Uses of compressed air classroom knowledge .

With the rapid development of the national economy, compressors are widely used in the industry. Compressors are known as "general purpose machinery" because of their versatility. According to the different characteristics of the use of compressed gas, it can be divided into the following types:

1. Compressed air as power:

For driving all kinds of pneumatic machinery, the exhaust pressure of pneumatic tools is 7 8 kg square centimeters; It is used for control instruments and automation devices, and the pressure is about 6 kg square centimeter; The vehicle is automatic, the doors and windows open and close, the pressure is 2 4 kg square centimeters; agitation in the pharmaceutical industry, in the winemaking industry, with a pressure of 4 kg cm²; The weft blowing pressure in the air-jet loom is 1 2 kg square centimeter; The starting pressure of medium and large diesel engines is 25 60 kg square centimeters; fracturing of oil wells with a pressure of 150 kg cm²; "Quadratic" oil production, the pressure is about 50 kg square centimeter; The pressure of high-pressure blasting coal mining is about 800 kg square centimeter; It is powered by pressurized compressed air in the defense industry; The sinking and floating of submarines, the firing and driving of torpedoes, and the salvage of wrecks are all powered by compressed air at different pressures.

2. Compressed gas is used for refrigeration and gas separation

The gas is compressed, cooled, expanded and liquefied for artificial refrigeration (refrigeration, air conditioning, etc.) such as ammonia or freon compressors. Its compression pressure is mostly 8 12 kg square centimeters, and this type of compressor is usually called a "chiller" or "ice machine". In addition, if the liquefied gas is a mixture, each component can be separated separately in the separation device to obtain various gases that can be read by qualified lip reading.

For example, pure oxygen, pure nitrogen, and pure xenon, krypton, argon, helium and other rare gases can be obtained after air liquefaction and separation.

3. Compressed gas is used for synthesis and polymerization;

In the chemical industry, gases are compressed to high pressures, which are often beneficial for synthesis and polymerization. For example, nitrogen and hydrogen to ammonia, hydrogen and carbon dioxide to methanol, carbon dioxide and ammonia to urea, etc. In the chemical industry, for example, high-pressure polyethylene has a pressure of 1500 to 3200 kg square centimeter.

4. It is difficult to compress gas for hydrorefining of oil

In the petroleum industry, hydrogen is heated by artificial methods, and reacted with oil after pressurization, which can crack the recombinant components of hydrocarbons into light components of hydrocarbons, such as the lightening of heavy oil, hydrorefining of lubricating oil, etc.

5. Gas delivery

The compressor used to transport gas in the pipeline determines its pressure depending on the length of the pipeline. When sending remote gas, the pressure can reach 30 kg square centimeter. The bottling pressure for chlorine is 10 15 kg sq cm and the CO2 bottling pressure is 50 kg 60 sq cm.

Examples are as follows:

1. Liquefied gas.

2. Blowing cylinders in glass factory.

3. Explosives are released in the mine hole.

4. Production of plastic factory.

5. Rocket launch.

6. Cheer up the ball.

Compressed air is injected into the ball, and the more air you have, the harder the ball becomes; When compressed air is injected into the tire, the tire can bear a certain weight. In large cars, doors and brakes are opened and closed with compressed air; The hydraulic press uses compressed air to pressurize the water, and in the factory, the compressed air is used to start the air hammer to strike the iron; In coal mines, it can drill holes with a pickaxe. It is also used for pipelining the transport of liquids and granular objects.

The technology of air compression was first utilized by ktezibios. As far back as 2,000 years ago, he built a compressed air run. A rubber is used to drive the piston inside the barrel to compress the air to increase the force and produce a longer range of the cannon.

But the technology of applying air compression did not have significant achievements until about a hundred years ago. For example, the use of air to operate the drilling of tunnels is not only not dangerous, but also can be operated at room temperature. In the development of mechanization and automation in the past 20 years, he has a particularly deep understanding of the use of compressed air components as an effective tool to promote the rationalization of plants.

There are already many tasks that benefit from pneumatic devices, and the range of industries is increasing.

Common examples are bicycle pumps, as well as car wheels, which are filled with compressed air. The air suspension of the car also uses the principle that air can be compressed.

The oxygen generator first uses an air compressor to compress the air, and then uses an adsorbent to absorb the nitrogen in the compressed air, and the remaining oxygen is output to achieve air separation. Furniture painting is also done with a compressor to compress the air, and then the compressed air comes into contact with the paint to drive the paint to spray out.

Drying of compressed air usually refers to the process of removing moisture from the air, while purification of compressed air often refers to the removal of other pollutants other than water from compressed air.

Compressed biscuits, compressed towels for clothes.

Air conditioners, refrigerators, etc.

Nitrogen is prepared in industry, which is prepared by compressed air, of course, this is industrial 1: household liquefied petroleum gas is liquefied at room temperature using the method of compressed gas volume, and stored in steel tanks, and the same is true for liquid lighters. Liquefied oxygen is separated by collecting air according to the boiling point of the gas, reaching various boiling points.

Example 2: The liquid fuel and oxidizer on a rocket are obtained by using the compressed gas volume method at a fairly low temperature. Example 3:

In the condenser of the refrigerator, the steam of freon sent from the compressor becomes liquid, and the gas is liquefied by compressing the volume and the heat is released. Example 4: Butane gas in a lighter.

Crafting compressed gas.

Gas compressibility coefficient inquiry.

A full set of formulas for high school chemistry.

Compressed air inflation time.

What gases will become solid.

Non-ferrous metal smelting and manufacturing: mainly used for power execution, instrument gas, spraying, etc. Rubber & Plastic Products:

It is mainly used for power execution, instrument gas, and plastic is also used in the blowing process. Aerospace industry: Because compressed air can not only withstand radiation and high temperature, but also withstand large acceleration speed, it has been widely used in the control of aircraft, rockets and missiles in modern times.

Military and chemical enterprises: It has been widely used in the transportation of chemical raw materials, the filling of harmful liquids, the packaging of explosives, and the automatic control devices of torpedoes. <

1. Non-ferrous metal smelting and manufacturing: mainly used for power execution, instrument gas, spraying, etc.

2. Rubber and plastic products: mainly used for power execution and instrument gas, and plastics are also used in the bottle blowing process.

3. Aerospace industry: Because compressed air can not only withstand radiation and high temperature, but also withstand large acceleration speed, it has been widely used in the control of aircraft, rockets and missiles in modern times.

4. Military and chemical enterprises: a large number of applications have been used in the transportation of chemical raw materials, the filling of harmful liquids, the packaging of explosives, the automatic control device of torpedoes, the automation equipment of ships, and oil drilling and production.

5. Transportation industry: the application of pneumatic devices such as brake brakes of trains, lane change devices of rails, opening and closing of vehicle doors and windows, automatic control of subways, automation equipment of ships, maintenance of aircraft, inflation of automobile hovercraft, loading and unloading of wharves, etc.