A New Year's resolution is a decision a person makes on the first day of a year that will somehow improve themselves. Despite being a mainly Western tradition, there is evidence that people as far back as the ancient Babylonians practiced this annual ritual, with promises to return borrowed objects and pay debts. The most common reasons for failing to follow through on resolutions are unrealistic goals or simply forgetting about them. One very realistic resolution that should never be forgotten is the correct maintenance of an industrial dryer.
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As mentioned in a previous blog article, the Rotacurrent and Venturijet Flash Dryers operate utilizing the selective principle, and each has its own particular advantages. The Venturijet reduces the size of the cyclone and complementary dust collection equipment, while the Rotacurrent handles non-sticky products without back-mixing. Heyl & Patterson offers both types, but this article will focus on the Venturijet.
Because an industrial dryer is a major capital investment for any organization, it pays to select and test the unit carefully. Dryer life can be measured in decades, so the selection of inefficient equipment can have a long-term impact on the economic health of the facility that houses it. The selection of drying equipment is predominantly an exercise in which knowledge, experience and science all play important roles. Because of the complexity of the drying process, many factors need to be considered and weighed.
As mentioned in a previous blog article, the Rotacurrent and Venturijet Flash Dryers operate utilizing the selective principle, and each has its own particular advantages. The Rotacurrent handles non-sticky products without back-mixing, while the Venturijet reduces the size of the cyclone and complementary dust collection equipment. Heyl & Patterson offers both types, but this article will focus on the Rotacurrent.
Central to all drying and cooling processing is the concept of "residence time." Process engineers define this as the amount of processing time necessary for a given product with a specified moisture content, particle size, physical structure and temperature to reach a desired final state of dryness. In conventional or "straight-tube" flash dryers, determining the residence time is a calculation involving the length of the tube, the makeup of the material to be processed and the air velocity which moves the material from feed to discharge.