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Title: Combustion, heat transfer, pollutant emission, and ash deposition characteristics of concentrated Coal-Water Slurries. Interim report, Phase I

Abstract

A detailed combustion characterization study is underway at the MIT Combustion Research Facility (CRF), on industrial type (turbulent diffusion) flames obtained with Coal-Water Slurries (CWS). The objectives of the study are to characterize CWS flames, obtained under a variety of input conditions characteristic of boiler operation, with respect to ignition, flame stability, carbon conversion efficiency, radiative heat transfer, gaseous pollutant emissions (NO/sub x/) and the physical-chemical nature of the in-flame particulate matter and ash deposits formed upon the fireside surfaces of the combustion chamber. Results are reported on the first experimental trials carried out at the CRF in the on-going research program. The experimental results demonstrated that ignition and flame stability raise potentially serious technical problems in the combustion of this substitute fuel, and that they are highly sensitive to the quality of atomization, to the pattern of gas flow near the burner (near-field aerodynamics), to the heat extraction and to air preheat. High levels of combustion air swirl were found to greatly enhance the stability of CWS flames. Increased swirl causes more intense recirculation of hot combustion products to the flame root, resulting in a high convective feedback of heat to the fuel spray entering the combustion chamber. However,more » conditions favoring rapid ignition and flame stability - intense fuel-air mixing, high air preheat, low near-field heat extraction - also tend to increase NO/sub x/ emission problem. In general, the selection of the best or optimal CWS flame input conditions will reflect a compromise in these conflicting requirements. 3 references.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Massachusetts Inst. of Tech., Cambridge (USA)
OSTI Identifier:
6649358
Report Number(s):
DOE/PC/40292-T2
ON: DE84015910
DOE Contract Number:  
FG22-81PC40292
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; ASHES; CHEMICAL ANALYSIS; FLAMES; CHEMICAL COMPOSITION; STABILITY; TEMPERATURE MEASUREMENT; FUEL SLURRIES; COMBUSTION PRODUCTS; COMBUSTION PROPERTIES; IGNITION; COAL; DEPOSITION; EXPERIMENTAL DATA; HEAT TRANSFER; MIXTURES; NITROGEN OXIDES; RESEARCH PROGRAMS; SCANNING ELECTRON MICROSCOPY; TEST FACILITIES; WATER; CARBONACEOUS MATERIALS; CHALCOGENIDES; DATA; DISPERSIONS; ELECTRON MICROSCOPY; ENERGY SOURCES; ENERGY TRANSFER; FOSSIL FUELS; FUELS; HYDROGEN COMPOUNDS; INFORMATION; MATERIALS; MICROSCOPY; NITROGEN COMPOUNDS; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; RESIDUES; SLURRIES; SUSPENSIONS; 014000* - Coal, Lignite, & Peat- Combustion

Citation Formats

Beer, J M, Farmayan, W F, Teare, J D, Monroe, L S, and Srinivasachar, S. Combustion, heat transfer, pollutant emission, and ash deposition characteristics of concentrated Coal-Water Slurries. Interim report, Phase I. United States: N. p., 1983. Web.
Beer, J M, Farmayan, W F, Teare, J D, Monroe, L S, & Srinivasachar, S. Combustion, heat transfer, pollutant emission, and ash deposition characteristics of concentrated Coal-Water Slurries. Interim report, Phase I. United States.
Beer, J M, Farmayan, W F, Teare, J D, Monroe, L S, and Srinivasachar, S. Sat . "Combustion, heat transfer, pollutant emission, and ash deposition characteristics of concentrated Coal-Water Slurries. Interim report, Phase I". United States.
@article{osti_6649358,
title = {Combustion, heat transfer, pollutant emission, and ash deposition characteristics of concentrated Coal-Water Slurries. Interim report, Phase I},
author = {Beer, J M and Farmayan, W F and Teare, J D and Monroe, L S and Srinivasachar, S},
abstractNote = {A detailed combustion characterization study is underway at the MIT Combustion Research Facility (CRF), on industrial type (turbulent diffusion) flames obtained with Coal-Water Slurries (CWS). The objectives of the study are to characterize CWS flames, obtained under a variety of input conditions characteristic of boiler operation, with respect to ignition, flame stability, carbon conversion efficiency, radiative heat transfer, gaseous pollutant emissions (NO/sub x/) and the physical-chemical nature of the in-flame particulate matter and ash deposits formed upon the fireside surfaces of the combustion chamber. Results are reported on the first experimental trials carried out at the CRF in the on-going research program. The experimental results demonstrated that ignition and flame stability raise potentially serious technical problems in the combustion of this substitute fuel, and that they are highly sensitive to the quality of atomization, to the pattern of gas flow near the burner (near-field aerodynamics), to the heat extraction and to air preheat. High levels of combustion air swirl were found to greatly enhance the stability of CWS flames. Increased swirl causes more intense recirculation of hot combustion products to the flame root, resulting in a high convective feedback of heat to the fuel spray entering the combustion chamber. However, conditions favoring rapid ignition and flame stability - intense fuel-air mixing, high air preheat, low near-field heat extraction - also tend to increase NO/sub x/ emission problem. In general, the selection of the best or optimal CWS flame input conditions will reflect a compromise in these conflicting requirements. 3 references.},
doi = {},
url = {https://www.osti.gov/biblio/6649358}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {10}
}

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