Direct sulfation of limestone based on oxy-fuel combustion technology

Abstract With limestone as the sorbent, the sulfation reaction can proceed via two different routes depending on whether calcination of the limestone takes place under the given reaction conditions. The direct sulfation reaction is defined as the sulfation reaction between sulfur dioxide (SO2) and limestone in an uncalcined state. This reaction, based on oxyfuel combustion technology, was studied by thermogravimetric analysis. Surface morphologies of the limestone particles after sulfation were examined by a scanning electron microscope. Results show that there are more pores or gaps in the product layer formed by direct sulfation of limestone than by indirect sulfation, which can be attributed to the generation of carbon dioxide (CO2) at a reaction interface. Compared with indirect sulfation, direct sulfation of limestone can yield much higher conversion and has a much higher reaction rate. For direct sulfation, the greater porosity in the product layer greatly reduces the solid-state ion diffusion dista...

[1]  Chunbo Wang,et al.  Investigation on sulfation of modified Ca-based sorbent , 2002 .

[2]  Liang-Shih Fan,et al.  Diffusion through CaSO4 formed during the reaction of CaO with SO2 and O2 , 1993 .

[3]  L. Fan,et al.  Dispersion and ultra-fast reaction of calcium-based sorbent powders for SO2 and air toxics removal in coal combustion☆ , 1999 .

[4]  Ken Okazaki,et al.  Drastic SOx Removal and Influences of Various Factors in O2/CO2 Pulverized Coal Combustion System , 2001 .

[5]  T. Edgar,et al.  Distributed pore‐size model for sulfation of limestone , 1983 .

[6]  K. Okazaki,et al.  Simultaneous easy CO2 recovery and drastic reduction of SOx and NOx in O2/CO2 coal combustion with heat recirculation☆ , 2003 .

[7]  Antonio B. Fuertes,et al.  Study of the direct sulfation of limestone particles at high CO2 partial pressures , 1994 .

[8]  Kim Dam-Johansen,et al.  Direct sulfation of limestone , 2007 .

[9]  J. Grace,et al.  Crystallization and Fracture: Product Layer Diffusion in Sulfation of Calcined Limestone , 2004 .

[10]  Edward J. Anthony,et al.  Experimental Study of Oxy-Fuel Combustion and Sulfur Capture in a Mini-CFBC , 2007 .

[11]  Ken Okazaki,et al.  Sulfation behavior of limestone under high CO2 concentration in O2/CO2 coal combustion , 2000 .

[12]  J. González,et al.  High pressure thermogravimetric analysis of the direct sulfation of Spanish calcium-based sorbents. , 1999 .

[13]  S. Krishnan,et al.  Sulfation of high purity limestones under simulated pfbc conditions , 1993 .

[14]  Adel F. Sarofim,et al.  Analysis and modeling of the direct sulfation of CaCO3 , 1988 .

[15]  Circulating fluidized bed boilers , 1981 .

[16]  C. Tullin,et al.  Direct sulfation of calcium carbonate: the influence of carbon dioxide partial pressure , 1993 .

[17]  A. B. Fuertes,et al.  Analysis of the direct sulfation of calcium carbonate , 1994 .

[18]  Adel F. Sarofim,et al.  DIRECT SULFATION OF CALCIUM CARBONATE , 1988 .

[19]  Kim Dam-Johansen,et al.  REVIEW OF THE DIRECT SULFATION REACTION OF LIMESTONE , 2006 .

[20]  Ron Zevenhoven,et al.  Sulfur dioxide capture under PFBC conditions: the influence of sorbent particle structure , 1998 .

[21]  J. Grace,et al.  Crystallization and fracture: formation of product layers in sulfation of calcined limestone , 2000 .

[22]  M. Rahmani,et al.  Direct sulfation of calcium carbonate using the variable diffusivity approach , 2006 .

[23]  Qin Zhong,et al.  Direct sulfation reaction of SO2 with calcium carbonate , 1995 .

[24]  G. Simons,et al.  Small pore closure and the deactivation of the limestone sulfation reaction , 1986 .

[25]  A. B. Fuertes,et al.  Sulfation of dolomite particles at high CO2 partial pressures , 1995 .