Large air separation FAQ

The pressure relief of molecular sieve in the purification system is generally rapid in the early stage, not complete and running overtime in the later stage. The pressure relief degree is adjusted by the manual stop valve in front of the pressure relief valve. Through practical adjustment, no matter how it is adjusted, the pressure relief in front is fast, or the pressure can not be exhausted. It is suggested that the valve positioner should be added to the automatic pressure relief valve, and the pressure linear adjustment should be programmed, so that the impact on molecular sieve will be much smaller.

Under the conditions of certain welding methods, welding materials, welding specification parameters and welding structure, the difficulty of obtaining high-quality welded joints is called steel weldability. Therefore, the weldability should be evaluated from two aspects of manufacturing and application. The weldability of process mainly refers to the possibility of various cracks in welded joints, which reflects the difficulty of manufacturing. Weldability of using mainly refers to the mechanical properties and special properties of heat resistance, corrosion resistance, low temperature resistance and fatigue resistance of welded joints, which reflects the reliability of use.

When the output pressure of turbine air compressor is constant, when the flow rate decreases to a certain value, surge will occur. Therefore, it is necessary to control the flow rate of the turbine air compressor and prevent its flow value from entering the surge zone. However, when the system resistance increases, the flow rate will surely decrease, which makes it possible for the flow value to enter the surge zone. Therefore, the common solution is to add a bypass valve from the outlet to the inlet or vent. When the turbine air compressor is normal, the valve is closed. The flow rate is reduced to a certain value, and then the flow through the turbine air compressor is increased.

When the same pressure is reduced, the temperature drop of throttling is far greater than that of expansion. This is because the gas does not work externally during throttling, but when the molecular spacing increases, the potential energy of molecules increases, and the kinetic energy decreases correspondingly, reflecting the decrease of temperature. The expansion refrigeration not only increases the potential energy between molecules, but also makes external work to push the impeller to rotate or push the piston to move. All these energies need to reduce the kinetic energy of molecules, so the molecular kinetic energy decreases more and the temperature drop is larger.

1.Before filling alumina and molecular sieve adsorbent into the adsorber, personnel should be arranged to enter the adsorber to check whether the screen screen is damaged. If there is any damage, it must be repaired before filling. 2.The quantity of adsorbent should be counted during loading and unloading, and the packing barrel and bag of adsorbent should be prevented from being damaged, and the adsorbent should be prevented from getting damp due to poor sealing. 3.The molecular sieve in the container should be filled in dry weather without rain. Personnel entering the container shall wear oil-free work clothes and caps and clean soft soled shoes.

The main causes are as follows: 1. The structure is unreasonable, the welding seam is concentrated and the welding joint stress is too large. 2. When welding, the molten pool is too large and overheated, and the alloy is burnt too much. 3. The arc crater is not filled due to too fast arc closing and too early wire drawing. 4. Material problems, for example, when Mg content is less than 3%, and impurities such as Fe and s exceed the standard, it is easy to cause cracks. When the melting temperature of welding wire is too high, liquefaction cracks in heat affected zone are easy to occur. Preventive measures include: 1. During the design, attention should be paid to the reasonable arrangement of welding seams, avoiding the stress concentration as far as possible, and selecting the welding sequence reasonably. 2. Reduce welding current or increase welding speed properly. 3. The arc stopping operation technology should be correct, and the arc pit should be filled by adding the ou

1. It is easy to produce air hole when the flux is wet 2. If the welding speed is too fast, it is easy to produce welding porosity 3. Welding gas hole caused by welding wire rust or oil stain 4. The welding seam has rust, oxide film, grease and other organic impurities, resulting in welding porosity 5. It is easy to produce air hole when welding with improper polarity 6. Welding porosity caused by flux contamination 7. Insufficient height of flux is easy to produce welding porosity 8. If the height of flux is too high, the gas is not easy to escape and the welding porosity is easy to be produced

With the continuous development of air separation plant manufacturing technology and the popularization and application of new equipment and process, the process of air separation plant has become increasingly mature and gradually reached the international level. The large-scale air separation plant is bound to bring a high increase in energy consumption. Energy saving and consumption reduction of air separation plant through advanced technology and equipment has become an important means for large-scale air separation users to reduce the operating costs of air separation plants and improve economic benefits.

1. When working at a height of more than 2 meters or multilevel cross operation, special personnel shall be assigned to guard or contact with each other, and it is strictly forbidden to command by more than one person. 2. The safety belt must be worn when working at a height of more than 2 meters, and it should be hung high and low. It is forbidden to hang the safety belt on the maintenance objects, on the pipelines and equipment (including electrical) of various dangerous media, and it is forbidden to drag the safety belt on the ground. It is strictly forbidden to use nylon material safety belt in high-temperature area or welding operation, and the flame-retardant and high-temperature resistant safety belt should be selected. 3. If there are high falling objects, the articles should be cleaned up in time, or the falling prevention measures should be added. 4. The safety rope should be lowered from the top of the silo as the hanging point of the safety belt for the high-altitu

1. According to the specific situation of the construction, formulate the fire protection scheme, establish and improve the fire safety system, and strictly abide by the operation rules. 2. Flammable and explosive materials such as paint and thinner shall not be stored in the project site. 3. The construction unit is not allowed to set up seasoning room in the project, and is not allowed to carry out paint allocation in the project. 4. No smoking is allowed in the construction site. A fire permit shall be issued and a special person shall be assigned to supervise the operation. 5. The operation site should be equipped with sufficient fire-fighting equipment. 6. During the construction period, the use of various open fire operations in the project shall be approved by the safety and environmental protection department of the construction unit, and sufficient fire-fighting materials and fire-fighting equipment shall be provided.

With the development trend of large-scale air separation plant, the column support of its matching cold box equipment tends to be large-scale. The traditional support structure has complex structure and poor bearing capacity. Through the use of finite element analysis software, DEAR air separation carries out finite element analysis and optimization on the commonly used experienced column of air separation plant, so as to improve the bearing capacity of support and reduce the processing difficulty, to reach the purpose of saving material cost.

Pressure swing adsorption and temperature swing adsorption of molecular sieve