Problems Existing in Energy Saving Technology of Air Compressor

Air compressor is an important industrial equipment, widely used in all aspects of production and life, air conditioning, cold storage, petroleum industry, chemical industry are inseparable from the air compressor.

However, the air compressor is also a large power consumer, and its operation in production and life will cause a large amount of power consumption, so it is necessary to study the energy-saving technology of air compressor.

[Problems in the operation of air compressor]]

low 1.1 output, high energy consumption. Many industrial air compressors limit the power of the air compressor for energy saving reasons, resulting in the compression capacity of the air compressor being lower than the design value, especially when the load rises in summer, the conveying capacity will obviously decrease. Due to the limited heat dissipation capacity, other equipment in the production line cannot run at full load, thus reducing the production efficiency.

The operation efficiency of the air compressor in parallel operation mode is not high, and the stability is not good. The two air compressors work in parallel. Although the total flow rate can be significantly increased, the working flow rate of a single air compressor is lower than that of a single machine. Therefore, the working efficiency of each air compressor has decreased.

The total compression flow of the two parallel machines is smaller than that of the independent work, and the flow increases after the parallel connection, the pipeline resistance loss will increase, and the safety of the unit will also be affected.

The 1.2 unit is in poor operating condition. This problem is mainly manifested in the air compressor operation cycle is difficult to meet the design requirements, unstable operation in summer, frequent failures, etc. Some air compressor equipment has been running for a long time, and mechanical, electrical, instrument and other components have frequent failures. It is difficult to achieve stable operation without failure for a long time by means of post maintenance, which is prone to failures, resulting in shutdown of the air compressor and affecting production safety.

1.3 operation and maintenance costs are high. The maintenance cost of the old air compressor is very high. When the two machines are parallel, the two groups of air compressors have to spare a set of faulty multiple parts, double backup cost, and also cause redundancy and waste of some spare parts.

Air compressor energy regulation and energy consumption]

air compressors are generally selected according to the actual demand for cooling capacity under design conditions. Under normal circumstances, air compressors work all year round, spanning extreme weather in winter and summer, so they are faced with a relatively complex external environment, and there is inevitably a certain deviation between actual conditions and design schemes, so the power of air compressors should be appropriately surplus.

At this stage, the air compressor energy regulation mainly includes intermittent control operation, suction regulation, cylinder unloading, bypass regulation and stepless speed regulation. Among them, the intermittent operation of the air compressor is a common operation mode. If the ambient temperature is higher than the set temperature, the air compressor will start to run, and the ambient temperature will drop below the set temperature, and the air compressor will stop working.

This working mode is suitable for the situation that the ambient temperature is relatively stable and the load is not large, but in the actual use process, the ambient temperature is not stable at any time. Under extreme weather and complex working environment, various production activities will cause changes in cold load, frequent temperature changes, and frequent engine start and stop, which will cause greater energy waste.

The instantaneous current of the generator will pollute the power grid, increase the fluctuation of the power grid, and the life of the air compressor will also be affected. Therefore, the frequency conversion technology in the air compressor has also been more applications.

Air compressor frequency conversion energy saving]

under certain working conditions, the refrigerating capacity of the air compressor is proportional to the mass flow rate. The basic idea of frequency conversion regulation is to adjust the mass flow rate by changing the speed of the air compressor motor, so as to change the refrigerating capacity of the total unit.

The power consumption of the system is related to the characterization adjustment method, and it is also affected by the cooling capacity of the refrigeration device. The heat load of the refrigeration system is reduced. The cold storage control system will reduce the air compressor speed through the inverter, thereby reducing the refrigerant mass flow and reducing the refrigerant condensation temperature. Increase the evaporation temperature, thereby reducing the total cooling capacity.

Moreover, the speed of the variable frequency motor decreases, the friction work of the air compressor decreases, and the adiabatic efficiency also increases, which is also helpful to reduce the K value. Under the partial load condition, the motor speed of the air compressor decreases and the KQ decreases, which can greatly reduce the power consumption of the system.