Advanced

Development of a Wood Powder Fuelled 35 kW Stirling CHP Unit

Pålsson, Magnus LU and Carlsen, Henrik (2003) In Proceedings of the 11th ISEC (International Stirling Engine Conference) p.221-230
Abstract
For biomass fuelled CHP in sizes below 100 kW, Stirling engines are the only feasible alternative today. Using wood powder as fuel, the Stirling engine can be heated directly by the flame like when using a gaseous or liquid fuel burner. However, the combustion chamber will have to be much larger due to the slow burning of the fuel. To avoid sintering of ash the flame temperature in a biomass burner has to be quite low. The flame temperature can be lowered by using a high excess air rate; however this will lower system efficiency and needs a large air preheater. By using combustion gas recirculation (CGR) a smaller air preheater can be used, while system efficiency will increase compared with using excess air for flame cooling.

... (More)
For biomass fuelled CHP in sizes below 100 kW, Stirling engines are the only feasible alternative today. Using wood powder as fuel, the Stirling engine can be heated directly by the flame like when using a gaseous or liquid fuel burner. However, the combustion chamber will have to be much larger due to the slow burning of the fuel. To avoid sintering of ash the flame temperature in a biomass burner has to be quite low. The flame temperature can be lowered by using a high excess air rate; however this will lower system efficiency and needs a large air preheater. By using combustion gas recirculation (CGR) a smaller air preheater can be used, while system efficiency will increase compared with using excess air for flame cooling.



In a three-year project, a wood powder fuelled Stirling engine CHP unit will be developed and run in field test. The project will use the double-acting four-cylinder Stirling engine SM3D with an electric output of 35 kW. This engine is a further development of the engine SM3B that has been developed at the Technical University of Denmark. The engine heater is being adapted for use with wood powder as fuel. During a two-year period a combustion system for this engine, using wood powder as fuel will be developed at Lund University, Sweden, in cooperation with the Technical University of Denmark and with the wood powder boiler manufacturer VTS AB.



The unit is to be run in CHP operation by Vattenfall - the largest electric power company in Sweden - in a one-year field test in Älvkarleby, Sweden, and the operation of the unit will be evaluated at the end of the field test period.



The unit is intended for blocks of flats, schools, local heat production plants and the wood industry. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
stirling engine renewable energy micro-chp power generation wood powder burner
in
Proceedings of the 11th ISEC (International Stirling Engine Conference)
pages
221 - 230
publisher
Department of Mechanical and Aeronautical Engineering, University of Rome "La Sapienza"
language
English
LU publication?
yes
id
a78d80a5-8039-46db-a6c6-b26cb15da9c5 (old id 538356)
date added to LUP
2007-09-24 14:27:18
date last changed
2016-04-16 07:59:42
@misc{a78d80a5-8039-46db-a6c6-b26cb15da9c5,
  abstract     = {For biomass fuelled CHP in sizes below 100 kW, Stirling engines are the only feasible alternative today. Using wood powder as fuel, the Stirling engine can be heated directly by the flame like when using a gaseous or liquid fuel burner. However, the combustion chamber will have to be much larger due to the slow burning of the fuel. To avoid sintering of ash the flame temperature in a biomass burner has to be quite low. The flame temperature can be lowered by using a high excess air rate; however this will lower system efficiency and needs a large air preheater. By using combustion gas recirculation (CGR) a smaller air preheater can be used, while system efficiency will increase compared with using excess air for flame cooling.<br/><br>
<br/><br>
In a three-year project, a wood powder fuelled Stirling engine CHP unit will be developed and run in field test. The project will use the double-acting four-cylinder Stirling engine SM3D with an electric output of 35 kW. This engine is a further development of the engine SM3B that has been developed at the Technical University of Denmark. The engine heater is being adapted for use with wood powder as fuel. During a two-year period a combustion system for this engine, using wood powder as fuel will be developed at Lund University, Sweden, in cooperation with the Technical University of Denmark and with the wood powder boiler manufacturer VTS AB.<br/><br>
<br/><br>
The unit is to be run in CHP operation by Vattenfall - the largest electric power company in Sweden - in a one-year field test in Älvkarleby, Sweden, and the operation of the unit will be evaluated at the end of the field test period.<br/><br>
<br/><br>
The unit is intended for blocks of flats, schools, local heat production plants and the wood industry.},
  author       = {Pålsson, Magnus and Carlsen, Henrik},
  keyword      = {stirling engine renewable energy micro-chp power generation wood powder burner},
  language     = {eng},
  pages        = {221--230},
  publisher    = {ARRAY(0x9989148)},
  series       = {Proceedings of the 11th ISEC (International Stirling Engine Conference)},
  title        = {Development of a Wood Powder Fuelled 35 kW Stirling CHP Unit},
  year         = {2003},
}