Classification by refrigeration mode
1) distinction into high-pressure processes, middle-pressure processes and low-pressure processes. The working pressure of the high-pressure process is as high as 10. 0 ~ 20. 0 mpa, and the amount of refrigeration is entirely by the throttle effect, does not need an inflating machine, is simple and applies only to a small oxygen maker or propane nitrogen machine. The working pressure of the middle-pressure process is at 1. 0-5. Fracking-0 mpa, and for small empty unit swaths that do not require larger units of cooling to be balanced by large units of cooling, the working pressure is higher, and at this point the amount of refrigeration is mainly based on inflating machines, but also on a larger proportion of the voltage effect. (b) the working pressure of a low-pressure magisterial chief, who draws green to the process close to the pressure of the tower, is the most widely applied process with low unit energy consumption;
2) disaggregated into pistons, penetrating and pressurized substrates by the form of the extruder. Pistols are small and inefficient and are used only for some of the old small devices. The penring is based on a penring that is neither efficient nor applied in the widest sense. For low-pressure air partition units, as an inflated air enters the upper tower to participate in distillation, it is hoped that the expansion will be as small as possible to meet refrigeration requirements to improve distillation. Pressure-enhancing flattening is the use of the output power of the extruder to boost the compressor compression from air-pressure inflation, further boosting the pressure and then re-inflating the inflation to increase the unit cooling volume and reduce inflation. This is being used increasingly in new low-pressure spatial processes;
3) aerobic and nitrogen-inflated processes are classified as inflated gases. When the air enters the tower after expansion, it affects the distillation very much; nitrogen expansion reduces the condensation of nitrogen in the main cold, i. E. The flow fluids into the tower, and it also affects the distillation of the tower, each with its advantages and disadvantages。
Classification by purification
1) freezing of water and co2. During the cooling process, moisture and co2 are distilled and frozen within the heater channel; after a certain period of time, the route is to be switched, and the odour of a complex alliance that will freeze the re-flowing nitrogen gas is to be removed from the surface until it is modified. Depending on the type of the heater, it is divided into chillers and wing switching heaters. This mode of switch-over is frequent and the start-up operation is complicated and technically demanding for about one year;
2) molecular siftification process. The air has been emptied of impurities by the absorbent before entering the main heater. The sorbent's fight light runs through the ball for a long period of time, which makes it easier to operate a large symmetry, and the volume of pure nitrogen products, which is no longer subject to the re-flow requirements but to the requirements of the exhaust agent's gas hold, can operate for a period of up to two years or more, and is subject to increasingly extensive applications。
Classification by separation
The cryogenic separation of air is a distillation process in the distillation tower。
1) processes such as production of mono-high products, double-high products such as which hydrogen is weakly integrated, extracting americium products at the same time or extracting rare gases altogether;
Axis 2) is divided into sift towers and integrated filling towers according to distillation equipment。
3) classification by product compression
It can be divided into two categories: external compression of separation units and internal compression of devices. The external compression of the device is a stand-alone product with a very light gas, and has no direct impact on the operation of the device. The internal compression of the device is a pump-compressed liquid product which is then reheated, gasged and sent outside the device. It is relatively safe to compress, but the normality of the liquid pump will directly affect the operation of the device。
