Regarding the temperature of the steam
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Everyone, I suddenly thought of a question today: Is the temperature of superheated steam affected by pressure? For example, with 1.0 MPA steam – the type of superheated steam that we are familiar with, whose temperature is generally around 240 to 250 degrees – is it possible to continue heating it to raise its temperature further? (The pressure should increase, but let’s ignore that for now.) My question is this: just as the boiling point of water is determined by pressure, if I want to produce steam at high pressure, would I not be subject to any pressure constraints? Could I simply keep heating the steam?
Water vapor decomposes when heated to a certain temperature, and only by reaching the saturation temperature at that pressure can water vapor attain its corresponding pressure; therefore, there is definitely an upper limit to water vapor pressure
10 kilograms of superheated steam usually results from the depressurization of 35 kilograms of superheated steam; this pressure depends on the steam pressure requirements of the user after depressurization, and it is primarily used in steam injectors behind turbines, depressurized gas extractors, and wastewater stripping processes without side streams. While meeting these requirements, the steam pressure should be as low as possible; we primarily reduce the pressure by using turbines to generate electricity, as a lower pressure allows for more electricity to be produced.
In other words, if I want to heat water vapor to a certain temperature, I also need to ensure that it is under a certain pressure, right?
It is the increase in temperature that generates pressure; it’s not the rise in pressure that causes the temperature to increase. In a closed system, as the temperature rises, pressure is also generated
So, in that case, inside a sealed container, as long as there is enough heat, steam at any pressure can be generated?
I believe that as long as there is enough heat, the container can withstand the appropriate temperature and pressure; in theory, steam at any pressure can be generated. ------If such equipment were available in the hazardous chemicals warehouses in Binhai, Tianjin, an explosion would be confined to within the warehouse itself, and there would be no risk of any external impact.
I remember that in college, my professor of thermodynamics talked about this issue; it was around 2008. With my skills at that time, I could only work with steam at a temperature of around 500 degrees. After starting work, I didn’t come across this issue again, so I’m not sure exactly what the temperature is
Actually, I just want to figure out one thing: the steam produced by our medium-pressure drum has a relatively low temperature. I want to understand whether this low temperature is related to the pressure of the drum
Since it is superheated steam, it is independent of pressure; as long as the temperature does not reach the decomposition temperature of water, it can theoretically be raised to very high levels. In fact, due to limitations in the material of the equipment and the processing conditions, it is not possible to increase it indefinitely.
Generating superheated steam! It depends on the degree of overheating; for a atmospheric pressure tower, the steam injection temperature is 400 degrees with a pressure of 0.3 MPa