1. Air conditioning load
Office buildings, shopping malls and some supermarkets and factories have central air conditioning, and the electricity consumption of air conditioning is very large during the peak electricity consumption in summer. In hot weather, the electricity consumption of air conditioners in Beijing, Shanghai and Shenzhen accounts for more than 40% of peak electricity. Therefore, using inverter equipment to drag the refrigeration pump, cold water pump and fan of the air conditioning system is a very good power-saving skill. At present, there are many companies specializing in short-term regulation of electricity in the country, during which the primary skill is frequency conversion speed regulation and power saving.
2. Crusher load
Metallurgical mines, building materials use a lot of crushers, ball mills, this kind of load after the selection of frequency conversion effect is significant.
3. Large-scale kiln calciner load
In the past, most of the large-scale industrial converters (converters) such as metallurgy, building materials, and caustic soda used to use DC and commutator motors, slip motors, cascade speed regulation or intermediate frequency unit speed regulation. Because these speed regulation methods may have slip rings or low power, in recent years, many units have chosen frequency conversion control, which has an excellent effect.
4. Compressor load
Compressors also fall under the widely used class of loads. Low-pressure compressors are widely used in various industrial sectors, and high-pressure large-capacity compressors are more used in steel (such as oxygen generators), mines, fertilizers, and ethylene. The selection of frequency conversion speed regulation brings the advantages of small starting current, power saving, and optimization of equipment service life.
5. Rolling mill load
In the metallurgical profession, in the past, large rolling mills mostly used AC-AC frequency converters, in recent years, the selection of AC-DC-AC frequency converters, rolling mill communication has been a trend, especially in light load rolling mills, the selection of general frequency converters, satisfactory low-frequency load starting, synchronous operation between stands, constant tension control, simple and reliable operation.
6. Winch load
The winch load is selected for frequency conversion speed regulation, which is stable and reliable. The blast furnace winch equipment of the iron plant is the primary equipment for transporting raw materials for ironmaking. It requires stable start-up and braking, uniform acceleration and deceleration, and high reliability. Originally, the cascade, DC or rotor string resistance speed regulation method was mostly used, which had low power and poor reliability. Replacing the above-mentioned speed regulation method with a communication inverter can achieve the desired effect.
7. Converter load
For converter loads, the DC unit is replaced by AC frequency conversion, which is simple and reliable, and the operation is stable.
8. Roller table load
Roller table loads, mostly in the iron and steel metallurgy occupation, the use of communication motor frequency control, can improve the reliability and stability of the equipment.
9. Pump load
Pump load, large volume and wide area, including water pumps, oil pumps, chemical pumps, mud pumps, sand pumps, etc., there are low-pressure medium and small capacity pumps, as well as high-pressure and large-capacity pumps.
Many water companies' water pumps, chemical pumps, reciprocating pumps, non-ferrous metal and other occupations of the chemical pump, non-ferrous metal and other occupations of the use of frequency conversion speed regulation, all of which have a very good effect.
10. Cranes and dump trucks
Cranes, dump trucks, etc. have large load torque and require stability, and positive and negative are frequent and reliable. Inverter equipment can meet these requirements by operating cranes and dump trucks.
11. Wire drawing machine load
Wire drawing machines for the production of steel wires require high-speed and continuous production. The steel wire strength is 200Kg/mm2, and the speed control system requires high precision, high stability and synchronization.
12. Transporting vehicle loads
The raw coal loading vehicle of the coal mine or the molten steel transportation vehicle of the steel mill is very good for the use of frequency conversion technology. Fast start and stop, strong overload capacity, flexible forward and reverse rotation, smooth to the coal surface, correct component (no more or less installation), basically do not need manual operation, improve the raw coal production power, save electric energy.
13. Elevator elevated tour car load
Because the elevator is a person-carrying thing, the drag system is required to be highly reliable, and it is necessary to frequently accelerate and decelerate and rotate forward and reverse, and the progress of the dynamic characteristics and reliability of the elevator has increased the sense of safety, comfort and power of the elevator. In the past, the elevator speed regulation was mostly DC, and in recent years, it has gradually switched to communication motor frequency conversion speed regulation, regardless of Japan or Germany.
14. Feeder load
Metallurgy, electric power, coal, chemical industry and other occupations, there are many feeders, whether it is a disc feeder or a vibrating feeder, the use of frequency conversion speed regulation is very significant. The disc feeder of a factory was originally a slip speed regulation, with small low-frequency torque, many faults, and frequent jamming. After the selection of frequency conversion speed regulation, because it is an asynchronous machine, it has high reliability, power saving, and more importantly, the closed-loop temperature transmitter ensures the accuracy of the transported materials, so as not to cause accidents caused by excessive overtemperature of the oxidant transport, and ensures the orderliness of production.
15. Stacker and reclaimer load
The stacker-reclaimer is the primary equipment for stacking materials in coal yards, wharves and mines, and its primary function is to pile and reclaim. The completion of active stacking and semi-active reclaiming, improve the reliability of the equipment, the equipment runs smoothly, there is no impact and shaking phenomenon, the reclaiming process reverses the speed regulation according to the law of 1/cosφ, and improves the reversing reclaiming power of the bucket wheel and the uniformity of the belt coal transportation, which is very popular with workers.
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