Engineering Calcs

Dust clogged up a baghouse

We were called in by a customer on one cold morning. Their dust collection system did not work when they turned on power as usual. First, we checked the ductwork to see if there was any dust accumulated inside from the sucking points, to the fan, then to the baghouse. It seemed the ductwork was not the problem. After being in the baghouse, the filtered air went back to the workshop. Then we opened the access door of the baghouse hopper, and what we saw showed us the problem: it was packed with wood dust (Figure 1). Figure 1 baghouse hopper packed with wood dust Later, the access door on the clean side of the baghouse was opened, and one bag was taken out, it was very clear that the dust even accumulated between bags (Figure 2). Figure 2 dust clogged up between bags After the dust was removed from the baghouse, the system was turned on. In the first 20 minutes, the baghouse was warmed up without dust loading. When this happened, the daytime temperature outdoors w...

Baghouse dye test for leak detection - 2

In a periodic test of a baghouse dust collection system, dye test for leak detection was done to the baghouse by following the test procedure. The system collects wood dust, and the bags were installed 4 years ago. The air after the baghouse is recirculated back to the workshop to save energy, especially in winter. The dye test easily found glowing spots on some bags adjacent to the tubesheet with the help of a black light wand (Figure 1&2) . These spots were thought to be caused by the bleed-through of the green dye powder; they were not indicators of broken bags. We put the dye test results in the comprehensive report for this periodic system test and explained our concerns to the customer. Figure 1 Glowing spots under black light on bags, image 1 Figure 2 Glowing spots under black light, image 2 Leak Test, Air Balancing, Trouble-shooting, and System Evaluation services by Airvate Dye test for bag/cartridge leak Dust collection system and industrial ventil...

Troubleshooting: Air Header got no air for the pulse jet cleaning system

One customer told us that their dust collection system had a very weak suction on the grinding process line, and we went to their workshop on-schedule to do troubleshooting. Introduction of the dust collection system The dusty air from the plastic grinder first ran through a cyclone and the separated dust from the cyclone directly went back to the process; the airflow with fine particles from the cyclone went to a cartridge dust collector, and then the filtered air was released to outside of the building. Since the plastic dust is combustible, an explosion panel and a vent duct were installed on the dust collector, and a non-return valve on the ductwork just in front of the dust collector inlet. The cartridge dust collector was equipped with a pulse jet cleaning system controlled by a Photohelic pressure gauge. The Photohelic Gauge measures the Differential Pressure and provides the capability for “on-demand” cleaning in conjunction with a Timer Board. Troubleshooting proce...

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