How is baghouse efficiency calculated?
of the baghouse. 2. First calculate the total cloth area of your collector by calculating the total filter area of each filter (bag diameter x 3.14 x length ÷ 144 [for number of inches in a square foot] = filter cloth area) and then multiply that figure by the total number of bags in the collector.
What factors should be considered to design a baghouse?
Design variables Pressure drop, filter drag, air-to-cloth ratio, and collection efficiency are essential factors in the design of a baghouse. Pressure drop (ΔP) is the resistance to air flow across the baghouse. A high pressure drop corresponds with a higher resistance to airflow.
How do you calculate dust load?
To calculate loading, take the dust being sent into the collector (lb/hr) and multiply it by 7000 grains/lb. You then calculate the total system air volume per hour. Finally, divide the grains per hour by the total airflow in an hour to get grains/cu ft.
How is dust collector size determined?
If it’s round, measure the diameter. For a rectangle, multiply the length by width, then multiply that number by 28 to find the flow of CFM at 4,000 feet per minute (fpm) airflow. Find the largest CFM number out of all your tools, and that’s what you’ll go on for the required rating for your dust collector.
How does a baghouse work?
Baghouse systems are engineered to collect, capture, and separate dust and particulates from the air. The gas stream then passes through the filters, while particles remain on the filter media surface, thus separating the particulates from the air.
How do you calculate CFM for dust collection?
For a rectangular port, calculate the area (multiply length times width, in inches). Then, multiply that area times 28 to find the approximate flow in CFM @ 4,000 feet per minute (FPM).
How does a baghouse system work?
What do baghouse filters do?
A fabric filter, commonly referred to as a baghouse, is a dust collection device that houses filter bags, also known as filter media, which removes particulate matter/dust from process gases.
What is the air-to-cloth ratio in baghouse?
How to Calculate Air-to-Cloth Ratio. Air-to-cloth ratio (or filter velocity) is simply the amount of air going through each square foot of filter media each minute. It is calculated by dividing the amount of airflow (CFM) by the amount of filter media in the dust collector.
How many CFM does a dust collector need?
They found most small shop stationary tools need about 1000 cubic feet per minute (CFM) of airflow to have good fine dust collection and only need about 350 CFM for good “chip collection”.
How do I calculate cfm?
This practical math formula goes a long way when you’re considering air ventilation improvement in an indoor space:
- CFM = (fpm * area), where fpm is the feet per minute.
- To find the cubic feet per minute, substitute the FPM value with the area after the area is squared.
What do you need to know about baghouse sizing?
Design Considerations • Air to Cloth Ratio –Establishing component of baghouse sizing –Refers to volume of air (cfm) in relation to filtration surface area (square ft) –EXAMPLE: • 8,000cfm air required for dust control • Kice VR96-10 Filter offers 1,131ft² of filtration area 8,000cfm / 1,131ft² filtration area = 7.07 air:cloth
What is the air to cloth ratio in baghouse?
• Air to Cloth Ratio –Establishing component of baghouse sizing –Refers to volume of air (cfm) in relation to filtration surface area (square ft) –EXAMPLE: • 8,000cfm air required for dust control • Kice VR96-10 Filter offers 1,131ft² of filtration area 8,000cfm / 1,131ft² filtration area = 7.07 air:cloth Design Considerations
How is upward velocity of air measured in a baghouse?
–Upward velocity of air/particulate between filters inside baghouse –Measured in fpm (feet per minute) –Determined by dividing airflow (cfm) by cross sectional area of filter housing less bag area –Not to be confused with can velocity
How to calculate the size of a filter bag?
Most companies that design baghouses know the general cloth area of their filter bags. A filter bag calculation can also be made because filter bags are round. If you know the diameter of the bag, multiply this diameter by 3.14 to get the circumference. (Think back to high school math and the circumference of a circle .)
