تولیدکننده اکسیژن و نیتروژن مایع

Investigation and comparison of oxygen production

Oxygen is required in gas supply processes to an oxidant. Air or steam may be sufficient as a gas supply agent depending on the work process. Oxygen blower systems have the advantage of minimizing the size of the gasification reactor and its auxiliary process systems. However, oxygen must be removed from the atmosphere. Large-scale air separation plants are built on refrigeration distillation technology that can supply and produce high-purity, high-pressure oxygen. This technology is well understood, because it is more than 75 years old. Refrigeration air separation is known for its reliability and can be designed for high capacity (maximum 5000 tons per day). The study and comparison of oxygen production is described in two main ways:

1- Production of oxygen by PSA (Pressure Swing Adsorption)
2- Production of oxygen by partial distillation by ASU (Air Separation Unit)

1- Oxygen production in PSA devices is based on the passage of compressed air through zeolite granules, which is called molecular sieve.

In this method, non-consumable gases such as nitrogen, which make up 78% and the rest of them, which make up 1% of the air volume and are considered as a kind of pollution, are trapped in their microtubes while passing through zeolite tablets. In fact, the molecules of these gases with their own structure and size, which are from highest to lowest, respectively: water vapor, carbon dioxide, hydrocarbons and nitrogen, are embedded under pressure into zeolite microtropes, but oxygen molecules that are smaller without They are absorbed, pass through the labyrinth of zeolite tablets and are used as a production gas.

The purity of oxygen produced by this method is about 90 to 95%, which is suitable for medical use or fish farming, but does not have the necessary purity for industrial use such as cutting.

The following figure shows the process of oxygen production by PSA method.

PSA-oxygen

2- Production of oxygen by partial distillation by ASU (Air Separation Unit)

In this method, air is converted to liquid in five steps as follows, and then its constituent elements are separated:
(1) – Air Compression
(2) Purification and Drying
(3) – Expansion and Liquifaction
(4) – Refrigeration Refrigeration
(5) – Distillation Distillation

The air is compressed by multi-stage compressors up to about 200 bar. (The amount of pressure in the compressors can vary.) In the process, most of the impurities, including water vapor, carbon dioxide, and associated hydrocarbons, are captured and discharged by the condensate traps. The air is then filtered to remove impurities such as water vapor and carbon dioxide from the zeolite, separated, and then the air purified by the freon system is cooled to about -30 ° C and then passed through the expander turbine and valves. The expansion drops sharply from 200 to 5 bar and cools rapidly to a temperature of about -170 ° C. With this temperature, which is in the form of two phases of liquid and gas, the air enters the fifth stage and the distillation column, and here, which is the heart of the device, the distillation and separation of air into parts is performed. In fact, distillation is a process of evaporation and re-contraction that is used to separate a mixture of liquids from each other according to their boiling point. It should be noted that the boiling point of oxygen at atmospheric pressure is -183 degrees Celsius, argon is-185 and nitrogen is -196 degrees Celsius. That is, each of the mentioned elements at these temperatures is converted from a gas state to a liquid. Oxygen or nitrogen, in the form of gas or liquid, which is produced according to this method, is the best and safest product in terms of quantity and quality.

Prهestley Gas Industries, using experienced and trained operators and simultaneously using digital laboratory equipment and set-board testing, produces oxygen with a purity of 99.9% and nitrogen with less than 5ppm and using its equipped fleet to produce cryogenic products with Petibandi distributes to its esteemed customers in all parts of the country with its slogan of “timely supply”. Oxygen is shown by the ASU method.

Priestley Gas Industries, using experienced and trained operators and simultaneously using digital laboratory equipment and set-board testing, produces oxygen with a purity of 99.9% and nitrogen with less than 5ppm and using its equipped fleet to produce cryogenic products with Petibandi distributes to its esteemed customers in all parts of the country with its slogan of “timely supply”. Oxygen is shown by the ASU method

ASU oxygen production

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