Principle of temperature and pressure reducer
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In a temperature and pressure reducer, the steam loses pressure as it passes through many small holes. What is the principle behind this pressure reduction? Is it the increase in v in pv=nRT? Is it still due to the resistance caused by the porous plate?
Isn’t pressure reduction achieved through control valves? Aren’t those small openings used for injecting water to cool things down?
A third-stage temperature and pressure reducer reduces the pressure and temperature of steam through three stages of porous plates, with water spraying being used for this purpose
The small holes should be located on the nozzle of the desuperheater; the desuperheating water enters the nozzle through these holes, and they facilitate the atomization of the water as well as more effective evaporation for cooling
It’s not on the nozzle. I think it might be that, according to Bernoulli’s equation, as the fluid passes through the orifice plate, its velocity increases and therefore the pressure decreases?
Cooling is achieved by spraying water in the direction opposite to the flow of steam from the nozzle
Thermodynamic pressure reducers are primarily used to recover heat and generate more steam; therefore, a control valve is usually installed on the cooling water to adjust the desired temperature or pressure. Simply put, the principle is based on P1V1/T1=P2V2/T2; this is mainly applied to superheated steam. The temperature and pressure of saturated steam are related to each other; therefore, a control valve is usually sufficient for saturated steam.
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