Numerical Study on Effects of Flue Gas Recirculation on Combustion and Heat Transfer Characteristics in 660MW Double-reheat Tower-type Boiler

被引：0
|
作者：
Dong L. [1 ]
Yao Q. [1 ]
Jin X. [1 ]
Deng L. [1 ]
Che D. [1 ]
机构：
[1] State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Shaanxi Province, Xi’an
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 18期
关键词：
combustion and heat transfer characteristics; double-reheat; flue gas recirculation; heat flux; modeling method on heating surface; numerical simulation;
D O I：
10.13334/j.0258-8013.pcsee.221096
中图分类号：
学科分类号：
摘要：
In order to provide reference for design optimization of double-reheat boiler and operating temperature regulation, the effects of flue gas recirculation on combustion and heat transfer characteristics are studied based on a 660 MW double-reheat tower-type boiler by numerical simulation. The user-defined function approach predicates the CO reduction effect on NOx. The numerical results show that it is optimal to simplify the convective heating surfaces into a plane among the three modeling methods for the upper heating surfaces in furnace. The recirculating flue gas could improve the burnout rate. The flue gas could shrink the high temperature area (1565~1700K) in burner area and improve the outlet temperature of low-temperature superheater. When the flue gas recirculation ratio increases to 20%, the oxygen concentration in the burner area and CO concentration at the hopper decrease. The NOx emission at low temperature superheater outlet decreases from 143.69 to 94.07mg‧m-3 (6% O2). The ratio of heat absorption of water-cooled wall to total heat absorption decreases by 3.50%, but those ratios of reheater, superheater and economizer increase by 2.53%, 2.13% and 0.54%, respectively. The heat flux is symmetrically distributed in the center line of the furnace. The peak of heat flux is about 330kW‧m-2. Flue gas recirculation technology shrinks the high flux area and improves the safety of boiler operation. ©2023 Chin.Soc.for Elec.Eng.
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页码：7150 / 7159
页数：9
相关论文
共 25 条
  • [1] Nation electricity industry statistics of 2021, National Grid News，2022-01-27(001)
  • [2] YU Ji'an, LIU Hezhong, WU Huanqi, Development and engineering demonstration of high efficiency and flexible double-reheat generators in China[J], Proceedings of the CSEE, 39, S1, pp. 193-202, (2019)
  • [3] MA K, LI C F, YAN W P, Effect of flue gas recirculation on reheated steam temperature of a 1000MW ultra-supercritical double reheat boiler[J], IOP Conference Series：Earth and Environmental Science, 146, (2018)
  • [4] ZHANG Guoqiang, Wenlong XU, WANG Xiuyan, Analysis and optimization of a coal-fired power plant under a proposed flue gas recirculation mode[J], Energy Conversion and Management, 102, pp. 161-168, (2015)
  • [5] Wei XU, ZHANG Jian, FAN Haojie, Study on the steam temperature characteristic of a 660MW flexible double-reheat boiler based on response surface analysis [J], Journal of Engineering for Thermal Energy and Power, 35, 2, pp. 110-116, (2020)
  • [6] WANG Lin, YANG Bo, GAO Jinghui, Adjustment on reheat steam temperature for a 660MW double-reheat boiler[J], Thermal Power Generation, 46, 8, pp. 91-95, (2017)
  • [7] ZHUANG Zhengning, LI Jun, Boilers, (2008)
  • [8] Qiongliang ZHA, Debo LI, Chang'an WANG, Numerical evaluation of heat transfer and NOx emissions under deep-air-staging conditions within a 600 MWe tangentially fired pulverized-coal boiler[J], Applied Thermal Engineering, 116, pp. 170-181, (2017)
  • [9] ZHANG Dalong, MENG Chenwei, ZHANG Hai, Studies on heat flux distribution on the membrane walls in a 600MW supercritical arch-fired boiler[J], Applied Thermal Engineering, 103, pp. 264-273, (2016)
  • [10] JIN Donghao, LIU Xin, ZHANG Xiaoyuan, A coupled model for predicting the tube temperature of platen superheater of coal-fired boiler[J], Proceedings of the CSEE, 42, 24, pp. 8951-8960, (2022)
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