Research Progress of Hydrogenated Pyrolysis of Low-rank Coal Assisted by Biomass Hydrogen-donor
ZHOU Jingjing1, ZHOU Jun1,2,*, WU Lei1,2,*, YANG Rongrong1, SONG Yonghui2,3, ZHANG Qiuli1,2
1 School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 2 Shaanxi Province Metallurgical Engineering and Technology Research Centre, Xi'an 710055, China 3 School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
Abstract: Coal resource plays a crucial role in energy structure of China, but the utilization of low-rank coal meets some great challenges, such as energy waste, environmental pollution, etc. As a green renewable energy, biomass has some advantages of low-cost, high volatile and high H/C ratio. However, lots of hydrogen components in biomass are consumed via low-end utilization, resulting in the resource waste. The co-pyrolysis of low-rank coal and biomass not only changes the characteristics of coal pyrolysis, and improves the yield and quality of pyrolysis products, but makes full use of biomass resource, and alleviates the problem of environmental pollution, which results in the efficient, clean, and graded utilization of low-rank coal and biomass resource. Currently, the researches of co-pyrolysis of low-rank coal and biomass mainly focus on the pyrolysis process optimization, the distribution rule of pyrolysis products, the synergy mechanism of co-pyrolysis and so on. Many works showed that the pyrolysis temperature, heating rate, biomass composition and other factors affected the distribution, yield and quality of products. In addition, compared to traditional pyrolysis, the new type pyrolysis, such as microwave pyrolysis and infrared pyrolysis, can markedly improve the pyrolysis efficiency, the yield and quality of pyrolysis products, which has gradually attracted the attention by scholars at home and abroad. In this paper, the characteristics of pyrolysis product of four kinds of biomass (forest and agricultural products, algae, livestock products and municipal solid waste) assisted hydrogenated pyrolysis reactions of low-rank coalare roundly analyzed, and the hydrogenated co-pyrolysis mechanisms of biomass, such as catalysis of alkalis, radical reactions, and secondary reactions of volatiles, are summarized. In addition, the application of microwave pyrolysis and infrared pyrolysis in the field of co-pyrolysis are also introduced, and the development prospect of co-pyrolysis technology is forecasted.
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