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Influence of flue gas recirculation on operation characteristics of large scale CFB boiler under low load
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Zemin YUAN1, 2, Xiwei KE1, Zhong HUANG1, Yunkai YANG3, Guangjian WU3, Qing LIU1, Suxia MA2, Liang CHENG4, Zhenning ZHAO4
Thermal Power Generation | 2023, 52(9) : 58 - 64
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Thermal Power Generation | 2023, 52(9): 58-64
• Clean, efficient and flexible coal-fired power technology •
Influence of flue gas recirculation on operation characteristics of large scale CFB boiler under low load
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Zemin YUAN1, 2, Xiwei KE1, Zhong HUANG1, Yunkai YANG3, Guangjian WU3, Qing LIU1, Suxia MA2, Liang CHENG4, Zhenning ZHAO4
Affiliations
  • 1.Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
  • 2.College of Electric and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • 3.Jinneng Datuhe Power Plant Co., Ltd., Lvliang 033000, China
  • 4.State Grid Jibei Electric Power Research Institute, Beijing 100054, China
Published: 2023-09-25 doi: 10.19666/j.rlfd.202305097
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Flue gas recirculation (FGR) is an important technical mean to improve the safety of circulating fluidized bed (CFB) boiler and reduce the generation of NOx under low-load operation. In the present work, the relationships between temperature distribution of the boiler, NOx, CO mass concentration and O2 volume fraction of the flue gas at furnace outlet, the combustible matter content of fly ash and bottom slag and the flow rate of FGR under the load of 20%, 30% and 40% BMCR (boiler maximum continuous rating) were studied using one-dimensional chamber CFB combustion quasi-static model at a supercritical 350 MW CFB boiler. The results show that both the bed temperature and furnace exit flue gas temperature decrease with the increase of FGR flow rate, which the former decreases less than the latter. The temperature difference between the upper and lower furnace gradually decreases with the increase of FGR flow rate, which is more significantly affected by FGR flow rate at lower loads. The NOx mass concentration of flue gas at the furnace exit shows a trend of decreasing first and then increasing with the increase of FGR flow rate, and the existence of the optimal FGR flow rate can make the unit operation economically and environmentally friendly. In addition, with the increase of the FGR flow rate, the CO mass concentration at the furnace outlet, combustible matter content of fly ash and bottom slag shows an increasing trend. The FGR significantly reduces the primary air oxygen volume fraction while ensuring that the fluidized air flow rate in the dense phase area is always higher than the protection value, which ensures the operation safety of the boiler under low load furtherly.

CFB boiler  /  low load  /  FGR  /  one-dimensional chamber CFB combustion model  /  boiler operation characteristic
Zemin YUAN, Xiwei KE, Zhong HUANG, Yunkai YANG, Guangjian WU, Qing LIU, Suxia MA, Liang CHENG, Zhenning ZHAO. Influence of flue gas recirculation on operation characteristics of large scale CFB boiler under low load[J]. Thermal Power Generation, 2023 , 52 (9) : 58 -64 . DOI: 10.19666/j.rlfd.202305097
Funding
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  • National Key Research and Development Program(2022YFB4100301)
  • Science and Technology Funding Project of State Grid Jibei Electric Power(SGTYHT/21-HS-225)
Appendix
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Year 2023 volume 52 Issue 9
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56
8
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Article Info
doi: 10.19666/j.rlfd.202305097
  • Receive Date：2023-05-04
  • Online Date：2026-01-26
  • Published：2023-09-25
Article Data
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History
  • Received：2023-05-04
Funding
National Key Research and Development Program(2022YFB4100301)
Science and Technology Funding Project of State Grid Jibei Electric Power(SGTYHT/21-HS-225)
Affiliations
    1.Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
    2.College of Electric and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    3.Jinneng Datuhe Power Plant Co., Ltd., Lvliang 033000, China
    4.State Grid Jibei Electric Power Research Institute, Beijing 100054, China
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https://castjournals.cast.org.cn/joweb/rlfd/EN/10.19666/j.rlfd.202305097
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红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
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光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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