Cleaning system shown to collect more dust

In a recent study, an improved cleaning system from US company Scientific Dust Collectors (SDC) was shown to give 9.15 times the amount of induced cleaning air, while the SDC nozzle achieves a 111% increase in peak cleaning pressure capability when compared with generic baghouse cleaning systems.

In addition, the nozzle geometry produces air velocities much higher than previously possible, allowing a significantly greater volume of secondary cleaning air to be induced. In cartridge collectors, SDC's improved cleaning system gives 6.4 times the amount of induced cleaning air, and the SDC nozzle achieves a 53% increase in peak cleaning pressure capability when compared with generic cartridge cleaning systems. SDC has developed proprietary converging/diverging nozzles mounted on pulse pipes to induce more cleaning air for more effective cleaning. Nozzles within dust collector units process the air at orifice pressures to allow further conversion of pressure energy to velocity. In the orifice throat, the velocity is sonic, or 1,050 ft/sec. When converging/diverging nozzles are mounted on the pulse pipe, the exit velocity from the nozzle will increase to supersonic velocity at 1,735 ft/sec, or almost MACH II sonic velocity with 90 psig in the pulse pipe. At the bag's throat orifice, the higher velocity is used to induce more air into the cleaning jet, resulting in better cleaning, the company says. Collector efficiency is also improved by limiting the expansion of the air jet. This is done by stopping the induction of the induced air. Rather than using a flow-restricting venturi, which reduces overall cleaning power, SDC employs the entire open area of the bag mouth to limit air induction, which, according to the company, results in greater cleaning power and longer filter life.