Techno-economic assessment of municipal solid waste gasification for electricity generation: A case study of Kampala City, Uganda
2015 (English)In: E-journal CIGR, ISSN 1682-1130, E-ISSN 1682-1130, Vol. 17, no 4, 141-155 p.Article in journal (Refereed) PublishedText
This study was aimed at assessing the techno-economic potential of municipal solid waste (MSW) generated in Kampala City for electricity production through gasification. The quantity, characteristics and gasification parameters were determined. In addition, the gasifier- engine system components were sized, and an economic analysis was conducted to obtain the net present value (NPV) and the payback period. This study found that 523 t/d of MSW is collected in Kampala City. The biomass component of MSW was found to be 459.5 t/d with moisture content of 71.09% on as-received basis. The physical characteristics of the gasified biomass included 11.8% moisture content, 88.2% total solids, 25.9% ash content and 57.7 kg/m3 bulk density. The resulting normalized producer gas constituted 11.64% H2, 13.70% CO, 16.09% CO2, 54.12% N2, 4.45% CH4 and lower heating value (LHV) of 4.75 MJ/Nm3. The design fuel flow rate of 0.23 kg/s, specific gasification rate (SGR) of 5089.29 kg h-1 m-2 and specific energy demand of 42.75 GJ m-2 h-1 were obtained. This yields a net electrical power output of 425.17 kW with an overall efficiency of 15.6%. The net annual electricity generation from a single gasifier-engine system was found to be 2.97 GWh/a. The economic analysis for this system worth $887 333 of investment cost yielded a payback period of 6.57 years while the NPV at 6% interest rate was found to be nine years with a value of $316 47.
Place, publisher, year, edition, pages
Int. Comm. of Agricultural and Biosystems Engineering , 2015. Vol. 17, no 4, 141-155 p.
Biomass, Economic analysis, Electricity, Gasification, Municipal solid waste, Producer gas
IdentifiersURN: urn:nbn:se:kth:diva-181837ScopusID: 2-s2.0-84951975155OAI: oai:DiVA.org:kth-181837DiVA: diva2:902428
QC 201602112016-02-112016-02-052016-02-11Bibliographically approved