Abstract
The thermal behaviour of a multipass process gas heater has been investigated using the zone method of analysis, with the aim of estimating the accuracy of previous predictions based on an extended two-flux model of the radiation field. Process gas, furnace gas, tube surface and refractory surface temperature distributions predicted by the two methods are found to agree well with each other and with the limited experimental data available for the heater. Good agreement is also found between the radiative flux densities calculated using the two-flux model and the zone method. Due to the well established accuracy of the zone method of analysis, the closeness of the two sets of predictions indicates that the two-flux model should prove extremely useful in assessing the thermal effects of changes in design or operating conditions in process gas heaters, particularly because of its computational simplicity compared with the zone method.
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