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Below, with examples to talk about the application and efficiency of frequency control device.
1 Pump Load Pump load, wide range, including pumps, oil pumps, chemical pumps, mud pumps, etc., there are low pressure, medium and small capacity, high pressure and large capacity.
When frequency conversion control is used, the number of revolutions of the motor or the pump is reduced, the wear of bearing and other mechanical components is reduced, the sealing system of the pump end is not easily damaged, the failure rate of the pump is reduced, and the maintenance workload is greatly reduced. The constant-pressure water supply frequency conversion system of high-rise buildings, although it is only a simple application of the frequency converter, is very good at satisfying the pressure stability of high-level users' water use and greatly saves energy.
2 fan load fan load, but also a wide range of equipment, widely used in all walks of life, most of the adjustment baffle opening to adjust the air volume, a lot of energy wasted. A refinery's 65-ton/hr medium-pressure boiler is the main power plant for recovery of carbon monoxide produced in the production of catalytic cracking units. Due to the difference in the burning of fuel, the required amount of wind is nearly doubled. To this end, they used frequency converter speed control for boiler fans, removed the windshield baffle, saved 670,000 kilowatt hours of electricity, saved 67.7% of electricity, increased the boiler combustion rate by 1.6 to 2.7%, and saved 989 to 1,628 tons of fuel oil.
3 Rolling Loads In the metallurgical industry, AC frequency conversion has been used in recent years, and rolling mill exchanges are a trend. Especially in light load rolling mills, such as Ningxia National Aluminum Products Factory, a multi-stand aluminum rolling mill adopts a general-purpose inverter to meet the requirements of low-frequency band startup, synchronous operation between racks, constant tension, and simple and reliable operation.
4 The load of the hoisting machine load winch, using frequency control, stable and reliable. Ironworks blast furnace hoisting equipment is the main ironmaking conveying equipment. He demanded a smooth start and braking, uniform acceleration and deceleration, and high reliability. Many of the original use of series, DC or rotor resistance series speed control, low reliability and poor reliability. Using AC frequency conversion to replace the above-mentioned speed control method can achieve ideal results. A steel mill replaced its original DC or rotor series resistor speed control mode with its frequency conversion and braking unit and braking resistor for its 300m3 blast furnace hoisting equipment control system. The accuracy is high, the operation is smooth, the mechanical characteristics are strong, and the material car parking position is accurate and eliminated. The accident of falling off roads has reduced the labor intensity of workers, reduced noise, saved electricity and increased production, and has not failed for many years. The effect is remarkable.
5 converter load converter load, using AC frequency conversion to replace the DC unit is a simple and reliable, stable operation of the speed mode. The tilting of the converter and the raising and lowering of the oxygen gun adopt AC variable frequency speed regulation and drag. After years of production and application, the system operates stably and reliably, and the technical indicators fully meet the technological requirements. The thermal shutdown caused by the main drive system of converters and oxygen lances can be reduced by more than 90%, laying a solid foundation for the stable production of steel mills.
6 Roller class load Roller class load, mostly in the iron and steel metallurgy industry, adopts AC motor variable frequency control, which can improve equipment reliability and stability.
After the transformation of the iron and steel medium-sized plant, the frequency conversion device was used to drive the AC motor and interface with the PLC, resulting in good results. The high precision of the speed regulation improves product quality and equipment reliability. This ensures continuity of production and improves product quality. Due to the good effect of variable frequency braking, mechanical brakes are eliminated. Since the speed is continuously adjustable, a large number of speed reducer devices are eliminated, and the production environment is improved and noise is eliminated. Single power saving, one year and a half can recover the investment of all frequency conversion devices. The frequency converter applies to the roller class load, can adopt a frequency conversion device and technology with more than one cage type electrical machinery.
Application:Freezer, pump water, TV, fan, street light,etc.
Advantage:Easy to install and operate;
Very suitable for scattered rural areas;
Use more accurately because the user is a separate household.
Since the 1990s, the application of AC variable frequency speed control devices in China has grown by leaps and bounds. Because the frequency conversion speed regulation in the frequency range, dynamic response, speed accuracy, low frequency torque, slip compensation, communication functions, intelligent control, power factor, work efficiency, easy to use and other aspects of the past is not comparable to the AC speed control method, It is characterized by small size, light weight, versatility, wide drag area, perfect protection function, high reliability, and easy operation, and is well-received by steel, metallurgy, mining, petroleum, petrochemical, chemical, pharmaceutical, textile, and machinery. Power, light industry, building materials, paper, printing, cigarettes, tap water and other industries are welcome, and the social benefits are very significant. In the field of frequency conversion, our company started earlier, with larger sales and more application load. It can be said that with the growth of China's variable frequency technology.