The Characteristics of Limestone Dissolution under Oxy-firing Combustion Surroundings

doi:10.11930/j.issn.1004-9649.201608011

Electric Power ›› 2018, Vol. 51 ›› Issue (3): 155-162.DOI: 10.11930/j.issn.1004-9649.201608011

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The Characteristics of Limestone Dissolution under Oxy-firing Combustion Surroundings

SHI Xiaohong^1,2, LIU Yi¹, ZHONG Zhaoping³, ZHANG Kai⁴, ZHAO Kai³

1. ShenhuaGuohua (Beijing) Electric Power Research Institute Co., Ltd., Beijing 100025, China;
2. Sanhe Power Generation Co., Ltd., Sanhe 065201, China;
3. Southeast University, Nanjing 210096, China;
4. Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China

Received:2016-08-03 Revised:2017-01-06 Online:2018-03-05 Published:2018-03-12
Supported by:
This work is supported by Shenhua Group Science and Technology Innovation Grant Project (No.[2011]368), International Scientific and Technological Cooperation Fund Program (No.2012DFB60100), National Key Technology Support Program (No.2015BAA05B02).

Abstract

Abstract: Under the oxy-firing combustion surroundings, the characteristics of limestone dissolution used for WFGD were researched on a small-scale test rig. The results indicate that higher CO₂ concentration can enhance the dissolution of limestone. Especially at 80% CO₂ concentration the rate of limestone dissolution increases significantly. The higher CO₂ concentration, the faster rate of dissolution under the same pH value. When pH is equal to 4.5, it takes 70 more minutes under low CO₂ concentration surroundings than with the high CO₂ concentration surroundings. Apparently, the CO₂ concentration has significant impact on the limestone dissolution.

Key words: coal-fired power generation, oxy-firing combustion surroundings, limestone, wet desulphurization (WFGD), dissolution, ?CO₂ concentration

CLC Number:

TM621

SHI Xiaohong, LIU Yi, ZHONG Zhaoping, ZHANG Kai, ZHAO Kai. The Characteristics of Limestone Dissolution under Oxy-firing Combustion Surroundings[J]. Electric Power, 2018, 51(3): 155-162.

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The Characteristics of Limestone Dissolution under Oxy-firing Combustion Surroundings

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