Review of the characteristics and graded utilisation of coal gasification slag

doi:10.1016/j.cjche.2021.05.007

Chinese Journal of Chemical Engineering ›› 2021, Vol. 35 ›› Issue (7): 92-106.DOI: 10.1016/j.cjche.2021.05.007

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Review of the characteristics and graded utilisation of coal gasification slag

Xiaodong Liu¹, Zhengwei Jin², Yunhuan Jing², Panpan Fan¹, Zhili Qi², Weiren Bao¹, Jiancheng Wang¹, Xiaohui Yan³, Peng Lv⁴, Lianping Dong⁵

1. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China;
2. Institute of Coal Chemical Industry Technology, National Energy Group Ningxia Coal Industry Co. Ltd., Yinchuan 750411, China;
3. China Energy Investment Group Co., Ltd., Beijing 100011, China;
4. State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;
5. College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Received:2020-11-10 Revised:2021-05-01 Online:2021-09-30 Published:2021-07-28
Contact: Panpan Fan, Weiren Bao
Supported by:
This study was financially supported by the National Key Research and Development Program of China (2019YFC1904302), Foundation of State Key Laboratory of High-efficiency Utilisation of Coal and Green Chemical Engineering (2021-K81) and the Technology of Coal-to-liquids Research Institute of National Energy Group ([2020]010).

Review of the characteristics and graded utilisation of coal gasification slag

Xiaodong Liu¹, Zhengwei Jin², Yunhuan Jing², Panpan Fan¹, Zhili Qi², Weiren Bao¹, Jiancheng Wang¹, Xiaohui Yan³, Peng Lv⁴, Lianping Dong⁵

1. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China;
2. Institute of Coal Chemical Industry Technology, National Energy Group Ningxia Coal Industry Co. Ltd., Yinchuan 750411, China;
3. China Energy Investment Group Co., Ltd., Beijing 100011, China;
4. State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;
5. College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China

通讯作者: Panpan Fan, Weiren Bao
基金资助:
This study was financially supported by the National Key Research and Development Program of China (2019YFC1904302), Foundation of State Key Laboratory of High-efficiency Utilisation of Coal and Green Chemical Engineering (2021-K81) and the Technology of Coal-to-liquids Research Institute of National Energy Group ([2020]010).

Abstract

Abstract: The characteristics of the energy structure of rich coal, less oil and less gas, coupling with a high external dependence on oil and natural gas and the emphasis on the efficient and clean utilisation of coal, have brought opportunities for coal chemical industry. However, with the large-scale popularisation of coal gasification technology, the production and resulting storage of coal gasification slag continue to increase, which not only result in serious environmental pollution and a waste of terrestrial resources, but also seriously affect the sustainable development of coal chemical enterprises. Hence, the treatment of coal gasification slag is extremely important. In this paper, the production, composition, morphology, particle size structure and water holding characteristics of coal gasification slag are introduced, and the methods of carbon ash separation of gasification slag, both domestically and abroad, are summarised. In addition, the paper also summarises the research progress on gasification slag in building materials, ecological restoration, residual carbon utilisation and other high-value utilisation, and ultimately puts forward the idea of the comprehensive utilisation of gasification slag. For large-scale consumption to solve the environmental problems of enterprises and achieve high-value utilisation to increase the economic benefits of enterprises, it is urgent to zealously design a reasonable and comprehensive utilisation technologies with simple operational processes, strong adaptability and economic benefits.

Key words: Coal gasification slag, Morphological characteristics, Dehydration, Separation, Comprehensive utilisation

摘要： The characteristics of the energy structure of rich coal, less oil and less gas, coupling with a high external dependence on oil and natural gas and the emphasis on the efficient and clean utilisation of coal, have brought opportunities for coal chemical industry. However, with the large-scale popularisation of coal gasification technology, the production and resulting storage of coal gasification slag continue to increase, which not only result in serious environmental pollution and a waste of terrestrial resources, but also seriously affect the sustainable development of coal chemical enterprises. Hence, the treatment of coal gasification slag is extremely important. In this paper, the production, composition, morphology, particle size structure and water holding characteristics of coal gasification slag are introduced, and the methods of carbon ash separation of gasification slag, both domestically and abroad, are summarised. In addition, the paper also summarises the research progress on gasification slag in building materials, ecological restoration, residual carbon utilisation and other high-value utilisation, and ultimately puts forward the idea of the comprehensive utilisation of gasification slag. For large-scale consumption to solve the environmental problems of enterprises and achieve high-value utilisation to increase the economic benefits of enterprises, it is urgent to zealously design a reasonable and comprehensive utilisation technologies with simple operational processes, strong adaptability and economic benefits.

关键词: Coal gasification slag, Morphological characteristics, Dehydration, Separation, Comprehensive utilisation

Xiaodong Liu, Zhengwei Jin, Yunhuan Jing, Panpan Fan, Zhili Qi, Weiren Bao, Jiancheng Wang, Xiaohui Yan, Peng Lv, Lianping Dong. Review of the characteristics and graded utilisation of coal gasification slag[J]. Chinese Journal of Chemical Engineering, 2021, 35(7): 92-106.

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Review of the characteristics and graded utilisation of coal gasification slag

Review of the characteristics and graded utilisation of coal gasification slag

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