Combustion optimization

1
Coal System

• Combustion optimization
• Coal G3
• Online measurement of the coal mass flow between
  the mill and the burner Real time!

2
Example Pipe Arrangement
3
MECONTROL Coal Measurement Principle density

• Microwave measurement
• 2 sensors in one pipe are used to measure the
  coal concentration over the FULL cross sectional
  area of the pipe.

4
MECONTROL CoalMeasurement Principle velocity
Velocity WS/T
5
MECONTROL Coal Measurement Cabinet
6
MECONTROL Coal Sensor installation
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NEW MECONTROL COAL G3 System
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1 h high time resulution plot of mass flow and
velocity
9
Mill shut down sequence over 440 h time window
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Derived mill parameters
t1 t2
Mill response time can be derived, Impact on load
changes, Indication for mill wear and coal
grindability
11
Mill Quality monitoring Low standard deviation
of concentrations and velocities
Variation of velocity 1s 0.7 m/s (2.1 ft/sec)
Variation of coal loading 1s 50 g/m
12
MECONTROL Coal

• Velocity
• Velocity is measured using a cross correlation
  technique (picture pipes 1 through 8).
  Measurement range
•  
•  
• 5 m/sec to 50m/sec

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MECONTROL Coal

• Absolute mass flow
•  
• Out of the independent measurement values,
  density and velocity, the absolute mass flow is
  calculated without using any feeder signal.
• Measurement range
• 10 g/sec to 20 kg/sec

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Combustion optimization by Secondary air control
MECONTROL Coal

• without control active
  control

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MECONTROL boiler optimization
with secondary air control using MECONTROL
Coal
16
Air-to-Fuel Ratio
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Burner Air Register Settings
Air Register Settings
50-20-20-20-20-20-20-50 O2 setpoint 3.1
50-20-20-20-20-30-50-80 O2 setpoint 3.1
50-20-20-20-20-20-50-80 O2 setpoint 3.1
50-20-20-20-20-20-50-80 O2 setpoint 2.5
50-20-20-20-20-20-50-80 O2 setpoint 2.2
50-20-20-20-20-30-50-80 O2 setpoint 2.2
Right boiler sidewall
Left boiler sidewall
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Variable Orifices
Example Pipe Arrangement
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Damper Location on the Top of the Classifier
Damper, one sided direction against flow
rotation
Damper as close as possible on the top of the
classifier
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MECONTROL Coal References

• Since 1998 in total ca. 600 Measurement
  Installations at 45 Plants worldwide
• Countries Germany, USA, Japan, Turkey,
  Denmark
• Customers E.ON, Mainova, SaarEnergie,
  STEAG, EnBW, J-Power, AEP, Allegheny Energy,
  LGE, NSP, Mission Energy, TVA, Alliant
  Energy, Dynegy, Consumers Power, First
  Energy, Santee Cooper, SCEG, Xcel Energy