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Exergy analysis of a polygeneration-enabled district heating and cooling system based on gasification of refuse derived fuel
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Universidade de Lisboa, Portugal.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-1837-5439
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: 0000-0002-3661-7016
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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. Vol. 141, p. 760-773
Keywords [en]
Exergy, Gasification, Synthetic natural gas, Polygeneration, District heating and cooling
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-199463DOI: 10.1016/j.jclepro.2016.09.151ISI: 000389090300069Scopus ID: 2-s2.0-84994494343OAI: oai:DiVA.org:kth-199463DiVA, id: diva2:1067929
Note

QC 20170123

Available from: 2017-01-23 Created: 2017-01-09 Last updated: 2018-04-27Bibliographically approved
In thesis
1. Polygeneration District Heating and Cooling Systems Based on Renewable Resources
Open this publication in new window or tab >>Polygeneration District Heating and Cooling Systems Based on Renewable Resources
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Traditional district heating (DH) and district heating and cooling (DHC) systems have to address two principal challenges: phase-out of fossil fuels in favor of renewables; and profit instability related to declines in heating and cooling demands along with electricity price fluctuations. These obstacles can be overcome at once through upgrading these systems to a polygeneration concept by means of a retrofitted air-steam gasifier and gas upgrading equipment, enabling the use of renewable feedstocks such as refuse derived fuel (RDF) and municipal solid waste (MSW). In particular, the polygeneration DHC system will be able to produce simultaneously heating, cooling, electricity and value-added products – char, syngas, synthetic natural gas (SNG) and hydrogen. This work investigates the retrofit of these DHC systems through a case study based on the existing Climaespaco facility, located in Lisboa, Portugal. Thermodynamic, exergy, economic, exergo-economic and environmental models were built in Engineering Equation Software (EES) and Matlab. Overall, both RDF and MSW were found to be technically feasible and economically viable for using as feedstocks in the polygeneration DHC system. SNG production integrated in the polygeneration DHC system through the air-steam gasification and gas upgrading equipment is judged to be practical and also boosts revenues. The highest energy efficiency is achieved for cases where char is the sole by-product. System efficiencies drop as other value-added products are included as system outputs, although the extent of the efficiency decline can be adjusted by regulating syngas and SNG production. The highest discounted net cash flows are found for the scenario where SNG, syngas and char are produced simultaneously. A payback period of 3 years was determined for this and the other cases. From the exergy and exergo-economic perspectives, the scenario of simultaneous char and syngas production is the most promising as the overall exergy efficiency has the highest value and product exergo-economic costs are the lowest. However, from the products diversity viewpoint, the simultaneous production of char, SNG, syngas and H2 is advantageous.

Place, publisher, year, edition, pages
Kungliga Tekniska högskolan, 2018. p. 128
Series
TRITA-ITM-AVL ; 2018:15
Keywords
district heating and cooling systems, polygeneration, refuse derived fuel, municipal solid waste, gasification.
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-226929 (URN)978-91-7729-785-7 (ISBN)
Public defence
2018-05-21, Meeting Room (0.19), Informatics II Building, Instituto Superior Tecnico,Av. Rovisco Pais,1049-001, Lisboa, Portugal, 17:28 (English)
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Supervisors
Available from: 2018-05-02 Created: 2018-04-27 Last updated: 2018-05-02Bibliographically approved

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