Performance analysis of a biomass powered micro-cogeneration system based on gasification and syngas conversion in a reciprocating engine

•A review of micro combined heat and power bioenergy systems is presented.•Features of an innovative bioenergy system (20kWe and 40kWth) are shown.•An experimental characterization of the bioenergy system is realized.•Global energy balance and Sankey diagram are presented.•The effects of users'...

Celý popis

Uložené v:
Podrobná bibliografia
Vydané v:Energy conversion and management Ročník 175; s. 33 - 48
Hlavní autori: La Villetta, M., Costa, M., Cirillo, D., Massarotti, N., Vanoli, L.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Oxford Elsevier Ltd 01.11.2018
Elsevier Science Ltd
Predmet:
Biomass
Biomass energy production
Calorific value
Cogeneration
cold
Cold gas
Combustion
Combustion efficiency
cooling
Cooling water
Energy balance
Energy conversion
Energy conversion efficiency
Flow measurement
Flow rates
Gas chromatography
Gasification
Heat recovery
Imbert downdraft
Internal combustion engines
mass flow
Mass flow rate
Micro combined heat and power
Piston engines
Synthesis gas
temperature
Thermal energy
Thermal power
Thermodynamic efficiency
Thermoelectricity
Volumetric efficiency
Waste heat recovery
Waste recovery
Working conditions
Energy balance
Gasification
Biomass
Micro combined heat and power
Imbert downdraft
ISSN:0196-8904, 1879-2227
On-line prístup:Získať plný text
Tagy: Pridať tag
Žiadne tagy, Buďte prvý, kto otaguje tento záznam!
Popis
Shrnutí:•A review of micro combined heat and power bioenergy systems is presented.•Features of an innovative bioenergy system (20kWe and 40kWth) are shown.•An experimental characterization of the bioenergy system is realized.•Global energy balance and Sankey diagram are presented.•The effects of users' temperature on efficiencies of the bioenergy system are shown. The present paper describes an experimental characterisation of a biomass powered micro-cogeneration system based on the coupling between a gasifier and an internal combustion engine. The ECO 20 unit is sized to deliver a maximum electrical and thermal power of 20 kWe and 40 kWth, respectively. In order to highlight possible inefficiencies along the biomass-to-energy conversion chain, the global energy balance of the system under real working conditions is derived. Ultimate and proximate analyses of the processed biomass are performed, accompanied by temperature and mass flow rate measurements and gas chromatograph characterization of collected samples of the produced syngas. The greatest inefficiency is found in the gasification section with a value of the cold gas efficiency in the range of 57–60%. The low quality of the syngas (lower heating value equal to 3731 kJ/Nm3) affects the engine combustion efficiency, hence its electrical efficiency that does not exceed 22.5%. The global electrical efficiency of the plant is equal to about 13.5%. As a further analysis, waste heat recovery is considered under different conditions by decreasing the temperature of the water flowing in the secondary circuit from 68.35 °C to 20.50 °C for the use of the provided thermal energy. This determines an increase of the thermal efficiency of the engine from 11.3% to 56.2%, while the global thermal efficiency increases from 6.46% to 33.72%. A feature of the ECO 20 system is the cooling of the syngas delivered to the engine by its same cooling water, for a considerable advantage on volumetric efficiency with respect to other analogous systems, also in the cases the thermal power is not utilised.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
content type line 23
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2018.08.017