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Energy and economic assessment of a polygeneration district heating and cooling system based on gasification of refuse derived fuels
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, Heat and Power Technology.ORCID iD: 0000-0002-3661-7016
2017 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 137, p. 696-705Article in journal (Refereed) Published
Abstract [en]

Conventional district heating and cooling (DHC) systems are compelled to reduce their fossil fuel dependency while ensuring profitability as cooling and heating demands decline. One solution is to retrofit the system with a gasifier and product gas upgrading equipment so that the system will be able to diversify its fuel input, including biomass and waste resources, while simultaneously producing synthetic natural gas (SNG), synthetic gas (syngas) and char complementarily to heat, cold and electricity. The main objective of this study is to assess energetically and economically a polygeneration DHC system based on gasification of refuse derived fuels considering the following sub-product scenarios: char; char and syngas; char and SNG; and char, syngas and SNG. The results show that when char is the only sub product of the modified DHC system, the investment payback is 3 years, the discounted net cash flow (DNCF) is 142 mln USD, and the system trigeneration efficiency is 83.6%. When other sub-products are supplied by the system, its performance reduces but the system DNCF increases, while the investment payback remains constant.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 137, p. 696-705
Keywords [en]
Gasification, Polygeneration, District heating and cooling system, Energy and economic assessment
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-219347DOI: 10.1016/j.energy.2017.06.110ISI: 000414879400062Scopus ID: 2-s2.0-85021386850OAI: oai:DiVA.org:kth-219347DiVA, id: diva2:1162774
Conference
29th International Conference on Efficiency, Cost, Optimisation, Simulation, and Environmental Impact of Energy Systems (ECOS), JUN 19-23, 2016, Portoroz, SLOVENIA
Note

QC 20171205

Available from: 2017-12-05 Created: 2017-12-05 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)
Opponent
Supervisors
Available from: 2018-05-02 Created: 2018-04-27 Last updated: 2018-05-02Bibliographically approved

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Kabalina, NataliaWeihong, YangMartin, Andrew R.

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