The "Thirteenth Five-Year Plan" proposes that in the next five years, energy consumption per unit of GDP, carbon dioxide emissions, and water consumption will be reduced by 15%, 18%, and 23%, respectively. The new situation of my country's comprehensive promotion of energy conservation and emission reduction. Against this background, the average power consumption of a factory in industrial production is 9%, and the compressed air system in some factories even as high as 45% will inevitably become the object of energy-saving work. In addition, most enterprises in our country have insufficient understanding of the energy consumption of pneumatic systems and weak awareness of energy saving, which also aggravates the waste of energy to a certain extent.
There are many factors that affect the energy consumption of the compressed air system, including equipment factors, installation factors, usage factors, etc., here are some of the more frequently encountered factors such as: equipment, temperature, pressure, post-processing and other factors affecting air pressure The impact of machine power consumption.
The general compressed air system includes air compressors, pipelines, air storage tanks, precision filters, refrigeration dryers, suction dryers, etc. The air compressor provides compressed air with a certain pressure and is transported to the air storage tank through pipelines for storage, buffering and cooling. After a part of the water is separated out, most of the water is removed by the refrigerated dryer. After the refrigerated dryer, the general pressure dew point can reach 2. -10℃, particle 0.01μm, oil 0.05PPM; then filter water, oil, solid impurities, etc. through a precision filter to meet the gas consumption standard, some industries have higher requirements for compressed air quality and need to add adsorption drying The machine and multi-stage precision filter make the pressure dew point reach -20~40℃, the particle is 0.01μm, and the oil content is 0.003PPM or even lower.
Energy-saving measures for compressed air systems can be roughly divided into the following five categories:
1. Efficient air compressor
2. Reasonable use of pressure
3. Reasonable installation
4. Reasonable air quality
5. Reasonable selection
Efficient air compressor
The compressor is the heart of the entire compressed air system and has a very large impact on the energy consumption of the entire compressed air system. From early piston compressors to screw compressors, from belt drive to direct drive to coaxial drive ;From gear-driven secondary compression, to permanent magnet synchronous dual-host dual-motor secondary compression. Every product innovation has brought a huge efficiency improvement. According to the "Recommended Catalogue of Energy Efficiency Star of the Ministry of Industry and Information Technology", the two-stage compressor with permanent magnet synchronous dual-host and dual-motor with better energy efficiency currently on the market, the isentropic efficiency can reach more than 86%. Compared with the power frequency machine with direct drive, it can save 30-60% of electricity costs under different operating conditions.
Satisfy the pressure of the equipment
It is well known that the higher the pressure, the greater the energy consumption
The relationship between operating pressure and power: 7bar reduces 1bar to 6bar, about 7% of shaft power (experience formula), such as 37kW shaft power, 1 hour can save: 2.59 kWh, leakage: 7bar reduces 1bar to 6bar, leakage The volume is 7/8, a reduction of 12.5%. If the system leakage is 20%, then save 20%*12.5%=2.5%
Many users use models with a conventional exhaust pressure of 8 kg, and use a pressure of 5 kg, 3 kg or even lower, but they do not know that although the operating pressure is low, it bears the energy consumption required for higher pressure. So choosing an air compressor with the right pressure is the top priority. Equipment demand pressure: Many users do not have a thorough understanding of gas equipment and are seldom trying. With the development of technology, the pressure required by many equipment is greatly reduced than before. If it can be improved for a reasonable pressure, it can also bring a lot of energy saving space