Custom Built Rotary Dryers Process Video
With the recent increase in demand of high volume drying and new technological advances, Worldwide Recycling Equipment Sales, LLC now offers the capability of custom built rotary dryers. Customizable options include choice of direct or indirect heating, burners ranging from 1 to 30 MMBtu, rotary drums ranging from 18’ to 70’ with a variety of diameters, drums made of carbon steel or stainless steel and variable flight design.
This 24 foot Rotary Kiln Dryer is one of many examples. The drum is 24’ long with a 66” diameter and steel flights. It comes with a 25 MMBtu Hauck Beta burner with a 25 hp blower and a cyclone with a 10 hp blower. This model includes an infeed auger and discharge auger and comes complete with controls. Worldwide Recycling Equipment Sales can custom make other options to fit the intended application.
The primary use of a rotary dryer is to reduce the moisture content in a variety of materials. They are excellent for drying sawdust, wood shavings, hay, livestock renderings, by-products used for animal feed, paper, municipal solid waste, salt and sludge. Rotary dryers are a key piece of equipment in soil remediation. The rotating drum heats the soil to a temperature high enough to vaporize the contaminants, but not so high that the soil is incinerated.
As the dryer rotates, the material is lifted by a series of fins called flights that line the inner walls of the drum. As the material rolls back down off the flights, it passes through a stream of hot gas and falls to the bottom of the dryer. This process continues until the material is thoroughly dried. Dryers are offered in both direct and indirect heated models. When a burner is used, making up the gas stream of both air and combustion gases, it is considered direct heat. When the gas stream is heated through a different mean and no combustion gases enter the dryer, it is an indirect heated model. Indirect heated models are useful when product contamination is a concern.
Some units include a cyclone that acts as an air pollution control device, collecting and filtering the material and carrying it to the dryer’s discharge system. In this case, the material is passed from the drum into the cyclone before it is discharged. Use of a cyclone with a dryer is common when a dryer is being used for soil remediation jobs because it separates the soil from the toxins that were vaporized during the drying process. This way, the newly-cleaned soil is released, but the toxic vapors are captured and passed into an oxidizer that breaks them down and restores them to CO2 and H2O so they can be admitted into the atmosphere, pollutant-free.
With the quick and efficient drying process they provide, rotary dryers are used for a variety of applications beyond soil remediation. They are used in the food processing industry to dry grains, citrus and potato by-products, spices and nuts; in the metal and mining industries to dry a variety of metal concentrates and minerals such as aluminum, coal, limestone and fluorescent lamp powder; and in the ceramic and chemical industries to dry silica and beach sand, ceramic powders and synthetic resins.