What is the history behind the Duo Drum “CF” ?
For the past several years the market has pushed toward total separation of the drying and mixing areas in drum mix plants. In 1990 ALmix introduced the parallel flow Duo Drum to the market. The results were flawlessly clean stacks and the end of fighting light ends in baghouses. The trend away from these parallel flow Duo Drums toward the counterflow Duo Drum “CF” came about for three reasons. First, the relatively low stack temperature associated with the counterflow process allows a higher proportion of recycle material to be processed without endangering the baghouse. Second, the proximity of the mixing drum inlet to the burner in the counterflow process facilitates the burning off of any hydrocarbons created in the mixing process. Third, the ALmix innovation of variable speed drying and mixing drums allows the counterflow dryer to be operated without the baghouse mudding often associated with counterflow drying. Why the Duo Drum design? There are a host of reasons why we have chos
