One factor that can greatly influence your dryer selection is the need to maintain or reduce your material’s particle size and shape during drying. In this article, columnist John J. Walsh describes a variety of dryers and how they can either help or hinder those efforts.
Vacuum pneumatic conveying provides safe transfer of bulk dry materials and can help maintain tight industry standards for sanitation and environmental safety.
Understanding the strengths and limitations of different types of pneumatic conveying systems can help you choose the one best suited to your application.
In this column, author Greg Mehos offers details on how particle size enlargement is often used to reduce the likelihood of unwanted powder agglomeration. This is because the likelihood of caking generally decreases when particle size increases due to the decrease in a powder’s overall cohesive strength and why he often recommends intentional agglomeration when the objective is to prevent it.
When conveying material, controlling material flow is important for many reasons, including precise measuring. Slide gates controlled by pneumatic actuators are one way to control that material flow, and a variety of control options can be added to these actuators to help with precision. This article discusses the options.
Vibratory feeders and screw feeders often can work well for the same application. When choosing between them, one consideration is the required investment. This article examines the short-term and long-term life-cycle costs of a vibratory feeder compared to a single screw feeder.
“Simple” bulk solids grinding can quickly get complicated. In this column, Willie Hendrickson points out a few situations in which grinding complications can develop. He also touches on how and why these situations can happen and how to avoid them.
Form-fill-seal (FFS) packaging equipment is prevalent in a wide variety of polyethylene bag filling applications. Both vertical and horizontal machines are available. This article describes some of the considerations that might impact the purchasing decision when choosing between the two.
In this column, author Greg Mehos explains the basic types of agglomeration mechanisms, the equipment involved, and how to choose the process most suitable for your desired end result.
Although there are a variety of factors that affect bulk solids mixing and blending, some problematic issues are common, and one is overmixing. This article explains the risks of overmixing and offers simple tips to help determine and achieve the most optimal mix cycle for your application.
Monitoring mixing processes via inline technology offers practical benefits. This article examines those benefits focusing on the technique of drag force flow measurement. Experimental studies illustrate the capabilities of the process monitoring techniques for a range of mixing and blending applications.
This sodium bentonite processing facility switched from tungsten-carbide-tipped pins in its pin mixer to versions covered in a nickel matrix cloth with tungsten carbide chips. The result has been a “significant” increase in the amount of time between pin changeouts, according to processor Black Hills Bentonite.
In this column, author John J. Walsh revisits a past discussion of typical control systems for continuous direct-contact (convection) and indirect-contact (conduction) dryers, the limitations of these control systems, and how newer technologies may be overcoming these limitations.
Wisconsin-based Jackson Concrete had been experiencing cold-weather silo backup problems when air pads aerating cement in the company’s silos would wear down and harden due to moisture. The company sought the help of Solimar Pneumatics, which installed silicone disc fluidizers to aerate the two 1,000-barrel silos. The result has been no more backups.
Hain Celestial Group was encountering a variety of bridging and other flow issues with a vegetable-based snack food. To figure out a solution, Hain sought the help of Thayer Scale, which tested the materials in its recently overhauled, 1,800-square-foot test center. The solution consisted of a feeder with consistent volumetric flow, a smaller feed screw, and feed bin agitators.
Most vacuum conveying systems don’t require custom solutions to meet your powder and bulk solids processing requirements. Pre-engineered systems are now so technically advanced that they’re useful as is for a wide range of industries. This article talks about situations, including real-world examples, when turnkey, packaged conveying systems fit and when custom enhancements are necessary.
Facilities that process bulk solid materials often need to replace old or worn processing equipment, add manufacturing lines, or possibly even construct a new plant. This article provides checklists and questions to ask related to scope-of-work and budgetary details to help ensure that these types of projects proceed smoothly and successfully.
Pneumatic conveying systems have the advantage of being able to accommodate various pipeline routing geometries, but the options aren’t limitless. In this article, columnists Jack Hilbert and Etienne Brochu first define a basic pneumatic conveying system and conveying modes and then discuss some conveying line geometry best practices.
Storage silos might not be top of mind in your operation, but they’re a crucial component for any bulk solids processor, and if they’re ignored, problems can develop. This article explains the importance of regularly inspecting your silo and details how to prepare for an inspection, how to compile the information, how to assess the variables, and how to analyze any concerns.
For your pneumatic conveying system to work efficiently with other system components, each piece of equipment needs to be considered in relation to how it will impact the system as a whole. In this column, Jack and Julien discuss how filtration equipment and pneumatic conveying system operations can impact each other.
This two-part article describes how to weigh and batch ingredients in an accurate and cost-effective manner. Part I, which appeared in the September 2020 issue of PBE, explained the different ways materials can be measured, while November 2020's Part II explains how to incorporate weighing and batching methods into your existing process.
Screw feeders are used across a broad range of industries and material applications. This article discusses ways to help mitigate some of the issues that can occur when using a screw feeder.
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.