The rising steam quantity of the tower and the condensation amount in the condenser evaporator of the air separation equipment factory are reduced, which also have certain influence on the distillation condition of the tower; After the switch over of the accumulator (or the switch over heat exchanger), the liquid air deposited in the backflow sewage nitrogen vaporizes due to the pressure reduction. When adjusting the temperature in the middle of the switching heat exchanger (or the accumulator), the influence of the change of the ring flow (or the medium pumping amount) on other temperature conditions should be noticed. Increasing the flow rate of the ring will lead to the decrease of the temperature difference at the cold end, the temperature in the middle and the temperature difference at the hot end. Therefore, there is a limit to increase the flow rate of the ring, that is to avoid the liquefaction of the air at the cold end and the increase of the cold loss at the hot end.
Distillation is to separate components by repeated evaporation and condensation processes. For example, oxygen and argon separation are carried out in crude argon tower. The separation of argon and nitrogen in the refined argon column. The separation of oxygen, krypton and xenon in krypton tower is the specific application of distillation. The temperature at the inlet and outlet of expander will be very low, the cooling capacity will be reduced and the operation is not safe. At the same time, the liquid level will be in the "hovering" situation. At this time, the expansion should be reduced and the role of supercooled and liquefacizer should be fully exerted. Some units will lead the air into the tower in advance after expansion, so that the temperature of the return gas at the cold end of the accumulator increases. Before the shutdown or opening of the supercooling condition is changed, the operating pressure of the entire oxygen network will be adjusted by an oxygen compressor to 1.8MPa (the minimum allowable operating pressure). Reduce the pressure difference between the front and rear of oxygen valve as far as possible, and reduce the discharge volume of the shut-down pipeline or spherical tank;
If the nitrogen content of the argon fraction is high, the temperature difference in the condenser of the crude argon tower will be reduced or even reduced to zero. In this way, the condensation of crude argon is reduced or non condensing, which makes the crude nitrogen tower unable to work normally. This will reduce the extraction of argon fraction and decrease the rising air velocity, resulting in the leakage of tower plate. In many processes of the air separation equipment manufacturers in nature, some processes can be carried out spontaneously in one direction, but not vice versa. Two gases with the same temperature and pressure are installed on both sides of a container. After the diaphragm is pulled out, the two gases will be mixed spontaneously and evenly. However, to separate them, work must be consumed. The cooling water of air separation equipment manufacturer is best softened. It is easy to soften by using magneto water device, and the effect is still acceptable. Settling tank shall be set up for removal of suspended matter. If the cooling water is recycled, it is beneficial to soften the water quality, but it covers a large area and has a large investment in infrastructure.
The heat transfer mechanism of porous tubes on the surface of air separation equipment manufacturers is that there are a large number of small holes which can generate bubbles in the thin layer of porous metal on the boiling side, namely the gasification core. That is, the liquid entering the hole can generate steam bubble only with little heat, which greatly reduces the superheat of liquid wall. Because the bypass air temperature is the saturation temperature under the air pressure of the tower, it is basically unchanged. Therefore, when the expansion volume increases, the temperature in front of the expander decreases and the superheat degree decreases after expansion. If the expansion is within the range of the distillation potential of the upper tower, it can still be sent to the upper tower, the extraction rate of oxygen will be reduced. On the contrary, the temperature before expander increases when the expansion volume is reduced.
