DEAR Air separation equipment.The method is to observe the "sweating" or "frosting" parts on the wall of the cold box. At this time, attention should be paid to the leakage of low-temperature liquid, and the "frosting" part is below the leakage point.DEAR Air separation equipment.When the temperature of sewage nitrogen in the cold end is reduced, the temperature difference in the hot end will be enlarged, so that the insufficient reheating will increase the cold loss, the expansion will increase, and the product quantity will decrease; liquid hammer may occur, and the automatic valve will be easily damaged. In a word, air liquefaction at the cold end is harmful but not beneficial, and the expansion of temperature difference at the cold end is the most harmful.DEAR Air separation equipment.Generally, there is a dew point detector behind the heater, which should pay attention to the change of dew point; when using the electric heater, it should pay attention to that the flow of heating medium should not be less than the process flow requirements, otherwise it will be burnt out. Pay attention to check whether the power supply has been disconnected during cold blowing to prevent burning out the electric heating element.
DEAR Air separation equipment.In order to avoid the air at the cold end being liquefied, it is necessary to pay attention to the loop flow in the operation. The size of the circulating flow should be adjusted according to the temperature difference between the hot end, the cold end and the middle part of the accumulator. It can not be fixed mechanically because the air volume and the tower working condition are constantly changing. In addition, we should pay attention to the working condition of subcooler and liquefier, and deal with the problems in time. When the liquid is accumulated during the start-up process, if the expansion is too large, it should be reduced appropriately.DEAR Air separation equipment.If the automatic valve cannot be opened (or not fully opened), the resistance will increase and the material flow between the heat exchange units will be unbalanced. If the middle extraction valve fails to open, the air extraction will be interrupted and the self cleaning condition will be destroyed. If the automatic valve is not closed tightly, the air will run away from the heat exchanger, which will reduce the amount of air into the tower and the output of oxygen and nitrogen. At the same time, due to the increase of backflow, the cold loss of the hot end will increase, and in severe cases, the temperature of the hot end will decrease sharply. In addition, when the automatic valve falls, it is possible that the overpressure accident of the low pressure system will occur.
DEAR Air separation equipment.For the same substance, higher saturation pressure corresponds to higher saturation temperature. Increasing the pressure can increase the liquefaction temperature and make the gas easy to liquefy. That is, at a certain temperature, it can be liquefied by increasing the pressure. However, for every substance, when the temperature exceeds a certain value, no matter how high the pressure is, it is impossible to liquefy it. This temperature is called critical temperature.DEAR Air separation equipment.Whether the cold insulation material in the dead corner of the cold insulation box is full; whether the cold insulation material sinks after the equipment is running, causing the upper part to have a gap. The greater influence is whether the cold insulation materials keep dry. Because the thermal conductivity of dry pearlite is only 0.03-0.04w / (m ·℃), the thermal conductivity of water is 15-20 times of that of ice and 60 times of that of ice.DEAR Air separation equipment.When the argon content in the fraction is too low, the argon content in the fraction can be increased by turning down the liquid nitrogen regulating valve and improving the nitrogen discharge purity. During operation, special attention should be paid to the rise and fall of liquid oxygen surface. The adjustment of oxygen and nitrogen output and air volume should be carried out slowly, timely and properly, and strive for the stability of liquid oxygen level.
DEAR Air separation equipment.When the oxygen yield decreases, the oxygen purity will increase, and the argon rich region will move up, that is, the argon content in the argon rich region of the distillation section will increase, while the argon content in the argon rich region of the stripping section will decrease. This is because on the same tray, the total content of oxygen, argon and nitrogen in the gas phase should be 100%, and the total content of oxygen, argon and nitrogen in the liquid phase should also be 100%.Oxygen generator is also called air separation equipment (referred to as air separation equipment), it has many kinds, according to different classification methods, there are many different types. According to the product purity, it can be divided into high purity oxygen production units with oxygen purity above 99.2%, low purity oxygen production units with oxygen purity about 95% (also called process oxygen) and oxygen rich oxygen production units with oxygen purity less than 35% (also called liquefied air).
