Application of SO3 Removal with Alkaline Sorbent Injection in Large Capacity Coal-Fired Power Plants

doi:10.11930/j.issn.1004-9649.2017.07.102.07

Abstract

Abstract: In order to solve the problems of air heater fouling, duct corrosion, ammonium bisulfate adhering to ESP and plume opacity to meet the strict SO₃ emission standards in the future, the SO₃ removal technology with alkaline sorbent is studied in this paper. The technical characteristics of the dry sorbent injection are compared with those of the slurry injection. In addition, the applicable scope of different alkaline sorbents is studied, and the reserves and prices of the mineral resources in China are also investigated. Then the technical and economic characteristics of the sorbent injection system are analyzed on a 600 MW coal-fired unit that fires the coal with 1% sulfur content. The results show that the technology of alkaline sorbent injection is an effective way to solve SO₃ pollution and related issues. All sorbents injected in suitable positions can meet the requirements of SO₃ removal efficiency. The injecting location and the economy are vital for determining the technical route. The operation cost of the slurry injection system is about 2.9 times of that of the dry sorbent injection system in China. The dry sorbents such as Ca(OH)₂ and MgO are recommended, Ca(OH)₂ is better to be injected at the inlet or outlet of the air heater and MgO to be injected at the SCR inlet or outlet.

Key words: coal-fired flue gas, SO₃, dry sorbent injection, slurry injection, air heater

CLC Number:

TM621

GAO Zhipu, HU Dong, ZHANG Zhigang, GUO Tingting, WANG Haigang, CHEN Kunyang. Application of SO₃ Removal with Alkaline Sorbent Injection in Large Capacity Coal-Fired Power Plants[J]. Electric Power, 2017, 50(7): 102-108.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2017.07.102.07

https://www.electricpower.com.cn/EN/Y2017/V50/I7/102

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Application of SO₃ Removal with Alkaline Sorbent Injection in Large Capacity Coal-Fired Power Plants

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