Engineering technology.
Science and technology innovation report on the application of variable frequency screw air compressor in mine Du Xiufeng Kailuan Group Co., Ltd. Jinggezhuang Mining Branch Hebei Tangshan 063026 frequency conversion training technology is a long-term advanced technology Consumption has become the dumb drop card production cost of the next section of the machine in the milk with the rapid development of power electronics technology microelectronics technology and computer control technology, frequency control and programmable controller, the rapid development. Compared with other speed control methods, step-down variable pole slip AC cascade speed regulation, etc., frequency conversion speed regulation has the advantages of stable performance, wide speed range and high efficiency; programmable controller, performance. The price is reasonable. The control circuit with the relay has a great advantage, and many mining equipment has been chosen to replace the more important equipment control. As an important large fixed equipment for mine production, the air compressor consumes a small amount of air, and the amount of air consumed is also changing. In addition, the air compressor is operated at a constant speed, and the generated compressed gas is also constant. So it also caused the loss of energy. Whether it can operate safely directly affects the output and benefits of coal mine production.
Facing the development of coal mine modernization, equipment is constantly updated. Continuous improvement, the old-fashioned piston air compressor plus the traditional low cost, can not effectively meet the economic and safety requirements of mining equipment investment. Our company guarantees the normal operation of production equipment. Energy saving. The energy-saving design and transformation of the original air compressor can achieve the effect of reducing people and improving efficiency. 3, the structure is reasonable and the ideal force balance is achieved. No axial load. Long life; 2 large single capacity. No clearance capacity; 3 low noise and low vibration; 4 load-loading and lean-mixing hybrid control, to achieve the infinite adjustment of air compressor air production, so that energy saving effect is significant; 5 easy to install, no need to install the foundation. Once placed in place, it can be used; 6 using air cooling to reduce the temperature of the pressure fan, saving water loss and equipment investment; 7 units, 0 and intelligent control panel. Choose freely. Convenient to operate the unit.
2 frequency conversion speed principle According to the principle of motor science, the asynchronous motor is the pole number of the motor; 〃 is the slip rate.
It can be seen from the above formula that the synchronous speed of the asynchronous motor is proportional to the power supply frequency, so changing the power frequency can change the motor speed, thereby achieving the purpose of speed regulation.
In the process of frequency conversion speed regulation, the plant 7 in the fixed torque 7 is basically unchanged. As the synchronous speed decreases, the angular velocity of the corresponding magnetic field also decreases. The motor 4 input electromagnetic power decreases by 7.5 and the output power = corpse 17,15. Loss; no, plus. Therefore, the frequency conversion speed regulation is an efficient speed regulation method, and the frequency conversion speed regulation can not only realize the stepless speed regulation. Moreover, according to the load characteristics, the constant torque load should be kept constant = constant; for constant power load should be kept = constant. This keeps the motor running in the high efficiency zone.
3 variable frequency speed control energy saving analysis 3.1 constant torque load application constant torque load is no matter how the speed changes. The load torque is constant, and its formula is as follows: For the speed, it can be known from the above formula that the shaft power is proportional to the speed of the motor, that is to say, after applying the frequency conversion speed regulation, if the motor speed is reduced due to the process requirements, the rated speed is reduced. The 80-inch, the corresponding power consumption is reduced to the original 8 3.2 variable torque load application. According to the basic law of fluid mechanics, the compressor is a variable torque load, and its speed is related to the flow rate 0 pressure 77 and the shaft power is flow and The speed is proportional. The pressure is proportional to the square of the speed, and the shaft power is proportional to the speed of 5; When the motor speed drops slightly, the shaft power will drop significantly. For example, when the flow rate is 80. The corpse is 0.53, that is, the motor shaft power is only about half of the rated power. Therefore, when the frequency converter is applied to a variable torque load such as a compressor, energy can be saved when the flow rate changes, and the energy saving effect is very obvious. 4 The automatic monitoring programmable controller is a novel universal control device. He combines traditional relay control technology with computer control technology and communication technology. Has a strong function. It is flexible and reliable, and it is easy to be compiled into a series of advantages such as simple use, small size, light weight and low power consumption. Our company uses Siemens 87200 programmable controller to control, at the same time. The programmable controller is connected with the background host computer, and the background host computer realizes the automatic monitoring of the air compressor through the configuration software. In order to achieve remote monitoring and relevant leaders to understand the operation status of the air compressor in time. The background host computer uploads the operation of the pressure blower room to the local area network. With permission settings, you can operate remotely or dynamically.
5 The effect after the transformation 1 greatly saves energy. After applying the frequency device, the air compressor changes the speed of the power frequency regulating motor through the frequency conversion device, and then changes the air compressor exhaust volume to provide stable pressure. It is tested that the energy saving effect is obvious when the system uses substantially the same amount of gas.
conserve water. After changing from water cooling to air cooling, water consumption is saved and equipment investment is saved. Greatly reduced equipment maintenance.
The original piston air compressor is water cooled. It consumes 5,000 tons of water per year, and the annual water saving fee is 5,000 fathers 3.45 = 172,500 baht.
Extend the life of the machine. The life of the air compressor is inversely proportional to the speed. After the frequency conversion, the average speed is reduced, the wear is reduced, the speed is slowly increased at the start, and the impact on the equipment is also reduced, so the life is inevitably prolonged.
Simple and flexible control, high response and fast response.
The frequency converter can be flexibly controlled according to the process requirements, the reaction time can reach 0.28, the speed regulation precision can reach 0.5, the speed regulation range is wide, the mechanical characteristics are hard, and it can meet the strict production process requirements.
Achieve unattended, reduce people and improve efficiency Annual income 6 should be noted when using the inverter. 1 Because the inverter generates high-order harmonics, it will cause interference to the motor and surrounding equipment, so it is necessary to install a reactor. 2 running signal interference. The input signal of the inverter is very small and sensitive to interference, so a separate shielded wire must be added during installation. 3 Inverter speed regulation range should pay attention to the general control of 50.70 below 30, the lubrication system is not guaranteed. 4 frequency conversion system power supply and other equipment 7 Conclusion With the rapid development of China's economy, energy shortages and strong market competition has penetrated into every corner of all walks of life. Can the company effectively improve production efficiency? The process saves energy and reduces production costs. It has become an important factor for the survival and development of an enterprise, if the frequency conversion technology is transformed in the enterprise. In addition, the programmable controller 1 and the microcomputer are connected to realize automatic monitoring, and the economic benefits will be considerable.
Designing MCU and Embedded System Applications, 2002 2 Huang Lipei. Change the master skill motor speed 3 pre-rope. The motor drags the base. North machine
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