Why is the medium-pressure steam temperature 321 degrees? How to understand it? Key topic of discussion this week! ! -wsl01218
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This post was last edited by WSL01218 on 2010-10-19 at 11:08. Our design for medium-pressure steam is: pressure of 38.3 KG/CM2, temperature of 321 degrees. A pressure of 38.3 KG should be sufficient to meet the process requirements as well as to drive the turbine. But what about a temperature of 321 degrees? ? ? Even when 50 degrees is added, the superheat remains at 300 degrees; naturally, a higher steam temperature leads to better turbine performance. So why is it 321 degrees instead of 340 degrees or even higher?
The saturated steam temperature corresponding to 3.83 MPa should be a little over 240°C; the fact that the superheated steam is designed at 321°C is likely related to the design of the boiler’s superheating section. That’s what I think, though I’m not sure if it’s right
According to the temperature-entropy diagram of the Rankine cycle, the temperature of the superheated steam should meet the requirements regarding the dryness of the waste steam after expansion and work performance; generally, a dryness level of greater than 0.9 is required. Higher temperatures do help improve thermal efficiency, but it may be limited by factors such as the boiler material.