Thanks ot their compact design and lateral filter bag arrangement on the pre-filter/ separator the systems are suitable for many different factory areas. Large building headrooms are not required since all the service work and filter bag exchanges can be done from a lateral service platform.

Installation of an insulated electric heating device allows to use ZSA even for outdoor applications.

ZSa is a central vacuum station. With its stationary suction pipe network it can be used either as a vacuum station for bulk materials or as a cleaning system. ZSA have been designed to convey any kind of bulk materials or dust provivided such material is not combustible and/ or explosive. To exhaust combustible and explosive bulk material (e.g. coal dust), ZSA with integrated explosion protection devices are used (see fig.). ZSA mainly consists of a compact and sound-insulated vacuum blower station and a pre-filter with discharge flap and FIBC filling socket mounted in a steel frame structure with a step-on platform. When the system is used for cleanine jobs (e.g. in refuse incinerators) the blower station is equipped with a downstream suspended particle filter to ensure the maximum admissible feedthrough rate of 0.005 to 0.05% (BIA category K1/ K2) allowing cleaning applications in the field of thermal wast treatment.

The ZSA can be operated by just one person resp. by as many persons as are working on the suction points. The ZSA shown here allows to operate 4 suction points DN 50 simultaneously, with a conveying capacity of 250 kg/ h per suction point. The system is controlled by a PLC and all the operating modes are indicated by light indicators and a display.

The system can be used for direct filling into FIBCs, with no need for additional bulk handling stations. The FIBC filling spout is directly fastened to the connecting socket below the discharge flap, assuring a dust-free filling process. FIBCs are connected by a pneumatically inflatable clamp allowing one-hand operation thanks to a quick closing device. Additional sysetm/ pre-filter components: - pneumatic annular clearance fluidization for a   smooth material flow out of the seperator level   indicator for MAX filling level detection within   the separator   ultrasonic sonar for MAX filling level detection   within the FIBC, mounted in the filling socket

Vacuum blower station:

The vacuum blower station generates the underpressure required in the pipe line system. A rotary piston blower driven by a three-phase motor via a V-belt drive serves as a compressor. Furthermore the unit is entirely integrated into a sound-absorbing cabin. On the suction side the rotary piston blower is equipped with an upstream safety filter reliably preventing any dust penetration (in case the pre-filter is defective). The sound-absorbing cabin is cooled by a fan impeller mounted on the blower shaft. The rotary piston blower is provided with a starting relief that closes automatically after the system has been started up. Furthermore, cooling air is automatically applied to the system in case the admissible blower temperature is exceeded. The blower station operating modes are constantly monitored and indicated.

Preliminary filter/ separator:

The preliminary filter separates the material contained in the conveying air and also cleans the conveying air. The dust-laden air flows into the filter chamber where the fine dust deposits at the outer walls of filter elements. The air flows through the filter elements and the raw gas is lead off into the clean air chamber and flows to the rotary piston blower via the air outlet socket.

The filter cleaning is actuated by solenoid valves mounted to the compressed air tank clean air chamber. The control sends a signal to one of the valves which in turn initiates cleaning of the pertaining filter elementy by a short and powerful pressurized air. After a pre-set period of time has elapsed the control generates a signal to the next valve which cleans the respective filter element.

The degree of contamination of the filter is controlled by a differential pressure monitoring device which generates a fault indication whenever the max. admissible value is exceeded.

Central dust exhausting plants ZSA are mainly used in the following industrial branches:

        - refuse heat and power stations
        - refuse incinerators
        - power stations
        - cement works
        - foundries 

Technical data of the system shown here:

place of installation: type:  operating pressure of separator: operating temperature of separator: explosion protection: operating voltage: control voltage: aspiration airflow rate: engine output: superfine filter degree of separation: filter cleaning:

refuse incinerator ZSA 0.5 bar abs. max. 50 °C ECO-Q quench system bursting disc monitoring central control extinguishing agent tank, capacity 5 , serving a flame arrester towards the pipe line network 400 V/ 50 Hz 24 V DC  30 m³/ min. 37 kW  99.98% electropneumatic