Large air separation FAQ

1. Enter the work area, wear all kinds of labor protection equipment; check the surrounding working environment; confirm the tools and machines; prohibit the use of defective tools. 2.When using the sledge hammer, it is forbidden to wear gloves; it is strictly forbidden to stand in the range of before, after, up, down, left and right of the sledge hammer, and no one is allowed to stand on the opposite side to prevent injury. 3.Before welding operation, it is necessary to carefully check whether the electric welding tools used are insulated, whether the primary and secondary wires of the welding machine are damaged, and whether the grounding wire is in good condition; insulating gloves must be worn to prevent the occurrence of electric shock accidents when the welding machine stops power transmission and switches on. 4.The safety protection facilities of oxygen cylinder and acetylene cylinder should be complete and reliable. When working, the distance between oxygen cylinder an

When the new air separation plant is purged the first time, the air compressor pressure shall be increased to the quota pressure as far as possible. The purge valve should be fully opened as far as possible. Since the drain valve is connected together, the pressure is different. Therefore, when purging the drain valve, should purge one by one, and then close one after another for half an hour. After purging, do not fully close the purge and drain valves. Shut down the air compressor and wait until there is no pressure. Take all the valve bodies of the purge and discharge valves to check and clean, and then restore them. Only in this way can the purging be qualified.

Users reported that the on-line analyzer of a 30000 grade air separation plant showed that the outlet CO₂of the molecular sieve suddenly increased from the normal value of 0.43×10-6 to 120×10-6, and the temperature difference in the expansion air channel entering the two high-pressure plate fin heat exchangers began to expand. At the same time, the temperature in front of expander also decreased from - 105°C to - 132°C with liquid entrainment. After receiving the user's notice, DEAR air separation sent technical personnel to the site for observation and detection. It was found that the location of the self-cleaning filter of the equipment was close to the chemical boundary area. When the wind direction was in the downwind direction of the chemical industry boundary area, the phenomenon that the concentration of CO₂ in the air at the inlet of the self-cleaning filter of the air compressor exceeded the standard. In view of this phenomenon, the following opinions are given: 1. Sh

In the commissioning process of argon production system of new air separation plant, due to unstable gas demand and other reasons, the working condition of argon production system is easy to be fluctuated. The following is the analysis and treatment of common faults. 1. The nitrogen content in argon fraction increased Due to the small extraction amount of nitrogen products and crude nitrogen products, part of nitrogen enters into the argon production system along with argon fraction, resulting in the increase of nitrogen content in argon fraction. As a result, the temperature difference between oxygen enriched liquid air and crude argon in crude argon condenser is reduced, and normal heat exchange cannot be conducted. Finally, the crude argon cannot be condensed and the oxygen enriched liquid air cannot be evaporated. During the adjustment, the extraction amount of crude nitrogen and nitrogen is provided to reduce the outlet pressure of crude nitrogen to maintain normal operation c

The environmental conditions considered by the air separation plant include: altitude, atmospheric pressure, ambient temperature, air humidity, the content of impurities such as carbon monoxide in the air, etc. These conditions vary with different regions and environments. Different environmental conditions have different effects on the performance of the same air separation plant. 1. Influence of atmospheric pressure on air separation plant: Atmospheric pressure is the pressure exerted on objects in the atmosphere by the gravity of the atmosphere itself. In general, the atmospheric pressure is about 0.1MPa. When the atmospheric pressure decreases, the compression ratio of the air compressor will increase, which will increase the energy consumption of the air separation plant. 2. Influence of ambient temperature and humidity on air separation plant: The increase of ambient temperature will reduce the air compressor's exhaust volume, increase the exhaust temperature, increas

With the development of social economy, the air separation plant is in the trend of large-scale development. Air separation plant, as a large energy consumption user, is affected by domestic environmental protection and resource problems. It has great significance on the development of enterprises and the improvement of economic benefits to select a reasonable compressor driving mode.

Air separation plant is an important supporting facility for large-scale industrial enterprises, such as chemical industry, smelting industry, electronics industry and energy industry. Its operation condition is very important to the enterprise. In the actual production, the air separation plant is often be shut down by mistake due to many factors, such as instrument control incorrect interlocking, manual incorrect operation or network voltage fluctuation, which causes great losses to the enterprise. Here are a few preventive measures for incorrect shutdown.

When the air separation user's production line fails to achieve full load production and the oxygen demand is far lower than the production capacity of the air separation plant, if the oxygen compressor operates in constant pressure mode, it will cause frequent high-pressure discharge of the equipment, which will greatly cause energy waste and serious noise pollution.

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.