹,
吴丽锋¹,
毕继诚^{1, 2}

1.
新奥科技发展有限公司煤基低碳能源国家重点实验室, 河北廊坊 065001
2.
中国科学院山西煤炭化学研究所煤转化国家重点实验室, 山西太原 030001

基金项目:

国家重点基础研究发展规划 2011CB201305

详细信息

中图分类号: TQ530.2
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- 被引次数: 0
出版历程
- 收稿日期: 2016-05-12
- 修回日期: 2016-07-12
- 网络出版日期: 2021-01-23
- 刊出日期: 2016-10-10

Effect of Ca(OH)₂ catalyst on catalytic coal gasification and methanation

1.
State Key Laboratory of Coal-based Low Carbon Energy, ENN Group, Langfang 065001, China
2.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

More Information

Corresponding author: E-mail: nyyjy@enn.cn

摘要

摘要: 以不连沟次烟煤为研究对象，在加压固定床中研究Ca（OH）₂对煤气化及负载Ca（OH）₂煤热解半焦的甲烷化反应活性。结果表明，煤中添加Ca（OH）₂能够明显促进气化反应的进行和甲烷的生成，随着气化温度的升高和负载量的增加，碳转化率增加，但负载量存在饱和点。不同的催化剂负载方式对Ca的分散有一定的影响，进而影响其催化性能。含有Ca的半焦能够明显促进甲烷化的进行，出口气甲烷含量随甲烷化温度和催化剂负载量的升高而增强。采用红外光谱分析揭示了煤负载Ca（OH）₂的离子交换机理和扩散过程，这一过程影响煤气化反应性能。
- 催化气化 /
- Ca(OH)₂ /
- 甲烷化 /
- 半焦
Abstract: The catalytic gasification performance of Buliangou coal using Ca(OH)₂ as catalyst was investigated at 3.5 MPa and 700-800℃ in a pressurized fixed bed. The effect of gasification temperature, Ca(OH)₂ loading and loading method on coal steam gasification and methanation reaction were examined. The results show that Ca(OH)₂ can enhance the reactivity of char gasification and the formation of CH₄. Increasing temperature and Ca(OH)₂ loading can heighten the carbon conversion, but Ca(OH)₂ loading possesses a saturation point. The gasification reactivity is affected by loading method which determines the Ca(OH)₂ dispersion. The coal char loaded with Ca(OH)₂ shows a great catalytic activity on methanation reaction and the CH₄ content in the product gas increases with the increase of methanation temperature and catalyst loading. The analysis result of coal surface function groups by FT-IR reveals the dispersion mechanism of Ca(OH)₂ into the matrix of coal through ion exchange and diffusion, which is a key factor to improve coal char gasification reactivity.
- catalytic gasification /
- Ca(OH)₂ /
- methanation /
- coal char

HTML全文

图 1 加压固定床反应器示意图

Figure 1 Schematic diagram of the pressurized fixed-bed reactor apparatus

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图 2 温度对原煤半焦和浸渍Ca(OH)₂半焦化性能的影响

Figure 2 Effect of temperature on gasification reactivity of coal char with and without Ca(OH)₂

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图 3 催化剂负载量对气化率的影响

Figure 3 Effect of catalyst loading on carbon conversion

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图 4 催化剂负载量对甲烷收率的影响

Figure 4 Effect of catalyst loading on CH₄ yield

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图 5 不同催化剂负载方式对碳转化率的影响

Figure 5 Effect of loading method on carbon conversion

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图 6 添加CaO对产品组成的影响

Figure 6 Effect of CaO addition on product distribution

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图 7 添加CaO对CO₂释放的影响

Figure 7 Effect of CaO addition on CO₂ emission

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图 8 添加CaO对CH₄释放的影响

Figure 8 Effect of CaO added on CH₄ emission

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图 9 不同半焦对甲烷化的影响

Figure 9 Effect of different chars on methanation activity

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图 10 钙催化剂的甲烷化反应活性

Figure 10 Methanation activity over calcium catalysts

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图 11 煤负载Ca(OH)₂的红外光谱谱图

Figure 11 FT-IR spectra of coal loaded with Ca(OH)₂

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表 1 煤样的工业分析及元素分析

Table 1 Proximate and ultimate analyses of coal sample

Proximate analysis w_ad/%				Ultimate analysis (dry and ash free basis ) w_daf/%
M	A	V	FC	C	H	O^a	N	S
2.76	19.02	28.65	49.57	77.55	4.58	15.49	1.36	1.02
^a : by difference

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表 2 灰组成分析

Table 2 Ash composition

Composition of ash w/%
SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	TiO₂	SO₃	P₂O₃	/p>K₂O	Na₂O
28.01	48.15	7.13	9.11	1.09	1.99	2.83	0.45	0.27	0.28
ash fusion point: DT = 1 447 ℃, ST > 1 500 ℃, HT > 1 500 ℃, FT > 1 500 ℃

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