Absorption of CO2 from Flue Gas by K2CO3and Na2CO3 supported on Activated Carbon: Effect of SO2
Date Issued
2007
Date
2007
Author(s)
Yong, Wen-Yu
DOI
zh-TW
Abstract
A differential fixed-bed reactor was employed to study the effect of SO2 on the absorption of CO2 from flue gas by K2CO3 and Na2CO3 supported on activated carbon under low temperature and humid conditions. With the presence of water vapor, CO2 and SO2 reacted with K2CO3 to form KHCO3 and KHSO3, and with Na2CO3 to form NaHCO3 and Na2SO3, respectively. As the SO2 concentration decreased, the extents of sulfation of sorbent, decreased and the extents of carbonation increased; the extent of carbonation of K2CO3-IAC was the same as that without the presence of SO2 , when the SO2 concentration was less than 500ppm, but the extent of carbonation of Na2CO3-IAC was still affected by the presence of SO2 when SO2 concentration was 200ppm. The reaction of sorbents was affected markedly by relative humidity and less pronouncedly by CO2 concentration. Under the same reaction conditions, K2CO3-IAC had higher extent of carbonation than Na2CO3-IAC. Thus, K2CO3-IAC is more suitable to be used as a sorbent to absorb CO2 from the flue gas. At 60℃, 70%RH, 12%CO2, and 200-500ppm SO2, the extent of carbonation of K2CO3-IAC was 83%.
Subjects
碳酸鉀
碳酸鈉
二氧化碳
二氧化硫
吸收
煙道氣
K2CO3
Na2CO3
CO2
SO2
Type
thesis
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