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Title: A novel coal feeder for production of low sulfur fuel

Abstract

A novel coal feeding system is currently undergoing testing and evaluation at the University of Cincinnati. The system consists primarily of an auger feed tube which is used to both convey and provide desulfurization of a high sulfur coal feedstock. The coal is conveyed at temperatures ranging from 350 to 550 {degrees}C and under normal atmospheric pressure. Under these mild processing conditions, the coal partially pyrolizes and emits sulfur in the form of hydrogen sulfide while maintaining a relatively high heating value in the char product. The evolved gases are evacuated from the reactor (the feed tube) to another absorbing bed where H{sub 2}S reacts with the sorbent, usually lime or limestone. The resultant sorbent utilization is substantially higher than the values found in current dry scrubbing system and the produced low-sulfur char may then be used in a conventional steam boiler.

Authors:
; ;
Publication Date:
Research Org.:
Cincinnati Univ., OH (United States). Coll. of Engineering
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
5066262
Report Number(s):
DOE/PC/89781-1
ON: DE92016166
DOE Contract Number:
FG22-89PC89781
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; CALCIUM OXIDES; SORPTIVE PROPERTIES; COAL; DESULFURIZATION; PYROLYSIS; FUEL FEEDING SYSTEMS; DESIGN; LIMESTONE; HYDROGEN SULFIDES; PROGRESS REPORT; ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CARBONACEOUS MATERIALS; CARBONATE ROCKS; CHALCOGENIDES; CHEMICAL REACTIONS; DECOMPOSITION; DOCUMENT TYPES; ENERGY SOURCES; FOSSIL FUELS; FUEL SYSTEMS; FUELS; HYDROGEN COMPOUNDS; MATERIALS; OXIDES; OXYGEN COMPOUNDS; ROCKS; SEDIMENTARY ROCKS; SULFIDES; SULFUR COMPOUNDS; SURFACE PROPERTIES; THERMOCHEMICAL PROCESSES; 010402* - Coal, Lignite, & Peat- Purification & Upgrading; 010409 - Coal, Lignite, & Peat- Pyrolysis & Carbonization- (1987-); 013000 - Coal, Lignite, & Peat- Transport, Handling, & Storage

Citation Formats

Keener, T.C., Khang, S.J., and Yu, X.L.. A novel coal feeder for production of low sulfur fuel. United States: N. p., 1990. Web. doi:10.2172/5066262.
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Keener, T.C., Khang, S.J., & Yu, X.L.. A novel coal feeder for production of low sulfur fuel. United States. doi:10.2172/5066262.
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Keener, T.C., Khang, S.J., and Yu, X.L.. Mon . "A novel coal feeder for production of low sulfur fuel". United States. doi:10.2172/5066262. https://www.osti.gov/servlets/purl/5066262.
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@article{osti_5066262,
title = {A novel coal feeder for production of low sulfur fuel},
author = {Keener, T.C. and Khang, S.J. and Yu, X.L.},
abstractNote = {A novel coal feeding system is currently undergoing testing and evaluation at the University of Cincinnati. The system consists primarily of an auger feed tube which is used to both convey and provide desulfurization of a high sulfur coal feedstock. The coal is conveyed at temperatures ranging from 350 to 550 {degrees}C and under normal atmospheric pressure. Under these mild processing conditions, the coal partially pyrolizes and emits sulfur in the form of hydrogen sulfide while maintaining a relatively high heating value in the char product. The evolved gases are evacuated from the reactor (the feed tube) to another absorbing bed where H{sub 2}S reacts with the sorbent, usually lime or limestone. The resultant sorbent utilization is substantially higher than the values found in current dry scrubbing system and the produced low-sulfur char may then be used in a conventional steam boiler.},
doi = {10.2172/5066262},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1990},
month = {Mon Jan 01 00:00:00 EST 1990}
}
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Technical Report:
View Technical Report (0.67 MB)
DOI:  10.2172/5066262
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  • ;
    During the past three months, the coal feeding system has been tested and currently undergoing evaluation at the University of Cincinnati. The system consists primarily of an auger feed tube which is used to both convey and provide desulfurization of a high sulfur coal feedstock. The coal is conveyed at temperatures ranging from 350 to 550{degrees}C and under normal atmospheric pressure. Under these mild processing conditions, the coal partially pyrolizes and emits sulfur in the form of hydrogen sulfide while maintaining a relatively high heating value in the char product. The evolved gases are evacuated from the reactor (the feedmore » tube) to another absorbing bed where H{sub 2}S reacts with the sorbent, usually lime or limestone. The resultant sorbent utilization is substantially higher than the values found in current dry scrubbing system and the produced low-sulfur char may then be used in a conventional steam boiler.« less

  • ; ;
    A dual-screw feeder was designed and tested for desulfurization of coal. The key parts of this reactor are two screw tubes which independently feed coal and calcined lime, the inner tube acting as a coal pyrolizer and the outer tube acting as a desulfurizer with hot calcined lime pellets or other renewable sorbent pellets. The objective of this project is to study the feasibility of this advanced concept of desulfurization using the coal feeder. In this quarter, the following tasks have been performed: (1) Analytical measurements of the organic sulfur content in the feed coal and the product char, (2)more » setting up the combustor which is physically attached to the feeder system and will be used to study the combustion characteristics of char and volatiles produced from the pyrolysis process. The following preliminary conclusions have been obtained: (1) A 73.1% of the organic sulfur in Ohio {number sign}8 coal was removed in the dual-screw feeder reactor at a temperature of 475{degrees}C with the residence time of 6 min. (2) The combustor works stably and the operating temperature of the combustor can be adjusted by controlling the char feed rate and the air flowrate. 2 tabs.« less

  • ;
    A dual-screw feeder was designed for desulfurization of coal. This reactor contains two screw tubes which are the heart parts, the inner tube acting as a coal pyrolizer and the outer tube acting as a desulfurizer with hot calcined lime pellets or other renewable sorbent pellets. The objective of this project is to study the feasibility of an advanced concept of desulfurization in this coal feeder. In this quarter, the following tasks have been performed: (1) Determine the pyrolysis product and the sulfur distribution in char, tar and gas based on more experimental data; (2) study the devolatilization and themore » desulfurization kinetics, obtain the basic kinetic parameters; (3) study the sulfur removal efficiency of lime pellets fed into the outer tube of the dual-feeder reactor. Some preliminary conclusions have been obtained: (1) Under the experimental condition, the devolatilization process, as well as the desulfurization process, can be simulated by a first-order reaction model. (2) The desulfurization rate increases quickly with temperature. (3) The activation energies for devolatilization and desulfurization are approximately 14,090 cal/mol and 5389 cal/mol respectively. (4) The H{sub 2}S concentration in gas after reacted with lime pellets is below the detection limit of our gas chromatograph, which demonstrated the very high sulfur removal efficiency of CaO pellets in this dual-feeder reactor. 8 figs., 7 tabs.« less

  • ;
    The objective of this project is to study the feasibility of an advanced desulfurization concept in a coal feeder. The coal feeder reactor contains two screws. The inner screw feeder acts as a coal pyrolizer and the outer screw feeder acts as a desulfurizer with hot calcined limestone pellets or other renewable sorbent pellets. In this quarter, the following tasks have been performed: (1) determine the product distribution of pyrolysis, (2) determine the sulfur distribution in char, tar and gas, (3) study the pyrolysis kinetics on the dual-screw reactor, and (4) study desulfurization under pyrolysis condition. Some preliminary conclusion havemore » been obtained: (1) the devolatization process can be simulated by a first-order reaction assumption, (2) as the reaction temperature increased, the product ratio of tar to gas decreased, (3) the desulfurization rate increases quickly with temperature, and (4) the concentration of H{sub 2}S in pyrolysed gas dose not change with residence time. 5 figs., 3 tabs.« less

  • ; ;
    In this project, a dual-screw feeder was designed for desulfurization of coal. The key parts of this reactor are two screw tubes which are used to feed coal and calcined lime particles separately, the inner tube acting as a coal pyrolyzer and the outer tube acting as a desulfurizer with hot calcined lime pellets or other renewable sorbent pellets. The objective of this project is to study the feasibility of an advanced concept of desulfurization in the coal feeder. (VC)