Working principle of pulse bag dust collector

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http://air.chinaep-tech.com/upload/image/7/zt080625g005.jpg 　　　　　　　　　　　　 Pulse injection bag dust collector Working principle of pulse injection bag dust collector: When dusty air passes through the filter bag, the dust remains on the outer surface of the filter bag, and the purified gas is discharged from the upper part through the Venturi tube. There is a blow pipe above each row of filter bags. The blow pipe is equipped with a nozzle corresponding to each filter bag. A pulse valve is installed at the front end of the blow pipe. The opening and closing of the pulse valve is controlled by a program control mechanism. When the pulse valve opens, compressed air is ejected from the nozzle at high speed. The induced air, which is 5 to 7 times larger than its own volume, enters the filter bag through the Venturi tube. The rapid expansion of the filter bag causes impact vibration, causing the dust attached to the outside of the filter bag to fall off. The injection pressure of compressed air is 500-600kPa, the pulse period (time interval between injections) is about 60s, and the pulse width (time for one injection) is 0.1-0.2 seconds. The use of pulse bag dust collector requires a compressed air source, so there are certain limitations in use. Currently, there are three types of commonly used pulse controllers: contactless pulse controllers (composed of transistor logic circuits and thyristor contactless switches), pneumatic pulse controllers and mechanical pulse controllers. This cleaning method has high cleaning intensity and good cleaning effect. Due to the short cleaning time, the dust collector can work continuously without interruption. The injection pressure of compressed air is an important operating parameter. In the early stage, the injection pressure is (5~6)×105Pa. After research and improvement, the injection pressure has been reduced to (2~3)×105Pa, and good dust cleaning effect can still be achieved. Its filtration wind speed can reach 2~4m/min. The resistance adopts timing control or constant pressure difference control, generally 1000~1500Pa. There are many forms of pulse bag dust collectors, such as the annular type using a bad jet venturi, the down-jet type where the jet air flow is consistent with the direction of the dust-laden air flow, the counter-jet type and pulse flat bag dust collector that inject simultaneously above and below the filter bag, etc.