Airvate Blog

  Introduction There are two common reasons for choosing to install more than one cyclone in parallel. 1.   One device handling the whole gas stream would become too large for practical purposes. 2.   One large cyclone could not achieve the required separation efficiency. Cyclones in parallel offer engineers a practical way to increase the collection efficiency without increasing pressure loss by splitting up the solid-laden process stream over two or more identical cyclones and operating them in parallel. Parallel arrangements of cyclones can be modeled using the same model equations as for single units. The solids-bearing gas stream is simply divided evenly between the parallel-working units. Overriding concern when designing cyclones in parallel When designing parallel cyclones, the overriding concern is that the gas and solids be distributed evenly among identical units, and consequently, each will theoretically have the same pressure drop. One way of ...

  Introduction The design of using a single cyclone connected to each particulate matter source point is common in many industrial applications. In spite of the fact that each cyclone has been designed to handle separation of particles, there are many situations where a single cyclone is inadequate for the particle collection task. In such situations, it is often feasible to use multiple units either in series, in parallel, or both. Multiple-cyclone separators in series consist of a number of individual cyclones. They are usually used in two cases: inlet dust loading is high and, emission from single cyclone configuration would be too high.  Cyclones in series When cyclones in series are feasible, a second, or even a third separator can be added in series with the first stage separator to collect additional solids. It is customary to refer to the individual stages as the “primary,” “secondary,” and “tertiary” stages or simply as the “first,” “second,” and “third” stage. Sketch...

  Introduction A cyclone separator is also called a cyclone dust collector. The typical industrial cyclone is a centrifugal reverse-flow cyclone. The dust outlet of a cyclone is called a material discharge outlet or cone-tip. Sketch of a reverse-flow, cylinder-on-cone cyclone with a tangential inlet I have been asked how the diameter of the dust outlet affects the performance of a cyclone a couple of times by colleagues and final users. Normally, when engineers size and/or design a cyclone, they pick a standard one from manuals or handbooks. However, when dust loading is high, cyclone designers worry about whether the dust outlet is big enough. If the separated dust cannot be discharged immediately, a cyclone will not be functional. In reality, after a cyclone was put into use, final users worried about the same thing. When there is blockage at the cone bottom, they have to hit the bottom part with a hammer to dislodge the plug, and this often leaves dents or deformation on...

Introductory Air balancing, trouble-shooting, and system evaluation in dust collection and industrial ventilation systems all require accurate measurements of air flowrates. Normally, the Pitot tube and magnehelic gauge (or manometer) are used to measure the velocity pressure and static pressure inside of a duct (round or rectangular), and then the air flowrates are calculated based on the measured values. This article talks about 5 kinds of uncertainties that always happen in field measurements using Pitot tube, the estimated maximum errors with some of them, and how to avoid some uncertainties with recommendations from manuals and standards ( ISO 3966 and NF X 10-113).   Uncertainties, maximum errors, and how to avoid some of them In addition to the inherent errors from Pitot tube and gauges themselves (calibration, resolution, drift, etc., sometimes with the correction factor of Pitot tube involved), there are other errors we have to...

This post includes 3 sections: One pressure gauge reading is high but the baghouse works fine One pressure gauge reading is high and indicates baghouse problem Explanation about 2 types of differential pressures

  We did a Dye test for a customer in a newly installed baghouse. In this standard dye test procedure, green fluorescent dye powder was applied. No leaks were found in the clean plenum of the baghouse. All the bags were properly installed and no breach between the clean air and dirty air plenums was found either. View of Clean Plenum after Dye applied Per the request of our customer, we also got inside the dirty side of the baghouse through the inspection door on the hopper and visually checked dye powder distribution on the bags. From the picture below, it is apparent that the dye powder evenly distributed on all the bags, which means that the airflow was evenly distributed too. Customer was very happy about this visual check. Bottom View of Bags after Dye Applied