An investigation of CaO sulfation mechanisms in boiler sorbent injection

Abstract

A laboratory differential reactor study was conducted at temperatures of 975-1,275 K to investigate CaO sulfation mechanisms with calcine (CaO) samples derived from pulverized limestones and dolomites, and hydrated limes. The limestones had 8-1 15 pm mean particle sizes, a range applicable for boiler sorbent injection for SO, control. Under conditions applicable for boiler sorbent injection, the sorbent performance, in terms of initial reaction rate and saturation utilization, was limited by the SO2 pore diffusion rate and by premature pore mouth plugging by CaSO, product and, thus, depended on CaO particle size and pore size. Hydrated lime and Na,CO,-promoted limestones showed performance superior to that of limestones, because they produced calcines with larger pores. Intrinsic reaction rate as reported by Borgwardt and Bruce (1986) was observed at temperatures below 1,100 K.

Two-step rapid sulfur capture. Final report

“…The side duct burners were on, thereby producing elevated temperature, sulfur containing, simulated flue gases. The NE mode was achieved by injecting [4][5][6][7][8][9] SO2 into the oxidizer flow of the carrier burner in the sorbent activation module. The side duct burners could be either on or off.…”

“…SO2 mixing studies were performed during Phase IA to check quencWmixing section time [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] scales. With no activation duct modules in place, which corresponds to 0 ms activation time, SO2…”

“…See previous page. 41 8. Two-step Rapid S u l k Capture tests using heated gas sampling probes (1 50 F) studying cold reactor wall effects (lower radiative flux), lower sulfation temperature, and unactivated sorbent influences.…”

Removal of sulfur dioxide from a continuously operated binary fluidized bed reactor using inert solids and hydrated lime

“…This class of chemical reaction has been described in the literature by "Shrinking Core" type models in innumerable studies developed in the 1970s and improved upon to this day [3,[9][10][11][12][13][14][15][16]. absolute viscosity of the gas (kg/(m s)) µ 20 • C absolute viscosity of the gas at 20 • C (kg/(m s)) ρ g specific mass of the fluidization gas (kg/m 3 ) ρ g20 • C specific mass of the fluidization gas at 20 • C (kg/m 3 ) ρ sf specific mass of the fine particles (kg/m 3 ) ρ sg specific mass of the thick particles (kg/m 3 ) θ mean residence time of the solid reagent inside the bed (min)…”

Effects of CaO‐K2CO3 on combustion behavior and emission properties of SO2 and NOX during coal sludge combustion

“…In past years, there were many more investigations on using catalyst during coal combustion, and catalytic combustion was performed successfully to improve the combustion efficiency and desulfurization ratio. [1][2][3][4][5][6][7][8][9][10] However, these investigations were conducted on either desulfurization or catalytic combustion; the integrated researches on the effect of catalysts on coal combustion, pollution emission, and the fundamental reaction mechanisms are seldom researched. [11,12] Furthermore, most researches on coal combustion catalysts focus on bituminous, anthracite, lignite, and their blends.…”