For metallurgical industry, if the pressure of oxygen product is less than 3.0MPa (g) and the scale is 8000nm ³/ For the air separation equipment below h, the external compression (piston oxygen compressor for oxygen compressor) process is generally selected. This process has the advantages of simple process, flexible operation, low investment and small land occupation. However, the internal compression flow process can not be used for the air booster due to its small volume.
For the metallurgical industry, the pressure of oxygen products is generally less than 3.0MPa (g), and the scale is 8000nm ³/ h～80000Nm ³/ For H-scale air separation equipment, when the user's liquid product sales market is poor, the external compression (oxygen compressor adopts oxygen turbine compressor) process is generally selected. This process has the advantages of simple process, flexible operation and low investment; When the user has high requirements for argon products, the user has a good local liquid product sales market, or has high safety requirements and high floor area requirements, the oxygen internal compression process shall be selected.
The oxygen pressure is 0.2 ~ 1.2MPa (g), and the output is 8000nm ³/ For users above h, the oxygen internal compression process should be selected from the aspects of saving investment and simple operation.
At present, the process organization type of DEAR air separation plant has been diversified. Whether external compression, internal compression or self pressurization air separation process has been very mature. At the same time, all units of air separation plant with oxygen and nitrogen product specifications required by iron and steel enterprises can be realized, and a lot of experience has been accumulated in safety, reliability and stability, According to the needs of users, reasonably select the process, and optimize the comprehensive investment of primary investment and operation consumption.
