This week’s photo shows two types of flights in a rotary dryer: standard lifting flights, and advancing flights. Flights, or lifters, are positioned inside the rotary drum and play a fundamental role in the drying process. As the drum rotates, flights lift the material, and …
Rotary kilns (also known as rotary calciners) are used to heat solids to a predetermined temperature in a controlled processing environment in order to create a chemical and/or physical reaction. While rotary kilns have long been used in producing cement, their flexible capabilities have extended …
Our photo this week highlights a frac sand dryer. Internal flight design and placement was customized to maximize heat transfer between…
Rotary kilns use extremely high temperatures combined with controlled retention times to cause a chemical reaction or phase change in a material. At certain temperatures (different per each material), a material will undergo a chemical reaction or phase change. This is often necessary to bring …
Rotary kilns (also known as rotary calciners) are used to heat solids to a predetermined temperature in a controlled processing environment in order to create a chemical and/or physical reaction. While rotary kilns have long been used in producing cement, their flexible capabilities have extended …
Though far less common than the need to dry or thermally treat a bulk solid material, some process settings call for preheating a material in preparation of downstream processing. In achieving this objective and meeting the high tonnages associated with bulk solids processing, rotary dryers …
The process of sizing a rotary dryer is one of precise engineering involving complex calculations and meticulous design. While the process is not well simplified into a few paragraphs, an explanation can be offered as to some of the concepts behind the process of rotary …
While indirect coolers are used far less commonly than their direct cooling counterparts, they are often the best solution in a few specialty applications. A direct cooler relies on direct contact between the material and chilled air in order to cool the material, which can …
Cycling and chemical incompatibility are the two main causes of refractory failure in a rotary kiln. Cycling Cycling is the heating up and cooling down of a rotary kiln, and it is the largest source of refractory failure. Refractory expands with the kiln as it …
Rotary kilns use heat to cause a physical change or chemical reaction in a particular material, and can be utilized to carry out a variety of processes. One of the more common processes carried out in a rotary kiln is heat setting. This refers to the act of …