What is the typical air-to-cloth ratio in baghouses? The optimal ratio is usually determined by considering the type of application, dust concentration, and other parameters. Dust collectors also have different self-cleaning systems. Sites featuring finer particles or chemicals typically use pulse jet baghouses, those with large particles tend to use reverse air baghouses, while shaker baghouses
are frequently preferred when the budget and temperature are low. Here is the typical baghouse air-to-cloth ratio in different industrial environments and how they differ depending on the facility.Example 1: Coal-fired power plant baghouse with fly ash
Coal-fired power plants
typically have high dust concentrations that require a lower air-to-cloth ratio for effective filtration. The air-to-cloth ratio in a reverse air baghouse for fly ash is typically around 3:1-2:1. This means that for every 2 or 3 cubic feet of gas entering the baghouse, there is 1 square foot of filter cloth available. The low ratio ensures that the bags do not become saturated with dust and can effectively capture the particles.Example 2: Woodworking baghouse
Woodworking facilities usually have lower dust concentrations than cement plants, so their baghouses tend to have a higher air-to-cloth ratio. A typical air-to-cloth ratio for a reverse air baghouse in a woodworking plant is around 8:1. With this ratio, the baghouse can handle a larger gas volume without overloading the filter bags. This higher ratio also means that the bags need to be cleaned less often, thereby reducing downtime and maintenance costs.Example 3: Chemical processing baghouse
Chemical processing facilities often have very low dust concentrations and require a much higher air-to-cloth ratio than other industries. A chemical processing baghouse might have a shaker baghouse air-to-cloth ratio as high as 20:1, meaning that 20 cubic feet of gas can pass through each square foot of filter cloth. With such a high ratio, the bags will not clog very easily and even the smallest particles can be captured, ensuring that the process will be able to adhere to strict environmental regulations.Example 4: Pharmaceutical baghouse
Pharmaceutical plants have stringent requirements for air quality and require a baghouse with a very high efficiency rating. The air-to-cloth ratio for a pharmaceutical baghouse, assuming jet pulse cleaning is used, might be as low as 2:1 to ensure that the bags can capture even the finest particles and prevent them from entering the environment. With such a low ratio, the bags can become easily saturated, so frequent cleaning is required to maintain proper performance.