Analysis of the Ultra-low Emission Transformation and CEMS Acceptance of Coal-fired Power Plant in Anhui Province

doi:10.11930/j.issn.1004-9649.201801151

Abstract

Abstract: The transformation of ultra-low emissions of 67 coal-fired generating units (36 490 MW) has completed in Anhui Province. On this basis, the technical routes of ultra-low emissions of SO₂, NO_x and dust, the economics of the retrofit, the emissions concentrations and emission reductions after retrofit, as well as the problems in the CEMS acceptance of the three types of pollutants were analyzed. The research shows that the ultra-low transformation of coal-fired power plants in Anhui Province mainly follows three typical technical approaches, which are wet electrostatic precipitator, low-temperature electrostatic precipitator and super net electric bag. The 1 000 MW units have the highest economical efficiency, followed by the 600 MW units and 300 MW units. The ultra-low transformation has a remarkable effect on the emissions reduction of the flue gas pollutants in the power plants of the province, and the synergistic removal of the pollutants is effective. However, the current gaseous pollutant monitoring instruments, dust filter materials and testing methods cannot meet the test accuracy requirements of the modified CEMS after transformation. Therefore it is suggested that the low-concentration dust measurement automatic sampling system and blank experiment correction be used for the ultra-low transformation units. In addition, it is recommended to use ultraviolet or infrared smoke analyzer for SO₂ acceptance, and high temperature heating for the sampling pipeline respectively. NO_x acceptance should be based on both the test data of the SCR denitrification outlet and the total discharge NO_x concentration test.

Key words: coal-fired units, ultra-low emission, modification route, flue gas pollutants, continuous emission monitoring system, acceptance and evaluation

CLC Number:

X773

HE Jun, MA Dawei, WANG Zhengfeng, XU Yongyi, ZHA Zhiming, ZHANG Qiliang. Analysis of the Ultra-low Emission Transformation and CEMS Acceptance of Coal-fired Power Plant in Anhui Province[J]. Electric Power, 2018, 51(7): 170-177.

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https://www.electricpower.com.cn/EN/Y2018/V51/I7/170

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