Absorption of CO2 from Flue Gas by Na2CO3 and K2CO3 Supported on Activated Carbon
Date Issued
2006
Date
2006
Author(s)
Tsai, Chi-Fan
DOI
zh-TW
Abstract
A differential fixed-bed reactor was employed to study the removal of CO2 from flue gas using K2CO3 and Na2CO3 supported on activated carbon under low temperature (60℃) and humid (50-90%RH) conditions. CO2 concentrations ranging from 0 to 50% and SO2 from 0 to 1000ppm were used.
With the presence of CO2 and SO2, K2CO3 was converted to KHCO3 and KHSO3, and Na2CO3 to NaHCO3 and Na2SO3. When the sorbents reacted with CO2 alone, the increase in CO2 concentration had almost no effect on the conversion of K2CO3, but increased the conversion of Na2CO3. When SO2 was added, CO2 captures for both sorbents were decreased at the SO2 concentration of 1000ppm, but increased at 500ppm; the reaction of sorbents also reached the ultimate conversions more quickly than the CO2 alone case. The ultimate conversion of sorbents increased, as the relative humidity increased. Under the same reaction conditions, the extent of carbonation of K2CO3 was higher than that of Na2CO3, but the extent of sulfation of K2CO3 was lower than that of Na2CO3. The CO2 capture capacity of K2CO3 or Na2CO3 would not be reduced by the presence of SO2 in flue gas provided that the SO2 concentration is below 500ppm.
Subjects
活性碳
碳酸鉀
碳酸鈉
二氧化碳
二氧化硫
吸收
碳酸化
煙道氣
activated carbon
K2CO3
Na2CO3
carbon dioxide
sulfur dioxide
absorption
carbonation
flue gas
Type
thesis
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