Can nitrogen be used for fire suppression in hydrogen reactors?
Thread Content
I would like to ask the fellow sailors here: since steam is used for fire suppression at the inlet and outlet of the hydrogenation reactor, can it be replaced with nitrogen for fire suppression?
I’ve only heard of a steam protection ring; I’ve never heard of a nitrogen protection ring. Low-pressure nitrogen pressure: 0.6; steam pressure: 1.0. Nitrogen is more expensive in terms of cost, right?~~~
It should be possible; both the torch system and the heat transfer oil system are under nitrogen protection
Personally, I think steam is effective for extinguishing fires; on one hand, it has high pressure, and on the other hand, the water formed by its condensation also contributes to extinguishing the fire
Personally, I think steam is effective for extinguishing fires; on one hand, it has high pressure, and on the other hand, the water formed by its condensation also contributes to extinguishing the fire
Pressure (nitrogen is generally at a low pressure of 0.6–0.7, while steam is at 1.0–1.1). The continuous application of pressure, costs, the impact on other devices when used in large quantities, and the safety conditions in the surrounding area after extensive use – all these factors, in my opinion, should be taken into consideration.
No, the principle of nitrogen fire suppression lies in suppressing or isolating air; it is commonly used in enclosed or semi-enclosed containers, such as in cases where ferrous sulfide undergoes spontaneous combustion in reactors； The principle of steam fire extinguishing is that saturated steam turns into superheated steam, absorbing a large amount of heat thereby reducing the temperature of the burning material below its auto-ignition point, thus achieving the purpose of extinguishing the fire.
Moreover, nitrogen and air have similar molecular weights; using nitrogen to extinguish fires at the inlet and outlet of the reactor does not achieve the effect of isolating air.
It’s different; nitrogen is used in heat transfer oil and flare systems to isolate air and prevent the formation of explosive mixtures. This has nothing to do with fire extinguishing at all
All the hydrogenation units seen had steam fire suppression rings installed at the reactor head and the hot high-pressure section head manholes. The reasons for this can be roughly as follows: 1. The steam pressure is generally higher than that of nitrogen, and its supply is also abundant, meaning there is a sufficient supply available. 2. Steam has a lower density than air, making it easy to cover the source of fire and suffocate it out. 3. Nitrogen is an inert gas that can cause suffocation. 4. Nitrogen costs 400 yuan per ton, which is more expensive than steam, yet it occupies less volume than steam. 5. Steam needs to be protected from freezing in winter, while nitrogen does not.
The nitrogen temperature is low; could it be that the temperature of the flange where there is a leak has dropped suddenly, resulting in an even larger leakage amount?