Particulate concentration enrichment of primary air in pulverized coal boilers--颗粒学报PARTICUOLOGY

Zhang, H., & Xu, X. (2004). Particulate concentration enrichment of primary air in pulverized coal boilers. China Particuology, 2(5), 230-233. https://doi.org/10.1016/S1672-2515(07)60064-5

Particulate concentration enrichment of primary air in pulverized coal boilers

Hai Zhang ^*, Xiuqing Xu

Key Laboratory of Thermal Science and Power Engineering, Department of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China

10.1016/S1672-2515(07)60064-5

Volume 2, Issue 5, October 2004, Pages 230-233

Received 8 June 2004, Accepted 24 August 2004, Available online 27 November 2007.

E-mail: haizhang@mail.tsinghua.edu.cn

Highlights

Abstract

Particulate concentration enrichment (PCE) of primary air favors flame ignition and stabilization, and the reduction of NOx emission in pulverized coal combustion. The methods used for PCE are summarized in five categories: Cyclone PCE, Elbow PCE, Blunt-body PCE, Hydrodynamic PCE and Swirling PCE. Practice of each PCE method is illustrated with typical burners and the associated pros and cons are discussed. It is found that the same principle prevails in all PCE methods, that is, due to inertial difference, solid particles preferentially decelerate and separate from the gas stream when the main flow deviates in flow orientation. From analysis of various P-C burners, PCE design is deemed to yet comprise “rule of thumb” practice. Some discussions regarding PCE application are given.

Graphical abstract

Keywords

particulate concentration enrichment (PCE); boilers; separation; two-phase flow

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