What classifications of the piston type compressor?
The piston compressor has various kinds of types, and also has different kinds of classification.
It is classified into vertical, horizontal type, angle type, symmetrical balance and contrast-position type according to the figuration of cylinder in the piston compressor.
It can be classified into single stage type, double stage and multistage according to the the compressed series of the piston compressor.
As for the set mode of the piston compressor, it can be classified into mobile type and stationary type.
It can be classified into unloading type and pressure switch type according to the control type of the piston compressor.
How the compressor works?
The theory of the piston compressor works: AS the piston to reciprocate in the cylinder to cyclically change the gas volume of the cylinder.
The crankshaft of the piston compressor rotate a circle, the piston reciprocate once, the cylinder successively complete air inlet, compression and discharge process.
What characteristics of the piston compressor?
The piston compressor has its unique advantages, and it also has disadvantages.
Advantages: A wide range of pressure usage; high thermal efficiency, lower unit energy-consumption; a wide range of discharge; lower requirement of material; mature technology, enriched production experience; simple device system.
Disadvantages: lower rotation, larger and heavy machine;complicate structure, difficult maintenance; interrupted discharge; larger vibration of running.
With the rapid development of China’s economy, the importance and role of industrial gases in the economy have become increasingly prominent. As an important basic raw material for modern industry, gas products have a wide range of applications.
Industrial gases mainly include oxygen, nitrogen, argon, helium, neon, krypton, xenon, hydrogen, carbon dioxide, acetylene, natural gas, etc., involving all aspects of industry. The industrial gases mentioned in this paper mainly refer to the ability to separate and obtain oxygen, nitrogen, and argon through air filtration equipment. Rare gases such as helium and neon can also be obtained by further purification.
Preparation of oxygen, nitrogen, and argon is mainly achieved through air separation equipment. Large-scale air separation equipment is mainly used in coal chemical, fertilizer, petrochemical, metallurgical industries, and IGCC power generation enterprises, while small and medium-sized air separation equipment is mainly used for small and medium-sized metallurgy, Chemicals, building materials, electronics companies.
At present, there are two models for large-scale industrial gas use in China: one is for self-construction, air separation equipment companies only provide equipment, and the other is for outsourcing model, which directly allows air separation equipment companies to invest and build factories in the plant area. Provide gas for the company. With the strengthening of industrial gas market, more and more outsourcing models will be applied.
Would you like to know how to manufacture the industrial rare gas? Although the industrial gas is usually the nitrogen, but it not as rare gas. Nitrogen is air separated, rectified from the air cryogenic liquefied, then the nitrogen and oxygen can be got etc.
Helium is mainly from the natural gas, because its content in the air is too little, some mineral resources of the natural gas contain much Helium. It can be air separated by liquefaction, Helium is one kind of rare resources, it is really little in the earth, it is basically non-renewable resources, the price is increasing recent years.
Certainly, Helium is also got form the air separation, because Helium and neon are really difficult to liquefaction, the small amount of Helium and Neon mixture can be got from air after liquefaction, Helium and Neon can be got form the further separation.
A lot of people do not know what kind of other usage except the inflatable ball, but a lot of analyzers being used on science will use the Helium.
Neon is mainly used on neon light filling, it is mainly manufactured by air separation, although its concentration is really little.
The Argon content is rich in the air, (which is close 1%), it can be easily got from the air separation. So, it is really cheap as a protective gas. This is the reason why the argon arc welding is often to be seen, while not the Helium arc welding or the Neon welding.
Xinglu air separation plant manufacturing equipment–Laser cutting machine.
Suzhou Xinglu Air Separation Plant Science and Technology Development Co.,Ltd. focuses on the research&development, design and manufacture of cryogenic technical field.
The video will show you the air separation manufacturing in workshop.
steel industry is the main power for the development of air-separation industry which lead air-separation industry into its golden time.
According to the oxygen consumption of steel industry, during the process in the blast furnace, converter, continuous casting and rolling of the traditional process, the oxygen consumption of per ton steel is about 120 Nm3/h. Every year millions of tons of steel production scale need match air separation plants with the capacity of 15000 Nm3/h, when not in oxygen-enriched blast furnace can be reduced to 10000 Nm3/h. When using COREX puddling technology, electric converter, continuous casting and rolling steel are installed, the capacity of the spare parts required for each million tons of steel shall be increased to 50,000 Nm3/h, which is three to five times to traditional technology.
Steel industry is the big customer to air-separation worldwide, accounting for 60%~70% of total amount. 60s~80s of last century, the dramatic development boomed air-separation industry. After Japan introduced oxygen converters, the steel output increased from ten million tons to 100 million ton during ten years, the output of oxygen increased 20 times during 16 years. After a detour, China’s steel industry got back on track in the 1980s and exceeded 100 million tons in 1996. 340 million tons in 2005. China became the largest steel country in the world in 2005 with 340 million tons which was more than the sum of the three, Japan, the United States and Russia. And it is expected to be 620 million tons in 2010, more than the sum total of countries that ranked from 2nd to 21st behind.
From 2001 to 2010, due to the rapid development of national economy and the global manufacturing transferring to China, Chinese steel industry promoted developed rapidly. With the average annual output of 46 million tons of crude steel increased, per million tons of supporting air separation unit 15000 Nm3/h, a single steel, need new air separation unit capacity is 690000 Nm3/h.Thus, the gas industry was booming, and the golden period of Chinese air separation was brought forward.
During this period, Chinese air separation industry has followed the world’s advanced level and improves its competitive power. Both software and hardware facilities are ready for the take-off of the air separation industry.
The processes of puddling and steel-making need much oxygen.
Oxygen top blowing converter steel-making
Blast furnace rich oxygen blast
Electric furnace steel-making
Steel processing, continuous casting flame cutting, cleaning and so on, tonnage oxygen consumption is 10 ~ 12Nm3
Nitrogen is mainly used in metallurgical works for sealing gas, conveying gas, protecting gas, stirring gas, blowing gas, instrument gas, etc.
At present, the consumption ratio of oxygen and nitrogen in metallurgical plants is about 1:1, and the nitrogen consumption is also increasing. The nitrogen production should be properly reserved on design.
Argon is used for stainless steel smelting, steel ladle argon lowing, conticaster steel ladle and tundish nozzle sealing, protecting gas, etc.
At present, the energy consumption of argon in metallurgical plants is not very large, about 3 ~ 4.5Nm cubed per ton of steel, usually after the total amount is extracted, spare parts are sold.
Interdependence and mutual promotion is the relationship between steel industry and air-separation industry. Growth of steel industry leads the development of gas industry and the development of gas industry promotes steel industry, which is similar to the closed acting force and counter-acting force. New technologies appeared in steel industry require new quantity, quality and technology from gas industry now and again. To meet the continuous demands of steel industry, gas industry has developed itself and promoted the steel industry forward, which can be noticed when looking back the development of domestic and overseas air-separation industry. Get a clear understanding of the relationship between the two industries is extremely important to gas industry, which can remind us to focus the development trends of steel industry and make or modify industry development strategies. It also help gas industry to research new gas technology combined with steel industry to capture business opportunities and control the market. When the steel industry flags, a clear understanding can adjust the marketing direction in time, improve the old air separation plants transformation and reserve technologies.
After impurity removal, air is taken by compressor and compressed to ~1.1MPa. After cooling down, harmful components, such as moisture, CO2, C2H2 are removed by purifying system.
After purification, compressed air is cooled down by the main heat exchanger and cold refrigerator, and sent to rectification column for rectification. Through sub-cooler, liquid air, liquid waste nitrogen and liquid pure nitrogen are sent to upper column for secondary rectification. In upper column, liquid oxygen at 99.6% is obtained at bottom, which is delivered out of cold box via sub-cooling as product.
Waste nitrogen is drawn from top of upper column. Through heat exchanger, it is expanded to provide coldness to the whole system. After warming up, it is delivered out of cold box and divided into 2 streams. First stream goes to purifying system for regeneration of molecular sieve. Second stream is delivered to pre-cooling system to cool down the cooling water.
While third stream of waste nitrogen delivered out of cold box is compressed by recycle compressor and booster of turbine. Afterwards, it goes into cold box and is cooled down by heat exchanger. Cool gas is expanded subsequently to supply coldness to whole system. After expansion, it is warmed up in heat exchanger and goes for another round of circulation.
The production of argon works on hydrogen-free rectification process specified as following described: Liquid argon fraction is drawn out from the upper column into crude argon column and pure argon column, where liquid argon product is got through rectification.
Eliminated from mechanical impurity by the air filter, the required amount of process air is compressed by air compressor to rated pressure. Afterwards, it goes into water-cooling tower for cleaning and pre-cooling. The removal of harmful components, such as moisture, CO2, C2H2 are carried out by activated alumina and molecule sieve in molecule sieve purifier, which will automatically alternate.
After purification, compressed air goes into main heat exchanger, and cooled down to its dew point temperature. Afterwards, it goes to lower column for primary rectification. In lower column, gas nitrogen is got the top of lower column, and then condensed into liquid nitrogen in evaporator-condenser. Part of liquid nitrogen is sent back to lower column as reflux. Balance liquid nitrogen and liquid air are sent into respective position of upper column via sub-cooler. Through secondary rectification, liquid oxygen is got at the bottom of upper column. After compression by liquid pump to rated pressure, liquid oxygen is warmed up ambient temperature, and delivered out of cold box into oxygen pipe as product. The waste nitrogen via sub-cooler goes to expander for expansion. Warmed up in heat exchangers, it is delivered out of cold box for purifying system for regeneration of molecular sieve.