May I ask how the steam pressure may change when water is sprayed to reduce the temperature and pressure of the steam?
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May I ask how the steam pressure may change when water is sprayed to reduce the temperature and pressure of the steam?
Cooling and decompression are two processes, and decompression comes first, and dewarping comes last. Theoretically, the water spraying and decompression process has no effect on the pressure.
When the temperature drops during desuperheating, doesn’t the saturated vapor pressure also drop? During the decompression process, if the pressure drops, won’t the temperature also drop? ?
Steam is superheated, and there is no corresponding relationship between pressure and temperature as saturated steam.
The steam corresponding to the desuperheater and pressure reducer is generally superheated steam. The water entering consumes the heat of the superheated steam and there will be no phase change, so every time the pressure changes
Desuperheating means reducing temperature, and reducing pressure means reducing pressure. It is not a concept. During the cooling process, the pressure does not change unless it passes through the pressure reducing valve.
Steam decompression and temperature reduction are divided into two processes. First, the pressure is reduced through the pressure reducing valve. The steam temperature remains unchanged and the pressure decreases, which is manifested as overheating. The hot water sprayed from the outlet of the rear pressure reducing valve vaporizes and absorbs heat, lowering the temperature. The two streams of steam finally converge, and the temperature and pressure are reduced.
This picture is very detailed, first reduce the pressure and then reduce the temperature.
No impact, the pressure reducing and temperature reducing valve is a whole