Automatic monitoring of valve and filter functions
Especially large filter plants with several hundred cleaning valves and many thousands of filter bags, such as those found in waste incineration plants and cement works, should have a high degree of automated monitoring processes to ensure that the plant is always fully functional.
For this reason, HESCH has integrated automatic hose rupture monitoring into the HE 5750 cleaning control system in addition to extensive monitoring of the cleaning valve function. For this purpose, only one central dust sensor is optionally required, which mounted in the clean gas duct at the filter outlet, monitors the dust load of all chambers.
When using a 500 kW fan, for example, operators of dust collection systems can reduce electricity consumption by around 10 percent, saving around 22,000 euros in energy costs per year. (At a kilowatt price of 5 cents.)
Pre-pressure control: new feature enables energy costs to be reduced
Saving energy is even more important today than ever before, due to recent high electricity price increases. HESCH has developed an energy-saving function for operators of large filter systems.
The new inlet pressure control optimizes the cleaning pressure. The inlet pressure control ensures that only as much compressed air is delivered as is required for cleaning the filter. The consumption of expensive compressed air is reduced. In addition, the upstream pressure control also has a positive effect on the service life of the filter media, since the filter elements are subjected to compressed air more gently than before. This lower load increases the service life of the filter elements.
Accurate hose rupture localization
If one of three freely defined limit values of the dust load is exceeded, the control system automatically assigns this event to the respective chamber and triggers the corresponding reaction (e.g. an error message, an alarm or the shutdown of the system).
In this way, not only is fault-free operation guaranteed at all times, but in the event of a hose rupture, immediately a message is also generated with the exact position of the damaged hose row.
This considerably minimizes the time required to locate a defective filter bag and thus increases the availability and efficiency of the system.
Structure of the cleaning system
The HE 5750 system controller is the central unit in the CAN network of the cleaning control system for industrial bag filters. The central control unit communicates with the decentralized valve control units HE 5724 as well as the damper control units HE 5740 via the industrial CAN bus.
The HE 5750 central control unit takes over the task of coordinating and monitoring all connected assemblies and communicating with the control system.
The HE 5724 slave controllers control the valve control and monitoring process. The damper control units form the interface to the damper actuators.
The HE 5750 controls up to 32 slave boxes. The connection between the functional units is made via CAN bus.
A connection to a control system via Profibus-DP, Modbus or Ethernet is standard.