Introduction to gas box pulse bag filter

The air box pulse bag filter is a high-efficiency bag filter imported from abroad with advanced level in the 1990s. It overcomes the shortcomings of insufficient anti blowing and dust cleaning intensity in the original chamber, and simultaneous pulse blowing and filtering of dust. It combines the advantages of various bag dust collectors such as chamber blowback and pulse dust cleaning. Expanded the application scope of dust collectors and improved dust collection efficiency. Extended the service life of the filter bag.

Gas box pulse bag filter products can be widely used in dust collection systems such as crushing, packaging, warehouse roofs, clinker coolers, and various grinding machines in the cement and building materials industries; It is also used for dust collection of exhaust gases from metallurgy, chemical industry, machinery, and civil boilers. The material of this series of dust collector filter bags is generally polyester needle punched felt, which allows continuous use at temperatures ≤ 120 ℃. If the filter bag is made of aramid needle punched felt (NOMEX), it can be used at a temperature of up to 210 ℃, but the filter material made of this material is expensive. If the temperature of the treated exhaust gas is higher than the allowable temperature of the filter material mentioned above, cooling measures should be taken before the exhaust gas enters the dust collector.

The pulse bag dust collector with an air box is an outdoor type consisting of various sizes with different numbers of chambers and bags per chamber. There are four types of bags in each room: 32, 64, 96, and 128 bags. The diameter of the filter bag is 130mm, and there are two types of filter bag lengths: 2500mm and 3200mm. This series of dust collectors can operate under negative or positive pressure without any changes to their body structure. Their dust collection efficiency can reach over 99.9%, and the dust concentration of the purified gas is less than 100mg/m3 (standard). If this series of dust collectors is used in cold regions, insulation devices need to be added when the calculated outdoor heating temperature is ≤ -25 ℃.

Construction and working principle of pneumatic pulse bag filter

The pneumatic pulse bag filter dust collector consists of a shell, ash hopper, ash discharge device, bracket, and pulse cleaning system. When the dusty gas enters the dust collector from the air inlet, it first hits the inclined partition in the middle of the air inlet and outlet, and the airflow turns to flow into the ash hopper. At the same time, the airflow speed slows down. Due to inertia, the coarse particles of dust in the gas directly fall into the ash hopper, playing a role in pre dust collection. The airflow entering the ash hopper then bends upwards and passes through the filter bag with a metal frame inside. The dust is captured on the outer surface of the filter bag, and the purified gas enters the clean room at the upper part of the filter bag chamber, where it is collected and discharged through the air outlet pipe. The air inlet is located on the ash hopper, and after entering the ash hopper, the airflow first hits the baffle at the end of the air inlet duct, which has the same function as the above principle. The shell is divided into several independent dust collection chambers by partitions, and the PLC control program takes turns cleaning each chamber according to the set time interval. Each dust collection chamber is equipped with a lift valve. During dust cleaning, the lift valve is closed to cut off the filtered airflow through the dust collector. Then, the pulse valve is opened to spray high-pressure air into the filter bag to remove the dust on the outer surface of the filter bag. The pulse blowing width and cleaning cycle of each dust collection room are automatically and continuously controlled by a dedicated PLC cleaning program controller.

Characteristics of pulse cleaning bag filter with gas box

The characteristic of the pneumatic pulse cleaning bag filter is to use separate chambers to clean the dust alternately, which is called offline cleaning. When a certain room enters the spray cleaning process, the filtered airflow is cut off, avoiding the secondary flying of dust generated by the spray cleaning process.

Each configuration of the pneumatic pulse cleaning bag filter is equipped with 1-2 pulse valves, without using a row blowing system, resulting in simple results and very convenient maintenance.