The importance of a heat recovery capability on
thermoprocessing systems for increased cost-efficiency is rising
steadily, along with energy costs. Accordingly, an increasing
number of methods for recovering heat from exhaust gas have
emerged in recent years, and the processes in question are being
applied to ever more fields. For a plant-related assessment of
diverse exhaust gas heat recovery solutions from an economic
and/or process engineering viewpoint, it is imperative to
analyze the plant-specific energy flows and to present the
resulting findings in a clear-cut manner. On the basis of this
analysis it is then possible to perform a plant-related evaluation
and selection of the most suitable heat recovery method.
The present article describes a method that facilitates an
economic assessment of the heat recovery potential of
thermoprocessing equipment while also permitting a
comparison of the plant-specific savings potentials for a given
heat recovery process. To this end, a thermodynamic model is
first developed to analyze the plant-specific energy flows; this
model then enables us to compute these energy flows on the
basis of process data. It is further shown how the results are
presented in a clearly structured fashion to serve as the basis for
further investigation. Next, it is explained how suitable heat
recovery solutions can be selected for various equipment results
and how the associated savings potentials can be determined.
The method is applied, by way of example, to the dataset of an
industrial furnace and the results obtained are discussed.
It is shown that the method permits an economic evaluation
of diverse heat recovery solutions for different plants in day-today
operation. In addition, the data analysis provides a capability
to detect defective equipment components and unidentified
Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .