The main factors affecting oxygen production are:
1. Insufficient processing air volume. The reasons for insufficient air volume include: high ambient temperature; Atmospheric pressure is too low; The air intake filter is blocked; Low voltage or reduced grid frequency, resulting in a decrease in speed; The cooling effect of the intercooler is not good;
Internal leakage between stages; Leakage of valves and pipelines, leakage of automatic valves or switching valves; For the molecular sieve purification process, it may be due to the leakage of the switching butterfly valve.
2. The average purity of nitrogen is too low. The reasons are: the efficiency of the distillation tray is reduced; Excessive cold loss causes excessive expansion air volume; The purity of liquid nitrogen is too low, and the amount of liquid nitrogen is too large; The amount of liquid nitrogen is too small; Leakage of liquid air or liquid nitrogen subcooler; Excessive removal of contaminated nitrogen (or fractions); The opening of the liquid air and liquid nitrogen control valves is improper, and the working conditions of the lower tower are not adjusted properly.
3. Poor heat exchange of the main cooling system. Insufficient heat exchange surface of the main cooling system, or a large amount of non condensing gas on the nitrogen side, affects the heat transfer of the main cooling system and reduces the evaporation of liquid oxygen.
4. Equipment resistance increases. Due to blockage of the tray, liquid air adsorber, or subcooler, the opening of the liquid air and liquid nitrogen throttle valves is too small or blocked, which will cause an increase in the pressure of the lower tower and a decrease in the amount of air entering the tower. When the switching heat exchanger freezes, it will also cause an increase in system resistance and automatically reduce the amount of air entering the tower.
5. There is a leak in the oxygen pipeline and container.
DEAR Air Separation Industry Co., Ltd. launched the intelligent workshop renovation project for the Deer Air Separation Nonferrous Metal Air Fractionation Tower in April 2019. After six months of production process sorting and optimization design, the intelligent transformation plan was officially determined in November 2019. Through intelligent transformation, Deer Air Separation can achieve mixed production of three types of products: distillation tower pipes, tower bodies, and shaped parts, greatly increasing production capacity, saving labor and time costs. The original production line covering an area of 6000 square meters is optimized and assembled into an intelligent mixed production line covering only 3000 square meters. This transformation can be said to have pioneered intelligent manufacturing in the same industry in China.
