Comparison of Characteristics of SCR-DeNOx Catalyst for Gas-Turbine Units and Coal-Fired Units

doi:10.11930/j.issn.1004-9649.202011126

Abstract

Abstract: Based on the comparison between gas-turbine units and coal-fired units in terms of the NO_x emission policy requirements and the characteristics of catalysts in SCR process, this paper expounds the importance of SCR-DeNO_x application in gas turbine units and analyses the difference in the features of SCR-DeNO_x catalyst, such as layout, structure, composition and DeNO_x efficiency. The study results show that due to the low flue gas temperature, high baseline oxygen content, low NO_x, SO₂ and dust contents in the inlet flue gas, the catalysts are generally arranged in the waste heat boiler after the medium pressure evaporator in the gas turbine units with the designed DeNO_x efficiency between 30% and 70%, suitable for the implementation of loose ammonia escape control strategies. Their pore quantities per unit are generally higher than 40×40 and shorter than 350 mm. The contents of active components (V₂O₅) and promoter components (WO₃) are significantly higher than that of coal-fired flue gas DeNO_x catalysts. Moreover, due to the slow decay rate of chemical deactivation and mechanical damage of the catalysts in gas turbine SCR process, a longer service life is expected for the catalysts. At last, the detection methods for the catalyst of gas turbine SCR process shall be different from the traditional methods for the catalyst in coal-fired unit SCR process under current standards.

Key words: gas turbine unit, coal-fired unit, NO_x, SCR-DeNO_x, catalyst, honeycomb type

LIU Zhitan, YAO Jie, ZHUANG Ke, YU Lemeng, ZHOU Kai. Comparison of Characteristics of SCR-DeNO_x Catalyst for Gas-Turbine Units and Coal-Fired Units[J]. Electric Power, 2021, 54(6): 145-152.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202011126

https://www.electricpower.com.cn/EN/Y2021/V54/I6/145

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Comparison of Characteristics of SCR-DeNO_x Catalyst for Gas-Turbine Units and Coal-Fired Units

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