Energy-saving drying and cooling by evaporative cooling
Evaporative cooling as a method for the reduction of the energy consumption on drying sand
Sand is one of the most widely used construction materials in the world. Among other products, it is used for the manufacture of mortar, tile cement, plaster and floor finishes, which are marketed as so-called ”ready mix” products. In addition, sand is required for the manufacture of glass; particularly high-quality sand latterly in the form of so-called ”frac sand” is used during natural gas extraction and in many other sectors of industry. It is necessary to dry the sand, e.g. so that it can be screened subsequently into different fractions with high selectivity. Cooling is necessary if required by the downstream process steps or due to the subsequent addition of temperature-sensitive additives, as well as for storage and packaging reasons. Allgaier Process Technology GmbH is a market leader in the area of sand drying with the drum dryer system Mozer®. Double-shell units in particular are used; here the drying takes place in the inner drum tube, while the cooling is undertaken in the outer tube on the same unit. Along with the proven, extremely robust and economical drying-cooling drum system TK in which the material to be dried is cooled by ambient air, Allgaier supplies the system TK+, which makes a very significant contribution to saving fuel and electrical energy by means of so-called evaporative cooling. The somewhat higher investment costs are amortised in a short time by the energy saving.
