Title: Stirling-aided heat and power (10 kW) production from wood pellets and planning a miniature ESP for small scale combustion
1Stirling-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
2Goal of research
- Demonstration of electricity production from wood
pellets in 10 kWe size in minimum of 15
efficiency (from fuel energy) without operational
problems
3Stirling-aided power productionState 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.
4Concept under development
Traditional pellet boiler
Water
5Example of CFD calculations Fuel power 60 kW
High landa (a) and fuel gas recirculation (b)
with equal mass flow of flue gas
?1,47, circ. 46 m 48 g/s
?2,03, circ. 0 m 48 g/s (?1,47, circ. 0, m
33 g/s)
sectert 558 oC
sectert 345 oC
Tf1245
Tf1173
Tf 1224 oC
Clever air jet direction
a
b1
b2
6Comb. air preheating flue gas recirculation
Stirling-engine 9-10 kWe
Pellet burner
Vertical Furnace, fuel power 80 kW max
Economisers Extract about 60 kW)
7Co-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)
8Development of miniature electrostatic
precipitator (ESP) for small scale combustion
- Goal
- To develop a miniature ESP for small scale
combustion (lt 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
9Examples of results obtained so farParticle
charging principle (TUT)
- Scheme of the collector (JYU)
10Co-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)