INDUSTRIAL TYPE JET PULSE BAG FILTERS
Bag filters provide high collecting efficiency at an affordable cost. In such filters, the air is cleaned through long and cylindrical bags made from cotton or woolen cloth.
These filtering devices catch the particle polluters by passing from a special cloth filter. The most common example of this filtering device is a “bag nest”. This filter captures the dust in the air over several cloth layers. A dust coat is piled up slowly on the cloth. This, also, acts as a filter and increases the dust collection efficiency of the first system. Then, as a result of constant dust accumulation the cloth, it will be clogged. The dust is removed automatically by changing the cloth bag or shaking the bag.
Thus, the dust removed from the airflow stays in the bags. In these devices, the air is interrupted from time to time and bag filters are saved from the dust it kept via mechanic vibration or pressure air. By this, the marge amount of the dust is kept on the below cone.
The usage area of the bag filters is the same as the jet pulse cartridge filters. Industrial type jet pulse bag filters can be designed in two different ways.
• Industrial Type Jet Pulse Bag Filters
• Industrial Type Vibrating Engine Bag Filters
Places where a common cloth collection system is used comprise industrial foundries, grain processing, carrying and breaking of materials and grinding procedures.
Industrial Type Jet Pulse Bag Filters
• Capacity range: 5.000 – 200.000 m³/h
• Special design suitable for any business
• Release values below the Environmental Directive at the end of the filter
• Filter bags made out of cloths that are suitable for the load and chemical structure of the dust to be collected, and the humidity and temperature of the liquid
• Minimum pressure air waste thanks to the fully automated PLC Control unit and improved cleaning system
• Electro-galvanize coated, filter bag wire
• Need-based, explosion cover in each model
• Rigid system with entirely bolted assembly and placed on steel chassis
With the effect of the vacuum that is created by the fan at the end of the system, the dusty gases enter from the top part of the bunker (by means of the entrance shroud) passing through the pipes, and they get distributed to the bunker before arriving at the bags. The filtering is done inward from the outer layers of the bags. Simultaneously, the dust layer that is accumulated on the surface of the bag helps filtering.
Cleaned gases pass through the inner surface of the bag, fill the clean gas cell on the top part, and from there, pass through the clean gas outlet pipe and expelled from the fan chimney to the atmosphere (filtered clean air passes through the fan).
And the dust layer that is accumulated outside of the filter bags is cleaned with the help of the pressure air. As for the dust that spills out of the bags, they are expelled from the filter bottom bunker with the air-lock and the auger carrier, or collected in a bucket. The pressure air effect is supplied with short blasts on the filter bags during the cleaning process. This air blasts have two types of effects on the bag:
3. The vibration that the pressure air creates on the bag, and consequently the dust on the bag surface pouring out,
4. The pressure air that gets distributed into the inner surface of the bag blowing up the bag and thus, the air that is trying to get to the outer layer from the inner layer opening up the pores of the bag and expelling the dust.
The process of spraying the pressure air into the filter bags at short time intervals is ensured via an electronic timer. The timer durations can be adjusted as desired.
The flattening of the bags with the effect of the vacuum within (negative air pressure) is prevented with a cage. The assembly or replacement of the bags is done from the top, after opening the top cover of the filter.
Thanks to the automatic cleaning system, the maintenance and operation costs are low, and the filtering efficiency and the filter life is pretty high.
Jet pulse filters are usually used in central system dust and smoke suction practices. Dirty air collected from any polluting source is transferred to the filter via air ducts designed with suitable diameter and thickness. Generally, for dust, self-flanged round channels are preferred.
Particles carried by dirty air entered in the filter cabin’s inlet are captured with a flapper. The speed of air is reduced in this section and the desired filtering speed is achieved.
In addition, the sparks that might fall on the filter, large and abrasive parts are caught and directed in the collection bucket at the bottom. Thus, the life of filters is expanded. The dust that is collected is automatically cleaned thanks to the jet pulse cleaning system.
The sprayed air applies short-sudden pressure blasts on the inner surface of the bags. This pressure is obtained with venturis and the cleaning procedure is done. The cleaned air is sucked out of the cabin via an air centrifuge fan, and pumped into the desired environment. The dust moves inward from the outer surface of the filter. The filtered gases pass through the venturi and arrive at the clean chamber section, then to the outlet pipe.