Liquefied air separation FAQ - DEAR Air Separation

Heat transfer by thermal conductivity in liuqid air separation plant

The transfer of heat between parts of an object in direct contact is called thermal conduction. In the case of heat conduction in liquids and solids, the transfer of energy relies on molecular collisions. Heat conduction between solid metals relies mainly on the movement of free electrons. The thermal conduction between gases, on the other hand, relies on the irregular movement of molecules. In thermal conduction, the amount of heat passing through a given area per unit of time is proportional t...

May 09, 2022

Types of problems with purifiers for liquid air separation plants

Brief description of the molecular sieve problem The purifier CO₂ suddenly started to run abnormally and suddenly went out of range in liquid air separation plants, the dew point never changed significantly. The dew point did not change significantly. In order to ensure that the other molecular sieve had enough time to regenerate, the time could not be shortened any further. At this point there was a relatively stable situation with no further deterioration. Check the trend graph for a cold bl...

Apr 28, 2022

What are the requirements for the start-up and operation of liquid air separation plants?

The start-up and operation of liquid air separation plants requires the operator to be familiar with the performance and operation of the systems, machines and equipment in the liquid air separation plants, to be familiar with the process flow diagram of the liquid air separation plants, and to master the operation rules and operating characteristics of the liquid air separation plants. In order to ensure the purity of the product, the operator must be able to improve the quality of the product ...

Apr 24, 2022

What are the properties of molecular sieves in liquid air separation plants?

The molecular sieve used in oxygen generators is the zeolite molecular sieve. It is a crystalline silica and aluminate polyhydric compound. Molecular sieves have a uniform pore size and their main function is to sieve molecules. There are three main types of molecular sieves: A, X and Y. The 13X molecular sieve is the only adsorbent currently used in liquid air separation plants. Any molecules that can be adsorbed on 3A, 4A and 5A molecular sieves can be adsorbed by 13X molecular sieves. It is c...

Apr 20, 2022

Liquid air separation plant circulating cooling water operation and control

According to the daily water quality analysis and laboratory results, supplement the discharge water and control the dosing amount to make it reach the required data index. When the turbidity is >20mgL, increase the amount of drainage water, increase the flow of side filtration, and supplement clean water. According to the current situation of the circulating water system, try to increase the concentration multiple operation to save water and medicine. If the concentration multiplier is g...

Apr 18, 2022

Liquid air separation plant heat exchanger thermal scale treatment

To determine whether the heat exchanger has thermal scale: a. View the last 3 to 6 months of the heat exchanger convergence temperature (gas temperature inlet water temperature) annual convergence temperature rise greater than 2 ℃ per year. b. If the convergence temperature has increased significantly more than 0.5 ℃ per month, indicating the existence of problems. Treatment options. Slight thermal scale (convergence temperature rise less than 0.5℃/month): firstly reduce the concentration of...

Apr 14, 2022

Radiographic inspection technology for valve housing castings for the liquid air separation plant

According to the structural characteristics of the valve casing castings, generally take X-rays or γ-rays as a source of radiation with the technical measures of the way the valve body pressure-bearing parts for radiation detection. The use of radiation detection technology to detect the valve body pressure parts, you can find internal defects in the casting, to avoid casting defects may lead to valve leakage and lead to deflagration or explosion accidents. X-ray inspection is often used...

Apr 12, 2022

Liquid Air Separation Plant Cold Energy Utilization Features

The liquid air separation plant system uses the cold energy to produce liquid oxygen, liquid nitrogen and liquid argon in an air separation system, including an air compression pre-cooling system, an air purification system, an air separation system and a nitrogen circulation system for liquid air separation plant cold recovery. the nitrogen circulation system for liquid air separation plant cold recovery is placed in a separate cold box from the main cold box of the air separation system. the l...

Apr 07, 2022

Liquid air separation plant solutions

Liquid air separation plant solutions Most liquid air separation plant cold energy receiving stations have a peaking role, their use is generally for domestic gas or car refuelling, with high and intermittent periods of gas consumption, for example 1-2 hour peaks in the morning and midnight. If the liquid air separation plant vapourisation plant is intermittent, the plant will not operate continuously. The solution is based on the intermittent use of liquid air separation plant and is character...

Apr 06, 2022

Energy consumption of liquid air separation plants

The energy saving in liquid air separation plants improves the efficiency of the air compressor and consumes energy mainly in the air compressor and the circulating nitrogen press. In liquid air separation plants, the cold volume of liquid air separation plant is utilised in sections. The cold volume in the high temperature zone is pre-cooled by a glycol solution, and the compressed air of the air compressor allows the inlet temperature of each stage of the air compressor to be reduced from the ...

Apr 02, 2022

Investment in liquid air separation plants

Liquid air separation plant cold energy utilises air separation equipment, generally large air separation equipment with 2 combined expanders. The price is around 4 million RMB. The expansion air in the air separation plant is no longer required, so for the internal compression process air separation, the inlet air volume of the circulating booster is reduced by about 40% (from 5.A-2A). The energy consumption of the booster is reduced and the investment is reduced. Liquid air separation equipmen...

Apr 01, 2022

Effective energy analysis of liquid air separation plant cold energy utilisation

Effective energy analysis is an important analytical method for energy systems. liquid air separation plant is a low-temperature liquid mixture with methane as the main component, including nitrogen, ethane, propane and other components, which has a large temperature difference and pressure with the outside world. liquid air separation plant is a low temperature liquid and its temperature rise is accompanied by phase change heat, so its cold energy is divided into sensible heat and lat...

Mar 31, 2022

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