An air compressor is a special machine used to increase the pressure of a gas to facilitate the delivery and increase the pressure energy of the gas to meet the needs of the production process or power plant. In the manufacturing industry, such as ceramics, glass, toys, clothing, machinery manufacturing, plastics and other industries, most of them need to use air compressors of 10 m 3 / min or more, and even need multiple combinations to meet production. Practice has proved that selecting and using the compressor unit will save the user energy, reduce the cost of use and increase the efficiency. From the test data of the compressor system and the pipe network, there are many ways to improve the power utilization rate of the compressor. The main ones are as follows: 1. Correctly selecting the compressor If you want to build a new compressor system or update the old compressor, you must Pay attention to the selection of the appropriate compressor model, should choose the energy-saving advanced compressor, and its performance indicators should meet the requirements of use. The selection principle is as follows: (1) Understand the performance, scope of use, main parameters and required operating conditions of the compressor product to see if it can meet the requirements of the working conditions. (2) To ensure safe and reliable operation under the working conditions required by the production process, the selection of the working conditions should be based on the selection of the operating conditions, and should not be based on the maximum working conditions. (3) Auxiliary equipments for compressors, such as buffers, gas coolers, oil separators, etc., shall be matched with the main engine and meet the requirements of the use process. (4) Consider the power saving benefit, the investment recovery period is: investment recovery period = p1-p0/p2 <? 1/2-2/3 compressor life cycle p1 - purchase energy-saving (new) compressor product cost conversion value p0 -Reconstruction cost of old compressor after scrapping value p2-year power saving benefit conversion value 2. Improve compressor operating conditions Pay attention to improve the operating conditions of the compressor, arrange the pipeline reasonably, minimize the resistance loss, and strengthen the maintenance and gas management. (1) Improve the inhalation conditions. First, the suction pipe should be designed with sufficient cross-sectional area (for air, the flow rate should not exceed 10-12 m / s), the pipe should be as short as possible, and there should be no sharp turns, and there should be no shrinkage and excess accessories; The second is to reduce the intake air temperature, which can increase the actual air intake of the compressor, and also reduce the specific power consumption of the compressor. The suction port of the compressor should be located in the outdoor cool place. If necessary, take the method of watering and cooling. In addition, for the piston type machine, choose a cooler with high thermal conductivity and easy to clean. The cooler should be cleaned regularly. Practice has shown that for every 3 degrees of intake air temperature reduction, the power consumption of the latter stage is reduced by about 1%. (2) Reduce the pressure loss of the conveying pipe. When designing or installing pipes, the pipe length should be shortened as much as possible, unnecessary pipe fittings such as tees, elbows, valves, etc. should be reduced, and pipe bends or bends with less radius of curvature should be reduced. The filter on the pipeline should have low resistance and can easily remove dirt. The cross-section of the pipeline should be such that the air flow rate is not too large. If the air flow rate is Q m 3 / min, the diameter of the pipe is D>20√Q mm. Generally, the air does not exceed 8-10 m/s. In addition, it is necessary to reduce the leakage loss of the gas. The pressure difference between the inside of the compressor and the outside world may be leaked through the tightly closed parts such as the piston ring, the air valve, and the packing, resulting in loss of the exhaust volume, resulting in an increase in power consumption. 3. Strengthen gas management, rational use of compressed air to implement gas production and gas management for air compressor stations, install gas flow meters for relevant gas stations, calculate gas volume and gas consumption on time, and formulate indicators for assessment. Reasonable use of compressed air to reduce the energy consumption of gas supply can be considered from the following four aspects: (1) Whole gas pressure. At present, in many factories, there is a problem that the exhaust pressure of the unit and the production process are not suitable. The exhaust pressure is often higher than the actual required pressure and should be adjusted. Tests show that the motor input power can be reduced by 5-8% for every 0.1MPa of exhaust pressure when the compressor is fully loaded. (2) Change continuous gas supply to intermittent gas supply. Some enterprises do not match the gas supply and gas consumption time. The compressor runs continuously and the process uses intermittent gas. The compressor is often idling or emptying, which wastes electricity. In this case, the compressor can be timed to stop depending on the gas demand, or a larger gas tank can be set. (3) Arrange the operation of the compressor reasonably. In the case where several compressors are operated in parallel, an economic operation chart of the compressor station should be made to minimize power consumption. By testing or counting the power consumption characteristics of the compressor when operating alone or in parallel, it should be stipulated that the most economical compressor combination has the longest working time, and the least efficient compressor is only used to adjust the load. According to different gas pressures, different combinations of exhaust pressures are used to improve the operating efficiency of the equipment. (4) Increase the load ratio of the compressor. Since the rated displacement of the selected compressor does not match the amount of gas used, resulting in a low motor load rate, it can be considered to use a speed governor for adjustment.
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