Rotary Dryers,

QUALITY DRYER FLIGHTS

Tarmac customers dry a wide variety of products in our thermal rotary dryers. Feed stock includes clumpy agricultural products (like hemp) to fine material (like fly ash), and large heavy aggregates (like limestone) to small aggregate (like frac sand) to name a few. Dryer flights control the way the material handling and flow inside the dryer. Different types of starting material require different types of flights. We will look at four different types.

SPIRAL FLIGHTS

Spiral flights are primarily used where material is introduced into the dryer. The spiral flights move the material away from the inlet. This keeps the material from backing up or blocking the inlet. In addition they prevent the material from falling out the end of the dryer.

VEILING FLIGHTS

Veiling or lifting flights are used to maximize heat transfer between the material and hot gas stream. Two things happen during veiling. First, the dryer removes moisture from the material. Next, once all the moisture has been removed, the material can be heated to the desired temperature (212F+). There are several different shape designs of veiling flights. Each style can affect the material differently.

TARMAC’S VEILING FLIGHTS

Tarmac often uses a saw tooth design because it works well with many different type of materials. Veiling flights lift the material up and drop it in a “veil” or a curtain across the diameter of the dryer. We can adjust our three position veiling flight to accommodate different types of materials to create a uniform veil in the dryer. This curtain forces the hot air to flow through the material and not around it, thus removing moisture and heating the material.

COMBUSTION FLIGHTS

Combustion flights are flat and close to the outer shell. Material moves under the burner flame using combustion flights. As a result, the material is heated but does not make direct contact with the flame.

PADDLE or DISCHARGE FLIGHTS

Finally, paddle or discharge flights move the material out of the dryer. These can vary in shape slightly depending on the location of the discharge, but often the paddle flight is flat and runs parallel with the dryer.

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