Mondelez Herentals, known for its LU cookies (Cent, Cracotte, Heudebert, Prince, Pim's, Tuc, Baudoir, Cha-cha, etc.), commissioned INDUSTRIUM to conduct a feasibility study of the possible heat recovery from the outgoing gases of the baking ovens.

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It was chosen to carry out this study on the Prince lines because on these baking ovens the outgoing gases have a temperature of about 225°C. Given the relatively limited flow rate per chimney, it was opted to bring all outgoing gases together first and only then provide a heat exchanger. After an in-depth study with extensive measurement campaign and pinch analysis, it was calculated that a thermal output of about 500 kW can be exchanged with water. The heat from this is used to heat up hot process water for the plant via a heat exchanger and buffer tank. On an annual basis, approx. 14,500 GJprim could be saved in this way taking into account the additional consumption of electricity.

The payback period for the project was around 3.5 years. Based on this study, an extrapolation could be made to apply this measure to the other baking ovens in the plant.