Large air separation FAQ

After a long-term operation of the air separation plant, the components in the low-temperature equipment and pipelines of the distillation system will be blocked due to the internal precipitation of icing or mechanical powder, which will increase the resistance of the fractionating column. Therefore, after the normal operation of the air separation plant for about 2 years, the fractionating column system should be heated and thawed to remove these sediments. When the molecular sieve adsorber and the main heat exchanger have water or other faults, they must also be stopped for heating. The following describes several heating and thawing operation methods:

The air separation distillation column is composed of upper and lower columns, crude argon column and pure argon column and so on. At present, there are two kinds of lower column of large air separation plant, which are sieve plate column and packing column, while the upper column and argon column have generally used regular packing column with less resistance. During the normal operation of air separation plant, a certain amount of low-temperature liquid, i.e. the liquid holdup of distillation column, will be retained on the surface of internal parts such as sieve plate, overflow bucket or filler in the column. Generally, when the load of air separation plant is high, the liquid holdup in the column will be larger, and when the load of air separation plant is low, the liquid holdup will be smaller, respectively. When the air separation plant is under variable load operation, the change of liquid holdup in the column will affect the working condition of the distillation column and affe

With the development of social economy, the air separation plant becomes larger. The scale of air compressor, supercharger and other units of large air separation plant is increasing. Taking the air compressor as an example, power of the main motor has reached more than 30000 kw. For the different power grid conditions, motor configuration and motor starting mode of different users, the related electronic control design technology of air separation plant has been improved correspondingly. Here is a brief introduction to the starting mode of air compressor motor.

Argon is a rare gas widely used in various fields of industry. It is used as protective gas for arc welding of stainless steel, aluminum and other metals, as well as gas for blowing and smelting steel, aluminum, titanium, zirconium and other metals. Argon is used for lighting technology and filling of fluorescent lamps. Industrial electronic products also use argon as protective gas. The content of argon in the air is 0.932%. In the air separation unit, 30% - 50% of argon in the processing air can be obtained as a product. With the improvement of argon production technology and the improvement of advanced air separation process and operation method, the extraction rate of argon has been increased to more than 80%.

With the continuous development of social economy and science and technology, the production scale of air separation equipment is getting larger. As an important part of the whole air separation equipment, automatic control system develops from the original instrument control system to PLC automatic control system, then develops to the DCS, CCS, SLS and AMS control systems which widely used nowadays. With the improvement of social awareness of energy and environmental protection, the advanced control system is used to realize the optimization of air separation equipment, and the control technology of automatic load changing to realize energy saving and consumption reduction is also emerged.

More than half of all air separation equipment accidents were the explosion caused by the main cooling system. When processing air, all the impurities which have not been completely removed will finally gather in the main cooling liquid oxygen.

In the air separation plant, the main heat exchanger is the key equipment to ensure the performance of the whole set of equipment. The function of the main heat exchanger in the molecular sieve pre purification process air separation equipment is to ensure the temperature difference at the hot end to be kept at the design value by recovering the cold quantity of the backflow gas, provide sufficient expander gas to expander, make up for the cold quantity loss of the equipment, and provide the raw gas under the design condition for the lower tower.

1. Workers must wear safety helmets properly when entering the construction site, because the construction site is often chaotic. Some equipment installation sites, several construction teams are working at the same time, it is impossible to completely guarantee that there are no falling objects.2. Proper use of personal protective equipment, and carefully implement safety protection measures. When working on high places, cliffs and steep slopes without protective facilities, safety belts must b...