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Heat Integration Strategy for Economic Production of Combined Heat and Power from Biomass Waste

Sadhukhan, J, Ng, KS, Shah, N and Simons, HJ (2009) Heat Integration Strategy for Economic Production of Combined Heat and Power from Biomass Waste Energy Fuels, 23 (10). 5106 - 5120. ISSN 0887-0624

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Abstract

The objective of this work was to design a heat integrated, cost-effective, and cleaner combined heat and power (CHP) generation plant from low-cost, fourth-generation biomass waste feedstocks. The novelty lies in the development of systematic sitewide heat recovery and integration strategies among biomass integrated gasification combined cycle processes so as to offset the low heating value of the biomass waste feedstocks. For the biomass waste based CHP plant technical and economic analysis, the process was based on low-cost agricultural wastes like straws as the biomass feedstock and further established for a more predominant biomass feedstock, wood. The process was modeled using the Aspen simulator. Three conceptual flowsheets were proposed, based on the integration of the flue gas from the char combustor, which was separately carried out from the steam gasification of biomass volatalized gases and tars, and carbon dioxide removal strategies. The cost of energy production included detailed levelized discounted cash flow analysis and was found to be strongly influenced by the cost of feedstock. On the basis of a combined energy generation of 340−370 MW using straw wastes priced at 35.3 £/t or 40 Euro/t, with 8.5% and 8.61% by mass moisture and ash contents, respectively, the cost of electricity generation was 4.59 and 5.14 p/(kW h) for the cases without and with carbon capture respectively, with a 10% internal rate of return and 25 years of plant life. On the basis of the carbon capture value assigned by the Carbon Credits Trading scheme, a much constrained viable price of 22 £/t of such agricultural waste feedstocks for CHP generation was obtained, while up to 60 £/t of waste feedstocks can be economically viable under the UK Climate Change Levy, respectively.

Item Type: Article
Additional Information: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Energy Fuels, © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/ef900472s
Uncontrolled Keywords: STEAM REFORMING CATALYSTS, FLUIDIZED-BED, GAS-PRODUCTION, GASIFICATION, TAR, FEASIBILITY, TECHNOLOGY, COMBUSTION, GENERATION, OIL
Divisions: Faculty of Engineering and Physical Sciences > Centre for Environmental Strategy
Depositing User: Symplectic Elements
Date Deposited: 13 Apr 2012 10:49
Last Modified: 23 Sep 2013 19:21
URI: http://epubs.surrey.ac.uk/id/eprint/406525

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