At present, there are a total of pressure fans in the Fangezhuang Mine in Kailuan. The distribution is 4 in the well, 3 in the horizontal wellhead, 2 in Nanshimen and 2 in Nanshimen. All are products of the 1980s and 1980s, the model is 5.5408 piston air compressor, the motor power is 250, and the displacement is 40. Therefore, the control methods of the pressure fan are all direct control methods, and the control method is simple and backward, which is not conducive to maintenance. The operation noise is large and the energy consumption is high. It is extremely urgent to promote screw air compressors and carry out automatic transformation of energy-conversion energy-saving. Energy consumption analysis of the old air compressor operation After the pressure reaches the minimum value, the original control mode determines that the pressure will continue to rise until the maximum pressure value. During the pressurization process, more heat is released to the outside, resulting in loss of electrical energy. On the other hand, the gas above the maximum pressure enters the pneumatic component and its pressure needs to be depressurized through the pressure reducing valve. This process is also an energy consuming process. When the pressure reaches the maximum pressure, the air compressor is depressurized by the following method to close the intake valve to make the motor idle, and the excess compressed air in the separation tank is vented through the vent valve. This adjustment method causes a great waste of energy. According to our calculations, the energy consumption of the air compressor when unloading is about 10,25 when the air compressor is fully loaded, which is still the case when the unloading time is not large. In other words, the time of the air compressor 20 is in an idle state, and no work is being performed. Obviously, under the air supply and unloading control mode, the air compressor motor has a large energy saving space. 2 air compressor automation transformation introduction overall program frequency conversion + redundant automatic control + remote monitoring. Real-time monitoring of parameters such as active and reactive power. The system should have Ethernet communication capability to access the integrated automation system, and at the same time add a remote monitoring system to realize that the pressure fan system center can be set in the integrated dispatching room or the underground dispatching station. Using industrial Ethernet technology, real-time online detection of the operating state of the pressure fan is realized through the configuration software, and the following functions are realized. 2.3.1 Operation status parameters are displayed, and the local area network is shared. 2.3.2 Fault monitoring, which is convenient for management personnel to handle and schedule in time. 2.3.3 Remote start and stop. 2.3.4 With the pressure air line sensor to achieve online monitoring of the pressure pipe network. 3 Analysis of the advantages of the system after the transformation The frequency converter is controlled by pressure, that is, it maintains a constant value, so that the number of pressure turns, the power reaches dynamic matching, and the stable operation is performed under the set pressure. Due to the small change in wind pressure amplitude, the wind load is stable, the air supply quality is good, and the production efficiency is high. In the current working situation of the upper and lower pressure fan room, when the air volume is increased, two pressure fans are required to work at the same time. When the air volume is reduced, only the opening is required to meet the requirements. Therefore, the following scheme is designed. A pressure transmitter is arranged on the gas storage tank to detect the pressure of the gas storage tank, realize closed-loop control of the system pressure, and automatically adjust the speed of the air compressor and the number of air compressors. After the transformation, the air compressor station control system consists of two basic systems, namely constant voltage variable frequency speed control system and redundant control parameter monitoring and management system. When the system is working, the pressure transmitter 8 converts the manifold pressure into an electric signal, and the 10 controller compares with the pressure set value, and the difference magnitude is calculated according to the given control mode, and the control signal is sent to the frequency converter and , control system, frequency converter controls motor speed, control system controls the number of air compressor running, so that the actual pressure is always close to the set pressure. When the gas compressor is running, the single air compressor frequency conversion operation maintains constant pressure air supply, with wind When the operating air volume of the system is insufficient, the operating frequency of the inverter increases to 50. The original frequency conversion air compressor automatically delays to the power frequency operation, and the inverter starts another air compressor to maintain the constant pressure air supply. Both air compressors are started by the frequency converter to achieve a soft start with load, which avoids the start of the inrush current and the mechanical shock caused by the start of the air compressor. The system cyclically loads the soft start cycle stop working mode, which realizes continuous adjustment of the gas supply quantity and ensures the stability of the manifold pressure. System 1. Under normal circumstances, the air compressor is set to 7 when the gas consumption is small, the frequency of the inverter is set at 39.542.5 Hz, and the supply pressure is basically maintained at 0.69 MPa. The purpose of implementing automatic control is to centrally control and automatically detect various parameters during the operation of the air compressor to realize the automatic operation of the air compressor system, to achieve unattended operation, improve the safety factor of the equipment, and reduce the labor intensity of personnel. In combination with the current electric control system of the existing air blower of our company, it is necessary to transform the main body on the existing basis, adopt new electric control cabinet, adopt, redundant technology, add new type of sensor and electric valve to realize the pressure on the pipe network. Fan-level pressure motor temperature fan noise fan temperature compressed air temperature cooling water temperature cooling water flow voltage and current use frequency conversion operation, the noise of the machine room is significantly lower than the use of power frequency operation, the noise will be significantly reduced, greatly improving the working environment. Use variable frequency operation and press the start button to operate the unit. The traditional unloading valve control is eliminated, and the cumbersome operation procedure is omitted. At the same time, two motor cycle soft start can be realized, and the large current impact on the grid when the motor is started is eliminated. After adopting the frequency conversion speed regulation, when the air compressor is running at a low speed, the lubricating oil consumption becomes smaller, that is, the so-called low rotation speed and low lubrication. The frequency converter maintains a constant value, so that the pressure and speed, the power reaches dynamic matching, the number of revolutions is significantly reduced, the mechanical wear is reduced, and the service life of the equipment is prolonged. After the transformation, the model 850 screw air compressor is selected, the motor power is 2508, the exhaust volume is 0, 421.4 pressure fan rooms, and each pressure fan room is equipped with two sets. According to the current mine air volume calculation, each air compressor room is calculated. Run 1 set, calculate the actual frequency conversion control energy saving of 20 or more with frequency conversion energy saving benefit 20, then save 3,600 yuan of energy per day after transformation after daily use, calculate the average electricity price 0.5 yuan 0, save electricity cost 1800 yuan per day, The annual production days are 330 days, and the annual electricity cost can be saved by about 594,000 yuan. Inverter manual. The principle of automatic control. He is a mechanical and electrical engineer in the industrial enterprise of Kailuan Energy Chemicals Co., Ltd. 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