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Principle of liquefied air

Principle of liquefied air
The principle of liquefied air is to change the air from gas to liquid phase. The current method is to cool the air and let it condense. In the process of air liquefaction, in order to supplement the cold loss, maintain the working condition and make up for the deficiency of heat exchanger reheating, refrigeration cycle is needed.
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The most common failure of the liquid oxygen pump is the leakage of the seal. For the structure of mechanical seal, the key is the bad contact of the sealing surface of the dynamic and static ring of the friction pair. It is related to the grinding quality of sealing surface, the assembling quality of pump shaft and bellows, and the material of friction pair. For the labyrinth type seal structure, it is related to the adjustment of the seal clearance and the pressure of the seal gas. Other faults and solutions are as follows: 1) the pump can't start: the current is blocked. The circuit should be rechecked to switch on the current; the rotor gets stuck or the gap is too small. The pump should be removed for inspection and the clearance should be adjusted. 2) no drainage after starting: the steering of the pump is opposite. Check the motor steering, change the power wiring; the pump is not fully precooled, gas is generated. The pump should be stopped and fully precooled again; the inl...
Mar 27, 2024
The newly installed distillation column must be thoroughly heated and blown off before starting and returning to work after long-term parking. After being put into operation, when the liquid suspension failure of the distillation column can not be eliminated, or the pressure difference before and after the heat exchanger pressure at the end of the operation period is more than 0.5MPa, or the purity of oxygen and nitrogen and the output decrease, it should be heated and blown off. First of all, make preparations before heating: 1) discharge the liquid in the tower; 2) dismantle the flow meter and thermometer at the outlet of oxygen, nitrogen and distillation, dismantle the upper and lower joints of the liquid air and liquid oxygen level gauge, and dismantle all the pressure gauges except the low pressure gauge; 3) close the high pressure air General inlet valve, joint-1 valve, oxygen and nitrogen products outlet valve, and the heating inlet main valve; 4) open the top rod of the inle...
Jan 17, 2024
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