Foundry furnaces

• Induction melting furnaces air extraction
• Gas melting furnaces air extraction
• Recommended device: CARM GH, heat exchangers

Metal melting produces exhaust gas fumes with carbon dioxide, water vapor, nitrogen, oxygen, carbon monoxide, nitrogen oxides and many more components. The exhaust fumes however also contain solid components, such as cinder, slag and fly ash. Our filtration devices are capable of filtering both solid and gas fumes, while keeping emissions under legal limits. Metal-melting flue gas filtration is an integral part of this process.

Contemporary induction furnaces are equipped with a removable lid, which uses two modes of air extraction. When the lid is closed, the furnace is used for melting. At this moment, minimal exhaust power is being utilized in comparison to when the lid is open. Automatic flaps in the air ducts are used for exhaust power regulation. Frequency convertor is used for regulating the power of the fan based on the negative pressure in the exhaust ducts. When the lid is open, the system turns on maximum exhaust power. At this point, it is necessary to extract all smoke and prevent it from spreading into the workspace. Induction furnaces do not increase humidity of the extracted air, which is why the CARM GH filtration device is not insulated.

We always follow operational values provided by furnace manufacturers when choosing gas furnace air extraction. The extraction system directly affects efficiency of the melting furnace. Flue gases produced by the furnace reach temperatures of 300 – 400 °C, which is too hot for filtration, so they are cooled down to app. 120 – 150 °C. To regulate flue gas temperature inside the filtration device or a heat exchanger, we blow in air from the surrounding environment. A heat exchanger is placed inside the extraction device to remove some of the flue gas thermal energy. The exchanged thermal energy can be used for central heating or for water preheating. Gas furnace flue gases are kept at minimum temperature of 90 °C and the whole filtration system is thermally insulated to prevent water condensation.

Smart exhaust power control is a mandatory requirement for melting furnace air extraction. The filtration system must accurately maintain steady levels of negative pressure on the melting furnace. It also must feature security measures against electrical power outage and compressed air insufficiency. Our top of the line devices record and store operating data, so the performance of CARM GH device can be analyzed with time. Our contemporary devices are also equipped with a GSM module for remote control and parameter setup.

We design and deliver our solutions for our clients with minimum filtration device maintenance cost in mind. Our devices are equipped with smooth filtration sleeves made of microporous filtration fabric. Filtration sleeves won’t create deposits, don’t tear and have high mechanical resistance. For melting furnaces applications, we guarantee filter medium service life of at least 20 000 hours.

We design and install all solutions ourselves and with our own products. We are 100 % liable for our finished solutions. We strive for high-quality, energy-saving air extraction solutions. We focus on low operating costs and long operating life of filter medium.