skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Coal desulfurization in a rotary kiln combustor

Abstract

The purpose of this project was to demonstrate the combustion of coal and coal wastes in a rotary kiln reactor with limestone addition for sulfur control. The rationale for the project was the perception that rotary systems could bring several advantages to combustion of these fuels, and may thus offer an alternative to fluid-bed boilers. Towards this end, an existing wood pyrolysis kiln (the Humphrey Charcoal kiln) was to be suitably refurbished and retrofitted with a specially designed version of a patented air distributor provided by Universal Energy, Inc. (UEI). As the project progressed beyond the initial stages, a number of issues were raised regarding the feasibility and the possible advantages of burning coals in a rotary kiln combustor and, in particular, the suitability of the Humphrey Charcoal kiln as a combustor. Instead, an opportunity arose to conduct combustion tests in the PEDCO Rotary Cascading-Bed Boiler (RCBB) commercial demonstration unit at the North American Rayon CO. (NARCO) in Elizabethton, TN. The tests focused on anthracite culm and had two objectives: (a) determine the feasibility of burning anthracite culms in a rotary kiln boiler and (b) obtain input for any further work involving the Humphrey Charcoal kiln combustor. A number ofmore » tests were conducted at the PEDCO unit. The last one was conducted on anthracite culm procured directly from the feed bin of a commercial circulating fluid-bed boiler. The results were disappointing; it was difficult to maintain sustained combustion even when large quantities of supplemental fuel were used. Combustion efficiency was poor, around 60 percent. The results suggest that the rotary kiln boiler, as designed, is ill-suited with respect to low-grade, hard to burn solid fuels, such as anthracite culm. Indeed, data from combustion of bituminous coal in the PEDCO unit suggest that with respect to coal in general, the rotary kiln boiler appears inferior to the circulating fluid bed boiler.« less

Authors:
Publication Date:
Research Org.:
BCR National Lab., Pittsburgh, PA (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
6986558
Report Number(s):
DOE/PC/90169-T7; BCRNL-L-1665
ON: DE93005086
DOE Contract Number:
FG22-90PC90169
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; BITUMINOUS COAL; COCOMBUSTION; COMBUSTORS; PERFORMANCE; CULM; AIR POLLUTION CONTROL; ANTHRACITE; EXPERIMENTAL DATA; KILNS; LIMESTONE; PROGRESS REPORT; SULFUR OXIDES; BLACK COAL; CARBONACEOUS MATERIALS; CARBONATE ROCKS; CHALCOGENIDES; CHEMICAL REACTIONS; COAL; COMBUSTION; CONTROL; DATA; DOCUMENT TYPES; ENERGY SOURCES; FOSSIL FUELS; FUELS; INFORMATION; MATERIALS; MINERAL WASTES; NUMERICAL DATA; OXIDATION; OXIDES; OXYGEN COMPOUNDS; POLLUTION CONTROL; ROCKS; SEDIMENTARY ROCKS; SOLID WASTES; SULFUR COMPOUNDS; THERMOCHEMICAL PROCESSES; WASTES; 014000* - Coal, Lignite, & Peat- Combustion

Citation Formats

Cobb, J.T. Jr. Coal desulfurization in a rotary kiln combustor. United States: N. p., 1992. Web. doi:10.2172/6986558.
Cobb, J.T. Jr. Coal desulfurization in a rotary kiln combustor. United States. doi:10.2172/6986558.
Cobb, J.T. Jr. Fri . "Coal desulfurization in a rotary kiln combustor". United States. doi:10.2172/6986558. https://www.osti.gov/servlets/purl/6986558.
@article{osti_6986558,
title = {Coal desulfurization in a rotary kiln combustor},
author = {Cobb, J.T. Jr.},
abstractNote = {The purpose of this project was to demonstrate the combustion of coal and coal wastes in a rotary kiln reactor with limestone addition for sulfur control. The rationale for the project was the perception that rotary systems could bring several advantages to combustion of these fuels, and may thus offer an alternative to fluid-bed boilers. Towards this end, an existing wood pyrolysis kiln (the Humphrey Charcoal kiln) was to be suitably refurbished and retrofitted with a specially designed version of a patented air distributor provided by Universal Energy, Inc. (UEI). As the project progressed beyond the initial stages, a number of issues were raised regarding the feasibility and the possible advantages of burning coals in a rotary kiln combustor and, in particular, the suitability of the Humphrey Charcoal kiln as a combustor. Instead, an opportunity arose to conduct combustion tests in the PEDCO Rotary Cascading-Bed Boiler (RCBB) commercial demonstration unit at the North American Rayon CO. (NARCO) in Elizabethton, TN. The tests focused on anthracite culm and had two objectives: (a) determine the feasibility of burning anthracite culms in a rotary kiln boiler and (b) obtain input for any further work involving the Humphrey Charcoal kiln combustor. A number of tests were conducted at the PEDCO unit. The last one was conducted on anthracite culm procured directly from the feed bin of a commercial circulating fluid-bed boiler. The results were disappointing; it was difficult to maintain sustained combustion even when large quantities of supplemental fuel were used. Combustion efficiency was poor, around 60 percent. The results suggest that the rotary kiln boiler, as designed, is ill-suited with respect to low-grade, hard to burn solid fuels, such as anthracite culm. Indeed, data from combustion of bituminous coal in the PEDCO unit suggest that with respect to coal in general, the rotary kiln boiler appears inferior to the circulating fluid bed boiler.},
doi = {10.2172/6986558},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Sep 11 00:00:00 EDT 1992},
month = {Fri Sep 11 00:00:00 EDT 1992}
}

Technical Report:

Save / Share: