The electric forehearth heating, also called forehearth boosting, is used to improve the glass quality / homogeneity. With specially designed molybdenum forehearth electrodes, the power will be inserted into the glass. For easier installation, the molybdenum electrodes are available with or without coating.
The forehearth electrodes are installed in the equalising section of the forehearth. A standard boosting installation consists of four electrodes per side / eight per forehearth, upon customers' request, other quantities are also possible. The electrodes have a diameter of 45 mm and the installation holes are cooled via air (cooling water is not necessary).
The boosting system consists of three main components:
To avoid any magnetic field disturbances / power losses, the transformers are located as close as possible to the forehearth. Each transformer has two secondary coils (2x20kVA) and is built inside a closed housing.
The transformers are connected to a thyristor power controller which can steplessly control the power. The cabinet is considered to control the boosting via a SCADA / PLC system or to control it by manual mode. For each electrode pair, the current and voltage will be measured and indicated individually.
EQS boosting system recommendations from HORN®:
HORN® standard EQS boosting system installation basics:
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