Study on the Uniformity of Secondary Air of a 660 MW Ultra-Supercritical CFB Boiler

Li Nie, Jiayi Lu, Qigang Deng, Liming Gong, Dayong Xue, Zhongzhi Yang and Xiaofeng Lu
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Li Nie: Dongfang Boiler Group Co., Ltd., Chengdu 611731, China
Jiayi Lu: Dongfang Boiler Group Co., Ltd., Chengdu 611731, China
Qigang Deng: Dongfang Boiler Group Co., Ltd., Chengdu 611731, China
Liming Gong: Dongfang Boiler Group Co., Ltd., Chengdu 611731, China
Dayong Xue: Dongfang Boiler Group Co., Ltd., Chengdu 611731, China
Zhongzhi Yang: Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education of PRC, Chongqing University, Chongqing 400044, China
Xiaofeng Lu: Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education of PRC, Chongqing University, Chongqing 400044, China

Energies, 2022, vol. 15, issue 10, 1-12

Abstract: Based on the field test of a 600 MW supercritical circulating-fluidized bed boiler, this paper optimizes the secondary air pipe layout scheme of a 660 MW ultra-supercritical circulating fluidized bed boiler with a similar furnace structure and carried out a numerical simulation on its air distribution uniformity. The secondary air box of the 660 MW ultra-supercritical circulating-fluidized bed boiler adopts a variable section design, and the secondary air branch pipe adopts a separate air inlet mode. The experimental results showed that the oxygen concentration was uniform near the rear wall, but all exhibited a “decrease–increase–decrease” profile along the horizontal line, which indicated that the trajectory of the secondary air jet was first in the shape of bending downward and then upward. To achieve a more uniform secondary air distribution for supercritical CFB boilers, further optimization of the layout of the bellows and branch pipes should be considered. Numerical results showed that the deviation rate of the internal and lower secondary air reached 17%, and there was optimization space for the secondary air branch pipe layout of the boiler. Its uniformity can be increased by adding valves and other measures. The velocity deviation of the secondary air of the 660 MW ultra-supercritical circulating-fluidized bed boiler can be within 3% by means of separate air supply and pipe diameter change, and better uniform air supply can be achieved to reduce the speed deviation by adding valves and adjusting the combustion.

Keywords: ultra-supercritical; circulating-fluidized bed boiler; secondary air; uniformity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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