Filter systems and flue gas cleaning
Our filter units are of modular design.
Several modules can thus form a filter system.
By default, these are made up of 1-2-3 and 4 modules and so on.
There are two ways to filter the exhaust gas.
On the one hand there is the wet and dry washing technology and on the other hand the electrostatic filter technology.
For our systems we mainly use the dry washing technology.
For our dry washing technology we can offer ceramic filters and fabric filters.
We prefer ceramic filters for the most of our furnaces, as these have a very high filter efficiency on the one hand and a very long service life on the other.
Which of these both filter technologies is suitable is mainly a question of the amount of exhaust gas and the media itself.
Dry scrubbing systems are used to remove corrosive and toxic gases (for example SO2 and HCl) from the exhaust gas.
They are very effective with low investment and operating costs.
The temperature range for the dry-scrubbing solvent should be from 170°C up to 300°C.
In this range the dry-scrubbing solvent can transfer the contents.
Flue gas mixed with dry-scrubbing solvent create a layer on outside surface of the filter and accumulate during operation.
The dust layer causes a pressure drop and a differential pressure measurement indicate necessary cleaning steps.
At a certain differential pressure level the filter will be cleaned by pressure air with a reverse jet cleaning system which clean the filter by a jet impulse and the dust layer on the outside surface of the filter will fall down.
At the bottom of the filter the ash feed by a rotary valve to a big bag or ash container.
Therfor a standstill heater is additionally recommended to protect the housing from corrosion.
This heater is only an option, because if it is necessary depends allways only on local conditions.
Easy replacement of the filter cartridges
The filter can easily removed when necessary.
It can be replaced by operation staff after training.