NHA Norbert Heinrich Automation

The requirements of today's dust collectors are:

• Process safety
• Economic efficiency
• Energy efficiency

NHA supports for these aspects:

• Way of control
• Compressed air consumption
• Life cycles of dust collector elements
• Dust monitoring

The optimization happens via the electrical control and the mechanism for generating an air blast with very steep rising edge for optimal cleaning of the filter.

In addition, sometimes special solutions are required for special dust collectors (flap control for influencing air currents, air flow control, monitoring and data transmission of filter system parameters, special discharge devices, etc.)

Pneumatic impactors type MCTAG have following features

• Extreme high life time (> 1 million cycles)
• Adjustable punch through pressure reducer (0.5 bar to max. 2 or 3 bar)
• Operating with oil-free or dry compressed air
• Stainless steel housing, without friction bedded flying piston
• Prevents damage to holders and containers
• 3 sizes (maximum impact strength 12 kg, 30 kg, 50 kg)
• In addition to electrical control also pneumatic control is possible
• Alternatively powerful impactor (maximum impact force 60 kg) with any installation position

The requirements of a diaphragm valve i.e. filter valve are:

• Steep rising edge and large air flow rate for efficient compressed air shock and therefore optimal cleaning of the filter element
• Fast closing for low compressed air consumption
• High life cycles for nearly maintenance-free operation.

RECO filter valves meet these requirements with power-reflex diaphragm, a polymer diaphragm with "Crisp-frog effect". The housing is made of aluminum. The diaphragm valves are both with integrated pilot solenoid valve (24V DC or 230V AC) as well as externally controlled (external pilot valve) available. Commonly used port size G 1.

RECO filter controls are the most reliable filter controls for the operation of diaphragm valves (filter valves) in jet dust collectors. Depending on the size of the dust collectors and number of filter valves stand-alone-systems or modular systems are used. Depending on the diaphragm valve or filter valve, with solenoid or external control, there are the devices without or with built-in pilot valves. In addition to the simple initial operation and the operator guidance, there are controllers with integrated differential pressure transmitters and controllers for the pollution-specific cleaning of the filter elements. For the further process and cost optimization of dust collectors there are controls:

• Tank pressure control to reduce the consumption of compressed air and extending the lifetime of filter elements
• As an alternative to ΔPmax / turn on and ΔPmin / switch off mode the change of the pause period as a function of the differential pressure is possible.
• Dust monitoring, i.e. broken filter elements are no longer controlled, in order to keep the dust concentration low in the clean gas flow.

RECO tank systems with integrated filter valves offer a considerable simplification in the assembly of filter equipment and an even more effective pressure air blast. The tank is based on an aluminum frame and is built according to pressure equipment directive 2014/68/EU. Advantages are:

• Stronger compressed air pulse compared to single valve solutions due to low flow resistance
• Distance valve to valve ≥ 55 mm
• Compact design
• Ease mounting of filter controls or valve boxes
• Easy mounting by means of connection and connection components (push-in fittings for blow pipes which fasten the tank to the filter housing or compression fittings connect the tank to welded blow pipes)

There are the tank systems with diaphragm valves (filter valves) of size DN 25, DN 40 and DN 50. The valves of nominal diameters DN 40 and DN 50 are pilot double operated. Diaphragm valves can be either equipped with integrated solenoid pilot valves or with connection G 1/8 or push-fit for the connection of an external pilot valve.