Deep Peak Shaving Technology for 330 MW Circulating Fluidized Bed Boiler
ZHANG Sihai,
LI Chaoran,
WAN Guangliang,
LIU Yinxue,
XU Hainan,
HUANG Zhong,
YANG Hairui
Affiliations
ZHANG Sihai
Guoneng Ningdong No.1 Power Generation Co., Ltd., Yinchuan 750408, Ningxia Hui Autonomous Region, China
LI Chaoran
State Key Lab of Control and Simulation of Power Systems and Generation Equipments (Department of Energy and Power Engineering, Tsinghua University), Haidian District, Beijing 100084, China
WAN Guangliang
Guoneng Ningdong No.1 Power Generation Co., Ltd., Yinchuan 750408, Ningxia Hui Autonomous Region, China
LIU Yinxue
Guoneng Ningdong No.1 Power Generation Co., Ltd., Yinchuan 750408, Ningxia Hui Autonomous Region, China
XU Hainan
Guoneng Ningdong No.1 Power Generation Co., Ltd., Yinchuan 750408, Ningxia Hui Autonomous Region, China
HUANG Zhong
State Key Lab of Control and Simulation of Power Systems and Generation Equipments (Department of Energy and Power Engineering, Tsinghua University), Haidian District, Beijing 100084, China
YANG Hairui
State Key Lab of Control and Simulation of Power Systems and Generation Equipments (Department of Energy and Power Engineering, Tsinghua University), Haidian District, Beijing 100084, China
To promote the implementation of the “double carbon” policy and to manage the high volatility of new energy, the current requirements for deep peak shaving of thermal power units are getting higher and higher. Circulating fluidized bed (CFB) boiler units have inherent advantages under low load operation conditions. However, the ultra-low load operation below 20% still faces many difficulties, such as the stability of the fluidization in the furnace, the emission of nitrogen oxides, and the safety issues caused by local over-temperature in the furnace. This paper took the application of deep peaking technology of a 330 MW CFB boiler as an example and introduced the modification of the unit components, such as the coal conveying screening and crushing system, throttling rings of wind caps and lower secondary air pipes, etc. With the application of flue gas recirculation and other technologies, an 18% ultra-low load operation was successfully realized on this CFB boiler, and the NOx emission was also well controlled. The key points and difficulties of the ultra-low load operating technology of CFB unit were summarized. The potential problems caused by deep peaking operation were analyzed, and corresponding measures were proposed. The results of this study have an important engineering reference value.
