Liquefied air separation FAQ - DEAR Air Separation

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

Site construction requirements for chillersn in liquid air separation plant

The site should be carefully checked for the chiller type and evaporator design pressure. It is not possible to use the water inlet as a water outlet and vice versa: the water flow switch is determined to be installed. The first start-up must be carried out under the guidance of the chiller plant manufacturer's personnel. Do not power on the chiller without permission. The installation requirements of the chiller plant are reflected in the operating instructions and the chiller plant manufactur...

Feb 14, 2022

LNG Cold Energy Utilisation Air Separation Unit

LNG Cold Energy Utilisation Air Separation Plant is a liquid air separation plant for the utilization of LNG cold energy with a high utilization rate of cold energy, energy saving and environmental protection, high efficiency and safety factor. Liquid air separation plant for LNG cold energy, including air compression pre-cooling system, purification system, air separation system, nitrogen circulation system. The nitrogen circulation system consists of a high pressure heat exchanger to recover ...

Feb 11, 2022

Composition of the liquid air separation plant

The liquid air separation plant includes the lower tower, upper tower, condensing evaporator, argon system, main heat exchanger, subcooler, liquefier and is placed in a separate cold box. After distillation in the lower tower, high purity nitrogen is obtained at the top of the lower tower, which is reheated by the main heat exchanger and then exits the cold box and goes to the nitrogen circulation system to recover the cold from the liquid air separation plant to make liquid nitrogen. The lower ...

Feb 10, 2022

Installation of piping outside the cold box of liquid air separation plant

(1) Can be based on the cold box outside the piping diagram provided by the equipment manufacturer and the relevant national standards and norms for industrial piping installation. For heavier weight valves, small lifting tools can be used to temporarily support them. When the piping is good, use fixed brackets to support. (2) Liquid discharge mains should be installed with compensation parts. (3) The aluminium pipe leading out of the cold box with its welded pressure plate and its seal ring s...

Feb 09, 2022

Purging of liquid air separation plant

The purpose of the blowing is to clean out the residual slag, aluminium chips and other debris from the piping and vessels. the air source for blowing is provided by the turbine compressor, and the air cooling tower must be activated. 3. blowing principle, first outside the tower, after the tower, blowing brush to be one after another, in the blowing with the air pressure: low pressure system. Should be maintained at 40 a 50kpa high pressure system: should be maintained at 250 ~ 400k...

Jan 27, 2022

Installation of pipes in the cold box in liquid air separation plant

Installation of pipes in the cold box in liquid air separation plant Stainless steel welding wire must be baked at the temperature strictly in accordance with the instructions for use and kept warm before use. Receive welding rod, welders must use the electrode insulation cylinder, and do a good job of anti-aluminium welding wire clean, dry and sealed packaging, otherwise chemical cleaning and drying treatment is required before use. Welding rod grades must be used uniformly and not mixed. Pr...

Jan 25, 2022

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