Experimental Study on Ignition of Blended Coal in W-Flame Boiler with Swirl Burners

doi:10.11930/j.issn.1004-9649.201804131

Abstract

Abstract: The ignition characteristics of coal blends with lean coal, anthracite and bituminous coal are studied on a W-flame boiler in a power plant. The temperature of pulverized coal air is measured near the burners. Then the variation of axial pulverized coal airflow temperature is analyzed before and after blending the bituminous coal. The axial pulverized coal airflow temperature with respect to different proportions of the lean coal and the anthracite is also analyzed. Finally the variation of axial pulverized coal airflow temperature between side wall burner and middle burner is compared. It is found that the blended coal powder are burned twice. The lean coal which is easier to be ignited burns first. When the bituminous coal gradually burns out, the temperature of the pulverized coal airflow starts to drop down a little. Then after the anthracite with higher ignition temperature begins to burn, the pulverized coal airflow temperature rises again. If the lean coal is blended with anthracite, the temperature of pulverized coal will decrease and the ignition distance will be extended gradually with the increase of anthracite ratio. The furnace wall and mild air leakage cause the temperature decrease of the pulverized coal airflow such that more heat will be needed for the pulverized coal combustion, which eventually delays the ignition of the burner near the side wall.

Key words: blended coal, ignition, boiler, W-flame, bituminous coal, lean coal, anthracite

CLC Number:

TK01

JIA Yonghui, LI Xin, ZHANG Yongsheng, AN Guoyin, YAN Huibo, MA Hui. Experimental Study on Ignition of Blended Coal in W-Flame Boiler with Swirl Burners[J]. Electric Power, 2018, 51(9): 34-38,45.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201804131

https://www.electricpower.com.cn/EN/Y2018/V51/I9/34

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