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The cooling process shall be slow, and the cooling speed shall be generally controlled at about 50 ℃. It is necessary to ensure that the combustion of the well burner is normal, and the temperature of the outlet branch of the furnace and the furnace is evenly distributed. When the furnace temperature drops to about 3U0 ℃, open the flue damper and quick opening damper, change to natural ventilation, and stop the preheater and fan. The superheated steam shall be vented after relevant posts stop using it. Before the feeding pump of the heating furnace is shut down, the furnace will shut down. In order to facilitate the cleaning and oil return of the furnace pipe, after the flameout is completed, stop the nozzles in time to purge the steam, conduct the furnace closing operation, close the flue damper and natural ventilation valve, and avoid the furnace temperature dropping too fast.

 

 

 

When the well type furnace tube is not burnt, the fuel oil circulation shall be stopped and relevant units shall be contacted for fuel oil cleaning. After the cleaning, the furnace temperature shall be reduced below 150 ℃. It can fully open the flue damper and natural ventilation door, and timely ventilate and cool the furnace with fuel gas as required. The fuel oil system is steam purged. Pay attention to the fact that it is forbidden to blow fuel gas into the furnace after the furnace is fully flamed out. Detection of blast gas in the furnace. Stop blowing steam into the furnace, contact the laboratory to analyze the blast gas in the furnace until the analysis is qualified, and continue blowing steam if it is unqualified.