Astec’s V-Pack Stack Temperature Control System extends the range of mixes that can be produced without requiring the flights be adjusted.
- “V-flights,” unique drum flights with a deep V-shape, and its use of variable frequency drives (VFDs), which provide control of the drum rotational speed, are keys to the control system managing an asphalt plant’s exhaust gas temperature and increasing overall efficiency
- Automatically controls exhaust gas temperature across a range of mix types and operating conditions by making drum speed changes
- Keeps baghouse temperature relatively stable as mix temperature changes and even as mix types change from hot mix to warm mix, from virgin to high RAP, and from dense graded to open graded mixes
- V-flights produce a uniform veil of virgin aggregate across the entire drum, regardless of how full the drum is, the plant’s production rate, or the RAP percentage used; this enables drum speed changes to be effective as a means of controlling stack temperature
- Monitors exhaust gas temperatures at the baghouse inlet as the primary reference for control
- Enables asphalt plants that produce mix with RAP content from zero to 70% without any physical changes to flights or other plant equipment and without loss of production rate capacity or fuel efficiency
