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Experimental study on structural optimization of a supercritical circulating fluidized bed boiler with an annular furnace and six cyclones

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Abstract

Annular furnace CFBs with six cyclones represent new designs for large capacity CFB boilers over 660 MW. To investigate the gas-solid flow non-uniformity and its main influencing factors, an experimental study was carried out in the cold-test rig of an annular furnace CFB with six cyclones. The influence of furnace structure and cyclone arrangement on the non-uniformity of gas-solid flow was obtained. On the basis of these findings, the structure of the annular furnace CFB with six cyclones was optimized, and an optimal structure was obtained. The results show that for newly designed annular furnace CFBs, the non-uniformity of gas-solid flow among loops is no greater than that of traditional CFBs. In terms of uniformity, side cyclones rotating inward are superior to those rotating outward. The position of the side cyclones determines the basic solid circulating rate distribution trend and can dramatically improve flow non-uniformity. The middle cyclone positions and the symmetric modes of the cyclones do not determine the solid circulating rate distribution trend and have less effect onDEV Gs. Forty-five degree chamfers of outer ring walls can reduce wall erosion and the non-uniformity of gas-solid flow in the circulating fluidized bed. Regarding the operating and structural conditions in this work, the optimal structure of annular furnace CFBs is Type 6: side cyclones rotating inward and b = a/2, d = 0.1c; the center of the middle cyclone inlet located at the centerline of the furnace cross-section; cyclones on the two sides of the furnace in an axisymmetric arrangement; and a furnace corner shape of 45° chamfers. Under the given operating conditions, the DEV Gs for the optimal structure are approximately 4.0%~10.3%.

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Acknowledgment

The work is supported by the Strategic Priority Research Program of the Chinese Academy of Sciences, Grant No. XDA07030100, and the authors gratefully acknowledge their financial support.

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Authors and Affiliations

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

    Xiaofang Wang, Daping Shuai & Qinggang Lyu

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

    Xiaofang Wang, Daping Shuai & Qinggang Lyu

Authors
  1. Xiaofang Wang
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  2. Daping Shuai
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  3. Qinggang Lyu
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Correspondence to Xiaofang Wang.

Additional information

The work is supported by the Strategic Priority Research Program of the Chinese Academy of Sciences, Grant No. XDA07030100, and the authors gratefully acknowledge their financial support.

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Wang, X., Shuai, D. & Lyu, Q. Experimental study on structural optimization of a supercritical circulating fluidized bed boiler with an annular furnace and six cyclones. J. Therm. Sci. 26, 472–482 (2017). https://doi.org/10.1007/s11630-017-0964-1

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  • DOI: https://doi.org/10.1007/s11630-017-0964-1

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