Flue damper opening and furnace negative pressure
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This post was last edited by lijianhuai on 2012-3-3 at 12:59. What range is generally used to control the opening degree of the flue dampers in your installations? What about the negative pressure value in the furnace? Could you talk about your usual operational experience?
Here, all the flue dampers are closed because an exhaust fan is being used. The negative pressure value in the furnace chamber is around -3. Negative pressure has specified parameters during design, and during production it is slightly adjusted according to the flow rate. Based on past usage, the longer the production time, the more sulfide crystals form around the flue dampers, which affects their operation.
The negative pressure value in the furnace chamber is around -3. The operating conditions are quite stringent; it’s possible to end up with positive pressure
The negative pressure in the furnace of our equipment is generally between -40 and -90; it should not be set too low, otherwise positive pressure backfire can cause injury.
Many books state that the negative pressure in the furnace should be kept below 30 mmH2O. I’ve tried it myself, and it definitely burns your eyebrows; I wonder if those experts who write these books have actually tried it in practice. Anyway, our company requires the pressure to be around -80 kPa, which is quite good!
The -3 on the 2nd floor is so scary! Is it that accurate? Also, I’m not sure what kind of device the original poster is referring to, as the negative pressure in the heating furnaces varies depending on the device. In our coking plants, the negative pressure in the heating furnaces is generally around -90, and sometimes it reaches -110. The negative pressure in the small heating furnaces used for hydrogen production is around -30, while that in the hydrogen conversion furnaces is around -70. As for the heating furnaces and reboilers used in hydrogenation processes, I can’t remember exactly, but it’s likely between -30 and -50, since the load isn’t very high.
1# huangtao5108 The negative pressure in the furnace chamber should be determined based on the actual operating conditions and workload of the heating furnace. During the reaction heating phase, the gas flow rate and negative pressure also need to be adjusted according to the specific heating rate. Not all furnace operating parameters can be applied directly; this requires gaining experience through regular work.
The negative pressure at the top of the furnace radiation chamber is generally maintained at around -60 Pa.