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Preheating Characteristics of Datong Coal in O2/CO2 and Air Atmospheres

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Abstract

Experimental studies were carried out to find the difference of preheating characteristics of Datong coal in O2/CO2 and air atmospheres by a circulating fluidized bed. It is found that pulverized coal could be both steadily preheated to above 800°C in the two different atmospheres, but the temperature distribution was more uniform along the riser in O2/CO2 atmosphere. During the preheating, the content of CO in the flue gas can reach 12.32% under the O2/CO2 atmosphere, far higher than that in air (5.94%). Simultaneously, the conversion rate of fixed carbon was higher in O2/CO2 atmosphere compared with that in air. It can be inferred the higher oxygen concentration and higher partial pressure of CO2 have greatly accelerated the gasification reaction. The BET analysis indicated a number of large pores were transformed into micropores during the preheating progress, and the major contributors for overall pore volume of chars and specific surface area are the micro-pores and the mesopores with diameter ranging from 2 nm to 10 nm. The inner pore structure was more developed in O2/CO2 atmosphere.

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Acknowledgment

The authors gratefully acknowledge the supports of the National Natural Science Foundation of China (No. 51676187).

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Authors and Affiliations

  1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100190, China

    Jianguo Zhu, Hongzhou Ma, Dianbin Liu & Jiarong Li

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Jianguo Zhu, Hongzhou Ma, Dianbin Liu & Jiarong Li

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  1. Jianguo Zhu
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  2. Hongzhou Ma
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  3. Dianbin Liu
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  4. Jiarong Li
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Correspondence to Jianguo Zhu.

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Zhu, J., Ma, H., Liu, D. et al. Preheating Characteristics of Datong Coal in O2/CO2 and Air Atmospheres. J. Therm. Sci. 27, 341–348 (2018). https://doi.org/10.1007/s11630-018-1016-1

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  • DOI: https://doi.org/10.1007/s11630-018-1016-1

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