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CLINKER COOLER
Depending on its structure, the clinker grate cooler produces 1 - 2 Nm3 of exhaust air per kilogram of clinker. Under normal operating conditions, this exhaust air has a temperature of approximately 250 — 350° C, which can temporarily increase to 400 – 500° C under so-called upset operation. Insofar as the waste heat is not used in some other way – for a dryer, for example – a tubular heat exchanger is installed upstream of the filter because of the dry exhaust gas and for the purpose of cooling the gas. In this way, the temperature of the exhaust gas is cooled to the appropriate continuous temperature for polyester hoses (max. 150° C) or Nomex hoses (max. 180° C). The cooling of the clinker cooler exhaust gases flowing inside the heat exchanger tubes takes place using axial fans, which suck in ambient air that flows around the outsides of the cooling tubes. Important to the process is a carefully implemented control and safety concept, so that the heat exchanger can protect the filter bags by promptly reacting to upset operation.