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Learn what industrial fans have to do with building our roads and highways. If you’ve ever taken a deep breath driving by a paving project, you might have some ideas. Get into the nitty gritty.

This video provides an overview of the two primary types of asphalt plants and how they use industrial fans in the process of making pavement. The fans serve the vital purpose of drying and heating, as well as controlling emissions. A combustion fan helps heat and dry the aggregate, and an Induced Draft (ID) fan helps minimize waste and pollution, See how it all comes together in this 2½ minute video.

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View full transcript:

Industrial fans play a large role in building our roads and highways. Fans are used by asphalt plants to make asphalt pavement. There are (2) primary types of asphalt plants - batch mix and drum mix (also known as a continuous mix plant).

Batch and drum asphalt plants essentially dry an aggregate mixture of sand and rock and mix it with hot asphalt cement or bitumen. The batch asphalt plant moves the aggregate through a dryer. The heated aggregate is stored until a “batch” amount is reached and then emptied into a pug mill where it is mixed with the hot asphalt cement. This mixture is then sent to the construction site for immediate use.

The drum mix plant also moves the aggregate through a dryer, but it mixes the hot asphalt cement with the aggregate while still in the rotary drum dryer. This allows for increased and faster production, as two processes are combined into one.

Both types of asphalt plants use industrial fans in the drying/heating process and in controlling emissions. A combustion fan is used with a burner to heat and dry the aggregate.

To minimize waste and pollution, a baghouse system is used to collect fine sand and dust as the asphalt pavement is created. An induced draft or ID fan is used to suck the sand and dust through the baghouse collectors and return these particles to the mix.

Asphalt plants often require several industrial fans. As you know, building roads is hard physical work, and it’s even tough on fans. Robust fan construction with regular fan maintenance is necessary for reliable asphalt plant operation. Fan impeller and bearing failures can be minimized when fan vibration levels are tested and excessive vibration is corrected. It’s always a good idea to have fan spare parts on hand to prevent lost production time should the fan fail during operation.

Here at AirPro, we are happy to help asphalt plants build more roads and highways with our heavy duty fans and on-site service. For more information, you can reach our engineering department at 715-365-3267.

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