Experimental Study on Carbon Removal by Aqueous Ammonia under Oxy-enrich Combustion

doi:10.11930/j.issn.1004-9649.2014.7.156.4

Abstract

Abstract: Experimental studies on carbon removal by aqueous ammonia under oxy-enrich combustion flue gas(30%~40% v/v CO₂) in a packed column were carried out. Effects of different operating and design parameters on CO₂ removal efficiency, including concentration of CO₂ in flue gas, concentration of aqueous ammonia, pH value of absorbent, aqueous ammonia flow rate, flue gas temperature, total flue gas flow rate and packing height, were investigated. The research results show that: ① improving concentration of aqueous ammonia, improving pH value of absorbent and increasing flow rate of aqueous ammonia can increase removal efficiency of CO₂ respectively; but when pH value is 10.5, a certain volatility of removal efficiency occurs; ② when gas temperature is 50 ℃, the removal efficiency is the highest; ③ when concentration of aqueous ammonia is greater than 4%, the removal efficiency is above 90%. Under oxy-enrich combustion 1 kg NH₃ can absorb 0.32 kg CO₂, which is twice greater than conventional combustion. Therefore using oxy-enrich combustion mode contributes to reducing the volume of the absorber and regeneration column, as well as energy consumption.

Key words: oxy-enrich combustion, carbon removal, CO2 absorbent, aqueous ammonia

CLC Number:

TK09

CUI Cai-yan, WANG Chun-bo, BAI Yan-fei, ZHOU Xing, LIU Hui-min. Experimental Study on Carbon Removal by Aqueous Ammonia under Oxy-enrich Combustion[J]. Electric Power, 2014, 47(7): 156-160.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.7.156.4

https://www.electricpower.com.cn/EN/Y2014/V47/I7/156

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