Vent fan inlet bypass valve
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The flue gas extractor is malfunctioning, and the flue gas is flowing directly through the double-acting slide valve. What is the purpose of this manual bypass valve?
It’s used when there’s a problem with the smoke extractor. Dude, be sure to turn on this valve so that the smoke can circulate, and keep the temperature of the smoke above the temperature at which corrosion occurs due to dew point. This can be calculated; if it’s not possible to calculate it, I personally recommend 200. Furthermore, the flue gas flowing through this area can carry away the catalyst dust, preventing a large amount of such dust from entering the flue gas system when it is restarted after repair, thus avoiding unnecessary problems. Personal opinion.
This line is the dew point corrosion prevention line for the smoke extractor inlet, and it is activated in case of a fault with the smoke extractor.
Typically, there are two bypass valves, which can be either slide valves or butterfly valves. One is the main bypass valve, with a larger diameter; it is opened only during startup or when there is a malfunction in the smoke extractor. There is also a smaller bypass valve that remains open at all times for regulation purposes.
What was said upstairs isn’t the key point; the bypass usually has a diameter of DN300 or DN350, and it is primarily used when warming up the exhaust fan. It is also possible to control the smoke extractor to operate at a low speed while its counterweight is being adjusted online. Is the poster referring to the bypass valve next to the range hood inlet? Is it the valve on the flue that is called the heating pipeline? This post was last edited by chengkang on 2009-3-25 19:25]
There are 2 bypass valves in front of our flue extractor; one of them leads directly to the chimney. I used to think they were only used to purge the catalyst accumulated in the inlet pipes before starting up the equipment, but it turns out they have another function as well. Another one is the warm-up valve
1. For protecting the smoke extractor in case of an accident. . . 2. Range hood warm-up wire. . . 3. Prevent steam condensate from accumulating beneath the flue gas duct pipes, thereby avoiding dew point corrosion of the pipes, equipment, valves, etc. . .
The manual bypass valve is also a secondary valve of the waste heat boiler, which can isolate the waste heat boiler.
Be sure to remember to open this valve to allow smoke to flow, and control the smoke temperature so that it does not drop below the temperature at which corrosion occurs due to dew point. This can be calculated; if it’s not possible to calculate it, I personally recommend 200. Furthermore, the flue gas flowing through this area can carry away the catalyst dust, preventing a large amount of such dust from entering the flue gas system when it is restarted after repair, thus avoiding unnecessary problems.
It is mainly used during the engine warm-up
Didn’t you just say it? It’s the bypass for the flue gas system, which serves to prevent pressure buildup in the regenerator. Without such a bypass, there would be no outlet for the flue gas, and the device would be very dangerous. The purpose of this bypass is indeed to prevent pressure buildup of the flue gas
I agree with the original poster’s view. After the flue gas extractor is shut down, it is essential to prevent dew point corrosion. Additionally, catalyst can accumulate in the inlet pipelines of the flue gas extractor, and once the equipment is restarted, this catalyst will flow into the extractor, causing problems!