Air compressor: energy saving and operation maintenance of air compressor
Energy saving and operation maintenance of air compressor
Screw air compressor has been widely used in various fields of industrial production, is one of the most widely used power sources. However, there is also a lot of waste of energy, mainly electricity and heat. Through reasonable management, equipment transformation and effective utilization, enterprises can indirectly save energy costs and reduce CO2 emissions every year, with good economic, environmental and social benefits. Suitable for promotion.
I. Equipment status before transformation.
A factory has two 20m3/min screw air compressors and two 10m3/min screw air compressors and so on. Its working principle is a pair of parallel meshing male and female rotor rotating in the cylinder, so that the air between the rotor grooves constantly produce periodic volume changes, air along the rotor axis from the suction side to the output side, so as to achieve the screw air compressor. The rated power of the main motor of 20m3/min screw air compressor is 132KW, and the rated power of the main motor of 10m3/min screw air compressor is 75kW, which are started by Y -δ step-down.
The original system has the following problems:
(1) Although the main motor adopts Y-δ step-down starting, the starting current is still very large, which will affect the stability of the power grid and the operation safety of other electrical equipment.
(2) Air compressor often runs without load, which is not economical and wastes serious electricity.
(3) Large noise during power frequency operation.
(4) Power frequency start has a great impact on the equipment, solenoid valve and other parts of the high working frequency, equipment maintenance costs are relatively high.
Second, the feasibility analysis of frequency conversion transformation.
1. Energy saving Because the factory gas load fluctuates greatly, the frequency conversion control system can accurately control the output of the air compressor according to the demand of the gas system, so as to achieve the purpose of energy saving.
(1) The soft start function of the frequency converter makes the starting current of the air compressor smaller;
(2) When the air compressor is loaded, the motor speed changes due to the change of air supply;
(3) When the gas consumption is very small, the air compressor will be empty, and the energy consumption of the air compressor mechanical and electrical machine of the frequency conversion control system will be greatly reduced (20m3/min air compressor is less than 30kW) under the no-load state. According to the frequency conversion curve (frequency converter test data table provided by the air compressor manufacturer), the average power of the air compressor is about 80kW under load, and about 30kW under no load. According to operational data in 2001, the annual operating time is over 8000 hours and the loading rate is 45%. The average power under power frequency load is about 113kW, and the average power under no load is about 113kW. The quarterly power consumption of frequency conversion load is controlled at 118800 kW·h, saving 77220 yuan (calculated at 0.65 yuan per kW·h), and the annual power consumption in no-load period is 88000 kW·h, saving 57,200 yuan, saving 134,420 yuan in total. The frequency conversion cost of 20m3/min screw air compressor is about 150,000 yuan, which is theoretically feasible.
2. Frequency conversion control system is used to reduce maintenance costs, and the soft start of air compressor reduces the impact on some electrical components and mechanical components. During normal operation, the speed is lower than the rated speed for most of the time, which reduces the working frequency of various related solenoid valves and pneumatic components, prolongs the service life of parts and reduces the air compressor.
3. Reduce noise when the exhaust volume is reduced. The motor runs slowly, and the noise generated by the air compressor is far less than when it is at full speed, which improves the working environment of the operator and is conducive to environmental protection.
Shijiazhuang Compus Compressor Co., Ltd. main products are oil-free air compressor, high pressure air compressor, screw air compressor, air compressor, drilling air compressor, oil-free mobile machine, high pressure mobile machine, drilling machine, two-stage compression screw machine, permanent magnet variable frequency screw machine, mine explosion-proof screw machine, air floating centrifugal blower and so on. At present, the company has established 30 customer service networks and more than 100 dealers in the country, to provide customers with pre-sales technical consultation, machine sales, on-site maintenance, parts supply 4S services. The enterprise's good faith service is well received by users. Adhering to the core concept of "quality first, customer satisfaction", we always adhere to provide customers with high-quality products and technical services, we firmly believe that Compus will become your more reliable partner, and are willing to work with you to achieve glory!