Air and Flue Gas Filters

One method is wet and dry scrubbing technology, and the other is electrostatic precipitator technology.

For our systems, we primarily use dry scrubbing technology.

For our dry scrubbing technology, we can offer ceramic filters and fabric filters.

For most of our furnaces, we prefer ceramic filters because they provide both very high filter efficiency and a very long service life.

Which of these two filter technologies is suitable mainly depends on the amount of flue gas and the media themselves.

Dry scrubbers are used to remove corrosive and toxic gases (such as SO2 and HCl) from flue gas. They are highly effective with low investment and operating costs.

The temperature range for the sorbent should be between 170°C and 300°C. Within this range, the sorbent can bind corrosive and toxic gases.

Flue gas mixed with the sorbent forms a layer on the outer surface of the filter and accumulates during operation.

The dust layer causes a pressure drop, and differential pressure measurement indicates necessary cleaning steps. When a certain differential pressure is reached, the filter is cleaned with compressed air using a counter-blow cleaning system, which cleans the filter with a jet pulse, causing the dust layer on the outer surface of the filter to fall down.

At the bottom of the filter, the ash is fed through a rotary valve into a big bag or ash container.

The insulation on the outside of the filter body protects it from corrosion during shutdown periods.

The dust inside is contaminated with sulfur and other components. If the temperature drops below the dew point, corrosion can occur.

Therefore, an additional standby heater is recommended to protect the housing from corrosion. This heater is optional, as its necessity depends on the local conditions.

The filter can be easily removed when necessary.

After training, the operating and service personnel can independently replace them.