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Air Pollution Control Equipment
As we all know, the air pollution norms are getting stricter with every day passing by. So it becomes quite obvious to install and commission an air pollution control equipment.
One such air pollution control equipment is the Bag Filter. Bag Filter helps in separating the particulate matter from the flue gas coming out of the Steam Boiler.
The most common type of Bag Filter is Pulse jet type.
Pulse Jet Bag Filter & Its Operation
Bag filter comprises an arrangement of Bags, made up of special fabric, capable of bearing the operating temperature of up to 220 degree Celsius.
These bags are long, vertically fit upon a ring-like structure. This structure provides rigidity to the bags when inserted inside them, now every bag is arranged vertically in row/column fashion.
The design of Bag Filter heavily relies on the Air to Cloth Ratio as per the composition (type of fuel used) and the flow of flue gases. It is installed such its outlet is the id fan flue gas inlet.
Flue gas coming out of the Boiler, traveling through the duct, enters the casing of the bag filter, so because of suction created by the ID Fan, the flue gases come in contact with the bags and enters the hollow portion because of pressure gradients.
During this, the heavy particles get collected on the bag’s external surface because of its impermeability to them. The filtered flue gases then enter a separate chamber from the bag’s outlet and get supplied to id fan inlet and then to chimney to be released into the atmosphere.
With time, the dust content on the bag’s surface goes above the desired level, in that case, the pulse jet system comes in action by supplying pressurized air.
This air enters the bags through its flue gas outlet and shakes up the bag, so the dust is at rest gets separated from the bags (basic inertia concept) and gets collected at the bottom of the equipment.
The frequency of this pulse jet cleaning depends upon the dust percentage in the flue gas.
We at Thermodyne Boilers, have supplied and commissioned Bag filter to many of our clients successfully.
Benefits of Air Pollution Control Equipment
- Reduced levels of Particulate emissions.
- Easy to operate and maintain.
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Bag Filters Air Pollution Control Equipment
A bag filter is a type of air pollution control equipment that uses a series of fabric bags to trap and remove particulate matter from flue gas.
Flue gas enters the bag filter and is drawn through a series of fabric bags. The particles in the flue gas are trapped by the fabric bags, and the clean air is exhausted out of the top of the bag filter.
Bag filters are an effective way to control air pollution from boilers. They can remove a wide range of particulate matter, including dust, smoke, and ash. Bag filters are also relatively low-maintenance and can last for many years.
Bag filters can be expensive to install and operate. They can also be susceptible to clogging, which can reduce their efficiency.
There are two main types of bag filters: pulse-jet bag filters and reverse-pulse bag filters. Pulse-jet bag filters use compressed air to periodically clean the fabric bags. Reverse-pulse bag filters use a combination of compressed air and suction to clean the fabric bags.
The frequency with which a bag filter needs to be cleaned depends on the type of boiler, the type of fuel being burned, and the operating conditions. In general, bag filters should be cleaned every 1-2 months.
There are a few signs that a bag filter needs to be cleaned. These signs include:
Increased pressure drop across the filter
Decreased airflow through the filter
Increased emissions from the boiler
Visible dust or ash on the fabric bags
The specific cleaning procedure for a bag filter will vary depending on the type of bag filter. However, in general, bag filters can be cleaned using a variety of methods, including:
Pulse-jet cleaning
Reverse-pulse cleaning
Water washing
Chemical cleaning
When cleaning a bag filter, it is important to take the following safety precautions:
Wear proper personal protective equipment, including safety glasses, gloves, and a respirator.
Be aware of the potential for high-pressure air or water.
Follow the manufacturer’s instructions for cleaning the bag filter.
More information about bag filters can be found from a variety of sources, including:
The manufacturer’s website
Trade publications
Industry associations
Government agencies
