Pulse bag filter

Pulse bag filterWhen dealing with high-temperature flue gas, high-temperature filter materials should be selected. Nowadays, glass fiber filter media is commonly used, which can withstand a high temperature of 260 ℃. However, when the temperature of the flue gas exceeds the allowable temperature of the filter media, it is generally necessary to cool it before entering the bag filter (which should be kept above the dew point temperature). There are three methods of cooling:

1. Mixing cold air and inhaling a certain amount of surrounding air refers to mixing it with high-temperature flue gas to reduce temperature. When using a capture hood to capture high-temperature flue gas, ambient air can be simultaneously inhaled. Although this method is simple, it increases the volume of filtered gas significantly.

The specific calculation of the cooling device can refer to the relevant parts of thermodynamics. When cooling, the temperature of the gas should be kept not lower than the dew point, which will cause condensation and make the bag and dust damp. The dust will stick to the bag and block the holes of the bag, greatly reducing the cleaning effect and increasing resistance.

2. Water cooling: There are two methods. One is to spray water directly into the high-temperature flue gas for cooling, which can be used as a special spray cooling tower. The cross section wind speed of the cooling tower is generally 2-3.5 m/s. In order to prevent water mist from entering the cloth bag for removal? Dust collectors can use temperature control systems to regulate water volume. Another method is to use a cooling water pipeline installed in the pipeline that transports gas, which can avoid the problem of water mist entering the bag filter and corrosion. This method has strong cooling capacity and occupies less space, and water mist may be brought into the bag filter, causing it to become damp or corroded.

3. Natural cooling, lengthening the length of the pipeline for transporting gas,Pulse bag filterThe natural convection and radiation heat dissipation between the pipeline and the surrounding air cool the gas. It is commonly used for metal pipelines and can be designed as an S-shape to extend the distance. This method is simple, has weak cooling, and occupies a large amount of space.