Denitrification and desulfurization of combustion gases. Quarterly technical progress report No. 5, September 18-December 17, 1981. [Sulfation]

Technical Report · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6292161

Desai, N J; Ramanathan, K; Yang, R T

A complete kinetics study of iron oxide catalyzed sulfation has been performed. From the kinetics data, a calculation has been made to estimate the improvement of the performance of a fluidized-bed combustor using Fe/sub 2/O/sub 3/ coated sorbent. For Tymochtee dolomite, with 1.08% (by weight based on CaO contained in sorbent) Fe/sub 2/O/sub 3/ coated on uncalcined stone, it has been shown using the MIT FBC model that for 90% sulfur retention, a 40% reduction of the sorbent requirement is achieved over the uncatalyzed case. In other words, Ca/S ratio = 2.5 for the uncoated stone, whereas Ca/S = 1.5 for the coated case, for the same sulfur retention. Although the Fe/sub 2/O/sub 3/ coating procedure works well for Tymochtee dolomite, it has an inhibiting effect on the Greer limestone. This is a result of plugging of pore mouths. A complete study (both modeling and experimental) has been done to show the interplay of the two opposing effects: increase in chemical rate by Fe/sub 2/O/sub 3/ and decrease in pore diffusion rate due to plugging. A complete study of the kinetics of the reaction between Greer limestone and NO under combustion gas conditions has been made. The reaction becomes quite reversible, i.e., the NO concentration in combustion gas approached the equilibrium value, at slightly above 400/sup 0/C. The thermodynamic equilibrium values have been measured with TGA. Basic kinetics data were gathered, which may be used for reactor design. 8 references, 35 figures, 10 tables.

• Research Organization: State Univ. of New York, Buffalo (USA). Dept. of Chemical Engineering
• DOE Contract Number: AC22-80MC14617
• OSTI ID: 6292161
• Report Number(s): DOE/MC/14617-T5; ON: DE85004213
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
20 FOSSIL-FUELED POWER PLANTS
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
ABSORPTION
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COMBUSTION
DATA
DENITRIFICATION
DEPOSITION
DESULFURIZATION
DOLOMITE
EXPERIMENTAL DATA
FLUE GAS
FLUIDIZED-BED COMBUSTION
GASEOUS WASTES
HIGH TEMPERATURE
INFORMATION
IRON COMPOUNDS
IRON OXIDES
KINETICS
LIMESTONE
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POROSITY
REACTION KINETICS
ROCKS
SEDIMENTARY ROCKS
SULFATES
SULFUR COMPOUNDS
SURFACE COATING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
WASTES
YIELDS