Powder cooler Indirect

industrialexhaust gas heat recoveryfor the chemical industry

GRELBEX rotary coolers are indirect - meaning that the material is cooled indirectly through contact with tubes. OPERATION They are designed to guarantee reliable operation, high efficiency, maximum industrial availability, and easy maintenance. These operating criteria make our rotary coolers a wise choice for cooling powdered solids. The cooler consists of a rotating cylinder with internal fins that agitate the product and allow it to slowly advance inside the drum. A network of tubes, through which a cooling fluid (usually just air) circulates, is integrated into this drum. The product, in contact with these "cold" tubes, is cooled in a counter-current flow. This operating principle is particularly well-suited for fine products (from a few microns to a few millimeters) with inlet temperatures ranging from 150°C to over 1200°C. Our chillers are designed according to the required inlet and outlet temperatures and product flow rates. Our teams size and analyze each unit to ensure it is perfectly suited to the project and the industrial operation for which it is intended. It should be noted that it is also possible to optimize the use of this type of chiller by recovering the preheated fresh air, which can then be used as drying air, preheating air, or secondary combustion air. This optimizes the overall operation of the installation. APPLICATIONS Mineral Industry • Cooling of calcined products exiting rotary kilns (oxides, metal concentrates, etc.). • Cooling of metal powders after reduction or annealing, under an inert atmosphere. • Cooling of mineral powders such as cement clinker or plaster (in cases where contact with air must be avoided). • Cooling of ceramic powders, calcined clays, quicklime, or refractory products. Chemical Industry • Cooling of calcination or exothermic reaction products (e.g., carbonates, sulfates, oxides). • Cooling under a controlled atmosphere of products sensitive to humidity, oxygen, or contamination. • Cooling of activated carbon, biochar, or solid residues from pyrolysis or gasification. • Cooling of hot ash or coal before handling or disposal. • Increased safety: prevents spontaneous ignition of still-reactive products upon contact with air. ADVANTAGES - No direct contact between the product and the cooling fluid. No contamination. - Controlled and homogeneous cooling, suitable for sensitive materials. - Increased safety for pyrophoric or reactive products. - Potential heat recovery from the cooling fluid (energy recovery). - Easy integration downstream of a rotary kiln or thermal reactor.