The presentation of two-stage compact air compressor is precisely to help a wide range of users to save consumption. The two-stage compressor can control the speed of the compressor motor by changing the frequency of the power supply through the two-stage contraction adjustment of the two-stage compressor, so as to drive the speed change of the air terminal, complete the large-scale adjustment of the gas production, fully meet the user's gas demand under different working conditions, and improve the gas efficiency. At the same time, because it can complete smooth conditioning, prevent frequent start-up and shutdown of motor caused by changing demand, it can maintain the motor, prolong the service life of the unit, and reduce energy consumption. At present, there are two-stage compaction air compressors in Ningbo, and the average node value of the two-stage compaction air compressor can reach 29.5%. Secondary austerity operation can not only reduce energy costs, but also reduce the impact on equipment, so that the maintenance and maintenance volume will also be reduced, operating costs will be greatly reduced. In addition, under normal working conditions, the motor speed of the two-stage compressor is only 60%-70% of the rated speed, and the noise of the compressor will be greatly reduced.
Secondary screw compressor has so many energy-saving advantages that it is more and more popular in the market, and gradually began to be widely used in all walks of life. Especially in some industries with relatively high energy consumption, the use of two-stage compressor not only reduces energy consumption and consumption cost, but also improves consumption efficiency and product process. The following author will focus on the application of two-stage screw air compressor in some industries.
The rated exhaust pressure of air compressor can be divided into ultra-high pressure (above 100MPa), high pressure (100-10MPa), medium pressure (1.0-10MPa), low pressure (0.7-1.0MPa), ultra-low pressure (below 0.7MPa). In recent years, with the gradual progress of automation level, the application of ultra-low pressure gas sources has become more and more common, such as sewage disposal, dust delivery, chemical fiber and chemical industry. In these industries, the common request pressure is between 0.3 and 0.5 MPa. In the past, ordinary users would buy 0.7 MPa air compressor, which will be reduced to about 0.4 MPa by pressure reducing valve, so there is a phenomenon of low pressure and waste. Nowadays, due to the increasing use of ultra-low pressure air sources, there are also some special ultra-low pressure air compressors on the market. However, due to the deviation of design gas consumption and practice gas consumption or fluctuation of user consumption, it will be difficult to reach differences between air compressor gas production and practice gas consumption. In order to reach the balance between the gas produced by the air compressor and the amount consumed by the users, the method of timing flow or exhaust discharge is usually used to complete the control, which still has a great waste. The most ideal method is to control the air compressor's gas production by two-stage compact speed regulation, so as to achieve more use and more production, less use and less production, and accurate gas supply at constant pressure.
At present, the energy utilization rate of most air compressors in cement enterprises in China is also comparatively low. The common pressure used in cement enterprises is between 0.25 MPa and 0.5 MPa. The selection of the conventional 0.7 MPa air compressor will result in a huge power waste. When the output pressure of air compressor is greater than a certain value, or when the relief valve is automatically turned on, the asynchronous motor will idle, seriously wasting energy; for example, the frequent start-up and stop of the motor will affect the service life of the motor, and the power frequency start-up current of the air compressor is large, the impact on the power grid is large, the bearing wear of the motor is large, and the maintenance of the equipment is large. The use of two-stage screw air compressor can be regulated by PLC and two-stage compressor, which can reduce the power loss of air compressor due to the large amount of air used in a short time and the long-term idling of air compressor, and complete vector gas production and constant pressure gas supply. In the cement industry, the energy-saving effect of using two-stage compact air compressor is very remarkable. For example, the energy-saving efficiency of the Deman two-stage compact air compressor, which was purchased by a cement enterprise with an investment of 1.24 million yuan, is as high as 48.4%, and the annual energy-saving is more than 3.8 million kWh.
This article is dedicated by the friendship of Jinan Air Compressor. For more knowledge, please click on: sincere attitude at http://www.jnjrh.com. Provide you with comprehensive services. More relevant knowledge will be dedicated to you one after another. Please look forward to it.