Air compressor is widely used in chemical plant, crude oil, road transportation, engineering construction, navigation, mining and other industries, and its production accounts for more than 90% of the total output value of refrigeration compressor.
There are various types and forms of air compressors, ranging from small air pumps for small cars and large tractors to large air compressors for splitting mountains and digging coins. The use value ranges from several thousand yuan to several hundred thousand yuan.
It is not only about the rationality of the air compressor, but also how to choose the right type of air compressor.
This paper gives a detailed introduction to these common sense problems.
According to the requirements of national industry standard, the working pressure of exhaust pipe is 0.7MPa.
If it is higher than or less than this working pressure, it is a non-standard special air compressor.
The basic principles of selecting air compressor are rationality, credibility and safety factor.
One is to consider the height of exhaust pipe working pressure and displacement size.
The working pressure of exhaust pipe of refrigeration compressor for general and main purpose is 0.7MPa, which is 0.8MPa in old specification. At present, there is a kind of air compressor with exhaust pipe working pressure of 0.5cpa, which is unscientific from the perspective of application. As the working pressure capacity of pneumatic tools is very small, the distance between gas gathering stations is a little longer, so it can not be applied.
In addition, from the perspective of design scheme, the design scheme of this kind of refrigeration compressor is reduced in the first stage, and the pressure ratio is large, which is easy to cause the exhaust pipe temperature to be too high, resulting in cylinder carbon deposition and safety accidents.
If the refrigeration compressor commonly used by customers exceeds 0.8MPa, it is generally necessary to make the compressor out of production. The method of forced increase is not allowed to prevent safety accidents.
Displacement is one of the basic parameters of the air compressor. The air supply quantity of the air compressor should be consistent with the required displacement, and 10% capacity should be reserved.
If the air supply is large and the displacement of the air compressor is small, the working pressure of the exhaust pipe of the air compressor will be greatly reduced once the pneumatic tool is started, and the pneumatic tool can not be driven.
It is also incorrect to blindly follow the trend in pursuit of perfection and large displacement. As the larger the displacement is, the larger the motor equipped with the refrigeration compressor is, not only is the price high, but also the luxury and waste of purchasing assets, as well as the luxury and waste of coal energy in application.
In addition, when selecting the discharge capacity, it is also necessary to take into account the peak usage, general usage and low tide consumption.
If there is a large amount of usage in low tide period, but the general usage and peak usage are not large, the overseas general method is to use the air compressor with small displacement in series to obtain a large displacement, and start up one by one with the expansion of gas consumption, which will not only benefit the power grid, but also save resources.
The second is to take into account the site and standard of gas use.
If the gas field is narrow (ship and vehicle), the column type should be adopted; if all the long-distance changes of the gas field (more than 500m), portable should be considered; if the application site can not provide power supply system, the diesel engine driver type should be selected; if the application site does not have drinking water, it is necessary to select the air cooler.
In the air-cooled and water-cooled cooling methods, customers often have incorrect understanding and think that water-cooled cooling is good, but it is not.
About 90% of the world's small and medium-sized refrigeration compressors wind chillers account for more than 90%. This is because in the design scheme, the air-cooled type is simple and does not use water resources.
There are four fatal defects in the refrigeration compressor of water cooler
Must have the perfect water supply and drainage system software, the project investment is big;
The cooling tower cycle of water cooler is short;
In northern China, the cylinder is easy to crack in winter;
In all normal operation, a lot of water will be wasted.
The third is to consider the quality of compressed air.
Generally, the air compression caused by air compressor has a certain amount of grease and a certain amount of water. In some places, oil and water are prohibited. At this time, we should not only pay attention to the selection of refrigeration compressor model, but also upgrade the attached equipment when necessary.
Treatment method: one is the use of non wetting refrigeration compressor.
In general, PTFE compressor is not filled with oil.
However, this kind of equipment also has defects, such as poor wetting and high repair rate; polytetrafluoroethylene is also a kind of harmful substance, which can not be applied in food and pharmaceutical industries;
The non wetting refrigeration compressor can only ensure that the gas gathering station has no oil content and can not guarantee no water content.
The second and common way is to add the air compressor (no matter what) to the first or second stage cleaning equipment or air dryer.
This kind of equipment can make the gas of refrigeration compressor have neither oil content nor water content, and the oil content and water flow rate in air compression is less than 5ppm. The processing technology can be considered.
The fourth is to consider the safety factor of refrigeration compressor operation.
Air compressor is a kind of equipment in pressure relief work. With temperature and working pressure, the safety factor of its operation should be put in the first place.
The State implements the normative "two certificates" rules and regulations for the production and manufacture of refrigeration compressors, that is, the production license of refrigeration compressors and the production license of high-pressure vessels (air compressor storage tanks).
Therefore, in the purchase of refrigeration compressor goods, to strictly check the "two certificates.".
Generally, in order to ensure that the product quality of a certified manufacturer is sound, it is not easy to have major product quality problems. Even if there are some problems, the manufacturer will bear the three guarantees.
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