Liquefied air separation FAQ

Besides reducing air loss as much as possible, reducing equipment resistance to increase air volume and reducing loss of running cooling, incomplete loss of heat exchange and leakage as much as possible to reduce expansion air volume, here we analyze the methods of adjusting output mainly from the angle of adjusting rectification working condition: 1) the liquid level should be stable. The stability of liquid oxygen level marks the cooling balance of the equipment. If the liquid oxygen level is high and low, it is very difficult to adjust the purity. Reasonably adjust the expansion amount and the opening degree of liquid-air and liquid-oxygen regulating valve to make the liquid-oxygen surface stable. 2) adjust the purity of liquid air and liquid nitrogen. Rectification in the lower tower is the foundation of the upper tower. The change of the amount of liquid nitrogen and liquid nitrogen will affect the purity of liquid nitrogen and the reflux ratio of the distillation section of th...

What are the causes and phenomena of water ingress accidents in the molecular sieve purification system of air separation equipment? How to prevent it?

Currently, there are three types of high-pressure aerators applied in the air separation plant: 1) Water Bath type. Put the coil into water with steam flowing in. Use hot water to gasification liquid oxygen (or liquid nitrogen, liquid argon. Coil pipe adopts one or more tubes with larger diameter (for example, φ25mm×2 ~ 3mm) winding. Generally, it is made into one layer, and the upper and lower layers are equipped with confluence pipes or collectors (no single one ). Both the import and export pipes face up. The tube material should use aluminum tube or stainless steel tube. Keep the water temperature at 80 ~ 90℃. Its advantages are good heat transfer performance, small volume, light weight and safe operation. The disadvantage is that it needs to consume a certain amount of steam whose pressure is about 0.4MPa. 2) empty bath type. The heat exchanger is placed in the atmosphere, and the low temperature liquid is heated by air to make it gasification. The heat transfer pipe adopts sta...

Why should leak testing of air separation equipment be strictly controlled?

Air separation equipment molecular sieve purifier water inlet accident what phenomenon how to prevent?

What are the reasons and how to deal with excessive hydrocarbons in the main cooling system of air separation equipment?

What is the function and principle of self-cleaning air filter for air separation equipment?

How many adsorbers are there in the purification system of air separation equipment?

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...