Change in volume after steam pressure reduction to 1.0 MPa
Thread Content
This post was last edited by sxf1028102800 on 2018-4-5 21:57. The device uses steam at 1.0 MPa at a rate of about 10 tons per hour; what would be the corresponding rate when using steam at 0.3 MPa? Thank you, points appreciated
The pressure of the steam to be used depends mainly on the operating temperature of the device being heated, with a heat transfer temperature difference of around 20°C taken into account. Saturated steam at 1.0 Mpa is at about 180°C, while saturated steam at 0.3 Mpa is at about 144°C; however, their latent heats of vaporization are similar, with the former being slightly lower than the latter. So as long as the above conditions are met, a pressure of 0.3 Mpa also results in a usage amount of around 10 tons.
So it’s probably not for pressure reduction; if the goal is to lower the steam temperature, then temperature and pressure reduction would occur, and the flow rate would increase
180/144 should be 1.25@_@@_@
Please let me know to what temperature the substance to be heated needs to be raised. Steam pressure is related to steam temperature; when heating, with the same heat load, the amount of steam required generally remains similar. However, the heat exchange area of the equipment plays a role – 3 kilograms of steam require a larger heat exchange area than 10 kilograms.
The original poster didn’t explain things clearly; it seems that it might involve taking 1.0 saturated steam, adding water to it and reducing its temperature and pressure to 0.3 saturated steam, and then performing heat transfer. Would the result be different in that case?
What about the steam temperature and the drain water temperature?