I have a question about vapor pressure
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Design a condenser. Connected to him is a concentration tank, under the condition that water vapor at 95 degrees Celsius is condensed to water at 45 degrees Celsius. What is its design pressure? If you answer well, I’ll give you gold coins (although I’m not wealthy)
The water temperature is between 25 and 35 degrees
The defense is this afternoon; I’m not sure about myself. What about 0.2, 0.6, 0.9? ?
It should be a negative pressure design. This is a common issue with SPX ACC air condensate coolers. It refers to the waste steam generated after the turbine operates, which is condensed into condensate water; negative pressure design must be taken into account in the piping system.
The key points of negative pressure design also require consideration of the extraction and removal of unsaturated gases; otherwise, it will reduce work efficiency.
The designer’s design requires the addition of a device – a vacuum pump.
The saturated vapor pressure of water at 45 degrees is 9.6 kPa, and at 95 degrees it is 84.6 kPa. It is possible to operate under either of these two pressures: in one case, the superheated steam at 95 degrees is first cooled to 45 degrees, and then condensed into liquid water at 45 degrees ； The other is to condense 95-degree saturated steam into 95-degree liquid water, then cool it to 45 degrees ； This requires a condenser and a cooler. Generally speaking, it is reasonable to operate at a pressure of 84.6 kPa.
The saturated vapor pressure of water vapor at 95 degrees is taken as 0.1 Pa. Therefore, the design pressure is determined based on normal pressure and negative pressure conditions. Negative pressure occurs when steam condenses into condensate water, causing the pressure to drop significantly to a negative level.