How to deal with a fire in an vent pipe?
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In the new ammonia stripping urea production system installed in our facility, the outlet of the intermediate pressure vent pipe is located at the top of a 70-meter-high granulation tower; this makes it prone to catching fire during thunderstorms in summer. Could everyone please discuss how other manufacturers handle this issue?
As a supplementary note, a lightning rod has been installed on that vent pipe, but its effectiveness is poor.
That’s a great idea upstairs! :lol :lol :lol
The vent pipes in the ammonia stripping process are generally installed at a high altitude, making them prone to fire accidents during thunderstorms. Therefore, flame arresters are usually installed at the top of these vent pipes. Steam injection devices are placed after the P305 vent, below the vent cylinder, and before the vent pipe outlet; by increasing the amount of steam supplied in case of a fire, it is possible to suppress the fire. But under normal circumstances, a small amount of steam should be added to these areas where steam is introduced, in order to dilute the released gases and prevent them from becoming explosive (as the released gases contain oxygen).
Add a steam pipeline; it can be used to extinguish fires once they start
I agree with the view from the sixth floor; it’s the same in our factory as well. A steam pipeline is installed after the relief valves of various vent pipelines, and the steam control valve is opened in case of a fire.
The steam outlets of the steam jet pumps in stages 1 and 2 of the evaporation section are both connected to the vent main, which is used to dilute the concentration of flammable gases; in addition, an emergency steam pipe is provided.
Using steam; all of our factory’s air defense pipes are equipped with steam pipes.
Steam or nitrogen will work; be sure not to turn off the heat source, otherwise backflow will occur
Just increase the amount of steam. Our factory is the same
Add steam; I had to turn it off several times during the thunderstorm season