What is the relationship between the type of inverter and load, why use the inverter? 1, fan-type load Fan-type load, the amount of large equipment, steel, power plants, nonferrous metals, mining, chemical, pharmaceutical, subway, textile, chemical fiber, cement, paper and other industries more applications. In the past, most used to adjust the damper opening to regulate the air volume, waste a lot of power. Using frequency control, can save energy, but also reduce mechanical wear and tear, extend equipment life. Daqing Xinhua Power Plant 200MW generating units, boiler induced draft fan 1250kW / 6kV two. Adopting the technology of variable frequency speed control to drag the high-pressure induced draft fan, which is the first time for the large-scale power plant in our country to adopt the frequency conversion to adjust the speed. The test was made by Heilongjiang Electric Power Academy. The generator set under the rated condition (active load 200MW) , From the original 1790.4kW dropped 28.02%, the active load of 80 ~ 180MW operation decreased by 30% to 56.3%. Shijiazhuang 65t / h medium pressure boiler induced draft fan using frequency control, the annual saving 670,000 kW · h, saving rate of 67.7%, the boiler combustion rate increased by 1.6%, saving fuel oil 989t. Because the fan has a resonance point at a certain frequency, attention should be paid to the frequency hopping function of the frequency inverter. 2, pump load Pump load, the amount of large surface, including pumps, pumps, chemical pumps, mud pumps, sand pumps, etc., a low-voltage small capacity, there are high-pressure high-capacity. Maoming Petrochemical Company Refinery has distillation, cracking, catalysis, hydrogenation, furfural, ketone stupid more than 20 production lines using 161 sets of frequency control devices. Inverter total power of 8091kW. Of 30 pumps tested, the same process conditions, the use of control valve power consumption 999.9kW, while the use of frequency control power consumption of 396.7kW, saving 603.2kW, saving rate of 60.3%. The use of variable frequency control, the motor and pump speed decreased, so that bearings and other mechanical components to reduce wear and tear, pump-side sealing system is not easy to damage, reduce the motor failure rate, greatly reduced maintenance workload. As a result, many water utility pumps, chemical and fertilizer chemical pumps, reciprocating pumps, non-ferrous metals and power plants and other industries mud pump frequency control, have produced very good results. 3, compressor load compressor is also a widely used type of load, low-pressure compressors are widely used in various industrial sectors, and larger capacity. High-pressure high-capacity compressors in steel (such as oxygen), mines, fertilizers, ethylene, etc. have more applications. The use of frequency control, are brought to start a small current, power saving, optimization of equipment life and so on. For example, when Sinopec Corp promoted the extinguishing of the torch in the petrochemical production process and eliminated the often bright lights and reused resources, the inverter was used to drive the compressor so that the pressure and flow of the gas would be controlled smoothly. Such as Tianjin Petrochemical Company inverter, the operating current dropped from 100A 50A, saving 50%. Another example is the mixed gas compressor in the steel production process, which is pressurized from the blast furnace and coking gas mixture from about 2.5MPa up to 8.5MPa, to supply steel, sintering and other gas load. Pressing machine outlet pressure must be stable, otherwise there will be waste or even accidents, and in the past generally used manual "hit back flow" and increase / decrease the pressure unit to adjust the way to regulate the export pressure of the press. Not only waste a lot of energy, but also can not guarantee a constant pressure. Lianyuan Iron and Steel Company Power Plant using frequency control automatic adjustment program, through the pressure closed loop real-time adjustment of the pressure motor speed, thus ensuring the constant pressure of the exporter. Improve the overall efficiency of equipment. 4, the central air-conditioning load due to the progress of urbanization, increased the amount of central air-conditioning in the hot season, the central air conditioning power consumption accounts for almost hotels, shopping malls, supermarkets, offices, railway stations, airports 50% of electricity consumption is electricity An important aspect, especially in the south. Intelligent expert system using frequency conversion technology of central air-conditioning refrigeration pumps, cooling pumps, fans speed, will be more than 30% of the energy-saving effect. After the renovation of the central air-conditioner of Windsor Hotel in Shenzhen City, the electricity is saved by 60% and the costs are recovered in 6 months. In the central air-conditioning energy-saving transformation, the main approach is to freeze pump, cooling pump, fan speed, the system temperature, pressure, flow, cooling, electricity and other parameters of the instantaneous value through PID, Interface reasonable control and achieve the purpose.
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