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Stirling-aided heat and power (10 kW) production from wood pellets and planning a miniature ESP for small scale combustion. Martti Aho Research director, Renewable energy programmes, University of Jyvaskyla Evaluation of the Energy Research In Finland 1999 - 2005,
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Stirling-aided heat and power (10 kW) production from wood pellets and planning a miniature ESP for small scale combustion Martti Aho Research director, Renewable energy programmes, University of Jyvaskyla Evaluation of the Energy Research In Finland 1999 - 2005, 31.05.2006 in University of Jyväskylä
Goal of research • Demonstration of electricity production from wood pellets in 10 kWe size in minimum of 15% efficiency (from fuel energy) without operational problems
Stirling-aided power production:State of art • Routine from natural gas: Electricity can be produced with efficiency of about 25%. • Power production from solid biomass is in research stage because of ash related problems • Experiments in very small scale (1 kWe) has been conducted in the U.S. • Experiments in 37-75 MWe scale have been conducted by Technical University of Denmark (DTU) and Austrian research centres. No commercial products yet.
Concept under development Traditional pellet boiler Water
Example of CFD calculations: Fuel power 60 kW High landa (a) and fuel gas recirculation (b) with equal mass flow of flue gas λ=1,47, circ. 46% m= 48 g/s λ=2,03, circ. 0% m= 48 g/s (λ=1,47, circ. 0%, m= 33 g/s) sec+tert 345 oC sec+tert 558 oC Tf=1245 Tf=1173 Tf= 1224 oC Clever air jet direction a b1 b2
Comb. air preheating & flue gas recirculation Stirling-engine 9-10 kWe Pellet burner Vertical Furnace, fuel power 80 kW max Economisers Extract about 60 kW)
Co-operation • Technical Research centre of Finland • Helsinki University of Technology • Finnish industry (four companies) • International co-operation planned in a submitted EU proposal (ERA-NET)
Development of miniature electrostatic precipitator (ESP) for small scale combustion • Goal • To develop a miniature ESP for small scale combustion (< 200 kW thermal) capable to reduce particulate concentration in the flue gas by 80% • State of art: • High need in the markets • No commercial devices available • Prototype development in Austria, Norway and Switzerland since 2003 • Our version differs from those prototypes
Examples of results obtained so farParticle charging principle (TUT) Scheme of the collector (JYU)
Co-operation • Technical Research centre of Finland (VTT) • Tampere University of Technology (TUT) • Helsinki University of Technology (HUT) • Finnish industry (three companies) • A proposal has been submitted to extend this research (EU level)