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Title: Cofiring of biofuels in coal fired boilers: Results of case study analysis

Abstract

Ebasco Environmental and Reaction Engineering, under contract to EPRI, performed a case study analysis of cofiring biomass in coal-fired boilers of the Tennessee Valley Authority (TVA). The study was also sponsored by DOE. This analysis included evaluating wood fuel receiving, preparation, and combustion in pulverized coal (PC) boilers and cyclone furnaces and an assessment of converting wood into pyrolysis oil or low Btu gas for use in a new combined cycle combustion turbine (CCCT) installation. Cofiring wood in existing coal-fired boilers has the most immediate potential for increasing the utilization of biofuels in electricity generation. Cofiring biofuels with coal can potentially generate significant benefits for utilities including: (1) reducing emissions of SO{sub 2} and NO{sub x}; (2) reducing the net emissions of CO{sub 2}; (3) potentially reducing the fuel cost to the utility depending upon local conditions and considering biomass is potentially exempt from the proposed Btu tax and may get a 1.5 cent/kWh credit for energy generated by wood combustion; (4) supporting local industrial forest industry; and (5) providing a long term market for the development of a biofuel supply and delivery industry. Potential benefits are reviewed in the context of cofiring biofuel at a rate of 15% heatmore » input to the boiler, and compares this cofiring strategy and others previously tested or developed by other utilities. Other issues discussed include: (1) wood fuel specifications as a function of firing method; (2) wood fuel receiving and preparation system requirements; (3) combustion system requirements for cofiring biofuels with coal; (4) combustion impacts of firing biofuels with coal; (5) system engineering issues; (6) the economics of cofiring biofuel with coal. The Allen, TN 330 MW(e) cyclone boiler and Kingston, TN 135 MW(e) Boiler {number_sign}1, a tangentially fired PC unit, case studies are then summarized in the paper, highlighting the cofiring opportunities.« less

Authors:
 [1];  [2];  [3]
  1. Ebasco Environmental, Sacramento, CA (United States)
  2. Electric Power Research Institute, Palo Alto, CA (United States)
  3. TVA, Chattanooga, TN (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
OSTI Identifier:
140310
Report Number(s):
NREL/CP-200-5768-Vol.1; CONF-9308106-Vol.1
ON: DE93010050; TRN: 93:003926-0041
Resource Type:
Conference
Resource Relation:
Conference: 1. biomass conference of the Americas: energy, environment, agriculture, and industry, Burlington, VT (United States), 30 Aug - 2 Sep 1993; Other Information: PBD: [1993]; Related Information: Is Part Of First Biomass Conference of the Americas: Energy, environment, agriculture, and industry; Proceedings, Volume 1; PB: 796 p.
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; COAL; COCOMBUSTION; EVALUATION; ECONOMIC IMPACT; WOOD FUELS; BOILERS; BIOMASS; ENGINEERING; ELECTRIC POWER; EPRI; TENNESSEE VALLEY AUTHORITY; LOW BTU GAS; ELECTRICITY; SULFUR DIOXIDE; NITROGEN OXIDES; CARBON DIOXIDE; FOSSIL FUELS; FOSSIL-FUEL POWER PLANTS; AIR POLLUTION ABATEMENT; ENVIRONMENTAL IMPACTS

Citation Formats

Tillman, D A, Hughes, E, and Gold, B A. Cofiring of biofuels in coal fired boilers: Results of case study analysis. United States: N. p., 1993. Web.
Tillman, D A, Hughes, E, & Gold, B A. Cofiring of biofuels in coal fired boilers: Results of case study analysis. United States.
Tillman, D A, Hughes, E, and Gold, B A. 1993. "Cofiring of biofuels in coal fired boilers: Results of case study analysis". United States. https://www.osti.gov/servlets/purl/140310.
@article{osti_140310,
title = {Cofiring of biofuels in coal fired boilers: Results of case study analysis},
author = {Tillman, D A and Hughes, E and Gold, B A},
abstractNote = {Ebasco Environmental and Reaction Engineering, under contract to EPRI, performed a case study analysis of cofiring biomass in coal-fired boilers of the Tennessee Valley Authority (TVA). The study was also sponsored by DOE. This analysis included evaluating wood fuel receiving, preparation, and combustion in pulverized coal (PC) boilers and cyclone furnaces and an assessment of converting wood into pyrolysis oil or low Btu gas for use in a new combined cycle combustion turbine (CCCT) installation. Cofiring wood in existing coal-fired boilers has the most immediate potential for increasing the utilization of biofuels in electricity generation. Cofiring biofuels with coal can potentially generate significant benefits for utilities including: (1) reducing emissions of SO{sub 2} and NO{sub x}; (2) reducing the net emissions of CO{sub 2}; (3) potentially reducing the fuel cost to the utility depending upon local conditions and considering biomass is potentially exempt from the proposed Btu tax and may get a 1.5 cent/kWh credit for energy generated by wood combustion; (4) supporting local industrial forest industry; and (5) providing a long term market for the development of a biofuel supply and delivery industry. Potential benefits are reviewed in the context of cofiring biofuel at a rate of 15% heat input to the boiler, and compares this cofiring strategy and others previously tested or developed by other utilities. Other issues discussed include: (1) wood fuel specifications as a function of firing method; (2) wood fuel receiving and preparation system requirements; (3) combustion system requirements for cofiring biofuels with coal; (4) combustion impacts of firing biofuels with coal; (5) system engineering issues; (6) the economics of cofiring biofuel with coal. The Allen, TN 330 MW(e) cyclone boiler and Kingston, TN 135 MW(e) Boiler {number_sign}1, a tangentially fired PC unit, case studies are then summarized in the paper, highlighting the cofiring opportunities.},
doi = {},
url = {https://www.osti.gov/biblio/140310}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 31 00:00:00 EST 1993},
month = {Fri Dec 31 00:00:00 EST 1993}
}

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