Cupola Flue Gas System

The exhaust gas created during the operation in thecupola furnace are conducted into the cupola flue gas system. In case of emergency or when the temperature of flue gas exceeds 360°C, the exhaust gas  is conducted into the atmosphere through an emergency chimney with the use of an ejector with a ventilator. Theflue gas is conducted by piping into a cooler located in front of the filter. The heat exchanger cools down the flue gas (by fresh air) or heats it up (by clean flue gas) in order to maintain the given constant temperature of combustion products at the filter input. Furthermore,flue gas is conducted by piping to the heat exchanger for preheating where the waste heat from the purified gas is used for preheating the combustion products. The preheating of combustion products minimizes the fuel consumption in the combustion chamber where the preheated gas is further heated to the required reaction temperature (820 – 860 °C) by burning carbon monoxide and natural gas. The cleansed flue gas is cooled by fresh air at the output of the combustion chamber to the required temperature of the blast air of the cupola furnace. The blast air is further distributed through an air duct and blowers into the fusing zone of the cupola furnace.

The entire system is designed for automated control and coo-peration with a visualisation system. All technologically important values (flows, temperatures, pressures) as well as alarms are displayed on the screen (Win CC). The system helps understand the process and simplifies the operation and maintenance.