ECOMAK Systems

Mulshi, Pune, Maharashtra

In a Reverse Pulse Jet baghouse or simple known as pulse jet baghouse, bags are supported by a metal cage, which is fastened onto a laser cut tubesheet plate at the top of the baghouse. Dirty gas enters from the bottom of the baghouse and flows from outside to inside the bags. The metal cage prevents collapse of the bag. This filters the dirty gas which captures the dusty gas particles on the outer surface of the bags.

Bags are cleaned by a short burst of compressed air injected through a common air manifold over a row of bags. The compressed air is accelerated by a venturi nozzle mounted at the reverse-jet baghouse top of the bag. Since the duration of the compressed-air burst is short (generally, less than 0.1seconds), it acts as a rapidly moving air bubble, traveling through the entire length of the bag and causing the bag surfaces to flex. This flexing of the bags breaks the dust cake, and the dislodged dust falls into a collection hopper below.

Pulse Reverse-jet dust collectors can be operated continuously and cleaned without interruption of flow because the burst of compressed air is very small compared with the total volume of dusty air through the collector. The short cleaning cycle of reverse-jet collectors reduces recirculation and redeposit of dust. This cleaning system works with the help of sequential timer or PLC based panel attached to the fabric filter. This timer indicates the solenoid valve to inject air to the blow pipe.

Online baghouse systems are used in applications such as- Industrial Boiler Exhaust flue gas, material handling systems, capturing nuisance dust in plants amongst a few of the many applications.

ECOMAK have supplied online pulse-jet baghouses with volumes ranging upto 1, 00, 000 Am³/hr and more for a wide variety of applications ranging from milk powder to uranium ore.

In an offline pulse jet baghouse, the construction and working is similar as the online baghouse. The offline Pulse jet Baghouse consists of a number of modules/chambers. Each module is isolated from gas stream by closing its outlet poppet damper in predetermined sequence. In an isolated module, each of filter bag rows is cleaned sequentially by compressed air pulses. The mass of air also draws air behind it, adding to the downward airflow.

The dust removed falls into the hoppers and is discharged through discharge valve. A master controller - which can be PLC (Programmable logic Controller) based dictates the sequence of the chambers that should be go in "Offline Mode."

Offline baghouse systems are generally suitable for large volumes or applications which have light dust. These baghouse systems are robust and sturdy. One of the main advantages of the offline baghouse system is that the maintenance of the system can be done by "switching off" one module till the time the maintenance activity is complete.

Offline baghouse systems are used in steel, cement and power applications where the gas volumes are huge.

ECOMAK Offline pulse-jet baghouse technology caters to various sectors of the industry. Offline Pulse-jet baghouse is used for PRIMARY and SECONDARY Ventilation applications.

A safety dilution damper is provided to safe guard the fabric media before the bag house for temperature rise. This damper will be normally closed during normal operation. However it will be open at predetermined set point from the temperature detector located before the bag house. Fresh air will be introduced from the atmosphere and keep the temperature of gases well below the limit. Once the designed system temperature is attained, again at predetermined set point the damper will be closed automatically.

As we are proposing a common bagfilter and fan for two melting systems with different volumes, temperatures and pressure drops (due to difference in the equipment in each system) the air will tend to pass through the system which offers lesser resistance. To balance the drafts ensuring adequate flow and fumes as per predetermined quantities a damper will be provided which will regulate the pressure across the two systems balancing these to designed volumes and pressure.

A bypass damper is provided to safe guard the fabric media before the bag house if the temperature rises beyond design limit. This damper will be normally closed during normal operation. However it will be open at predetermined set point from the temperature detector located before the bag house. This will bypass the fumes/gas from the baghouse to the fan which will result in safeguarding the baghouse.

ECOMAK offers 3-way dampers, Lourve-dampers, guillotine dampers and V-I-V Dampers for the applications stated above.