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CONCEPT OF CO-FIRING COAL WITH BIOMASS AND NATURAL GAS: ON TRACK OF SUSTAINABLE SOLUTION FOR FUTURE THERMAL POWER PLANTS

ABSTRACT
This paper presents R&D project of multi fuel concept (MFC) for future coal-based power plants, demonstrated on example of cofiring Middle-Bosnia brown coal with waste woody biomass and natural gas. Pulverised Combustion (PC) lab-scale furnace has been used for the cofiring tests, varying up to 20%w portion of biomass and up to 10%th portion of natural gas in the fuel mix. Tests were purposed to optimize the combustion temperature, air distribution, including Over Fire Air System (OFAS), fuel combination and fuel distribution, including reburning concept, as function of emissions and combustion efficiency estimated through the ash deposits behaviours and unburnt. Considering application of proposed MFC in case of TPP Kakanj unit 6 (118 MWe) set here as a referent power plant, temperature levels and fuel distributions for lowest emissions of CO2 and NOx were found during lab tests, provided that combustion efficiency is at an acceptable level. Derived research results yield input data for calculation sustainability indicators of MFC for the referent power plant, considering 6 fuel options - different combinations of coal, biomass and natural gas. Single criteria analysis and multicriteria sustainability assessment have been done, giving an advantage to the options of cofiring coal with woody biomass and natural gas in the case demonstrated.
KEYWORDS
PAPER SUBMITTED: 2015-11-26
PAPER REVISED: 2016-03-29
PAPER ACCEPTED: 2016-03-30
PUBLISHED ONLINE: 2016-04-09
DOI REFERENCE: 10.2298/TSCI151126078H
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE 4, PAGES [1171 - 1184]
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© 2017 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence