Effect of bed height on the carbon dioxide capture by carbonation/regeneration cyclic operations using dry potassium-based sorbents

Abstract

The effect of bed height on CO 2 capture was investigated by carbonation/regeneration cyclic operations using a bubbling fluidized bed reactor. We used a potassium-based solid sorbent, SorbKX35T5 which was manufactured by the Korea Electric Power Research Institute. The sorbent consists of 35% K 2 CO 3 for absorption and 65% supporters for mechanical strength. We used a fluidized bed reactor with an inner diameter of 0.05 m and a height of 0.8 m which was made of quartz and placed inside of a furnace. The operating temperatures were fixed at 70 o C and 150 o C for carbonation and regeneration, respectively. The carbonation/regeneration cyclic operations were performed three times at four different L/D (length vs diameter) ratios such as one, two, three, and four. The amount of CO 2 captured was the most when L/D ratio was one, while the period of maintaining 100% CO 2 removal was the longest as 6 minutes when L/D ratio was three. At each cycle, CO 2 sorption capacity (g CO 2 /g sorbent) was decreased as L/D ratio was increased. The results obtained in this study can be applied to design and operate a large scale CO 2 capture process composed of two fluidized bed reactors.

Carbon Dioxide Capture from Flue Gas Using a Potassium-Based Sorbent in a Circulating-Turbulent Fluidized Bed

“…However, the carbonation reaction rate of Na2CO3 was rather slow [16]. The attrition resistance (AI) and the corrected attrition index (CAI) of K2CO3 were higher than those of Na2CO3 sorbent [5,9,17]. For solid sorbent regeneration, the alkali metal required low regeneration temperature comparing with the alkali earth metal.…”

Performance of a silica-polyethyleneimine adsorbent for post-combustion CO2 capture on a 100 kg scale in a fluidized bed continuous unit

“…KIER has developed a dry CO2 capture process using solid sorbents [37][38][39][40][41][42][43][44], and the research results on CO2 capture have been steadily reported in a laboratory-scale, a bench-scale, a pilot-scale process [1,2,[4][5][6]45,46]. Recently, Kim et al evaluated the CO2 capture performance of silica-PEI adsorbent in a lab.-scale TBS (twin bubbling fluidized-bed system) where 24 h preliminary tests were performed using 5 kg of adsorbent where the PEI with a molecular mass of 800.…”

Continuous testing of silica-PEI adsorbents in a lab.-scale twin bubbling fluidized-bed system

“…KIER has developed dry CO 2 capture technology using solid sorbents, and related research is being conducted. The research results on CO 2 capture in a laboratory-scale device have been steadily reported, and a pilot-scale CO 2 capture process using dry adsorbents has been developed, consisting of a fluidized-bed-type adsorption reactor and a regeneration reactor (Yi et al, 2007(Yi et al, , 2008Yi, 2009Yi, , 2010Park et al, 2009aPark et al, ,b, 2011Kim et al, 2010Kim et al, , 2011. At present, the authors are continuing their research using dry adsorbents, and are developing more economical and energy-efficient dry adsorbents and the CO 2 capture process for commercial scale of 10 MWe (Park et al, 2013(Park et al, , 2014a(Park et al, ,b, 2016Kim et al, 2017).…”