What should be paid attention to in the 4th season of the air separation oxygen plant

The influence of the four seasons on the air separation is mainly the ambient temperature and the circulating water temperature, and these two points have the greatest impact on the air separation in summer and winter, and there are some other influences in different regions. The main points to note are as follows:

In spring, there will be catkins and fallen leaves in some places, which can easily float into the circulating water cooling tower, and eventually clog the inlet filter of the circulating water pump and cause the car to jump.

In summer, the main reason is that the ambient temperature is high and the circulating water temperature is high, so it is necessary to pay attention to the temperature difference of the heat exchanger of each equipment, oil temperature, etc., and it is easy to jump out of the car with high temperature. The failure rate of the corresponding rotating equipment is also the highest in the year, and it is necessary to be diligent in monitoring and inspection. In some places, thunder and lightning are frequent in summer, so you should pay attention to lightning protection and jump cars.

In autumn, the air is dry, oxygen production is the key area of fire and explosion prevention, special attention should be paid to the surrounding fallen leaves, to clean up in time, oxygen emissions should be monitored to avoid fire.

In winter, the environment and water temperature are the lowest, which is the season with the best air separation operation efficiency, but it is necessary to pay attention to the equipment anti-freezing, and the heating facilities should be diligent in monitoring and inspection. In particular, the anti-freeze of some measuring instruments is prone to shutdown if the business trip fails. The packing on the circulating water cooling tower is susceptible to ice damage.

All in all, it is necessary to supervise a good monitoring and equipment maintenance system, and observe and think more carefully to ensure the smooth operation of the equipment.

Air compressor current Because the air temperature is lower, the gas will expand internally, so the air compressor work efficiency will increase There are also some molecular sieve drainage valves Pay attention not to freeze, and the equipment with an independent water system should pay attention to the drainage of the shutdown equipment to prevent freezing and cracking.

Summary. Air separation oxygenation production refers to the amount of oxygen produced during the separation and purification of oxygen by air separation equipment. An air separation plant is a type of equipment that works by separating air into nitrogen, oxygen, and other gases.

The main principle is to compress and cool the air, liquefy it, and then separate the liquid air into oxygen, nitrogen, and other gases through a separation column.

Air separation oxygenation production refers to the amount of oxygen produced during the separation and purification of oxygen by air separation equipment. An air separation plant is a type of equipment that works by separating air into nitrogen, oxygen, and other gases. The principle is to compress and cool the air, liquefy it, and then separate the liquid air into oxygen, nitrogen, and other gases through a separation column.

Excuse me, but please go into more detail?

In this process, the amount of oxygen produced depends on the design and operating parameters of the ASU, including pressure, temperature, flow rate, material and size of the separation column, etc. Therefore, the ASC production can be controlled and improved by adjusting these parameters.

The factors that affect oxygen production, in addition to reducing air loss as much as possible, reduce the resistance of air separation equipment to increase air volume; In addition to reducing the amount of expanding air as much as possible to reduce the amount of cooling loss, incomplete heat exchange loss and leakage, here is mainly from the perspective of adjusting the distillation condition, the method of adjusting the output is analyzed: 1) The liquid level should be stable. The liquid oxygen level is stable and indicates the cooling balance of the equipment.

If the liquid oxygen level fluctuates, it is difficult to adjust the purity. Reasonably adjust the expansion amount and the opening of the liquid air and liquid oxygen control valves to make the liquid branch oxygen surface stable. 2) Adjust the purity of liquid air and liquid nitrogen.

Down-column distillation is the basis of the upper-column distillation. The change of the amount of air and liquid nitrogen taken out will affect the pure skin sensitivity of air and liquid nitrogen, and affect the reflux ratio of the upper column distillation section. If the amount of liquid nitrogen taken out is too small, although the nitrogen purity is high, the nitrogen purity will be reduced if too little reflux liquid is supplied to the distillation section.

In this case, due to the low oxygen concentration in the liquid space, the oxygen purity will decrease and the oxygen production will decrease. Therefore, the best distillation condition for the lower column should be to maximize the amount of liquid nitrogen extracted when the purity of the liquid nitrogen meets the requirements. On the one hand, it provides more reflux liquid for the upper column rectification section; On the other hand, the oxygen concentration of Air Liquide is increased, and the rectification burden of the upper column is reduced, so that it is possible to increase the oxygen production.

It should be noted here that the liquid nitrogen purity should be adjusted by the liquid nitrogen control valve, and the liquid nitrogen return valve of the lower tower cannot be used. The return valve should be fully open under normal conditions. 3) Adjust the distillation conditions of the upper column and strive to improve the average nitrogen purity.

The average nitrogen purity is an indication of the rate of oxygen loss. The average nitrogen purity depends on the purity of the polluted nitrogen, because the amount of polluted nitrogen accounts for a large proportion. The purity of the dirty nitrogen is also mainly ensured by the liquid nitrogen provided by the lower tower.

When the distillation condition of the lower column is normal, but the purity of the dirty nitrogen is still too low, it may be that the distillation efficiency of the upper column is reduced (such as blockage or leakage of the tray); or the amount of expanded air is too large; Or the oxygen extraction amount is too small and the purity is too high, so that the rising vapor volume increases and the reflux ratio decreases. To improve the distillation condition of the upper tower, the main thing is to control the amount of oxygen and nitrogen extracted. On the one hand, the amount of withdrawal of the two should be appropriate; On the other hand, the valve opening should be moderate, so as to reduce the pressure of the upper column as much as possible, which is conducive to distillation to improve the purity of dirty nitrogen.