Air separation parts FAQ

What are the reasons why the main cooling liquid level of the air separation equipment is not high and how to solve it?

Leakage is the easiest failure of regulating valve during operation. Some leak at the welding place, and some leak at the sealing place of the stuffing. When leakage occurs at the welding site, repair welding can be done during overhaul; when leakage occurs at the sealing site of the stuffing, new stuffing can be replaced. Sometimes the film of the film actuator is damaged, and the valve stem can't act normally with the air pressure signal, so it needs to be replaced with a new film. In order to avoid the deformation of the valve stem affecting the regulating function, it is better to stand on the pipeline when installing the regulating valve. It is not suitable to install the low-temperature film regulating valve horizontally, and it should form an angle above 150 with the level so that the sealing place of the stuffing is not affected by the liquid. The slanting valve must be lifted. When operating, always pay attention to whether the regulating valve gets stuck. The sealing fille...

What are the safety precautions for air purification systems in air separation plants?

The most likely leakage of switching heat exchanger is the welding line, especially the joint of the head and the pipeline. Most of the causes of leakage are the quality problems of manufacture and installation, which are also related to maintenance. The working condition of switching heat exchanger is poor. It is not only impacted by alternating airflow, but also changes greatly in airflow temperature. In long-term operation, the weak parts are easy to leak. Therefore, the welding quality should be strictly guaranteed during manufacture and installation. After installation, strict leak detection and pressure test must be carried out before driving, and problems should be dealt with timely to avoid passivity after driving. There are three methods to check whether the switching heat exchanger leaks in operation: 1) flow method. When a large amount of leakage occurs between the channel of product oxygen or product nitrogen and air channel, the output of oxygen or nitrogen increases ob...

For the pipeline with pressure, the easiest problem in the production process is the leakage at the connection flange. Once leakage is found, do not tighten the bolt under pressure. There are some reasons for the leakage in the process of operation, such as gasket damage, pipeline under thermal stress, etc. At this time, the problem can't be solved only by twisting the bolt, and often screw the Bolt hard because the leakage has not been eliminated until the bolt is broken and the high pressure gas in the pipe sprays out, causing injury accidents. There have been several factories which have suffered from the accident of Bolt fracture caused by the screw bolt with pressure and the casualty of flange plate flying out. Therefore, it is necessary to strictly abide by the regulation that the screw bolts with pressure are not allowed, and it is not allowed to hold fluke mentality and violate the operation regulations in order to seize time and catch up with tasks.

What is the reason for the temperature drop in the expansion of an air separation plant expander being greater than the throttling temperature drop effect?

What are the impurities in the air and why do they need to be removed during the process of air entering the air separation equipment?

What are the reasons why the rated power and pressure of the low-temperature liquid pump in the air separation equipment cannot be reached, and how to deal with them?

What are the advantages and disadvantages of nitrogen production by cryogenic air separation equipment and nitrogen production by pressure swing adsorption?

What are the roles and principles of pre-cooling systems for air separation equipment?

How to determine if there is a leakage inside the air separation equipment?

The air contains a small amount of water vapor, carbon dioxide, acetylene, hydrocarbon and a little dust and other impurities. It will be very dangerous to let these impurities enter the air separation plant. Solid impurities will wear the device, especially threatening the safe operation of high-speed rotating equipment. Bringing them into the heat exchanger will also pollute the surface of heat transfer, reduce the heat transfer effect; steam and CO2 will freeze and precipitate in succession under the condition of low temperature, thus blocking the gas Channel and the sieve hole of the tower plate; the accumulation of acetylene and hydrocarbon tables in the distillation column is excessive, it is easy to trigger explosion. Therefore, in order to improve the safety, reliability and economy of the unit operation, the air must be purified.