Oxygen-rich liquid air

The air separation distillation column is composed of upper and lower columns, crude argon column and pure argon column and so on. At present, there are two kinds of lower column of large air separation plant, which are sieve plate column and packing column, while the upper column and argon column have generally used regular packing column with less resistance. During the normal operation of air separation plant, a certain amount of low-temperature liquid, i.e. the liquid holdup of distillation column, will be retained on the surface of internal parts such as sieve plate, overflow bucket or filler in the column. Generally, when the load of air separation plant is high, the liquid holdup in the column will be larger, and when the load of air separation plant is low, the liquid holdup will be smaller, respectively. When the air separation plant is under variable load operation, the change of liquid holdup in the column will affect the working condition of the distillation column and affe

The newly installed distillation column must be thoroughly heated and blown off before starting and returning to work after long-term parking. After being put into operation, when the liquid suspension failure of the distillation column can not be eliminated, or the pressure difference before and after the heat exchanger pressure at the end of the operation period is more than 0.5MPa, or the purity of oxygen and nitrogen and the output decrease, it should be heated and blown off. First of all, make preparations before heating: 1) discharge the liquid in the tower; 2) dismantle the flow meter and thermometer at the outlet of oxygen, nitrogen and distillation, dismantle the upper and lower joints of the liquid air and liquid oxygen level gauge, and dismantle all the pressure gauges except the low pressure gauge; 3) close the high pressure air General inlet valve, joint-1 valve, oxygen and nitrogen products outlet valve, and the heating inlet main valve; 4) open the top rod of the inle...