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Industrial Waste Heat Recovery
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One hundred fifty reports were reviewed along with interviews of some twelve recuperator manufacturers and research organizations. Of the reports reviewed, the consensus was that the majority of recuperators used in the U.S. are constructed of 300 and 400 series stainless steels which generally limit the recuperator temperatures to less than 1300oF. After reviewing the literature and from our discussions with recuperator manufacturers and research organizations, a general conclusion was that the upper material temperature limit of 1500oF is state-of-the-art for recuperators operating in an oxidizing environment produced by the com-bustion of Diesel No.2. A full size counter axial flow metal heat exchanger test module has successfully completed 50 test hours with exit temperatures of 1650oF and firing temperatures of 2050oF. Performance monitored during the tests was well within predicted limits. Less than 5 F circumferential temperature gradients were measured in the axial flow section of the test module. Also, reduction in thermal gradients across tube to header connection was achieved. Nine materials were tested in a 1700 F environment produced by the combustion of natural gas and Diesel No. 2 and also subjected to furnace oxidation tests. On the basis of these tests, promising heat exchanger tube alloys were identified. Eighteen materials, coated and uncoated, were tested in a water economizer environment below the acid dew point temperature produced by the combustion of natural gas and Diesel No.2. On the basis of these tests, promising low temperature heat exchanger tube alloys and coated surfaces were identified.
Ward, M. E.; Solomon, N. G.; Tabb, E. S. (1980). Industrial Waste Heat Recovery. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from