DEAR Liquid air separation unit.As long as the content of water or carbon dioxide entering the expander is lower than the saturation content corresponding to the temperature after expansion, the water or carbon dioxide will not be separated out in the expander. Before the cold end of the switching heat exchanger reaches - 60 ℃, the water in the heat exchanger has not been completely separated out, and the water content into the expander is the saturation content corresponding to the temperature of the cold end.In the past, it was thought that the explosion of fractionator was caused by acetylene. The efficiency of acetylene adsorption could reach 98% when liquid air and liquid oxygen adsorbers were installed in the explosion-proof system. After years of practice and research abroad, it is found that in addition to acetylene, there are saturated and unsaturated hydrocarbons hydrocarbons, such as ethane, ethylene, propane and propylene, which are enriched in liquid oxygen.During the charging process, some molecules (including oxygen and nitrogen molecules) are adsorbed, and the corresponding adsorption heat is carried out by air when it is used. In addition, when the adsorber was first used, the adsorption capacity of molecular sieve was large, so the temperature increased significantly, which was not due to incomplete cold blowing.
The volume fraction of argon in air is 0.932%, and its boiling point is between oxygen and nitrogen. When it enters the lower column and rises block by block along the tray, because argon and oxygen are relatively nonvolatile components to nitrogen, they condense more into the liquid phase than nitrogen.In order to prevent the pipeline from freezing and cracking in winter, insulation measures must be taken for some outdoor detection pipelines with liquid medium. In places with low ambient temperature, steam or electric heating can be used for insulation. In general, the pipeline can be wrapped with asbestos rope and other insulation materials for thermal insulation;The economy of oxygen generator mainly refers to the cost of producing unit product (per 1m3 oxygen). The cost includes power consumption, water consumption, oil consumption, steam consumption, auxiliary material consumption, maintenance cost and production management cost. In order to improve the economy of oxygen generator operation, we should strive to produce more products and reduce production costs.
DEAR Liquid air separation unit.Since the subcooler and liquefier can fully recover the cooling capacity of the expansion air, it is unnecessary to send air to the upper tower too early. When the main cooling liquid area is enough, the normal distillation condition is established, it is appropriate to stop one expander and then send gas to the upper tower.DEAR Liquid air separation unit.Water is sprayed from the top of the tower to contact and mix with the air to cool the air. A plurality of cross flow sieve plates or fillers are arranged in the air cooling tower to increase the gas-liquid contact area. In order to separate the water, a water capture layer is set on the top of the tower. When the air flow rate in the air cooling tower is too fast, the water carrying or spraying amount is too much, and the water level automatic regulation fails, the water inflow accident of Molecular Sieve Purifier will occur.DEAR Liquid air separation unit.Compared with gas leakage, liquid leakage is more harmful, because its unit cooling capacity is twice as large as that of gas at the same temperature, and the density of liquid is hundreds of times of that of gas. Taking liquid oxygen as an example, if the leakage occurs at the speed of 1l / min, the increased cooling loss is 27200kj / h = 7.6kw, and the expansion of 600m3 / h is needed to make up for it. In fact, the equipment can not work normally. Therefore, the leakage of liquid pipeline is absolutely not allowed.
