Medical Oxygen Cryogenic ASU Liquid Oxygen

Cryogenic air separation plants processes rely on differences in boiling points to separate and purify products. The basic process was commercialized early in the 20th century. Since then, numerous process configuration variations have emerged, driven by the desire to produce particular gas products and product mixes as efficiently as possible at various required levels of purity and pressure. These air separation process cycles have evolved in parallel with advances in compression machinery, heat exchangers, distillation technology and gas expander technology.

All cryogenic processes include these steps:

• Filtering and compressing air
• Removing contaminants, including water vapor and carbon dioxide (which would freeze in the process)
• Cooling the air to very low temperature through heat exchange and refrigeration processes
• Distilling the partially-condensed air (at about -300˚F / -185˚C) to produce desired products
• Warming gaseous products and waste streams in heat exchangers that also cool the incoming air stream

Cryogenic processes are the most cost effective separation process for producing at high production rates and are capable of making the highest purity products.

The portions of the cryogenic air separation process that operate at very low temperatures (the distillation columns, heat exchangers and cold interconnecting piping sections) must be well insulated to minimize energy consumption and avoid operating problems. To accomplish this, these components are located inside insulated, sealed (and nitrogen purged) structures called "cold boxes”. Cold boxes may have a rectangular or round footprint and, depending on plant type and capacity, may measure approximately 2 to 4 meters on each side and have a height of 15 to 60 meters. Cold box as follow,

The basic principle of air separation plants is use cryogenic rectification to condense air into liquid and separate the air according to the evaporation temperature of each component. The two-stage rectification tower simultaneously obtains pure nitrogen and pure oxygen at the top and bottom of the upper tower. It is also possible to take out liquid oxygen and liquid nitrogen from the evaporation side and the condensation side of the main cooling respectively. The air separation in the rectification tower is divided into two stages, air is separated for the first time in the lower tower to obtain liquid nitrogen and at the same time obtain oxygen- enriched liquid air. The oxygen- enriched liquid air is sent to the upper tower for rectification to obtain pure oxygen and pure nitrogen. The upper tower is divided into two sections: with the liquid- air inlet as the boundary. the upper part is the rectification section, which rectifies the rising gas, recovers the oxygen component, and purifies the nitrogen purity, and the lower section is the stripping section to remove nitrogen components in the liquid, separated to improve the oxygen purity of the liquid.

     

Cryogenic air separation plants is widely used, and different application scenarios have specific requirements for flow, purity, pressure, dew point and other parameters.  In order to make your shopping experience happy, please leave your demand information, we will let professional engineers contact you, design specific technical solutions.  

Technical information	Your kind requirement
Capacity	________Nm³/h
Purity	_________%
Outlet pressure	_________Mpa or Bar
Power	________V/HZ