Nitrogen plant transported abroad Ⅰ

At the beginning of November, 2018, XLA exports a set of skid-mounted unattended nitrogen plant. The whole plant has only two units, cold box and warm end skid. Fractionation column is whole assembled in XLA before delivery out of factory.
Two containers delivery. Except for the cold box, all units can be shipped directly in our self-made warm end. Customers pick up he goods from the port to site by using only two trucks.

(source:https://www.airseparation-plant.cn/nitrogen-plant-transported-abroad/)

The technology of Helium purification recycle plant

The common method of helium purification recycle plant is cryogenic and condensation. In addition, a lot of new technologies in the cryogenic field are also adopted in the plant development process, including vibration reduction of high pressure helium compressor, special welding technology of cryogenic and high-pressure copper pipelines, and cryogenic and high pressure flexible sealing technology, etc., to optimize products. On this basis, making a breakthrough in the purification technology through membrane separation method. A low-purity helium with a purity of 10% or more was purified to more than 99.5% and the recovery rate of system purification was more than 60%.
Features of technology
A new type of recycling plant for waste helium purification manufactured by Chinese enterprises monitoring the purity, measurement, pressure and temperature of helium in the system by using industrial PLC, which realizes the full automation monitoring of the compressor, the drying and purifying device, the purifier and the control valves, and completes the automatic operation of the plant. Fully intelligent, safe and reliable automatic control technology is also a key technology and feature of the project.
Helium purification is an international frontier research field. Methods used include cryogenic condensation, membrane separation, pressure swing adsorption and chemical adsorption. Chinese enterprises on the basis of the research in low temperature, the breakthrough of cryogenic condensation separation research technical bottlenecks, develop industrial helium purification of membrane separation technology and equipment, with international giants to compete in the helium purification technology and equipment, and actively research of composite helium membrane separation and cryogenic separation method, combined with high efficiency and cryogenic separation membrane separation and recovery of the characteristics of high purity helium by membrane separation technology in thick purifying first, and then uses the cryogenic separation technology in fine purification, satisfy multiple needs industrial energy saving and high purity.

(source:https://www.airseparation-plant.cn/the-technology-of-helium-purification-recycle-plant/)

Scope of application-helium

Helium is mainly used for the detection of leakage in medical and military refrigeration semiconductor pipelines, high-precision welding metal, manufacturing deep-sea diving photoelectronics, production of balloon borne scientific research and military, etc.
1.Nuclear magnetic resonance (cryogenic superconductivity) field
Magnetic resonance imaging (MRI) uses the cryogenic superconducting magnet technology requires cooling liquid helium, according to the statistics, nuclear magnetic resonance (NMR) imaging accounted for 34% of the world’s dosage of helium, one of the biggest end use industry. Although demand for magnetic resonance imaging in developed countries is declining, but demand is still strong growth in developing countries, so as to keep the strong demand of liquid helium.
2.Refrigeration (home appliances) field
Helium gas is mainly used for detecting the leakage of condenser, evaporator and pipeline system.
3.Semiconductor, fiber field
Helium is mainly used for protecting gas of germanium and silicon crystal growing in semiconductor industry. Cooling and protective atmosphere gas in fiber prefabrication and fiber drawing processes.
4.Welding shielding gas
Usage: When some metals are heated or melted, an inert atmosphere must be used to prevent them from reacting with oxygen and nitrogen in the atmosphere. A lot of helium is consumed in metal welding. In inert gas shielded tungsten arc welding (TIG), unmelted tungsten electricity, searing metal filler and welding areas are protected by a continuous mixture of helium or helium-argon. The gas mixture used in the welding can be prepared in different proportions by helium and argon. Depending on the welding process, the welding wire and the difference of base material welded, the mixture can be composed differently, and the helium content in the helium-argon mixture is usually 15-70%.
5.Cryogenic engineering
Usage: Due to the chemical inertness of helium and extremely low liquefaction point, it is at all except for extremely cryogenic is close to the ideal gas behavior, and the unit mass of high heat capacity, low viscosity and high thermal conductivity characteristics, so the helium is typically used as the working medium of closed cycle cryogenic refrigerator, cryogenic superconducting magnet in major national science and engineering, and superconducting cavity cooling medium, and the college scientific research experiments, etc
6.aerospace
Usage: In rocket and space vehicle fuel systems, helium is used to clean cryogenic fuel and oxidize tanks, as well as pressurized cryogenic tank liquid surface space to provide pressure for direct delivery of liquid hydrogen and liquid oxygen or only to provide net positive suction pressure to infusion pumps. Helium is often used as a working medium in pneumatic control systems.
7.Automobile manufacturing field
Usage: Helium is used in automobile airbag, air tightness detection of aluminum alloy wheel hub, air conditioning evaporator, compressor and condenser, and application of helium in laser welding of automobile frame.
8.Other field
Physiological and medical treatment, nuclear reactor, electric light source, metallurgy and metal processing technology, analysis and test of carrier gas, etc. This part of gas is generally not recycled.

（source:https://www.airseparation-plant.cn/scope-of-application-helium/）

What does distillation mean?

For two substances of different boiling point (such as oxygen and nitrogen) compositing mixed solution, while after absorbing heat and partial evaporation, volatile composition nitrogen will evaporate more. Mixed steam releases heat and part of it condensates, while composition oxygen which is difficult to volatilize will condensate more. If you make saturated steam with higher temperature and saturated solution mixed, then steam gives off heat to saturated solution. After releasing heat, part of steam will condensate. Solution will absorb heat and part of it will evaporate. When partial steam’s condensation happens, due to oxygen condensates more, so the concentration of lower boiling point composition (nitrogen) in steam would be promoted.
During partial evaporation of solution, owing to nitrogen evaporates more, the concentration of higher boiling point composition (oxygen) will be promoted. If after partial evaporation and partial condensation are executed once, steam of higher concentration nitrogen and solution of higher concentration oxygen mix with solution and steam respectively with different temperature, then partial condensation and partial evaporation happen again, then the nitrogen concentration in steam and the oxygen concentration in solution will be promoted more procedures like this happen more times, then nitrogen concentration in steam will become higher and higher, at last we can achieve the purpose of separating oxygen and nitrogen.The whole press we call it distillation.
Generally speaking, the distillation is making use of different boiling point of two substances, and let the press of partially condensation of mixed steam and partially evaporation of mixed solution repeated, then finally we can achieve the purpose of separation.

（source：https://www.airseparation-plant.cn/what-does-distillation-mean/）