What are the reasons for the power consumption of air compressor

As a commonly used power equipment in the industrial field, the energy consumption of air compressor has always been the focus of attention of enterprises. Based on industry research and actual case studies, the main reasons for the power consumption of air compressor are the following categories:

1. equipment own factors

1. old equipment or backward technology
   • the energy efficiency level of the old air compressor is low, and the internal wear is serious, which leads to the decrease of operating efficiency and the increase of energy consumption. For example, a traditional air compressor that has been in use for more than 10 years can be more than 30 percent less energy efficient than new equipment.
2. Unreasonable selection
   • exhaust pressure too high in order to reserve a margin, some enterprises choose air compressors whose exhaust pressure is much higher than the actual demand, resulting in energy waste.
   • Excessive exhaust air volume: The exhaust air volume of the equipment exceeds the air consumption, and the air compressor is frequently unloaded or idling, increasing invalid energy consumption.
3. Core component performance degradation
   • compressor problems: Blockage of the intake filter element, damage to the air valve, wear of the piston ring, etc., will increase the running resistance and lead to an increase in energy consumption.
   • Cooling system failure: Poor heat dissipation of the cooler, accumulation of scale or insufficient cooling water flow will cause the exhaust temperature to rise, and the air compressor needs to consume more energy to cool down.
4. Low motor efficiency
   • asynchronous motor power factor is low (usually 0.2-0.85), no-load or light load when the energy loss. The old-fashioned air compressor is not equipped with variable frequency speed regulation or reactive power compensation device, which further aggravates the energy consumption problem.

2. operation management issues

1. extensive operation strategy
   • disorderly start-stop: Air compressors can only be started and stopped according to a fixed number of units and cannot be adjusted in real time according to air consumption, resulting in a high proportion of no-load operation time (no-load energy consumption in some scenes reaches 40% of full load).
   • Pressure band set too wide in order to avoid frequent start and stop, set a wide pressure range (such as 0.6-0.8MPa), resulting in long-term operation of the air compressor under high pressure, increasing energy consumption.
2. Manual deployment depends on experience
   • lack of intelligent monitoring system, relying on manual judgment of air compressor start-stop and loading status, it is difficult to accurately match supply and demand, resulting in energy waste.

3. System Leakage and Configuration Problems

1. serious leakage of transmission and distribution network
   • pipeline aging, loose joints or poor sealing, resulting in compressed air leakage of 10%-30% of the total gas supply, more than 50% in severe cases. A leak site can waste tens of thousands of dollars in electricity bills each year.
2. Airflow system design flaws
   • filter clogging: Increase the running resistance of the air compressor and extend the loading time.
   • Unreasonable pipeline layout: Too long pipes, too many elbows or too small pipe diameter lead to increased pressure loss (energy consumption increases by 7%-10% for every 1bar pressure increase).
3. Low efficiency of gas-using equipment
   • the air consumption mode of terminal equipment is unreasonable (such as frequent start and stop, leakage is not repaired), resulting in continuous high load operation of air compressor and increasing energy consumption.

4. energy saving improvement suggestions

in view of the above problems, enterprises can reduce the energy consumption of air compressor through the following measures:

1. equipment upgrade and selection optimization
   • eliminate old equipment, choose high-efficiency screw air compressor or permanent magnet variable frequency air compressor, energy efficiency increased by 15%-30%.
   • According to the actual demand for gas selection, avoid "big horse-drawn car".
2. Application of Intelligent Control System
   • deploy air compressor group control system, automatically adjust the number of operating units and loading status according to the air consumption, and reduce the idle time.
   • The installation of variable frequency speed control device can realize automatic speed adjustment at light load, and the energy saving effect can reach 20%-40%.
3. Strengthen leakage management
   • regularly carry out pipe network leakage detection, repair leakage points, reduce invalid gas supply.
   • Optimize pipe layout, reduce elbow and pipe diameter mutation, and reduce pressure loss.
4. waste heat recovery and utilization
   • when the air compressor is running, 90% of the electric energy is converted into heat, which can be used for hot water supply, process heating, etc. through the waste heat recovery device, and the recovered heat accounts for 70% of the power consumption.
5. Fine operation and maintenance management
   • establish a regular maintenance plan to clean or replace the filter element and lubricating oil to ensure the efficient operation of the equipment.
   • Train operators, standardize equipment start-stop and parameter setting to avoid human misoperation.

Summary: The power consumption of air compressor involves many links such as equipment, management and system. Through technology upgrading, intelligent monitoring and fine operation and maintenance, enterprises can significantly reduce the energy consumption of air compressors and improve economic benefits.