Is it necessary to install a low-point drain at the end of the air preheater? ? ?
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To improve the thermal efficiency of the heating furnaces and reduce energy consumption, air preheaters and waste heat recovery systems have been installed in the main units of refineries, such as atmospheric and vacuum distillation units. The question is whether condensate will form as the flue gas temperature decreases, and whether it is necessary to install a low-point drain at the end of the air preheater. If it is to be set up as a negative pressure system here, how should it be configured and what type should be used? ? ? I earnestly request advice from those who are more knowledgeable; I hope fellow netizens can share their insights: handshake
Thoroughly recovering waste heat, raising the temperature of the air fed into the furnace as much as possible, reducing flue gas temperatures, and thus saving fuel consumption have become an inevitable trend. As a result, the likelihood of dew point corrosion and condensate formation increases significantly, becoming an issue that must be addressed. Personal opinion: handshake
Personal opinion: To avoid dew point corrosion, there is no need to install a backflow preventer under normal conditions
There is no need to add a backflow preventer; I’m not sure which part the original poster is referring to where condensation might occur. In my opinion, there is no need to drain the water
There is no need to add anything; the corrosion is not very severe. Moreover, there is a negative pressure inside the heat pipe, and it is sealed properly after leaving the factory. Once you set up a drain point, how will you restore the negative pressure? Does your facility have the necessary equipment for maintaining negative pressure? Generally, there isn’t!
Furnaces with a smoke exhaust temperature below 130 degrees hardly exist; water molecules and the like remain in gaseous form, so there is no need to install a vent valve.
If any, it certainly refers to the end of the air preheater. Air preheaters usually have a low-point drain at the end, and it is relatively large, appearing to be DN80 in size. :Handshake personal opinion: hug:
Each family is different. Our air preheaters often experience condensation, and the problem is severe enough to even erode the flue lining. Therefore, I personally believe it is highly necessary to take measures to deal with this portion of the condensate.
Our hydrogen production plant’s air preheater is equipped with a low-point drain at its end; we use a drain valve with a diameter of 20.
A drain is added at the inlet of the exhaust fan; the inlet of the standby exhaust fan is a dead zone where water tends to accumulate in winter.
What kind of device is it, and what is the exhaust temperature?； What measures have been taken and what has been the outcome? I hope for more communication and exchange. . . :handshake