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The report concerns the investigation of a new continuous heat exchanger, which should be capable of preheating gases used in the steel industry to high temperatures (800 to 1000 C). After a comparative study of several devices at the development stage, the SEPR exchanger (a monolithic ceramic device with parallel channels) was chosen. Its thermal characteristics have been tested with a 0.7 MW power prototype. Two 100 hour duration reception tests were performed in order to verify that the measured performances of the exchanger are in agreement with the theoretical results. Unfortunately, in both cases, the runs had to be stopped prematurely because of serious leakage problems. Cold leak tests were subsequently performed which demonstrated the efficiency of the treatment. However, the structure deteriorated again during another reheating of the refractories and the study was stopped. Trials show that clean air (i.e. without any combustion products) can be reheated to a temperature in the range 850 to 900 C. Future developments of this technology can be expected, in association with the development of new refractory materials.

Additional information

Authors: BUFFENOIR M, Institut de Recherches de la Sidérurgie Française, Maizières-les-Metz (FR);GUILLAUME I, Institut de Recherches de la Sidérurgie Française, Maizières-les-Metz (FR)
Bibliographic Reference: EUR 13500 FR (1991) 81 pp., MF, ECU 4, blow-up copy ECU 7.50
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