Inexpensive calcium-modified potassium carbonate sorbent for CO2 capture from flue gas: Improved SO2 resistance, enhanced capacity and stability

Abstract Many sorbents have been studied for their CO2 sorption capacities with CO2 and N2 mixture. In reality, flue gases contain SO2. This research was designed to develop and evaluates an inexpensive and robust CO2 sorbent for actual flue gas. Ca(OH)2, CaO and CaCO3 were explored to serve as additives of K2CO3/γ-Al2O3 for CO2 capture. The three additives were characterized using different methods including thermal gravimetric, X-ray diffraction analyses and so on. It was found that Ca(OH)2 is the best additive of K2CO3/γ-Al2O3 for CO2 capture. The performances of K2CO3/Ca(OH)2/γ-Al2O3 were evaluated with a fluidized bed reactor under different conditions including the presence of SO2. Experimental results show that introduction of Ca(OH)2 made K2CO3/Ca(OH)2/γ-Al2O3 not only more capable in adsorbing CO2 but also more robust within SO2-containing flue gas. Thus the research work provides useful information for further development and subsequent commercialization of K2CO3/Ca(OH)2/γ-Al2O3 in coal-fired power plants.

[1]  A. Steinfeld,et al.  Kinetic analysis of the carbonation reactions for the capture of CO2 from air via the Ca(OH)2–CaCO3–CaO solar thermochemical cycle , 2007 .

[2]  S. Long,et al.  Growth in elevated CO(2) can both increase and decrease photochemistry and photoinhibition of photosynthesis in a predictable manner. Dactylis glomerata grown in two levels of nitrogen nutrition. , 2001, Plant physiology.

[3]  S. H. Kim,et al.  Sodium-based dry regenerable sorbent for carbon dioxide capture from power plant flue gas , 2008 .

[4]  Chungsying Lu,et al.  Thermodynamics and regeneration studies of CO2 adsorption on multiwalled carbon nanotubes , 2010 .

[5]  May-Britt Hägg,et al.  Techno-economic evaluation of a PVAm CO2-selective membrane in an IGCC power plant with CO2 capture , 2008 .

[6]  Douglas P. Harrison,et al.  Carbon Dioxide Capture Using Dry Sodium-Based Sorbents , 2004 .

[7]  Heleen Groenenberg,et al.  Progress on including CCS projects in the CDM: Insights on increased awareness, market potential and baseline methodologies , 2009 .

[8]  S. Bandyopadhyay,et al.  Absorption of carbon dioxide into aqueous blends of 2-amino-2-methyl-1-propanol and diethanolamine , 2003 .

[9]  Changsui Zhao,et al.  K2CO3/Al2O3 for Capturing CO2 in Flue Gas from Power Plants. Part 2: Regeneration Behaviors of K2CO3/Al2O3 , 2012 .

[10]  J. Sun.  The decrease of CO2 emission intensity is decarbonization at national and global levels , 2005 .

[11]  Xiaoping Chen,et al.  Effects of SO2/NO on CO2 Capture Characteristics of K2CO3/Al2O3 in a Bubbling Fluidized-Bed Reactor , 2013 .

[12]  E. Barrett,et al.  (CONTRIBUTION FROM THE MULTIPLE FELLOWSHIP OF BAUGH AND SONS COMPANY, MELLOX INSTITUTE) The Determination of Pore Volume and Area Distributions in Porous Substances. I. Computations from Nitrogen Isotherms , 1951 .

[13]  Robert H. Borgwardt,et al.  Kinetics of the reaction of sulfur dioxide with calcined limestone , 1970 .

[14]  A. Russell,et al.  Dynamic separation of ultradilute CO2 with a nanoporous amine-based sorbent , 2012 .

[15]  Maohong Fan,et al.  Use of Nanoporous FeOOH as a Catalytic Support for NaHCO3 Decomposition Aimed at Reduction of Energy Requirement of Na2CO3/NaHCO3 Based CO2 Separation Technology , 2011 .

[16]  R. L. Pigford,et al.  Rate of Diffusion-Controlled Reaction Between a Gas and a Porous Solid Sphere - Reaction of SO2 with CaCO3 , 1973 .

[17]  Yuri I. Aristov,et al.  Sorption of CO2 from Humid Gases on Potassium Carbonate Supported by Porous Matrix , 2001 .

[18]  Changsui Zhao,et al.  K2CO3/Al2O3 for Capturing CO2 in Flue Gas from Power Plants. Part 3: CO2 Capture Behaviors of K2CO3/Al2O3 in a Bubbling Fluidized-Bed Reactor , 2012 .

[19]  B. Metz,et al.  Global learning on carbon capture and storage: A call for strong international cooperation on CCS demonstration , 2009 .

[20]  Jyh-Ping Lin,et al.  Kinetics of the Reaction of Ca(OH)2 with CO2 at Low Temperature , 1999 .

[21]  Chong Kul Ryu,et al.  CO2 absorption and regeneration of alkali metal-based solid sorbents , 2006 .

[22]  M. Fan,et al.  CO2 Separation by a New Solid K−Fe Sorbent , 2011 .

[23]  Haruhiko Tanaka,et al.  Kinetics and mechanism of the thermal dehydration of calcium oxalate monohydrate , 1981 .