Temperature of secondary steam in forced circulation evaporation
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In forced circulation evaporation, secondary steam is generated once the material boils after being heated by steam. Assuming the boiling point of the material is 110 degrees, what is the temperature of this secondary steam: the temperature of the material or the temperature of saturated water vapor at that pressure? How does the temperature of the steam change as it enters the next stage?
In forced-circulation evaporation, the temperature of the secondary steam is usually the same as the boiling point of the material, which in this case is 110 degrees. Since secondary steam is generated directly from the boiling material, its temperature should be equal to the boiling point of the material. When the secondary steam enters the next stage, it may experience a certain degree of cooling or heating, depending on the operating conditions of that stage as well as the design and efficiency of its heat exchangers. If the next effect operates at a lower pressure, the secondary steam may partially condense to release its latent heat. However, generally speaking, temperature changes are not significant unless special heat management measures are employed. .
Gas-liquid equilibrium includes pressure equilibrium and temperature equilibrium; therefore, the temperature is 110 degrees.
The temperature of saturated water vapor at this pressure
Each case should be analyzed on a case-by-case basis; the ASPEN software can be used for specific calculations
This indicates that there won’t be more than 3 in this forum; the temperature is slightly higher than that of saturated steam under such pressure
That can’t be right. . . Solutions have a boiling point elevation; if the temperature of the solution is 110°C, then the temperature of the secondary vapor should be below 110°C. In a project I worked on earlier involving a highly concentrated NaOH solution, the temperature of the solution was 70°C, while the temperature of the secondary vapor was only 45°C℃