DEAR Liquid air separation unit.The temperature difference of heat transfer rises, but it is impossible to return to the temperature difference of heat transfer before the change of working conditions, which is larger than the original, so the cooling capacity of backflow gas will still increase. However, due to the increase of air volume, the amount of cold absorbed per 1 kg air is reduced, otherwise it is impossible to reach a new heat balance. This will inevitably lead to the expansion of the temperature difference at the cold end and the decrease of the temperature difference at the hot end.The total pressure of the gas mixture is the result of the impact of various molecules on the wall. The pressure produced by each component is called component pressure, which can be regarded as the pressure PN produced when each component molecule exists alone in the container at this temperature. It is proved that the total pressure of the mixed gas is equal to the sum of the component pressures PN of each component.
DEAR Liquid air separation unit.The difference is that the refrigerator needs to rely on the phase change of low boiling point working fluid, while the air itself is compressed and expanded in the oxygen generator. The refrigerating capacity of a refrigerator refers to the heat Q2 (kw) taken away from the cryogenic material (chilled water) in unit time. It should be noted that chilled water is used indirectly to cool the air in the air separation unit, so the refrigerating capacity of the refrigerator is not equal to that of the air separation unit.Low pressure small diameter has threaded flange, high pressure and low pressure large diameter are welded flange, different pressure flange thickness and connecting bolt diameter and quantity are different. According to different levels of pressure, flange gasket also has different materials, from low pressure asbestos gasket, high pressure asbestos gasket to metal gasket.DEAR Liquid air separation unit.If it is serious, it must stop running and reheat. Once the chiller stops running, the argon production will stop immediately. In order to avoid the blockage of the air separation system, the air volume can be appropriately reduced during the failure of the refrigerator to reduce the load of the adsorber;
Each manufacturer shall conduct air resistance test on each unit (according to the pressure and flow specified in the design), and mark the resistance value of each channel on the outer surface of the unit for selection during assembly, so as to ensure that the resistance of each group is similar. Otherwise, it is difficult to control the temperature in operation.When the liquid air containing 1.3% ～ 1.6% argon flows down from the liquid air inlet, it will encounter rising vapor on the tray and some liquid will evaporate. Among them, the volatile component nitrogen evaporates more into the gas phase than oxygen and argon, so the concentration of oxygen and argon in the liquid phase gradually increases.Under the condition of saturation content, the vapor content does not increase, that is, the vapor content reaches the maximum. The partial pressure produced by vapor molecules at saturation content is called saturation partial pressure. With the increase of temperature, the energy of molecular motion increases, and more molecules can break away from the gravity of the liquid surface and enter the space and become vapor, which can aggravate the evaporation process.
