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2017 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 141, p. 760-773Article in journal (Refereed) Published
Abstract [en]
District heating and cooling (DHC) systems, modified or retrofitted with integration of gasifiers and gas upgrading equipment, represent promising alternatives to traditional approaches since various scenarios of products complementary to heat, cold, and electricity can be realized, namely: char only; char and syngas; char, synthetic natural gas (SNG) and hydrogen (H-2); and char, syngas, SNG and H-2. This manuscript evaluates a polygeneration-enabled DHC system in detail (operation during a typical year) from exergetic and exergoeconomic perspectives. The base DHC system utilizes natural gas as fuel with a nominal capacity of 29 MW heat, 35 MW of cold, and 5 MW of electricity. The retrofit employs refuse derived fuel (RDF) as feedstock to an atmospheric gasifier with downstream gas clean-up, a gas turbine, and a heat recovery steam generator along with heat exchangers for integration with the base DHC system. The exergy analysis revealed that the polygeneration system presents adequate performance at all scenarios established. Among the sets of value-added products the combination of char and syngas is the most beneficial as the system efficiency reaches a value of similar to 72%. The outcomes of the exergoeconomic analysis support the exergy results. The lower production costs for value-added products are achieved for the maximum simultaneous char and syngas production, with each of these costs estimated to be 6.1 USD/GJ.
Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Exergy, Gasification, Synthetic natural gas, Polygeneration, District heating and cooling
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-199463 (URN)10.1016/j.jclepro.2016.09.151 (DOI)000389090300069 ()2-s2.0-84994494343 (Scopus ID)
Note
QC 20170123
2017-01-232017-01-092018-04-27Bibliographically approved