负载碳酸钾煤焦-CO<sub>2</sub>催化气化反应特性的原位研究

卫俊涛; 丁路; 周志杰; 于广锁

负载碳酸钾煤焦-CO₂催化气化反应特性的原位研究

卫俊涛^1,2,
丁路^1,2,
周志杰^1,2,
于广锁^1,2,

1.
华东理工大学煤气化及能源化工教育部重点实验室, 上海 200237;
2.
上海市煤气化工程技术研究中心, 上海 200237

基金项目: 国家自然科学基金(21376081)和国家高技术研究发展计划(863计划,2012AA053101)资助项目

详细信息

通讯作者:
于广锁,Tel:021-64252974,Fax:021-64251312,E-mail:gsyu@ecust.edu.Cn

中图分类号: TQ546
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出版历程
- 收稿日期: 2015-05-08
- 修回日期: 2015-07-13
- 刊出日期: 2015-11-30

In-situ analysis of catalytic gasification reaction characteristics of coal char-CO₂ with K₂CO₃ additive

WEI Jun-tao^1,2,
DING Lu^1,2,
ZHOU Zhi-jie^1,2,
YU Guang-suo^{1,2
,}

1.
Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;
2.
Shanghai Engineering Research Center of Coal Gasification, Shanghai 200237, China

Funds: The project was supported by the National Natural Science Foundation of China (21376081) and the National High Technology Research and Development Program of China (863 Program, 2012AA053101).

摘要

摘要: 以碳酸钾为催化剂,通过高温热台原位研究气化阶段神府/遵义煤焦与催化剂的交互作用,采用热重分析仪,考察气化温度(750~950℃)、催化剂负载量(钾离子负载量2.2%、4.4%、6.6%(质量分数))对煤焦气化反应性的影响。结果表明,K₂CO₃有利于促进神府/遵义煤热解过程孔隙结构的发展。气化温度低于碳酸钾熔点时,大部分煤焦颗粒与CO₂的反应以颗粒收缩形式进行,当气化温度高于碳酸钾熔点时,对于神府煤焦,随着碳骨架快速消耗,在反应后期可观察到明显的熔融态钾催化剂扩散现象;而对于遵义煤焦,其碳骨架稳定消耗缓慢,大部分熔融态钾催化剂存在于煤焦表面。神府/遵义煤焦气化反应活性随碳酸钾负载量的增加而提高。钾催化剂对神府煤焦的催化作用随气化温度的升高先增强后减弱,转折温度点接近碳酸钾熔点,原因为熔融态钾催化剂流动性好,造成部分孔隙结构堵塞,导致钾催化剂催化作用减弱。
- 原位高温热台 /
- 碳酸钾 /
- 熔融 /
- 催化气化
Abstract: Interactions of catalyst (K₂CO₃) with Shenfu (SF)/Zunyi (ZY) char during gasification were observed by in-situ heating stage microscope. The effects of gasification temperature (750~950℃) and catalyst loading amount (2.2%, 4.4%, 6.6%) were investigated in a thermogravimetric analyzer. The results show that loading K₂CO₃ on SF/ZY stimulates development of pore structure in pyrolysis process. The in-situ heating stage experiments indicates that most of the char particles react with CO₂ in shrinking core mode below the melting point of K₂CO₃. Above this temperature, for SF char, obvious molten potassium catalyst diffusion can be observed in the later reaction stage with rapid consumption of carbon skeleton; but for ZY char, most of the molten potassium exists on the surface of coal char with slower consumption of stable carbon skeleton. Gasification reactivity of SF/ZY char increases with increasing loading amount of K₂CO₃. Catalytic efficiency of potassium catalyst on SF char initially increases and then decreases with gasification temperature, the turning point of gasification temperature is close to the melting point of K₂CO₃. This may be due to blocking of a fraction of pore structure resulted from the good fluidity of molten potassium catalyst.
- in-situ heating stage /
- K₂CO₃ /
- fusion /
- catalytic gasification

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