1. High no-load energy consumption. At present, the compressor in an enterprise is a single N cube, and the start and stop of compressor is only N or N multiple. The start and stop of air compressor equipment relies on the tradition of manual management. Especially when the gas load changes frequently, the system can not respond quickly, nor can it realize the fine-tuning of compressor displacement. This forms the no-load of each compressor in the air compressor station. Usually, when the pressure reaches ykg, the air compressor enters the unloading operation state. When the pressure drops to xkg, the compressor enters the unloading state. That is to say, the compressor closes the intake valve to make the motor in the idling state. At the same time, the excess compressed air in the oil pre-separating tank is emptied through the emptying valve. Closing the intake valve to make the motor idle can make the air compressor no longer need to compress the gas to work, but the air compressor still needs to drive the screw or piston to do rotary motion during idling, and power consumption is still occurring. The actual test shows that the energy consumption of air compressor in no-load operation is as high as 40%-55% of its full-load operation.
2. Climbing energy consumption is high. There are two operation modes of screw compressor, loading and unloading operation mode or no-load and full-load operation mode. The loading and unloading control mode makes the pressure of compressed gas move back and forth between x kg and Y kg. Xkg is the lowest working pressure value, that is, the lowest pressure that can ensure the normal work of users. In general, the relationship between x kg and Y kg can be expressed by the following formula: y kg = x kg +, and delta is a percentage, and its value is approximately between 10% and 25%. The pressure difference is usually more than one kilogram. Through theoretical calculation and practical testing, it is known that the energy consumption of air compressor increases by 5-6% for every 1 kg increase in pressure. It can be seen from this that, under the control mode of loading and unloading air supply, the working pressure of air compressor is from X to Y, there is an energy consumption of pressure climbing, and there is a de facto waste of energy.
At the same time, before entering the gas terminal, the pressure of the gas above XKG needs to be reduced to close to XKG through the pressure reducing valve. The higher the pressure, the faster the flow rate, which results in the same working condition, and the higher the pressure, the greater the gas consumption. This process is also a waste of energy.
3. Traditional management. There are two unavoidable contradictions in the use and management of air compressor stations. One is that an enterprise has a clear assessment of air compressor managers, so there will be the habit of insufficient air pressure or opening less, which is not conducive to the normal operation of the production line, or the pressure can not meet the requirements of equipment use, leading to the increase of gas terminal failure. One is that there is no clear assessment of air compressor managers, which will lead to more air compressors open, air compressor station no-load energy consumption is high. No matter what kind of management mode, the result will be that the waste of power in air compressor station will increase, and it is not conducive to safe production.
4. Others. When the air compressor configuration of air compressor in air compressor station is defective or the gas consumption at gas end is constantly changing, the supply pressure of pipeline network inevitably produces relatively large fluctuations. This will lead to frequent loading and unloading of air compressors, frequent regulation of intake valves, will accelerate the wear of intake valves, increase the maintenance volume and maintenance, while poor air supply stability, air supply accuracy can not meet the process requirements, affecting product quality.