Mounted atop a storage tank, the Automatic Bin Vent filters the exhaust air and literally allows the tank to breathe.
When material is conveyed to the storage tank, the increased volume within the tank reduces the air stream velocity, the material drops, and the excess air is vented through the filter. During the venting process, airborne dust particles are trapped by the filter bags.
Sequentially timed bursts of compressed air controlled by solenoid valves, pulse the bags and dislodge the dust particles. All of the product remains in the storage tank and clean air exhausts through the tank vent into the atmosphere.
The bin vent is constructed of epoxy-coated carbon steel.
For applications requiring it, the material contact surfaces or the entire unit can be constructed of 316 or 304 stainless steel. Stainless steel construction is an excellent choice for abrasive, corrosive, and foodgrade applications.
The bin vent’s filter bags are easily accessed for service through the quick-access door. Latches unscrew by hand and swing to the side, allowing the door to open on left-hand hinges. The filter bags and cages can be reached through the door for removal, cleaning and eventual replacement.
The filter bags are cleaned by bursts of compressed air from the air accumulator. The air is directed through venturis, forcing a greater volume to join the burst before it enters the bags for more complete dust particle dislodging. Only a single row of bags is pulsed at a time, leaving the remaining filter bags on-line. The interval between bag pulsing is adjustable to provide the best bag cleaning.
The air pulse cleaning of the filter bags is regulated by the control panel. The panel’s timer board allows easy adjustment of the frequency and duration of each pulse, as well as displaying which row of bags is currently being cleaned. All of the solenoids which fire the pulses on command from the timer board are located in the NEMA 4 (standard) panel. Explosion-proof NEMA 9 construction is optional. The panel is positioned within easy reach to simplify maintenance
Pressure differential gauge
Each receiver is equipped with a pressure differential gauge. The gauge measures the difference in pressure between the bag plenum and venturi housing, informing the operator of the effectiveness of the filter cleaning system.
Each bin vent can be equipped with an exhaust fan. The fan overcomes the pressure differential across the filter bags, ensuring that pressure does not build up inside the tank. This is of particular importance when the bin vent is mounted on a tank equipped with a pressure/vacuum (PV) valve, since the path of least resistance for the unfiltered air is otherwise through the PV valve.
As an alternative to the exhaust fan, a weather hood can be used on the bin vent to prevent precipitation from entering the exhaust port.
The safety grid prevents bags and cages from falling into the bin or storage tank.
A ladder is available for bin vents to facilitate the inspection of the exhaust fan.
Bin vent hoppers are offered with a choice of material inlet and discharge sizes. Outlet flanges can be made to match Premier Aerolocks™ or other manufacturers’ equipment, allowing the unit to be easily incorporated into a new or existing system.