Online Pulse Jet Bag Filters
In an online bag filter, bags are cleaned row by row, even when the dust laden gas is filtered. The sequence of cleaning is controlled automatically by a sequence controller. This operates the assembly of solenoid and pulse valves which direct the air flow into the manifolds. The holes are jig drilled for perfect alignment with the venturi centre for achieving maximum cleaning efficiency.
Offline Pulse Jet Bag Filters
It incorporates the advantages of a pulse jet bag filter as well asthat of a reverse air baghouse. Each compartment is similar to an online pulse jet bag filter. The cleaning process consists of sequentially isolating each compartment and then cleaning the isolated compartment with compressed air. Offline cleaning is suitable for light and fine dust where occurrence of fluidization is a distinct possibility. Generally the Offline Bag Filter is employed for larger gas volumes
Some of the unique features incorporated are highlighted below:
Low pressure air cleaning system:
The Pulse Jet Bag Filter (PJBF) long bag design Incorporates a specialized low pressure cleaning system that offers following distinct advantages over conventional bag filters with high pressure cleaning system
- 1. Lower pressure drop across the unit.
- 2. Lower consumption of compressed air.
- 3. Longer filter bag life.
- 4. Lower noise levels during operation.
The low pressure cleaning system uses a special immersion type header mounted pulse valve
.- 1. This cleaning system is so effective that it achieves 25% more cleaning pressure on the bag.
- 2. The impulse is built in half the time it takes conventional system.
- 3. Effectively flushes the bag & reduces re-deposition of fine dust. .
- 4. Can clean bags up to 10 meters length. +Cleans the internal of the filter media to have lower longer term pressure drops.
- The filter media is not flexed as extensively as in the conventional cleaning, thereby increasing media life.
Unique gas flow path:
Our filters are specially designed for high inlet dust loads. The gases enter the filter casing entry plenum behind a baffle and are directed upwards by this specially designed baffle. The 90 degree turn that the gases take on entry helps in separating a lot of dust.
This reduces the dust load on bags. The unique gas flow path makes the gases enter the filter with an upward bias on the velocity. This upward bias reduces impact of the dust particles on bag surface enhancing the life of the bags.
Wider pitch of bags:
The bag pitch - the centre to centre distance between the bags - plays a very important role in the performance of the bagfilter. In order to address the high gas flows and very high dust loads involved the our filters has adopted an increased spacing between bags - as much as 36%. This additional clear space allows the high amount of dust load to fall by reducing gas velocity between bags. This also reduces the sliding friction at bags enhancing the life of the bags.maximum cleaning efficiency.
Bag / Cage / Venturi Arrangement:
Cages are wire frames placed inside pulse jet filter elements to provide support to the fabric as flexing occurs during filtration and cleaning cycles. Configuration of a frame generally follows the shape of the filter elements, i.e., circular, oval, flat or starshaped. Cages for long filter elements are made in sections which snap together for easier handling. Wearpoints on filter bags may develop at the horizontal supports. Cage designs to reduce these points increase the number of vertical wires and reduce the horizontal supports. Protective coatings on cages can extend the life of the cage and the bag. Coatings such as vinyl, epoxy, zinc, and Teflon® may be used.