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A technical and environmental analysis of co-combustion of coal and biomass in fluidised bed technologies

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

McIlveen-Wright, D, Huang, Y, Rezvani, S and Wang, YD (2007) A technical and environmental analysis of co-combustion of coal and biomass in fluidised bed technologies. Fuel, 86 (14). pp. 2032-2042. [Journal article]

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DOI: doi:10.1016/j.fuel.2007.02.011

Abstract

The use of biomass, which is considered to produce no net CO2 emissions in its life cycle, can reduce the effective CO2 emissions of a coal-fired power generation system, when co-fired with the coal, but may also reduce system efficiency.The technical and environmental analysis of fluidised bed technologies, using the ECLIPSE suite of process simulation software, is the subject of this study. System efficiencies for generating electricity are evaluated and compared for the different technologies and system scales.Several technologies could be applied to the co-combustion of biomass or waste and coal. The assessment studies here examine the potential for co-combustion of (a) a 600 MWe pulverised fuel (PF) power plant (as a reference system), (i) co-firing coal with straw and sewage sludge and (ii) using straw derived fuel gas as return fuel; (b) a 350 MWe pressurised fluidised bed combustion (PFBC) system co-firing coal with sewage sludge; (c) 250 MWe and 125 MWe circulating fluidised bed combustion (CFBC) plants co-firing coal with straw and sewage sludge; (d) 25 MWe CFBC systems co-firing low and high sulphur content coal with straw, wood and woody matter pressed from olive stones (WPOS); (e) 12 MWe CFBC co-firing low and high sulphur content coal with straw or wood; and (f) 12 MWe bubbling fluidised bed combustion (BFBC), also co-firing low and high sulphur content coal with straw or wood.In the large systems the use of both straw and sewage sludge resulted in a small reduction in efficiency (compared with systems using only coal as fuel).In the small-scale systems the high moisture content of the wood chips chosen caused a significant efficiency reduction.Net CO2 emissions are reduced when biomass is used, and these are compared for the different types and scales of fluidised bed technologies. NOx emissions were affected by a number of factors, such as bed temperature, amount of sorbent used for SO2 capture and HCl emitted.

Item Type:Journal article
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute > Centre for Sustainable Technologies (CST)
ID Code:10640
Deposited By:Dr David McIlveen-Wright
Deposited On:21 Mar 2011 11:39
Last Modified:21 Mar 2011 11:39

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