(57) An apparatus for converting the waste heat from a production process into electrical
energy, whereby the production process comprises a number of sub-processes, in which
the waste heat from at least two sub-processes is simultaneously extracted from the
production process by a single closed work-producing cooling circuit (1), and in which
there is at least one heat exchanger (3,4) for each sub-process in the form of an
evaporator, with a primary section incorporated into the closed cooling circuit (1)
and a secondary section through which a fluid is taken from the sub-process concerned
to evaporate the coolant in the closed cooling circuit (1), whereby at least one of
the aforementioned heat exchangers (3,4) has its secondary section incorporated into
a cooling circuit of a sub-process that uses the same coolant, and such that after
cooling in the heat exchanger concerned the coolant is mixed with the coolant in the
closed cooling circuit by means of a mixer (11) followed by a closed mixing vessel
(12) in which the fluid and gas phases of the coolant are separated, and there is
a closed mixing vessel (12) in the closed cooling circuit (1) after the mixer (11)
in which the liquid and gas phases of the coolant are separated, and coolant is tapped
off from this for use in the aforementioned cooling circuit of the sub-process.
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