Liquid air separation device and method for extracting medium pressure oxygen

Abstract

The invention discloses a liquid air separation device and method for extracting medium pressure oxygen. An air compression system and a pre-cooling system are connected with a purification system, the purification system is connected out and forms a direct current channel, a pressurization channel and an instrument air supply channel, the pressurization channel is sequentially connected with a pressurization system and a heat exchange system, the direct current channel is directly connected with the heat exchange system, the heat exchange system is connected with a distillation system througha plurality of pipelines, the liquid air separation device further comprises an automatic control system, and the pre-cooling system, the purification system, the heat exchange system and the distillation system are all connected with the automatic control system. The oxygen in air is purified through a cryogenic distillation method, oxygen interior compression is adopt, a large number of liquidproducts are generated, both medium pressure oxygen products and the large number of liquid products are produced, only a low temperature expander is used for providing the cooling capacity required for air separation, the output of the products is ensured, through reasonable matching between the pressure of a pressurization machine and the flow of the expander in the process, a plate heat exchanger can recover the cooling capacity better, energy consumption is reduced, the pressurized end of the expander is used for continuing to pressurize high pressure air, the end discharge pressure of thepressurization machine is lowered, and then the difficulty of making the pressurization machine is lowered.

Description

Technical field [0001] The invention relates to a device and a method for extracting medium-pressure oxygen liquid air separation, and belongs to the field of air rectification. Background technique [0002] Air separation equipment is an indispensable supporting equipment in steel metallurgy, coal chemical industry, ammonia synthesis and other industries. Air separation not only mainly provides the pressure oxygen required by enterprises, but also provides some liquid products. Pressurized oxygen meets the normal output of downstream products of the enterprise. On the one hand, liquid products are used to consider the emergency of the backup system, and on the other hand, they can be sold as products to bring economic benefits. With the development of the gas industry in recent years, the benefits of liquid products have also appeared considerable. Increasing the output of liquid products presents advantages in improving economic efficiency and reducing overall operating costs...

AI Technical Summary

Problems solved by technology

However, the current liquid air separation for extracting medium-pressure oxygen has the following disadvantages: 1. High energy consumption, high cost, and low utilization rate; 2. Multiple expanders are required; 3. The process is complicated and difficult to operate

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