In order to ensure the good operation of air separation unit, the common faults of air separation unit should be treated in time to avoid economic losses of enterprises.
DEAR air separation has cooperated with customers in metallurgical industry domestic and abroad in many projects, and has rich project experience. DEAR has continuously invested in the research and development of large-scale air separation plant. In view of metallurgical industry, DEAR combined with the characteristic of this industry, develops high-efficiency energy-saving air separation plant, to meet the needs of large and medium customers. DEAR air separation uses the rapid development of internet technology to establish a remote monitoring system to collect real-time operation data of each air separation plant, and provides the best suggestions for users by using big data analysis.
DEAR air separation has provided many sets of air separation plant for chemical industry for many years, with rich experience and the safe and stable unit operation. This unit adopts molecular sieve purification, booster turbine expander to supply the cooling capacity of the unit, and the whole rectification hydrogen-free argon production process. The rapid growth of enterprises in the industry is accompanied by the demand for production and the demand for air separation plant. DEAR air separation has cooperated with customers in the large-scale complete set of air separation plant KDON (AR) - 36000/70000-1200 project, which provides customers air separation plant with mature technology, reliable and convenient operation, and energy saving intelligence, which improves the production efficiency of customers, saving the operation cost and creates greater economic benefits.
The reflux liquid in the upper column of the distillation column is throttled by the lower column to the liquid air and liquid nitrogen of the upper column, and the reflux ratio of the upper column is regulated by the liquid nitrogen throttle valve. When the liquid air and liquid nitrogen pass through the throttle valve, the pressure will decrease, and the corresponding saturation temperature will also be reduced. If the supercooling degree of liquid is not enough, some liquid will be vaporized. The higher the gasification rate is, the lower the reflux ratio of the upper column is, and the purity of nitrogen is affected. Therefore, in order to improve the supercooling degree of the liquid nitrogen in the night sky through the throttle valve, a subcooler is generally set up to increase the supercooling degree of the liquid nitrogen in the liquid air.
1. The requirements of molecular sieve adsorber, electric heater and other equipment in place are the same as those of air cooling column of pre cooling system.
2. Process piping shall be constructed in strict accordance with relevant specifications and design and construction drawings.
3. The air tightness test shall be conducted before the valve is installed, and the test pressure and inspection standard shall be carried out according to the technical requirements of corresponding valves.
4. Pay attention to the direction of switch valve installation. V1201, V1202, V1207 and V1208 are front mounted valves, while V1203, V1204, V1205 and V1206 are reverse mounted valves. When the switch valve is installed, its shaft should be in a horizontal position, and the flange bolts should be evenly cross tightened.
5. The pipeline of pressure equalizing valve V1209 should have compensating bend.