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R AND D ON HEAT PUMPS FOR HEAT RECOVERY FROM PAPER DRYER EXHAUST AIR, PRODUCING PROCESS STEAM

Ziel



DIFFERENT POSSIBILITIES HAVE BEEN STUDIED TO PRODUCE HEAT AT 125 - 145 DEGREES C FOR A PAPER DRYER FROM ITS WASTE HEAT AT 80 - 90 DEGREES C. A COMPARISON OF THE POSSIBLE SYSTEMS WAS MADE REGARDING TECHNICAL FEASIBILITY, ENERGY SAVING POTENTIAL AND COSTS. THE TWO-STAGED ABSORPTION HEAT PUMP WITH LIBR/H2O WAS FOUND TO BE ABLE TO WORK UNDER THE SPECIFIC OPERATING CONDITIONS OF THE REFERENCE PAPER MACHINE. A 100 KW HEAT PUMP OF THIS TYPE WAS BUILT AND TESTED ON A TEST RIG. AS A RESULT OF THESE TESTS THE FOLLOWING MODIFICATIONS ARE BEING BROUGHT ABOUT :

- INSTALLATION OF A PUMP TO CONTROL THE SOLUTION AND AVOID CRYSTALLIZATION OF LIBR

- CONTINUOUS MEASUREMENT OF THE LIBR CONCENTRATION

- DESIGN OF A NEW LIBR SOLUTION DISTRIBUTION SYSTEM

- REPLACEMENT OF THE SOLUTION HEAT EXCHANGER BY A NEW APPARATUS WITH LOW LOSSES.

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Battelle-Institut eV
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Am Römerhof 35
60486 Frankfurt am Main
Deutschland

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