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Coal System

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Coal System

Combustion optimization

Coal G3

Online measurement of the coal mass flow between the mill and the burner Real time!

Example Pipe Arrangement

Receiver

Transmitter

A

w

o

l

f

s

s

a

m

In case of roping:

cover full

cross section

Easy installation:

The sensors are mounted through easy drill and tap holes (14x1 mm)

MECONTROLCoalMeasurement 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.

Signal Sensor 1

Coal Dust Pipe

“Signature”

Signal Sensor 2

Sensor 2

Sensor 1

X(t)

Y(t)=X(t-T)

S=const.

T=-26 ms

Optimum of

correlation

“Correlation”

correlation

Time T

Example

S=54 cm

T=26 ms

w=20,8 m/s (average velocity of the particles !)

Velocity

W=S/T

Measurement Cabinet

Microwave Board D-HF

Amplifier

VCO

MW-Output

Time basis

Processor

MW-Input

Data output

Power input

Temp.input

RS 232

MECONTROL Coal Measurement Cabinet

G3-Sensor

Temperature

measurement sensor

NEW MECONTROL COAL G3 System

1 h high time resulution plot of

mass flow and velocity

Mill shut down sequence over 4:40 h time window

Derived mill parameters

t1 t2

Mill response time can be derived,

Impact on load changes,

Indication for mill wear and coal

grindability

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

MECONTROL Coal

Velocity

Velocity is measured using a cross correlation technique (picture: pipes 1 through 8). Measurement range:

5 m/sec to 50m/sec

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

MECONTROL Coal

Combustion optimization by Secondary air control

without control active control

we focus on your process

O2

NOx

CO

MECONTROL boiler optimization with secondary air control using MECONTROLCoal

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

Variable Orifices

Example Pipe Arrangement

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

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, LG&E, NSP, Mission Energy, TVA, Alliant Energy, Dynegy, Consumers Power, First Energy, Santee Cooper, SCE&G, Xcel Energy