Days of Combustion 2004

1
Concept and First Operational Experiences of
aDirectly Wood Particle Fired Gas Turbine
Franz Wingelhofer Institute of Thermal
Powerplants Vienna University of
Technology Vienna, Austria
2
Overview

• state of the art
• concept of directly wood particle fired gas
  turbine
• emissions CO, CnHm, NOx
• conclusions

3
State of the Art

• mostly by means of steam power plants
• (10 MWel 20 MWtherm, 30 )
• allotherm gasification and operation of gas
  engine
• (2 MWel 4.5 MWtherm, 25 )

4
Powerplant Size

• (fuel) costs prop.
• earnings prop. or
• degressive

optimal powerplant size!
5
Directly Wood Particle FiredGas Turbine

• existing gas turbine
• combustion chamber
• ash separator
• fuel feeding system

cost effective!
6
Requirements Concept

• main grid isolation small volumes
• solid fuels long residence times
  mixing
• formation of NOx two-stage combustion
• autothermal gasification
• complete combustion

cyclone post combustion chamber
7
Combustion Chamber of the Institute

• pressure vessel ? 600 mm x 1 750 mm
• thermal input 200 700 kW
• operating pressure up to 3 bar
• spec. heat release rate 3.0 4.6 MW/m3
• ash separator axial cyclone

8
SectionalDrawing
9
Airflows
hot gas
tertiary air
secondary air
primary air
wood particles conveying air
10
KHD T216
11
PneumaticFuel Feeding System
sending bin with stirring device
sending bin with stirring device
screw conveyor
screw conveyor
vibration conveyor
vibration conveyor
conveying pipe
secondary air
primary air
injector
injector
12
CO Emissions
13
CnHm Emissions
14
NOx Emissions
15
Conclusions

• cost effective powerplant
• complete combustion and low NOx emissions by
• two stage combustion chamber
• appropriate adjusting of air mass flows
• reliable operation of expander due to ash
  separator