Production device and production process for producing ultra-pure oxygen and liquid nitrogen by adopting pre-cooling system

Abstract

The invention belongs to a production device and a production process for producing ultra-pure oxygen and liquid nitrogen by adopting a pre-cooling system. The production device comprises an ultra-pure oxygen production system and a liquid nitrogen preparation system, the ultra-pure oxygen production system comprises an oxygen raw material storage tank, and the oxygen raw material storage tank is connected with an ultra-pure oxygen storage tank through a raw material heat exchange unit and a thermal coupling rectifying tower; the liquid nitrogen preparation system and a cooling capacity supply system provide cooling capacity for the raw material heat exchange unit; and the liquid nitrogen preparation system provides cold energy for the thermal coupling rectifying tower and a top condenser at the top of the thermal coupling rectifying tower. The production device has the advantages that the structure is simple, the flow design is reasonable, the upper and lower towers and the circulating refrigeration process are adopted, the occupied area of the device is small, the investment is low, the product is stable, and the liquid nitrogen byproduct can be obtained while the ultra-pure oxygen product is obtained.

Description

technical field [0001] The invention belongs to the technical field of coupled production of ultra-pure liquid oxygen and liquefied nitrogen, and specifically relates to a production device and a production process for producing ultra-pure oxygen and liquid nitrogen by using a precooling system. Background technique [0002] Ultra-pure oxygen has great prospects for application in semiconductor components, integrated circuits, photovoltaic industry and other fields, but it is very difficult to prepare ultra-pure oxygen in industry; as we all know, air is an inexhaustible source of industrial oxygen production , Air separation oxygen production can adopt four methods, namely low temperature rectification method, normal temperature pressure swing adsorption method, membrane separation method and high temperature alkaline molten salt catalytic absorption method. Since air is mainly composed of nitrogen, oxygen, argon, carbon dioxide, methane, oxygen, etc., the composition of in...

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Problems solved by technology

Based on this, low-temperature rectification is mainly used in the industry to produce ultra-pure oxygen, but in the process of producing ultra-pure oxygen, oxygen needs to be liquefied and kept in a low-temperature state to achieve the purpose of rectification and purification, which consumes a large amount of cooling virtually. , which not only causes waste of cooling capacity, but also has defects such as oxygen venting

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