346
A lot of material can undertake in rectification tower distillation departs, this also included air among them, place its in rectification tower, after passing a series of rectification working procedure can preparation gives liquid nitrogen. The rectification process of this and other material does not have what different, but those who make a person curious is, this need installs subcooler in rectification tower, do you know what reason this is?
When because be in the liquid of saturated condition,passing throttle, its corresponding saturated temperature is met as pressure reduce and reduce, so partial liquid will aerification. Visible, constituent of the pressure of the aerification rate of reduce expenditure and reduce expenditure around, liquid and degree of supercooling have particular concern. Normally the circumstance falls, not the aerification rate after reduce expenditure of the liquid nitrogen when super-cooling is higher, this makes on the circumfluence fluid quantity of the tower decreases, to going up the rectify of the tower is adverse. To reduce reduce expenditure aerification to lead, this ability thought of to want to install subcooler, it can make the thermal drop of liquid nitrogen small, reduce the aerification rate after reduce expenditure eventually. On the other hand, the installs OK and contractible reversing heat exchanger Leng Duan difference in temperature of subcooler, improve the non-freezability of reversing heat exchanger thereby. From the point of some kind of angle, the subcooler exchange in rectification tower matchs cold quantity to also have very big gain.