Kinetics of nitrogen and sulfur reactions in combustion systems: Quarterly technical progress report No. 9

Technical Report · Thu Jan 01 00:00:00 EST 1987

OSTI ID:6247083

The main thrust of the work was the continuation of the modeling studies of NO destruction by soot particulates. The computation took into account the decrease of soot concentration via oxidation. Since the mechanism of soot oxidation is governed mainly by the reaction between OH radicals and soot particulates, we have incorporated a limited set of detailed kinetics for the downflow coal flame. The kinetics included one hundred and nineteen reactions with twenty-seven species. The details of the modeling and the results are described. EER currently has four models of the SO/sub 2/-CaO high-temperature reaction: (1) the grain model of Silcox et al. (1985); (2) a pore model similar to that of Bhatia and Perlmutter (1980, 1981); (3) the distributed pore model of Newton and Pershing (1987); and (4) a distributed pore model similar to that of Christman and Edgar (1983). Recent work has focused on the latter two models, which are similar in many respects. They both consider a distribution of pore sizes obtained from porosimetry measurements, internal pore diffusion, filling of the pore structure with product (CaSO/sub 4/) as the reaction occurs, external diffusion to the particle surface, and sintering of the pore structure. The primary difference is that the model of Christman and Edgar (1983) considers the pores to be interconnected, while the model of Newton and Pershing (1987) assumes non-connected pores. Both models yield the same predictions of sorbent utilization when a mono-sized pore is considered (using the same physical constants). Pore mouth closure is predicted to control the extent of the SO/sub 2/-CaO reaction. When a distribution of pores is considered, the interconnected model yields higher predictions than the non-interconnected model.

• Research Organization: Energy and Environmental Research Corp., Irvine, CA (USA)
• DOE Contract Number: AC22-84PC70771
• OSTI ID: 6247083
• Report Number(s): DOE/PC/70771-T7; ON: DE87014472
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CALCIUM OXIDES
CHEMICAL REACTIONS
SORPTIVE PROPERTIES
HYDROCYANIC ACID
CHEMICAL REACTION KINETICS
NITRIC OXIDE
REDUCTION
SYNTHESIS
SULFUR DIOXIDE
MATHEMATICAL MODELS
OXIDATION
PARTICLE SIZE
POROSIMETERS
POROSITY
SOOT
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CYANIDES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MEASURING INSTRUMENTS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SIZE
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE PROPERTIES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
400200 - Inorganic
Organic
& Physical Chemistry