Saving energy and preventing CO2
The process is as follows: the ceramic sanitary appliances are fired and given their final shape and strength in the tunnel kilns. A temperature of around 1,200 °C is required here. A ceramic sanitary appliance passes through the kiln in 15 hours on average. What is special about these tunnel kilns is that they are in operation 24 hours a day throughout the year, apart from certain days required for maintenance. The firing process contributes to around two-thirds of the entire energy consumption in the ceramics plants. The firing procedure in the kiln involves different temperature zones, with the hottest temperatures seen in the middle. In order to optimise the energy consumption, the kilns were fitted with new burners that have a significantly higher level of efficiency. Moreover, part of the warm air that is channelled off during the cooling process is reused in the pre-heating zone and in the firing process in the centre of the kiln.
This is an exemplary project in demonstrating how energy can be saved and CO2 emissions prevented.