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Glass Production


Glass is a material that is used in many forms throughout the world, and the market keeps increasing. Heat is widely used in this industry and it is possible to recover heat from various processes involved in the production of glass.

Heat Recovery and Mechanical Chimney Draught Control in Glass Tempering Lines

Glass is tempered to make it more durable and tempered glass is about four times stronger than regular glass. This is mostly done using tempering ovens and lines, and it requires very high temperatures. The glass is heated to temperatures above 600°C and it is inevitable that heat is wasted in this process.

Fortunately, the excess heat in the flue gases from the tempering oven and the glass tempering process can be recovered with exodraft’s heat recovery system. The recovered heat can be stored in a hot water tank and used for various purposes.

The heating process – and the entire tempering line can be equipped with exodraft’s mechanical exhaust fan technology / chimney draught, which optimises the chimney draught and reduces fuel consumption.

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Heat Recovery and Mechanical Draught Control for Crucibles

Different raw materials are required to produce different types of glass and the raw material is stored in a crucible. The crucible is most often heated using gas fuel and reaches a temperature of approx. 1500°C. The flue gases from the melting process are a good source of waste heat energy that can be recovered and recycled.

exodraft’s heat recovery system is used to recover heat from flue gases discharged through the chimney. The flue gases are passed through a plate heat exchanger that converts the waste heat into hot water, which is passed on to a hot water tank for storage. This hot water can be used for various purposes.

At the same time, exodraft’s mechanical chimney draught technology can reduce fuel consumption without compromising the quality of the process.

Our team of experts can analyze and calculate the value of the recovered heat and opportunities for energy optimization in the cement industry.

Heat Recovery from Post-tempering/Quenching

Post-tempering or quenching of glass after tempering or after melting emits a great deal of heat. The heat generated from the cooling of the glass can be absorbed and recovered using exodraft’s heat recovery system and passed on to a hot water tank.

Before the installation of such systems, inspections and analyses are carried out to evaluate the heat recovery potential, and solutions will then be designed, the energy savings calculated and the payback period of the entire heat recovery project can be established.

The hot water produced by the heat recovery system can be used for activities such as cleaning, bathing water and heating, and if there is more surplus heat than the company itself can use, it is usually a possibility to sell it to the district heating system.

If a lot of cooling is required, the excess heat can be used in absorption coolers to conduct the cooling. exodraft’s heat recovery technologies are state-of-the-art and easy to use. And they can be remotely monitored via exodraft’s Trendlog. Here you can keep track of energy consumption and energy savings for different processes, etc.

Have our team of experts pay you a visit and together, we can look at the potential for heat recovery and the possibilities of reducing your energy consumption and CO2 emissions.

    Fill out this appraisal form to clarify your heat recovery potential:

    How do see your recovered heat being used (you can select multiple options)?
    Transferred to the district heating systemUsed in production processesHeating of factory, warehouse or office premisesUsed for apsorption chillers/refrigerationHot water for bathing facilitiesAir curtain & air heatning systemsHot warter for general cleaning/washing purposesOther