How can high-pressure oxygen at 8.3 MPa be reduced to 4.2 MPa?
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Our company’s management currently has this idea: the large chemical plant has enough oxygen even when operating at full capacity; the oxygen produced there has a pressure of 8.3 MPa. They plan to supply oxygen at 4.2 MPa to the old system, while shutting down one small air separation unit to be used by the second-stage conversion furnace. The distance between these units is approximately 450 meters. How can this be achieved technically? Can direct pressure reduction throttling be used? Stabilize the voltage after depressurization. How to ensure safety?
I have two options for you: one is to install a pressure reducing valve made of Monel material. Careful attention must be paid to the pipeline installation process, as well as to degreasing and passivation of the tools used. I should also ask what the flow rate is; if it’s high, the throttling effect will be quite significant. You’ll notice severe frosting on the pipes downstream of the pressure reducing valve, while the pipes upstream will remain at normal temperature. Moreover, it’s likely that the valve won’t be able to handle such high flow rates, requiring the use of an expensive valve. The second option is to add a storage tank along with a pump and a vaporizer, or to modify the existing storage tank by adding pipes to connect it to the new pump and vaporizer. This is more reliable and safer compared to the first option, but it may require approval from regulatory authorities or similar bodies
Transport 6000 Nm3/h
Simply increase the regulating pressure relief valve to solve the problem. As mentioned above, the second option is safe indeed, it uses more equipment, and those related to pressure vessels require further evaluation. Liquid pumps also fall under the category of high-pressure pumps. Which is more suitable, an imported liquid pump head or an imported throttle valve? It must be the first method. And 6 thousand units of data traffic is quite a lot.
Just install a pressure relief valve and that’s it; it’s very stable. You need to buy an imported valve...
Why not use a flow-limiting orifice plate or plate array to reduce the pressure first, and then use a control valve? Please, experts, help me figure this out~!
It is possible to check the flow rate; if it exceeds the limit, it is recommended to use secondary pressure reduction~~
For safety reasons, after secondary pressure reduction, the fluid enters a buffer tank; a control valve is installed after the pressure regulator to automatically regulate the pressure in the buffer tank, and this control valve closes automatically when the pressure in the tank becomes too high. Of course, it is necessary to purchase valves and pressure regulators of high quality. It’s just my humble opinion.
I can’t speak casually about oxygen issues. I need to look up some information first. Safety is of primary importance; the metal particles generated by the operation of valves are combustible, especially in high-pressure oxygen environments, where when the oxygen flow rate reaches a certain level, it provides energy. If all three are present – combustible material, oxygen, and energy – the consequences will be severe! ! ! 1. The flow rate inside the valve must be controlled, by any means necessary. 2. Pay attention to the pipe material; the smoother, the better
The pipeline flow rate of oxygen is crucial; be extremely careful! ! ! ! !
When selecting a control valve, the manufacturer determines the valve diameter based on factors such as the medium, flow rate, pressure level, and flow velocity.