Citation: WEI Shao-qing, TENG Yang, LI Xiao-hang, SU Yin-jiao, YANG Wei, ZHANG Kai. Comparison of mercury emission from around 300 MW coal-fired power generation units between pulverized boiler and circulating fluidized-bed boiler[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(8): 1009-1016. shu

Comparison of mercury emission from around 300 MW coal-fired power generation units between pulverized boiler and circulating fluidized-bed boiler

WEI Shao-qing ^1,2 ,
TENG Yang ^2,3 ,
LI Xiao-hang ³ ,
SU Yin-jiao ³ ,
YANG Wei ^2,4 ,
ZHANG Kai ^2,3,,

1.
Jinneng Electric Power Group Co., Ltd., Taiyuan 030002, China
2.
Shanxi Province Engineering Research Center of Clean Coal Combustion for Power Generation (Under Preparation), Taiyuan 030006, China
3.
Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China
4.
Jinneng Group Changzhi Thermoelectricity Co., Ltd., Changzhi 046011, China

Corresponding author: ZHANG Kai, kzhang@ncepu.edu.cn
Received Date: 24 January 2017
Revised Date: 27 June 2017

Fund Project: the Major Special Project of Shanxi Province MD2015-01the National Natural Science Foundation of China U1610254The project was supported by the National Natural Science Foundation of China(U1610254), the Major Special Project of Shanxi Province (MD2015-01) and the Fundamental Research Funds for the Central Universities(2017MS020)the Fundamental Research Funds for the Central Universities 2017MS020

Figures(5)

The mercury emission characteristics are investigated and compared at a coal-fired power plant with 330 MW pulverized coal (PC) boiler and a coal-fired power plant with 350 MW circulating fluidized bed (CFB) boiler. EPA 30B method and Ontario method were used to test the mercury concentration in flue gas at the inlet of dust extraction unit, outlet of dust extraction unit, outlet of desulfurization unit, and outlet of wet dust extraction unit. The feed coal, bottom ash, fly ash and gypsum sample were collected at the same time together with gas sampling. The effect of the existing air pollution control device on mercury control was discussed toward PC and CFB units based on the mercury distribution data. The results show that the mercury concentration at fabric filter (FF) outlet of CFB power plant is decreased to 0.43 μg/m³ and the mercury removal efficiency of FF reaches 98.9%. A predominating portion of mercury is enriched in fly ash. With respect to a PC power plant, the mercury concentrations at inlet and outlet of ESP are both higher than those in the CFB power plant, and the mercury concentration gradually drops from electrostatic precipitator (ESP) inlet to wet flue gas desulfurization (WFGD) outlet. The mercury concentration reaches a low value of 0.42 μg/m³ at the WFGD outlet, and the mercury removal efficiency of ESP and WFGD is 75.0% and 22.4%, respectively, which can meet the ultra low mercury emission controlling.
- coal-fired power plant,
- mercury emission,
- mercury pollution monitor,
- pulverized coal boiler,
- circulating fluidized bed
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