Frequency of adjusting flue baffles
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Hello everyone. Flue dampers are used to regulate negative pressure. I was wondering whether these dampers can be adjusted continuously, just like control valves – in other words, whether negative pressure and the operation of the flue dampers can be automated such that the dampers are adjusted at all times. Would doing this cause any damage to the dampers? After all, they are relatively large in size, and there is a risk of them getting stuck.
Running water doesn’t stagnate; movement prevents blockages :lol Adjusting a baffle is extremely simple – I just used a small gauge to fix it. For details: https://bbs.hcbbs.com/thread-1430414-1-1.html
Running water doesn’t stagnate; movement prevents blockages. Adjusting a baffle is extremely simple – I just used a small gauge to solve it. For details: https://bbs.hcbbs.com/thread-1430414-1-1.html
I’m not sure what kind of furnaces you have; ours control the negative pressure in the furnace by adjusting the frequency of the exhaust fan, and the damper valves are normally closed
Theoretically, it should be possible; it’s a good idea. I wonder if any organization has used it in this way?
The flue dampers should be fully open. Here, we also use the frequency converter of the exhaust fan to regulate the negative pressure in the furnace. As for the flue dampers, it’s hard to say; if they aren’t adjusted over time, they might get corroded and stuck! ! ! !
This post was last edited by ZhiGE on 2019-1-20 at 08:39. 1. Currently, negative pressure is used in the furnace chamber; especially in larger furnaces, variable-frequency exhaust fans are generally employed to regulate this negative pressure, which is more energy-efficient； 2. The flue damper can also be used to adjust negative pressure; a cylinder or hydraulic mechanism can be employed to drive the damper in order to regulate negative pressure, with PID single-loop control being used for this purpose ； 3. The adjustment effect of the flue single-board jamming is definitely poor, requiring frequent maintenance ； If you don’t want to make frequent adjustments, set a small dead zone so that no output is generated when the deviation remains within a certain range; at the same time, reduce the intensity of the PID control.
This is feasible, but it’s necessary to ensure that the precision of adjustment isn’t too high. Our company uses advanced control systems for adjusting flue dampers, and the results are quite good; however, this requires high standards for electric actuators and servo mechanisms
Under natural ventilation, flue dampers are used to control the negative pressure; if the smoke has a high density, an exhaust fan is required to regulate the negative pressure in the furnace.
Neither flue ducts nor shutoff doors are precision devices; using them to adjust minor negative pressures in real time is not a good approach. It’s more reliable to use variable-frequency control for the exhaust fans.
The adjustment of the flue damper doors is defective, resulting in unstable negative pressure. This involves the machining precision of the shutter doors, the machining precision and response time of the actuators, as well as the electrical sensitivity of the servo controller. Since the negative pressure is adjusted within a relatively narrow range, using an inverter-driven exhaust fan is the best choice. The prerequisite is that the baffle door must be in an appropriate position.