Optimisation of a Drying Process in a Rotary Dryer for Mineral Materials
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United States of America Patent
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Issued Date -
Oct 20, 2011
app pub date -
Nov 4, 2009
filing date -
Nov 5, 2008
priority date (Note) -
Abandoned
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Abstract
The system is peculiar in that there is provided a number of temperature sensors inside a rotary dryer, the sensors indicating a representative temperature of the materials dried/heated in the zone in which the sensor in question is located. By combining the measured temperatures with indications/measurements of flow, temperature and humidity of the materials to be dried, and temperature and humidity of the flue gas, a regulating unit/system with a simple mathematical model of the drying process may control the oil or gas burner optimally, such that the energy consumption for the drying process is minimised, and the waste of material occurring by too much or too little heating, typically by start and shutdown, is almost eliminated. The system may be used both by concurrent and countercurrent rotary dryers, respectively, and by single as well as double chambered rotary dryers, respectively, for drying and heating mineral materials, primarily for asphalt production.
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