Liquefied air separation FAQ - DEAR Air Separation

Advantages of the liquid air separation plant

In the liquid air separation plant, the cooled refrigerant goes to the air machine through the refrigerant delivery pipeline, and the intercooler cools the compressed air to around 10°C, improving the efficiency of the air compressor and reducing the energy consumption of the air compressor. The air separation unit uses circulating nitrogen to recycle and utilise the CNG cold through a heat exchanger, which in turn liquefies the air to transfer the cold to the liquid air separation plant, an...

Mar 17, 2022

Non-electricity consuming solutions for LNG liquid air separation plants

The non-power consuming option for liquid air separation plants can be used for full liquid air separation plants，where the produced liquid is sold off. This approach is currently available for most LNG receiving stations. For air separation units with a large cold capacity, the liquid air can be pressurised to 6baA in a vacuum storage tank, and then heat exchanged through a heat exchanger, instead of the air compressor, directly into the cold box for distillation. At the same time in the cold b...

Mar 16, 2022

What are the characteristics and requirements of oxygen piping for liquid air separation plant?

The oxygen piping of liquid air separation plant has the following characteristics: One, high oxygen purity, the purity of oxygen produced by the liquid air separation plant ≥ 99.6%. Two, is the oxygen transport pipeline pressure, high pressure oxygen operating pressure at 8.77MPa. Third, is with the general characteristics of gas piping, the local airflow speed is fast, reaching 200 m / s. According to the characteristics of the oxygen pipeline requires that The appearance of the pipe...

Mar 15, 2022

How to arrange the piping in the liquid tank area of liquid air separation plant?

Liquid air separation plant liquid hub area piping arrangement is mainly oxygen, nitrogen, argon liquid pipeline and pump box in the liquid pipeline arrangement. As oxygen, nitrogen, argon liquid temperature is extremely low (liquid oxygen -183 ° C ℃, liquid nitrogen -196 ° C, argon liquid -185.7C), in the liquid flow process, resulting in a certain amount of gasification, piping should pay attention to the slope of the liquid pipeline towards (no slope requirements on the process). In ...

Mar 14, 2022

Liquid air separation plant piston compressor residual volume

Liquid air separation plant piston compressor clearance volume is: the compressor at the end of the exhaust, the piston and the cylinder end of the wall between the residual part of the high pressure gas occupied by the cylinder volume. The existence of the residual volume directly reduces the exhaust volume of the compressor, at the same time, the suction of this part of the high pressure gas expansion, will also cause a delay in the suction process, the reduction in suction volume, ultimately ...

Mar 09, 2022

Advanced features of liquid air separation plants

Liquid air separation plants save the investment and electricity consumption of seawater gasifiers, pumps or combustion vaporisers, and also allow access to liquefied air. The liquefied air is stored in a storage tank and then continuously transported into the liquid air separation plants via a liquid pump or vapour boosting to replenish the cooling capacity and ensure continuous operation of the air separation unit. The use of circulating nitrogen (or air) to absorb the cold at the low temperat...

Mar 08, 2022

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

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