Galv-Est AS is known as one of the leading hot dip galvanizing companies in Estonia. Starting its journey in 2004, the company has grown to become a major player in the metal industry sector. A source of particular pride is their largest zinc smelter in the Nordic countries, which enables them to offer a wide range of high-quality services.
Galv-Est AS was faced with a challenge that is fairly typical in the hot dip galvanizing process: a large vacuum in the plant, created by the air being extracted from the zinc bath. The problem was not only the air flow of 45 000 m³/h, but also the fact that a significant amount of heat energy was lost in the process.
In addition, it was necessary to take into account the corrosive effects of zinc fumes and dust, which makes finding a solution even more complex.
Our solution was twofold: heat recovery and vacuum compensation. We chose a plate heat exchanger ventilation unit specifically designed with high heat exchange efficiency and specially machined elements to withstand the corrosive environment. Thanks to this device, it was possible to use the heat energy from the hot clay efficiently, even at temperatures as low as -25°C, without the need for additional heating.
In addition, we optimised the piping system by choosing stainless and acid-resistant materials to ensure long-term reliability.
The automation has been designed to synchronise the operation of the zinc bath and the fans in our system, ensuring optimal compensation of air volumes as required.
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