Verbundforschungsprojekt ADECOS

Pulverised Fuel Combustion Test Facility

Short description

Combustion Test Facility of TU Dresden

Combustion test facility with indirect firing system for pulverised fuels
Top-fired, cylindrical combustion chamber composed from 5 individual segments with air-cooled, refractory-lined walls
Operation in conventional air-fired mode / combustion with pure oxygen ('oxyfuel')
Flue gas recycle can provide realistic oxyfuel conditions at the burner
Fuel transport to the burner using air and/or recycled flue gas
Different burner types can easily be installed (jet burner, various swirl burners), burners optimised using CFD
Additional gas-fired burner for start-up and/or combustion support
Large number of inspection ports allow for detailed in-flame measurements using standard probes
State-of-the-art plant control system with graphical user interface and continous recording of plant data and flue gas composition

Datasheet

Thermal input:	50...60 kW_th
Combustion chamber dimensions:	inner diameter 0.29 m, length 2.50 m
Fuel flow (lignite, 10% moisture):	6...12 kg/h
Oxygen feed rate:	0...20 kg/h
Flue gas recycle:	20...120 kg/h
Air/recycle gas temperature:	100...400 °C
Flue gas exit temperatures:	550...750 °C (end of combustion chamber) 150...250 °C (after flue gas cooler)

Process flow diagram

Flow Chart of Pulverised Fuel Combustion Test Facility at TU Dresden

Process flow diagram of the Pulverised Fuel Combustion Test Facility at TU Dresden

Plant components	Streams
1: Fuel storage and volumetric metering	9: Primary Air
2: Combustion chamber with burner on top	10: Primary recycle gas
3: Flue gas cooler (non-condensing)	11: Primary oxygen
4: Ash filter	12: Secondary Air
5: ID fan	13: Secondary recycle gas
6: FD fan	14: Secondary oxygen
7: Recycle gas fan	15: NG burner fuel and air supply system
8: Air/recycle gas electric heaters	16: Filter purge gas (Air/CO₂, periodically)

Operation and measurements

Flue gas analysis devices

Plant control and data recording

The plant is equipped with a number of temperature sensors in the air and flue gas paths.
Flue gas composition at the end of the combustion chamber (O₂, CO, CO₂, SO₂ and NO) is recorded continuously.
Volume flows are automatically controlled which allows for very stable operating points.

Graphical user interface

In-flame measurement

Standard suction probes are available for in-flame measurement of temperature and gas composition through 26 port openings in the combustions chamber. Thus, axial and radial profiles can be compiled from the the measured data. The access ports are specially sealed so insertion, use and removal of probes does not cause air ingress which is important under oxyfuel conditions.

Cooled suction pyrometer for flue gas sampling

VDI standard cooled suction pyrometer

Special ceramic probes for quantitative sampling of ash deposition are also available.

Ash deposit probe

Laboratory analysis

Analysis of fuels, slag and ash is performed in our Fuel Technology Laboratory, e.g.

Heating value
Chemical composition
Fuel moisture
Unburned carbon content
Ash melting behavior using a Leitz microscope