Why are two boiler supply fans designed?
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Moreover, there is a connecting pipe between the outlet pipes of the two fans; I think it’s not just for switching to a backup unit! Please discuss it.
Could it be that the resistance is too high? The original poster has provided too little information; please be more specific.
LZ is referring to that type of boiler; it would be best to send a picture. Our boiler has three fans: one for primary circulation, one for secondary circulation, and one as an exhaust fan
One in operation and one as backup, with the other unit starting up when one of the fans fails.
For hydrogen production, the top-fired furnace blowers are operated in one while the other is on standby; each hydrocracking furnace has one blower. There are quick-opening dampers in the emergency air ducts for the blowers, and emergency bypass interlock valves in the flue ducts of the blowers lead to the chimney.
Used for backup and maintenance; generally, two of them are not used at the same time
Similar to the view on the 4th floor, one unit is in use while another serves as a backup, to prevent failures in the exhaust fans from affecting the normal operation of the boiler.
The poster provided too little information; I think it’s probably just a backup unit, or one that gets activated when one exhaust fan is not sufficient.
It’s clearly a backup in case one unit fails; if air cannot be supplied to the inside of the boiler in a timely manner, the consequences can be severe
One in use and one as a spare; the intermediate pipe is normally closed off. The middle blind flange is opened only when the fan fails.
Depending on the boiler capacity, it is also common to install two exhaust fans.
Fluidized bed boilers are equipped with primary air, secondary air, and high-pressure fluidization air; a pressure booster fan may also be required if necessary. High primary air pressure is required
It is mainly to prevent uneven temperature field distribution in the flue channels on both sides. At the same time, to prevent the boiler from failing to operate in the event of a malfunction, it is designed with two units
As the boiler load varies, so does the amount of coal burned; consequently, the air volume also changes. Therefore, the fan switches between the minimum and maximum air volumes, which is a necessary condition for adjusting the boiler load.