Waste Heat Recovery


Waste heat recovery.

Climate protection, resource conservation and cost-effectiveness are fundamental challenges for the glass industry. Waste heat recovery (WHR) systems are one of the few mature technologies that can target all these goals simultaneously. And that is our promise: the specialists from Grenzebach and CNUD EFCO GFT offer superior WHR solutions with significantly improved efficiency, still with the reliability you count on.

The process

Heat is an asset. You should make it earn interest.

The problem: during the glass melting process, much of the energy in the exhaust gas from the glass melting tanks is lost. WHR systems use this waste heat to generate electrical power, as well as heat and cooling energy for process and air-conditioning purposes.

This leads to a significant increase in energy efficiency, an improvement in the climate protection balance due to avoided C02 emissions, and considerable cost savings by reducing the amount of electricity and fossil fuel that has to be purchased.

Overview of benefits

Costs savings

WHR plants generate electricity and, if required, heat and cooling energy. The consequent reduced need to buy energy leads to significant cost savings. Incredible but true: the use of our WHR systems on standard glass melting tanks enables the generation of all the electrical energy required to operate the flat glass production line!

System integration and facility performance

Our WHR systems are exclusively equipped with proven technology derived from power plant construction. Their smart integration into the production process means that the glass manufacturing process remains almost unaffected. What’s more, there is a chance to achieve additional benefits by reducing operating or investment costs for peripheral equipment.

Achievement of climate goals

The European glass industry has committed itself to reducing CO2 emissions by over 20% by 2030, and the political pressure to achieve this goal will be even stronger in the future.
WHR plants from Grenzebach and CNUD EFCO GFT can make a real contribution here on the basis of a proven, controlled technology. They offer the highest efficiency, the highest electrical power generation rates and outstanding availability under almost all operating conditions.

Contact us

Talk with a specialist.

We can advise you on the new construction, conversion, or expansion of your glass plant, so that you are prepared for future climate protection requirements.

Discover our other processes

Grenzebach and CNUD EFCO GFT: a symbiosis that benefits you in so many ways.

The merger of CNUD EFCO GFT and Grenzebach combines all the system components that are essential for the glass pane in its final form. From the tin bath to the annealing lehr to the cold end and the transport of the finished product to the warehouse: now everything is available from a single source. As a glass manufacturer, you benefit from integrated high-tech solutions with reduced coordination effort – starting from synergies in design and engineering and extending to lifelong service and support from a single supplier.

Your advantages with CNUD EFCO GFT and Grenzebach:

  • Comprehensive technology integration
  • Strong, focused engineering
  • Reduced project management effort
  • Uniform control concepts, fewer interfaces
  • Intuitive operation of the glass plant

Overview of solutions

Tin bath

The tin bath is the heart of every float glass production line; it is a decisive quality factor. Consequently, at CNUD EFCO GFT, it is always tailored to each customer’s requirements. Using process simulation, we are able to extract the ultimate in yield and quality.

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Annealing lehr

The annealing process is a decisive factor for quality, productivity, and efficiency. With our innovative systems, you can keep it fully under control: the latest technological control applications monitor your process at all times, prevent production losses and help to minimize downtime. This way, they ensure a maximum return on investment.

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Service and support

Construction and commissioning of a new glass production line is only the first stage in a good customer relationship. Professional service in daily operation is just as important: We want your investment to be profitable without any interruption – that’s why our engineers are there for you with guidance and support over the entire life cycle of the plant.

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Since late 2019, CNUD EFCO GFT has been part of the Grenzebach Group, linked to it by common high standards of high-tech and quality. A large proportion of the flat glass produced worldwide passes through Grenzebach’s cold end – from inspection, cutting, snapping and stacking to transport. With the integration of CNUD EFCO GFT, the entire float glass production line is now available from a single source.

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