After the heating furnace is ignited, the temperature inside the furnace rises rapidly, but the temperature at the furnace outlet does not change much. What causes this?
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After the startup cycle is back to normal and the heating furnace is ignited, the temperature inside the furnace rises rapidly, but the temperature at the furnace outlet does not change much. What is the reason for this? How should it be handled?
Check whether there are significant fluctuations in the quantity of raw materials and if there are any changes in their properties; the reasons are mainly analyzed from a process perspective.
It should be normal. Since the furnace is cold at the moment of ignition, more heat is absorbed by it; moreover, as the thermocouples are located directly above and below the radiation chamber facing the flame, the reaction occurs rapidly, resulting in a fast increase in temperature. The temperature at the outlet of the pipeline reflects the temperature of the medium. When the medium is in a cold state and there are no other heat sources during circulation, the heat supplied by the furnace is relatively limited; therefore, the temperature at the pipeline outlet changes slowly.
This post was last edited by dongjiang1001 on 2011-10-9 at 19:40. Reply: 4# wsm1988 explained it in great detail; it’s very clear. Thank you!
This post was last edited by zgj2405 on 2011-10-20 at 17:26. The furnace temperature refers to the temperature of the flue gas; as for the temperature at the furnace outlet, it’s not clear whether you mean the exhaust gas temperature or the temperature of the medium to be heated. There is a significant difference between these two temperatures, both when the furnace is just started up and during normal operation, with the exhaust gas temperature being much higher than that of the medium.