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Functional description
3
Functional description
Precipitator function
The draught fan sucks the boiler flue gas through the
precipitator. It is deflected at its bottom and sucked
between the inner wall and the electrode to the flue gas
connection by the electrical field.
Fig. 3-1: Exhaust path
Inside the precipitator is the vertically oriented
"discharge electrode," which is connected to the
high voltage unit. The flue gas is cleaned as it flows
through the electrical field. In the electrical field (up to
30 kV voltage), the discharge electrode "pushes"
the dust particles from the flue gas to the inner wall of
the precipitator. The dust particles accumulate there
and the flue gas is cleaned as a result. Small quantities
of dust will remain adhered to the electrode. Therefore,
it is cleaned in regular intervals.
Fig. 3-2: Cleaning the discharge electrode
1
Striking weight
2
Shaft with gear
3
Electrode
Deposits on the inner walls are removed by a sliding
rake which moves up and down. The sliding rake
operates at the same time as the de-ashing of the
boiler. The ash is transported on the bottom to the ash
box by an ash screw.
Fig. 3-3: Precipitator de-ashing
1
Sliding rake
2
Lever shaft for the sliding rake
3
Ash screw
Summary of Contents for EEP 130
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