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Thermal Sciences 2004. Proceedings of the ASME - ZSIS International Thermal Science Seminar II
June, 13-16, 2004, Bled, Slovenia

DOI: 10.1615/ICHMT.2004.IntThermSciSemin


ISBN Print: 978-9-61913-930-1

Experimental Thermal Behavior of a Power Plant Reheater

pages 447-454
DOI: 10.1615/ICHMT.2004.IntThermSciSemin.520
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要約

The process conditions and efficiency of power plant components subjected to high pressures and temperatures are essential to determine their remaining life and availability and the thermodynamic efficiency of the thermal cycle. These factors likewise affect production and environmental costs. It is therefore expedient to pay special attention to critical components such as: superheater and reheater heat exchangers, headers, and main and reheated steam lines. Several factors that result in damage or a loss in performance of the heat exchanger tubes are to be found in the literature. There are a number of factors that produce a decrease in thickness and even tube failure and others that foul tube surfaces. In the latter case, the heat transfer rate decreases and the temperature of the tubes increases. In this paper, on-line and off-line variables of a power plant reheater that has presented problems of thickness losses and repetitive tubes fissures are studied. The defects are located in both the straight and curved tubes. The fissures are associated with the effect of a thermal mechanism. Off-line measurements were taken of the following variables: pressure, temperature, velocity and composition of the gases. On-line instrumentation was completed by the installation of specific thermocouples to ascertain the temperatures in the reheater tubes outlet. Various angles for the fuel inlet of the burners and variations in the number and location of the working burners were also assayed. Representations of on-line variables versus time were used in the analysis of results. As a consequence of this analysis, it can be deduced that there are important differences in the outlet temperature of the reheater tubes that decrease for lower powers. Finally, it was pointed that a non-uniform distribution of the steam flow in the reheater might be the cause of the problem.

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