1 Introduction 35 press is the main power equipment of coal mines, which has long running time and large motor power. It is the main energy-consuming equipment for coal mine production. For a long time, the air compressor directly adopts the step-down start to work in the constant speed operation mode under the power frequency. At the same time, in order to ensure the pressure of the gas in the fixed pivot, the air compressor should change the operation mode according to the demand of the gas, from time to time. The ground enters the no-load operation and frequently starts, causing a large amount of energy waste. The application of the variable frequency closed-loop regulation control system on the air compressor can change the previous operation mode and improve the energy utilization rate. Especially in the current power shortage situation, the application of the frequency conversion speed regulation technology can reduce the operating power consumption of the air compressor. Has good economic and social benefits.
2 The basic principle of the variable frequency closed-loop regulation control system 2.1 System composition The system consists of the power switch cabinet frequency converter intelligent, 3 regulator wind pressure sensor and the on-site air compressor to form a complete closed-loop adjustment control system. The power switch cabinet is installed in the system to keep the original step-down control cabinet as a backup to ensure the reliability of the air compressor operation. The system consists of 1.
2.2 Basic working principle When the air volume is constant, the output pressure of the compressor is proportional to the moving frequency of the cylinder. The larger the moving frequency of the cylinder, the larger the output pressure. Otherwise, the smaller the moving frequency of the cylinder, the smaller the output pressure. . The frequency of movement of the cylinder is proportional to the speed of the motor. The frequency is supplied by the rotational speed f of the AC asynchronous motor.
It can be known that as long as the power supply frequency of the phase AC motor is changed, the motor speed 〃 can be changed very conveniently, and the movement frequency of the cylinder of the air compressor is changed, thereby changing the gas pressure outputted by the air compressor, and adjusting the output of the air compressor. The purpose of gas pressure.
The frequency conversion closed-loop adjustment control system detects the wind pressure of the air supply pipe network of the air compressor through the wind pressure sensor, and still adjusts the regulator, and the 3 regulator outputs a current signal according to the set pressure, and sends it to the frequency converter, when the sensor When the detected pressure is greater than the set pressure, the output signal of the melon regulator is weakened, the output frequency of the variable speed governor is lowered, the air compressor speed is decreased, and the output wind pressure is decreased; when the pressure detected by the sensor is less than the set pressure, 3 The output signal of the regulator is enhanced to increase the output frequency of the inverter and increase the speed of the air compressor. The output wind pressure is also increased to achieve the purpose of automatically controlling the wind pressure.
3 Feasibility analysis The air compressor is the largest electricity user in the mine, accounting for about the total electricity consumption of the production and leaving 20 design allowances. In fact, most of the time the air compressor is not running under full load, there is a large surplus. Therefore, the potential for saving electricity is great.
For a long time, the air compressor directly adopts the frequency sensitive varistor step-down starting method. The starting current of the motor is 34 times of its rated current. The starting current of one of your 130 motors reaches more than 600 people. Under such a large starting current impact, The service life of the motor is greatly reduced. At the same time, the mechanical impact during starting is easy to damage the bearing parts of the mechanical parts of the air compressor, thereby increasing the workload of maintenance and maintenance materials.
In order to ensure that the supply pressure of the pipe network is within the fixed range, the air compressor should change the operation mode according to the demand of the gas equipment, and enter the no-load operation from time to time. This not only causes a large amount of energy waste, but also the air pressure intermittent. Unstable, affecting the use of gas to set axe (4) frequency conversion closed-loop adjustment control system has the following advantages, the interference of the power grid is small. The frequency converter is used to realize the sliding non-impact starting motor. The starting turbulence is small, and the interference of the starting air supply to the grid is eliminated. Adopting the frequency conversion closed-loop adjustment control system, the ridge network card can stabilize the stability of the gas setting valley under the set pressure, and improve the use of the working quality air compressor. The air compressor realizes the soft start function and eliminates the instantaneous mechanical shock of the start. At the same time, operating in the variable frequency state, the pressure regulator of the air compressor becomes backup operation and protection. The number of actions is greatly reduced and the failure rate is reduced. This extends the life of the device.
The ring was changed and the frequency control technology was applied. The air compressor started smoothly and no noise, which greatly improved the working environment.
In summary, in order to capture, the operation quality of the air compressor, save power consumption and material consumption, improve the reliability and 1 level of each transport. According to the technical requirements of the field equipment, the frequency conversion closed-loop adjustment control system is used to carry out the power-saving technical transformation of the air compressor to achieve the thrift and extension of the mechanical components of the 屯2 force machine and the air compressor. The life of the valve is such that the air compressor can operate under economical and reliable conditions.
4 power saving effect estimation Take the 208 type air compressor used in Xianting Mine of our company as an example. The rated exhaust capacity of the single machine is 20 mountain equipped with 1278 甩 motor. Rated power where = 130 both. According to 1 often 1. production, seeking, air compressor daily operation 乜 2 of them full load operation, 8 at 90 load operation, 2 at 60 load operation using frequency conversion closed-loop adjustment control system 矜 1 stable air pressure is 0.7 frequency is estimated by 46 out When the air compressor adjusts the unloading valve through the pressure regulator, the motor power consumption is estimated according to 1009870, the annual running days are 300, and the fan type operating proportional law is P motor running power n motor running speed mountain type 1 2 It can be known that according to Equation 3, the annual power consumption is adopted when the inverter closed-loop regulation control system is used, and the air compressor adjusts the relief valve through the pressure regulator. The annual energy saving frequency closed-loop adjustment control system can save electricity costs 33.27 million 7 pairs of air compressors per year. The frequency conversion closed-loop adjustment control system technical transformation requires a capital of 8.07 yuan, and the investment recovery period is about 2.5. 5 Conclusion Through the feasibility analysis and power saving effect estimation, it is considered that the air compressor 1 enters the room frequency conversion closed-loop adjustment control system technical transformation. The power saving effect is good, the gas supply pressure is stable, the service life of the equipment can be prolonged, and the working environment can be improved at the same time. The reliability and automation of equipment transportation can be described as the whistle and more = the mechanical and electrical major of the coal industry school. Now Fujian Yongan Coal Industry Co., Ltd. is engaged in the management of electromechanical technology. Published many papers. 05987366624.
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