Liquefied air separation FAQ - DEAR Air Separation

Isothermal throttling refrigeration in Liquid air separation plant

Conventional liquid air separation plants are cooled by isothermal throttling refrigeration and expander refrigeration, LNG cold energy air separation eliminates the need for an expander and utilises the cooling capacity of LNG and isothermal throttling refrigeration. The air separation unit uses circulating nitrogen gas to liquefy into liquid nitrogen in a liquefier, which is fed into the lower tower, where the cold is transferred to the distillation system to pump the dirty liquid nitrogen thr...

Mar 07, 2022

Fast Variable Load Technology of Liquid Air Separation Plant

A low pressure nitrogen expander is added to the process design. The pressure nitrogen from the pressure tower and high pressure expander is expanded into low pressure nitrogen, which is combined with the nitrogen coming from the low pressure tower and fed into the charge gas compressor. This is specially set up for rapid oxygen load changes. The oxygen product flow rate during normal operation corresponds to the amount of oxygen contained in the amount of air entering the air separation unit. T...

Mar 04, 2022

How to use the cold energy of liquid air separation plant?

The oxygen enriched liquid air passes through the oxygen enriched liquid air channel through the chiller and then throttles to the upper tower for further distillation, the nitrogen at the top of the lower tower of liquid air separation plant passes through the nitrogen channel to the condensing evaporator for condensation into liquid nitrogen. A portion of the liquid nitrogen is passed through the liquid nitrogen pipeline as reflux to the lower column, while the other portion is sub-cooled by t...

Mar 03, 2022

Brief introduction to the liquid air separation plant

In medium and large air separation plants, the purification system is an important part when separating oxygen, nitrogen and argon from air. The purification system commonly uses molecular sieve adsorbent to adsorb moisture, carbon dioxide, hydrocarbons, etc. in the air. The molecular sieve purification system plays an important role in the air separation equipment process to ensure safety. The molecular sieve purification system is generally composed of adsorber, electric heater, pipeline, val...

Mar 02, 2022

Cold energy usage process technology in liquid air separation plant

The raw air is compressed to about 0.52Mpa by the air compressor after filtering out dust and impurities, and then cooled to about 10℃ by the refrigerant glycol aqueous solution or Freon, and then enters the purification system to purify and remove water, carbon dioxide and other impurities in the air. Part of the raw material air enters the lower tower via the second raw material air pipeline, another part is liquefied into liquid air via the liquefier and enters the lower tower via the liquid ...

Mar 01, 2022

Liquid air separation plant traditional process

The nitrogen from the top of the upper tower is piped through the nitrogen gas pipeline, reheated through the main heat exchanger of the colder tower, and a portion of the nitrogen is pumped out, then combined with the first pipeline and a portion of the nitrogen vaporised in the liquefier in the third pipeline before going to the main vessel. The first raw material air pipeline is heated up and out of the cold box in liquid air separation plant, then goes to the high pressure heat exchanger of ...

Feb 28, 2022

Liquid air separation plant Integrated Utilisation Project

The liquid air separation plant uses circulating nitrogen to absorb the cold end of LNG, thus replacing the traditional hot and cold end expanders of the liquid air separation plant. The liquid air separation plant energy consumption is reduced by using glycol aqueous solution closed circuit to absorb the cold at the high temperature end of LNG, thus replacing the traditional cool water tower with lower cooling water temperature and less water consumption. The key of the liquid air separation pl...

Feb 25, 2022

The future of the liquid air separation plant cold energy industry

Traditional LNG receiving stations use seawater open-frame vaporisers or submerged combustion vaporisers to vaporise LNG, which not only wastes valuable cold energy but also produces localised low temperature pollution of the nearby sea. The air separation temperature range is between -190C - 150C and the LNG vaporisation temperature is -162C, which matches the liquid air separation plant temperature range. The use of LNG's high quality low temperature cold energy for liquid air separation plant...

Feb 24, 2022

New single column process of liquid air separation plant

There is an open heat pump argon extraction process. The new single column process can only use the open heat pump argon extraction process. Taking 10000cm³ air separation as an example, the main parameters are described as follows. 1、 The quantity of argon fraction is 4200-4300cm3 / h, the content of argon is 10%, the content of nitrogen is 1%, and the rest is oxygen. 2、 The theoretical plate number of the whole column is about 100. 3、 Two heat pump dist...

Feb 23, 2022

What are the causes of molecular sieve water ingress accidents of liquid air separation plant?

Causes of molecular sieve into the water accident: when the air-cooled tower level is higher than 3500mm water exceeds the height of the air inlet tube, a large amount of water with the air into the molecular sieve adsorber; when the air-cooled tower resistance rises, higher than 7kPa, the air-cooled tower will form a liquid suspension, resulting in bottom water level fluctuations, air-cooled tower resistance fluctuations, water with the air into the molecular sieve adsorber; molecular sieve swi...

Feb 18, 2022

Liquid air separation equipment gas liquefaction cycle

The liquefaction of gases can be divided into forward and reverse cycles. The forward cycle process is the absorption of heat from the higher temperature external heat source and the release of heat to the lower temperature external heat source. The reverse cycle is when the mass draws heat from a lower temperature external heat source and releases it to a higher temperature external heat source. The forward cycle converts heat energy into mechanical energy and the reverse cycle converts mechani...

Feb 17, 2022

Liquid air separation plant containers installation

on the tower on the section of the sealing plate and pure nitrogen export cap, coarse argon tower condenser coarse argon export cap must be removed on the ground, clear clean aluminum chips with clean white cloth or plastic wrap before lifting in place. During the lifting of aluminium pressure vessels and aluminium pipelines, the installation should take protective measures to prevent damage to the surface, such as rigging jacket rubber tube, rigging between with support to open. The...

Feb 15, 2022

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