Hydration of spent limestone and dolomite to enhance sulfation in fluidized-bed combustion

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:6472293

Shearer, J A; Smith, G W; Moulton, D S; Turner, C B; Myles, K M; Johnson, I

The utilization of CaO in fluidized bed combustion can be markedly increased to reduce the cost and environmental impact of quarrying and disposing of large quantities of solid waste. A new method of treatment of spent bed material to reactivate its SO/sub 2/ capturing ability has been found. Partially sulfated spent overflow material from a fluidized-bed combustor is treated with water and then reintroduced to the combustor as renewed feed that further reacts with SO/sub 2/. This material has sufficient physical integrity, due to the outer layer of CaSO/sub 4/, and high reactivity to make it suitable as a sorbent feedstock. The work reported here details observations on a number of limestones and dolomites reacted in laboratory furnaces under simulated combustion conditions as well as verification of the effectiveness of the method in a 15-cm-ID process development unit scale atmospheric fluidized-bed coal combustor. Initial kinetic studies have also been made on the hydration reaction of partially sulfated limestone. A proposed mechanism of interaction is discussed to explain the enhanced reactivity. Changes in total porosity and pore size distribution in the partially sulfated material due to Ca(OH)/sub 2/ formation and its dehydration serve to open up the particle interior and its residual CaO to further reaction with SO/sub 2/. Almost complete utilization of the available CaO can be achieved by successive applications of this promising new technique.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6472293
• Report Number(s): CONF-800806-45; ON: DE81023124
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
ALKALINE EARTH METAL COMPOUNDS
BENCH-SCALE EXPERIMENTS
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CALCIUM OXIDES
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
DATA
DOLOMITE
ENERGY SOURCES
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUELS
FUNCTIONAL MODELS
HYDRATION
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
LIMESTONE
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
MINERALS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PROCESS DEVELOPMENT UNITS
REGENERATION
ROCKS
SEDIMENTARY ROCKS
SOLVATION
THERMOCHEMICAL PROCESSES