Does the temperature of a saturated steam pipeline drop after being depressurized by a pressure reducing valve?
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I would like to ask the experts: does the temperature of saturated steam in a pipeline drop after it passes through a pressure reducing valve?
There are posts on the forum; just search for it and learn about it. In my understanding, when the pressure is reduced, it drops sharply, while the temperature doesn’t change much; saturated steam then turns into superheated steam
Your understanding is correct; those who know Aspen can simulate it
The actual situation is exactly as you thought, because the temperature and pressure of saturated water vapor are related through a functional relationship; in fact, the phase diagram of water makes it easier to understand. On the vapor line, the test value is monotonically increasing with the logarithm of pressure. Furthermore, in many devices, high-pressure steam is introduced, and steam at a lower pressure is obtained through a steam pressure reducing valve, with its temperature also decreasing.
When the gas is depressurized, it doesn’t follow the CO line; instead, it stays in the gas phase area below that line, with the superheat increasing as one moves further away from the CO line
When a gas expands and does work, its internal energy decreases; this inevitably leads to a drop in temperature and the formation of condensed water