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For almost all asphalt mix formulations, the exhaust gas temperature can be adjusted to an optimum level. This is important because there is only one step between reaching the dew point temperature and wasting energy.
How should this adjustment be made?
First, the speed of the drum can be used to adjust the curtain in the dryer, which optimizes the hot gas temperature. Remember that the slower the dryer turns, the less material remains on the curtain. This means that more energy will flow to the filter, causing the inlet temperature of the filter to rise.
Conversely, the faster the drying drum rotates, the more material moves within the curtain. More energy will remain in the material and the energy flowing to the filter will decrease, reducing the inlet temperature of the filter. As a result, the efficiency of the dryer is increased and fuel consumption is reduced.
The frequency converter and the technology it brings will save energy and expand the range of products in the mixing plant.
Let us look at an example:
Assuming an asphalt mixing station with an output of 240 tons per hour produces an exhaust gas temperature of 110 °C, the frequency converter on the dryer can reduce this temperature to 95 °C. This will increase the efficiency of the dryer by 2%. This is a significant benefit, meaning that a batch of mixing plants can save 21,500 liters of hot oil (diesel) per 100,000 tons of material produced.
Note: Always consider the dew point temperature of the exhaust gas during adjustment. For exhaust gas containing no sulphur dioxide, the recommended temperature is 90 ° C ~ 100 ° C; for sulphur dioxide containing gas, the recommended temperature is 120 ° ~ 130 ° C, depending on the concentration. The source of sulfur dioxide in the exhaust gas is fuel (eg heavy oil, lignite) or aggregate.
Using a frequency converter on the dryer increases flexibility and ultimately saves money.