For steam heat exchangers, is it better to control the outlet or the steam inlet?
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For steam heat exchangers, is it better to control the outlet or the steam inlet? Is there any basis for this?
Generally, import is what is controlled; steam makes use of its latent heat, and the outlet cannot be controlled
The inlet is for gas and the outlet is for water; the outlet cannot be adjusted. There are established standards and experience regarding the use of steam, which require in-depth study*
But in our unit, several reboilers have their outlets under control, which is quite puzzling
I must have misunderstood. Sometimes, at the site, the steam volume cannot be increased, so the bypass of the drain valve is opened to increase the drainage rate; this should not be construed as control through the outlet
There is also control of the outlet; this control is achieved by adjusting the actual heat exchange area of the heat exchanger through changes in the level of the condensate water within the heat exchanger, thereby altering its heat load. However, this method is lagging behind control of the steam inlet.
If I understand correctly, in the aromatization unit, the reboiler of the pentane removal distillation column is used to control the return water flow