Open Access

ARTICLE

NUMERICAL SIMULATION OF COMBUSTION IN 300 MW TANGENTIALLY FIRED PULVERIZED HIGH-ALKALI COAL BOILER ON UNDERLOAD OPERATION

Xuehui Jing^a,* , Wei Li^a, Zhaoyu Li^a , Zhiyun Wang^b

a State Grid Xinjiang Electric Power Research Institute, Urumqi 830001, China
b School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
* Xuehui Jing. Email: jingxh0328@163.com

Frontiers in Heat and Mass Transfer 2023, 20, 1-4. https://doi.org/10.5098/hmt.20.19

Abstract

This paper numerically simulates the combustion in a 300MW tangentially fired pulverized high-alkali coal boiler under low-load conditions. The combustion process, temperature distribution and the thermal load in the furnace at different height are analyzed under three different load conditions, which are 30%, 45% and 60% of full load. The temperature distribution and the variation of NO_x concentration under different load conditions are investigated, as well. The results show that the combustion processes of pulverized high-alkali coal in the furnace are similar under different load conditions, but the positions of the fuel’s full combustion are related to the loads. With the load increasing, the high temperature area gradually expands from the burner area to the central area of the furnace and extends to the upper part of the furnace. The distribution of NO_x concentration is significantly related to the loads. The distributions of NO_x concentration at 45% and 60% of full load are roughly similar, and mainly concentrate in the areas near the burner and up the burner area, which are the high temperature regions. But the distribution of NO_x at 30% of full load mainly concentrates in the upper part of the furnace, while the NO_x concentration in the burner area is relatively low.

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Keywords

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