Are the furnace arch tubes convective tubes or water wall tubes?
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When calculating the strength of small vertical water-tube boilers, it’s a bit unclear whether to use the values specified in Table 4 of GB/T16508.3 for determining the calculation temperature – based on the requirements for water-wall tubes or those for convective tubes. I hope friends can help!
The furnace chamber should be selected based on the water wall tubes: firstly, because the furnace temperature is high and radiation heat transfer plays a major role; secondly, by choosing the water wall tubes with a higher wall temperature, the calculation results will be more reliable
It is recommended to calculate based on the water wall tubes, as the temperature under the arch is relatively high