The interior of a dust collector can provide ideal conditions for a dust explosion. Here's how an isolation flap valve can help you meet safety requirements and avoid a dust collector deflagration.
In this column, author Ray Cocco explains why understanding particle hydrodynamics is crucial when designing and optimizing a cyclone. Particle flow is more than the centrifugal force on the cyclone’s wall, he says, and this can help explain some of the cyclone’s issues and limitations. Topics covered include particle flow tendencies, roping, the effects of outlet velocity and cyclone length, the importance of vortexes, dipleg design and performance, and more.
For a hybrid mining and chemical company processing lime, monitoring dust collection had become a labor-intensive and safety-risking chore. Monitoring, however, needed to be done. For help finding a better way, the company contacted Donaldson, a Minneapolis-based dust collection and filtration equipment supplier. The supplier installed one of its IoT-based monitoring systems, and now the plant can safely check data on its 29 dust collectors and six larger production baghouse collectors from one computer station.
While dust collection systems are costly, you can achieve a return-on-investment (ROI) by understanding the true costs of system operation and taking informed action to reduce those expenses. This article presents the three main cost contributors that impact the budget required to operate a cartridge-style dust collector and how to mitigate those costs to get the most cost-effective ROI for your process.
This article discusses how combining magnetic separators and metal detectors can help maintain product purity on the production line.
Incorporating a dust collection system into your process is important, but system installation and operation are just tips of the iceberg. You also want to ensure the system is operating as efficiently as possible. This article describes the necessary questions to ask about ductwork, hoods and pickup points, and several types of dust collectors to ensure that your system is operating effectively and efficiently.
Columnist Jack D. Hilbert discusses how bulk density differences between two materials can affect a pneumatic conveying system's design and overall performance.
When a green technology company needed a screener to aid in reclaiming materials from end-of-life tires, the operation sought help from Midwestern Industries, Massillon, OH. Trying to consistently — and profitably — separate the ground rubber aggregates from the fine carbon black powder was a problem. After 3 weeks of testing on full-size equipment, an MEV high-frequency screener with five decks that each screen up to five different particle sizes was selected.
Incorporating automated ingredient weighing and batching equipment into a processing system can help streamline it, but scales need to be appropriate for and capable of precisely weighing and batching the ingredients in question. This article discusses how to determine ingredient requirements and select and maintain a system, all of which can help ensure automated ingredient batching accuracy.
In this column, author James L. Davis revisits a past column in which he explains the mixing test criteria needed to determine if a mixer will do a good job for a specific application. These criteria include how to determine the appropriate mixing time; when, where, and how to sample; sample size; and evaluating the data.
This two-part article describes how to weigh and batch ingredients in an accurate and cost-effective manner. Part I, which appears in September 2020 PBE, explains the different ways that materials can be measured, while Part II, which will appear in the November 2020 issue, explains how to incorporate weighing and batching methods into your process.
Static versus dynamic velocity control: Which is more beneficial in dilute-phase pneumatic conveying?
Air velocity plays a large role in how effectively and efficiently your pneumatic conveying system operates. This article discusses the positive and negative reactions that air velocity can have on a dilute-phase system. The article compares static and dynamic velocity control and the impacts each one has on blower speed, blower power, and effective velocity.
In this column, author John J. Walsh revisits a past column explaining questions that can help in choosing the best fluid-bed dryer for an application. After covering fluid-bed dryer basics, he explains the differences between stationary and vibrating fluid-bed dryers and circular and rectangular units. He also discusses the material properties for which these units work best.
Mesh blinding is one of the most common problems in any screening operation. This article discusses how blinding occurs and discusses pros and cons of devices that can help avoid the problem.
An air packer requires a reliable source of low-pressure, high-volume air to fluidize and convey material during bagging.
This article aims to provide a better understanding of the operating principles, important features, and limitations of ribbon blenders while also highlighting some basic best practices for efficient ribbon blender operation.
This article explains how hopper and hopper-to-feeder transition design can help offset material flow problems.
The deadline for facilities that handle combustible dusts to complete a dust hazards analysis (DHA) is September 7. While there was some possibility this date would be extended due to COVID-19, that’s unlikely. DHA requirements are outlined in NFPA 652, but while the NFPA doesn’t mandate compliance, OSHA, the International Fire Code, and the International Building Code are all starting to do so. This article describes what a DHA is, why it’s necessary, and how to successfully complete one.
In this column, authors Jack Hilbert and Colin Barbeau provide information on the economics of pneumatic conveying with regard to how it compares with alternative forms of material conveying. Since the processes, design criteria, conditions, and technical advantages and disadvantages vary from project to project, the authors break down two different case studies as examples.
When Cirque du Soleil, the performance group known for its innovative staging, needed to re-create a beach scene on a cliff, 250 cubic feet of granulated cork was used to simulate the sand. During each performance, the cliff tilts and the sand and performers fall into an off-stage net. When the group needed to figure out how to accomplish this repeatedly for daily performances, it contacted Flexicon. The supplier put together a combination of hoppers, conveyors, and classifiers that allow the show to go on.
Dry granulation basically involves using compaction and comminution to agglomerate and then break down poorly flowing powders into granules to help ensure a homogenous blend. This article explains how dry granulation can be used to maintain a homogenous powder blend and flow for a tablet press. The article also discusses supplier-conducted tests on how recycling screened-out granules back into the raw powder affects the blend.
Learn how to choose accumulating equipment that can handle your material, fit your available space, and meet your other requirements to eliminate production slowdowns and improve process efficiency.
This article explains the basics of dry powder classification and describes some of the most common classification methods available for bulk solids manufacturing applications.
Jewel Date Company harvests and processes 2 million pounds of dates and date products annually. The company had been using a hammermill for size reduction, but the method lacked precision and took 8 hours to process 2,000 pounds of dates. The company consulted Munson Machinery, which recommended installing a screen classifying cutter. Jewel now can produce a wider range of particle size options and produce them with less frictional heat, avoiding granule melting and clumping.