Avoidance of over-drying is another aspect of further improvement of dryers' operation. This may be achieved by online measurement of product moisture content. In addition, the product moisture often lies below the required specification for further processing or sale, which also contributes to higher energy consumption as not only the additional solvent is to be evaporated but also higher off-gas temperatures are necessary increasing the heat losses over the gas outlet. For this reason, the dryer should be operated at the maximum allowed product moisture.
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