The biomass fueled micro-scale CHP unit with stirling engine and two-stage vortex combustion chamber

The improved biomass (wood pellet) fuelled micro-CHP design is considered, based on 0.5 kWe Stirling engine, two-stage vortex combustion chamber, enhanced recuperator and waste heat utilizing heat exchanger are designed and tested. The vortex ejector was used between the primary (downdraft gasifier)...

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Bibliographic Details
Published in:Heat and mass transfer 2022, Vol.58 (7), p.1091-1103
Main Authors: Borisov, Igor, Khalatov, Artem, Paschenko, Denis
Format: Article
Language:English
Subjects:
Air supplies
Biomass burning
Combustion chambers
Dimpling
Downdraft
Efficiency
Electric generators
Engineering
Engineering Thermodynamics
Gas temperature
Gasification
Heat and Mass Transfer
Heat exchangers
Industrial Chemistry/Chemical Engineering
Low pressure
Original Article
Permanent magnets
Regenerators
Stirling engines
Suction
Thermal analysis
Thermodynamic efficiency
Thermodynamics
Vortices
Working fluids
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Summary:The improved biomass (wood pellet) fuelled micro-CHP design is considered, based on 0.5 kWe Stirling engine, two-stage vortex combustion chamber, enhanced recuperator and waste heat utilizing heat exchanger are designed and tested. The vortex ejector was used between the primary (downdraft gasifier) and secondary combustion chambers. The secondary air supplies tangentially to create the low pressure in the ejector axial zone for the wood gas suction from the primary chamber to secondary ceramic chamber. The product gas is mixed with secondary air and creates the combustible gas-air mixture. The γ-type Stirling engine with nitrogen as a working fluid and built-in electric generator with permanent magnets is used in CHP unit. The recuperator with heat transfer augmentation by surface dimples and protrusions with thermal efficiency of 0.68 was developed. The averaged gas temperature at the hot side of heat exchanger was 1150 °C, while the heat exchanger external surface temperature was 810 °C, which ensured the stable SE operation. The SE efficiency achieved in experiments is 14.8%, the overall CHP efficiency is 65%. A theoretical model which is able to simulate the main thermodynamic parameters of CHP unit was developed; the thermal analysis of CHP unit was made.
ISSN:0947-7411
1432-1181
DOI:10.1007/s00231-021-03165-z