Experimental Study on Product Characteristics of Typical Pulverized Coal Preheated by a Self-Preheating Burner

doi:10.1007/s11630-023-1848-1

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Journal of Thermal Science ›› 2023, Vol. 32 ›› Issue (5) : 1912-1934. DOI: 10.1007/s11630-023-1848-1 CSTR: 32141.14.JTS-023-1848-1

Combustion and reaction

Experimental Study on Product Characteristics of Typical Pulverized Coal Preheated by a Self-Preheating Burner

ZHANG Jinyang^1,2, OUYANG Ziqu^1,2,3*, DING Hongliang^2,3, SU Kun^2,3

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Abstract

As the major primary energy source in China, coal has been proved to be capable to improve its physical and chemical characteristics by the pretreatment of the self-preheating burner. In this study, the effects of altering operating conditions including preheating temperature (T_p) and primary air equivalence ratio (λ_p) on preheating characteristics of three typical pulverized coal were investigated on a bench-scale test rig. The high-temperature coal gas compositions along the axis of the riser and at the outlet of the self-preheating burner were measured, and the coal char and coal tar produced in the preheating process were collected and analyzed separately. The results indicated that with the significant release of volatile and the occurrence of chemical reactions, cracks and micropores emerged on the surface of the particles, making the pore structure on the surface more developed, and T_p had the most significant effect on the structure of coal particles. Additionally, there were evident differences in the corresponding operating conditions when the preheating characteristics of the three typical coal reached optimally. And preheating had the strongest influence on the degree of anthracite modification. With respect to coal tar, the increase of T_p and λ_p further promoted its secondary cracking and oxidation, resulting in a decrease in production yield. In this study, for bituminous coal and lignite, a large amount of coal tar were produced during preheating and the highest production yields could reach 5.74% and 6.15%, respectively. While for anthracite, the production yield was intensely low due to its own coal properties, all below 1.02%.

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self-preheating / fuel modification / product characteristics / coal particle structure / coal tar

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ZHANG Jinyang, OUYANG Ziqu, DING Hongliang, SU Kun. Experimental Study on Product Characteristics of Typical Pulverized Coal Preheated by a Self-Preheating Burner[J]. Journal of Thermal Science, 2023, 32(5): 1912-1934 https://doi.org/10.1007/s11630-023-1848-1

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This study was supported by CAS Project for Young Scientists in Basic Research (YSBR-028), Strategic Priority Research Program of the Chinese Academy of Sciences (XDA21040100) and Youth Innovation Promotion Association of the Chinese Academy of Sciences (2019148).

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

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