How long does it take for fluid to accumulate in the cold box?
Thread Content
The compressor pressure at the outlet of the CO compressor in the cold box is 0.8 MPa. Is it possible to use this pressure to accumulate liquid in the cold box? How long will it take?
Personally, I think it’s a bit difficult again~! The pressure isn’t too high
I’m not quite sure what the question posed by the original poster means – how is it possible to accumulate fluid in a cold box using this pressure? I don’t know much about cold boxes; please explain in detail
Does the cold box need to accumulate liquid? The insulation material used in cold boxes is usually perlite; if water, liquid, or ice gets into the perlite, it will severely affect the cooling effect. Therefore, in air separation units, low-pressure nitrogen or contaminated nitrogen is generally used to pressurize the cold boxes, maintaining a slight positive pressure to prevent rainwater and water vapor from entering. Is this CO you’re talking about the gas used to maintain positive pressure?
It involves using low-pressure nitrogen, which is pressurized by a compressor, then sent back to the cryogenic tank where it expands due to pressure reduction through a throttle valve; finally, heat exchange is used to liquefy the nitrogen!
What kind of cold box are you? For air separation, pearlescent sand is generally used!
Does the cold box need to accumulate liquid? What is the purpose of fluid accumulation? Isn’t it bad to have fluid buildup?
I’m not quite sure what the original poster means; in a normal air separation process, high pressure can lead to faster accumulation of liquid.
The pressure is a bit low; it seems difficult to accumulate fluid, or it will take a long time. Are there any other sources of cold? Like liquid nitrogen? If this is the pressure during normal operation, it may not be possible to maintain a balance in cooling capacity, or if the volume of circulating air is too high, the equipment investment will be very high. So it is estimated that the compressor outlet pressure should be much higher than this.
It seems that pressure is a condition for fluid accumulation; does the original poster have any other parameters to provide?
The pressure is too low; the throttling effect is limited. It’s still faster to accumulate cold energy using liquid nitrogen.
The question is unclear; the answers are varied. Pressure is certainly important, but time cannot be determined by pressure. Increasing pressure facilitates the accumulation of liquid. Accelerate the fluid accumulation time.
If liquid nitrogen is added, will the pressure be higher than the outlet pressure of the compressor? Does the compressor need to be stopped?