Air compression

Reducing the high pressure of small air separation equipment with medium pressure expansion machine can reduce the energy consumption of air separation equipment. Here is a simple analysis of the influence of the temperature before the expansion machine on the high pressure. Under the condition that the total cooling loss and the gas temperature before expansion are fixed, from the perspective of the heat balance of the total unit, increasing the high pressure can reduce the expansion gas; but from the perspective of ensuring the working condition of the cold section heat exchanger, with the increase of high pressure, it is required to increase the expansion amount and reduce the air flow into the cold section heat exchanger. Therefore, the selection of working pressure and expansion amount of the process should meet both requirements. When the total cooling loss and working pressure of the process remain the same, increasing the temperature of expansion forward gas can increase the...

As the air of the air separation plant of the molecular sieve purification process removes impurities such as moisture and carbon dioxide through the adsorption of the molecular sieve, compared with switching the purification process, the start-up operation is simple and easy to control. It doesn't need to consider the complex influences such as self-cleaning of water and carbon dioxide, precipitation of water and carbon dioxide in the expansion machine, and the attention of starting process mainly focuses on giving full play to the refrigeration capacity of the expansion machine, reasonably allocate cooling capacity and fully cool the equipment. It can be divided into three stages: cooling equipment, accumulation of liquid and adjustment of rectification working condition. Compared with the start-up mode of switching process, it can be called "comprehensive cooling method" or "one-time cooling method ". The following points should be paid attention to when starting the operation: 1...