Liquefied air separation FAQ

Why is the pressure in the lower tower of the air separation equipment higher than that in the upper tower?

Only when the quantity and state of materials entering and exiting the distillation tower and each stock of materials completely accord with the material balance

How to choose the type of expander and expansion gas flow for cryogenic air separation equipment?

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...

What are the types of adsorbers used in the purification system of air separation equipment?

What is the structure of the molecular sieve adsorber in the air separation equipment?

As we know, in order to ensure self-cleaning of all low-voltage air separation plant, the temperature difference of cold end of switching heat exchanger must be controlled within the allowable range of temperature difference to ensure self-cleaning. The self-clearing temperature difference of the cold end is the temperature difference between the positive air passing through the section of the cold end and the return air passing through this section. In normal operation, the measured temperature difference at the cold end is self-cleaning temperature difference. However, in the start-up stage of the air separation unit, the temperature of the switching heat exchanger decreases continuously with time, and the self-clearing temperature difference of the temperature of the positive return flow through the channel is far greater than the measured temperature difference of the cold end. In addition, with the extension of switching time and the acceleration of temperature drop, the temper...

During the operation of small air separation equipment, the reasons why the liquid enters into the heat exchanger are: 1) during the start-up stage, the valve of the distillation column is closed and the pressure-reducing speed is too slow, and the liquid oxygen level is too full, which makes the liquid enter into the heat exchanger. The symbol at this time is that the pointer of the pressure gauge of the upper tower fluctuates, the oxygen flow meter beats badly, and the temperature of T3 drops, with which the high and middle pressure automatically drops. When encountering this situation, the valve can be shut down and the pressure-down speed can be increased appropriately, and the large section-1 valve can be opened to increase the air flow through the second heat exchanger. And part of liquid oxygen can be discharged properly. When closing the small air, liquid nitrogen throttle or lowering pressure, it is normal for medium pressure to slightly rise (about 0.05MPa rise every 1 hou...

What are the common methods for air separation equipment to remove some impurities from the air?

What are the hazards of cavitation in centrifugal liquid oxygen pumps of air separation equipment?

What is the cooling capacity of the expansion mechanism of air separation equipment

Air separation equipment to adjust the distillation conditions affect the oxygen production of the factors are