Theoretical Model for SO3 Removal from Flue Gas Using Alkali Sorbent Injection Technology in Power Plant

doi:10.11930/j.issn.1004-9649.201704102

Abstract

Abstract: Alkaline sorbent injection is a new technology to remove SO₃ from flue gas in power plant. In this paper, the technical features, system operation characteristics and principles of SO₃ removal using alkaline absorbent are introduced. Meanwhile, the theoretical model of SO₃ removal reaction is established and verified through practice. Moreover, the impact of alkaline sorbent on the activity of catalyst is examined. The results show that the terminal settling velocity of absorbent is 0.01~0.1m/s, which is far less than that of flue gas. By simplifying the gas-solid reaction model, the deviation of theoretical SO₃ removal efficiency from engineering measurement value is less than ±5%, and the SO₃ removal efficiency is related to the flue gas velocity, flue gas temperature, particle size, chemical equivalence ratio and so on. In the process of engineering design, in order to ensure the SO₃ removal efficiency above 80%, the stoichiometric ratio must be set higher than 1.5, and the particle size of absorbent must be smaller than 30 μm, while the retention time of absorbent particles should not be less than 4s. The side effects of sorbent sodium sulfite on denitration catalysts is negligible.

Key words: coal-fired power plant, flue gas, SO₃, sulphur acid, alkali sorbent, Na₂SO₃

CLC Number:

TM621
X51

YAO Xuan, YANG Jianhui, WANG Hongliang, DUAN Wei, SONG Peng, ZHANG Jun, LU Guangjie, ZHENG Peng. Theoretical Model for SO₃ Removal from Flue Gas Using Alkali Sorbent Injection Technology in Power Plant[J]. Electric Power, 2018, 51(4): 130-135.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201704102

https://www.electricpower.com.cn/EN/Y2018/V51/I4/130

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Theoretical Model for SO₃ Removal from Flue Gas Using Alkali Sorbent Injection Technology in Power Plant

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