Standard filter units
Survey
Variety
The standard filter program is designed as modular system and is based on five area size ranges, combined with four filter hose lengths. With this system filter units with fine graduated filter areas from 30 and 300 m² can be offered. This equates to an air quantity range of 3.000 up to 45.000 m³/h. By combination of individual units the total air quantity can be duplicated.
Variants
All filter units can be executed as overpressure- or low-pressure system (installation of the exhaust fan in front of or behind the filter unit). The cleaning of the filter hoses can be carried out by shaker motor or by compressed-air (jet-pulse).
By the combination of individual elements of the filter units different construction series are presentable:
- top filter unit,
- top filter unit with exhaust fan installed into the clean air chamber,
- container filter unit,
top filter unit with or without installed exhaust fan combined with a buffer container, - valve filter unit,
top filter unit with or without installed exhaust fan combinable with expansion hopper and installed rotary valve.
The mentioned variants can be equipped with an integrated injection chamber for direct connection to the exhaust pipework lines.
Advantages
- optimal adaptability to each requirement,
- high low-pressure stability,
- compact unit in particular with installed exhaust fan,
- low sound emission,
- very good price-performance-ratio by modular design,
- short assembly times by elements pre-assembled in our plant.
Applications
Application
Standard filter units are normally applied in the air quantity range between 3.000 and 45.000 m³/h.
Depending upon the application these units are designed as follows:
- top filter unit,
- container filter and
- valve filter unit.
Top filter units
In the wood branch top filter units are installed onto silos as central filter plant or serve as final separator in connection with an intermediate filter plant. The exhaust pipework lines and/or the transport lines end in the silo, this means that the chip/dust-mixture is directly injected into the silo.
These plants are generally executed as over-pressure plants (exhaust fans located on the raw air side), to avoid negative pressures in the silo.
As a special variant the top filter unit can also be supplied without weather-proof casing (installation filter). If so the filter is placed into the filter room of the silo.
Container filter
The most often applied variant is the combination of a top filter unit with a buffer container. Of course the container program is produced in the same sizes as the top filter unit program.
The container volume ranges from 1 up to 15 m³ depending upon the area size. According to the application different discharging systems (fan-wheel, screw and hinged bracket) can be used.
With installed exhaust fan (negative-pressure system) compact filter stations can be implemented to be applied as follows:
- Intermediate filter plant
The separated material is buffered in the container so that the transport plant to the silo is only taken into operation temporary. Arising material peaks are balanced. - Central filter plant
Underneath the buffer container a briquetting press is placed and the separated material is briquetted.
The briquetting press can also be installed indoors and be fed via a conveyor screw.
Valve filter
For the valve filters a top filter unit is combined with an expansion hopper and installed rotary valve. In this execution the filter plant can be installed onto a section steel frame with chip con-tainer installed underneath.
Alternatively the chip material discharged via the rotary valve can be blown into one or several chip containers and/or a silo by a transport plant.
Executions
Filter in modular design
The filter- and container program is executed as self-supporting construction, consisting of corner columns and edged, galvanised steel profiles being screwed to each other. By means of the modular design the complete filter program can be composed out of a few individual elements, so that the production of the individual parts can be carried out in larger quantities. In connection with modern production plants cost advantages result which is expressed by a very good price-performance ratio.
- Filter material / cleaning
Related to the application the optimal filter material regarding quality and surface treatment is chosen. The filter hoses can simply be assembled or disassembled by a special joining technique (snap ring).
Mechanically cleaned filters have a vibration frame mounted on elastic elements being made vibrate by a shaker motor and the filter cake inside the filter hoses is removed. The cleaning can only take place during production stops.
Compressed-air cleaned filters have filter hoses stabilized by supporting cages and charged from the outside. During the operation or during the production stops the filter hose is blown up with pulsed compressed-air and the outside adherent dust layer (filter cake) is removed.
The cleaning variants are characterized by the fact that both are carried out efficiently and gently, so that long filter durability is reached.
- Connection exhaust pipework
The filter units can either be equipped with an upstream injection duct or with an integrated injection chamber. The integrated injection chamber offers the advantage of a direct connection of the pipework systems (compact design) and an improvement of the flow conditions in the filter.
Preassembled filter plant
The individual elements of the filter units (filter, clean-air chamber, container, hopper) can be preassembled in our factory, so that these can be assembled and be connected to each other on the site by means of a crane.
