The question of whether it is necessary to use a temperature and humidity regulator for steam
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Our steam temperature is 260°C with a pressure of 0.6 MPa; it thus constitutes superheated steam. The temperature of the steam returning to the system is 120–130°C, and its pressure is 0.19 MPa. The heating medium entering the reboiler has a temperature of 95°C, while its temperature at the exit is 110°C. Is it necessary to use a steam temperature and humidity regulator under these conditions? The amount of steam used is relatively high, at 14 t/h；
Give it a push – is there anyone who can answer?
This post was last edited by longziyun on 2020-4-10 at 13:50. A reboiler that uses steam as the heating medium takes advantage of the fact that the latent heat of vaporization of steam is much higher than that of surface sensible heat. The steam used in general steam piping systems is usually superheated steam, which has a high temperature, and this is done to ensure the safety of steam transmission (by reducing the risk of water hammer) ； The decision to install temperature and pressure reduction equipment is also based on process safety considerations, as well as the physical properties of the medium being heated; it is primarily aimed at preventing the medium from polymerizing, condensing, or coking due to excessively high steam temperatures, which could lead to blockages in the heat exchangers.
From a heating perspective, it is better to increase the temperature reduction for the following reasons: 1) At 0.6 MPa and 260°C, the enthalpy is 2978 kJ/kg; at 170°C, the enthalpy is 2783 kJ/kg； 14 t/h, 1 t/h needs to be sprayed, water at 60°C (enthalpy value of 251) ； The total amount of heating steam is 15 t/h ； 2) Although no additional heat is added, for heaters and reboilers, steam latent heat is primarily used for heating, and the heating efficiency resulting from latent heat is high. However, in the range of 260 to 170, a large amount of heat exchange surface area is wasted, resulting in very low heating efficiency.