Sulphur capture in fluidized bed boilers: The effect of reductive decomposition of CaSO4

Studies of in-situ calcium based sorbents in advanced pressurized coal conversion systems. Final report, June 1991--October 1994

“…These studies indicate that 0, starvation at the hot spots (created by the highly exothermic reaction) is a significant factor in causing the evolution of SO,. SO, emission was also reported by Lyngfelt (1989). He states that Cas and CaSO, are stable under reducing and oxidizing conditions, respectively while CaO is stable at intermediate conditions.…”

Studies of in-situ calcium based sorbents in advanced pressurized coal conversion systems. Final report, June 1991--October 1994

“…These studies indicate that 0, starvation at the hot spots (created by the highly exothermic reaction) is a significant factor in causing the evolution of SO,. SO, emission was also reported by Lyngfelt (1989). He states that Cas and CaSO, are stable under reducing and oxidizing conditions, respectively while CaO is stable at intermediate conditions.…”

Multicycle Study on Chemical-Looping Combustion of Simulated Coal Gas with a CaSO4 Oxygen Carrier in a Fluidized Bed Reactor

“…The investigation of sulfur capture provides reference to the application of a CaSO 4 oxygen carrier in CLC. However, the cycle of CaSO 4 /CaS is different from the previous extensive investigations on the reduction decomposition of CaSO 4 in FBC systems performed by the Chalmers University of Technology in Sweden. − As demonstrated in the literature by Anthony and Granatstein, CaSO 4 is a thermodynamically stable product at typical FBC temperatures (800−950 °C) and overall oxidizing conditions. According to the extensive studies by Mattisson and Lyngfelt, CaSO 4 is the stable compound at highly oxidizing conditions, CaS is the stable product at strongly reducing conditions and in the presence of SO 2 , while CaO is favored thermodynamically in intermediate conditions .…”

Reduction of phosphogypsum for SO 2 production: Insights into the release characteristics of SO 2 following the solid–solid reaction of CaS and CaSO

“…The phase diagrams indicate the reactions from a non‐standard to the equilibrium state. According to the principles reported in previous studies, [ 8–12 ] phase diagrams of CaSO 4 reduction under CO, CH 4 , and S atmospheres were obtained (Figure 3). The predominant areas of CaSO 4 , CaS, and CaO species at a constant temperature were obtained.…”

Studies of in-situ calcium based sorbents in advanced pressurized coal conversion systems. Final report, June 1991--October 1994

“…These studies indicate that 0, starvation at the hot spots (created by the highly exothermic reaction) is a significant factor in causing the evolution of SO,. SO, emission was also reported by Lyngfelt (1989). He states that Cas and CaSO, are stable under reducing and oxidizing conditions, respectively while CaO is stable at intermediate conditions.…”

Multicycle Study on Chemical-Looping Combustion of Simulated Coal Gas with a CaSO4 Oxygen Carrier in a Fluidized Bed Reactor

“…The investigation of sulfur capture provides reference to the application of a CaSO 4 oxygen carrier in CLC. However, the cycle of CaSO 4 /CaS is different from the previous extensive investigations on the reduction decomposition of CaSO 4 in FBC systems performed by the Chalmers University of Technology in Sweden. − As demonstrated in the literature by Anthony and Granatstein, CaSO 4 is a thermodynamically stable product at typical FBC temperatures (800−950 °C) and overall oxidizing conditions. According to the extensive studies by Mattisson and Lyngfelt, CaSO 4 is the stable compound at highly oxidizing conditions, CaS is the stable product at strongly reducing conditions and in the presence of SO 2 , while CaO is favored thermodynamically in intermediate conditions .…”

Reduction of phosphogypsum for SO 2 production: Insights into the release characteristics of SO 2 following the solid–solid reaction of CaS and CaSO

“…The phase diagrams indicate the reactions from a non‐standard to the equilibrium state. According to the principles reported in previous studies, [ 8–12 ] phase diagrams of CaSO 4 reduction under CO, CH 4 , and S atmospheres were obtained (Figure 3). The predominant areas of CaSO 4 , CaS, and CaO species at a constant temperature were obtained.…”

Studies of in-situ calcium based sorbents in advanced pressurized coal conversion systems. Final report, June 1991--October 1994

“…These studies indicate that 0, starvation at the hot spots (created by the highly exothermic reaction) is a significant factor in causing the evolution of SO,. SO, emission was also reported by Lyngfelt (1989). He states that Cas and CaSO, are stable under reducing and oxidizing conditions, respectively while CaO is stable at intermediate conditions.…”

Multicycle Study on Chemical-Looping Combustion of Simulated Coal Gas with a CaSO4 Oxygen Carrier in a Fluidized Bed Reactor

“…The investigation of sulfur capture provides reference to the application of a CaSO 4 oxygen carrier in CLC. However, the cycle of CaSO 4 /CaS is different from the previous extensive investigations on the reduction decomposition of CaSO 4 in FBC systems performed by the Chalmers University of Technology in Sweden. − As demonstrated in the literature by Anthony and Granatstein, CaSO 4 is a thermodynamically stable product at typical FBC temperatures (800−950 °C) and overall oxidizing conditions. According to the extensive studies by Mattisson and Lyngfelt, CaSO 4 is the stable compound at highly oxidizing conditions, CaS is the stable product at strongly reducing conditions and in the presence of SO 2 , while CaO is favored thermodynamically in intermediate conditions .…”

Reduction of phosphogypsum for SO 2 production: Insights into the release characteristics of SO 2 following the solid–solid reaction of CaS and CaSO

“…The phase diagrams indicate the reactions from a non‐standard to the equilibrium state. According to the principles reported in previous studies, [ 8–12 ] phase diagrams of CaSO 4 reduction under CO, CH 4 , and S atmospheres were obtained (Figure 3). The predominant areas of CaSO 4 , CaS, and CaO species at a constant temperature were obtained.…”