Generally, a device that converts power-frequency AC power with a fixed voltage and frequency into AC power with variable voltage or frequency is called a “frequency converter”. Among many motor speed regulation technologies, frequency conversion speed regulation of AC motors has become the main method of electric transmission because of its advantages of high precision, large torque, strong function, high reliability, and high power.

frequency converters used

At present, frequency converters have been widely used in light and heavy industry production and people’s daily life. In steel, non-ferrous metals, petroleum, petrochemical, chemical, chemical fiber, textile, machinery, electronics, building materials, coal, medicine, paper, injection molding, cigarettes, elevators (including escalators), driving (including port cranes), urban water supply (including sewage Processing), central air-conditioning and household appliances and other industries are widely used.

Inverters are widely used. According to the voltage level, they are divided into low-voltage inverters and medium-high voltage inverters. The purposes and requirements of applications in various industries are different.
Petroleum: oil transfer pumps, electric submersible pumps, water injection pumps, pumping units, etc.
Chemical industry: extruders, film conveyors, mixers, compressors, blowers, sprayers, pumps, etc.
Iron and steel: rolling mill, roller table, fan, pump, crane, ladle car, converter tilting, etc.
Metallurgical industry: rolling mills, roller tables, blast furnace fans, pumps, hoisting machinery, blast furnace feeding, steel mill polishing, etc.
Steel rolling line: drawing machine, coiling machine, blower, pump, hoisting machinery, cut-to-length, automatic feeding.
Construction: elevators, conveyor belts, air conditioning equipment, blowers, pumps, etc.
Electricity: Blowers for boiler drums, water feed pumps, centrifugal mixers, conveyor belts, pumping power stations, flywheels, etc.
Mining industry: mud pumps, conveyor belts, hoists, cutting machines, digging machines, cranes, blowers, pumps, compressors, etc.
Transportation: electric vehicles, electric locomotives, ship propulsion, air compressors, cable cars, etc.
Cement: rotary kiln, hoisting machinery, blower, pump, main drive motor, conveyor belt, shaft kiln fan, etc.
Paper industry: paper machines, pumps, pulverizers, fans, mixers, blowers, etc.
Electronic manufacturing: air compressors, injection molding machines, central air conditioners, fans, pumps, conveyor belts, etc.

frequency converters used

Take the coking plant as an example to illustrate what kind of occasion the frequency converter is used for:
1. The function of the boiler induced draft fan is to form a negative pressure in the flue and draw the flue gas into the chimney. This negative pressure is wasteful, but it cannot be done without. It is also related to the combustion situation of the boiler. Frequency conversion can stabilize the negative pressure.

2. Boiler feed water pump, because the boiler water level is fluctuating, so when the water level is low, increase the frequency to increase the feed water flow to prevent water shortage; when the water level is high, reduce the frequency to prevent the water level from entering the steam pipe when the water level is too high.

3. The function of the gas fan is to compress the gas produced by the coke oven into the gas cabinet and supply gas to the user. The frequency can be adjusted according to the user’s gas consumption to stabilize the pipeline pressure.

4. The running drive of the coal loading car/coke pushing car/smoke guide car/coke quenching car (collectively referred to as the four major cars), because the frequency conversion control is smoother and more stable without impact, and it is convenient to align with the furnace door (plus devices such as encoders) It can also realize automatic alignment).

5. Dust removal fan (this is a high-voltage motor), this is for energy saving and production needs. Due to the needs of the production process, dust removal is required every 20 minutes or so. The power of the fan is 560KW. If it takes 1 minute to accelerate from 0 to the required speed, it is obviously unreasonable to restart it every time dust removal is needed, and then stop it when it is used up. It cannot keep up with the needs of production, and the high-voltage motor is not allowed to be short-circuited. Time starts and stops repeatedly. The high-voltage inverter solves this problem. When there is no need for dust removal, it runs at a low speed of 15HZ. Once the dust removal command is issued, it quickly accelerates to 50HZ to meet production needs, and then continues to stand by at low speed to save energy.

6. The coal loaded into the coke oven is actually mixed coal (that is, 4 types of coal are mixed in proportion), and there are 4 feeders in the lower part of the 4 coal bunkers driven by frequency converters. With belt scales, frequency modulation can achieve precise proportioning. Stabilize product quality and improve economic benefits.

Generally, a device that converts power-frequency AC power with a fixed voltage and frequency into AC power with variable voltage or frequency is called a “frequency converter”. Among many motor speed regulation technologies, frequency conversion speed regulation of AC motors has become the main method of electric transmission because of its advantages of high precision, large torque, strong function, high reliability, and high power.

frequency converters used

At present, frequency converters have been widely used in light and heavy industry production and people’s daily life. In steel, non-ferrous metals, petroleum, petrochemical, chemical, chemical fiber, textile, machinery, electronics, building materials, coal, medicine, paper, injection molding, cigarettes, elevators (including escalators), driving (including port cranes), urban water supply (including sewage Processing), central air-conditioning and household appliances and other industries are widely used.

Inverters are widely used. According to the voltage level, they are divided into low-voltage inverters and medium-high voltage inverters. The purposes and requirements of applications in various industries are different.
Petroleum: oil transfer pumps, electric submersible pumps, water injection pumps, pumping units, etc.
Chemical industry: extruders, film conveyors, mixers, compressors, blowers, sprayers, pumps, etc.
Iron and steel: rolling mill, roller table, fan, pump, crane, ladle car, converter tilting, etc.
Metallurgical industry: rolling mills, roller tables, blast furnace fans, pumps, hoisting machinery, blast furnace feeding, steel mill polishing, etc.
Steel rolling line: drawing machine, coiling machine, blower, pump, hoisting machinery, cut-to-length, automatic feeding.
Construction: elevators, conveyor belts, air conditioning equipment, blowers, pumps, etc.
Electricity: Blowers for boiler drums, water feed pumps, centrifugal mixers, conveyor belts, pumping power stations, flywheels, etc.
Mining industry: mud pumps, conveyor belts, hoists, cutting machines, digging machines, cranes, blowers, pumps, compressors, etc.
Transportation: electric vehicles, electric locomotives, ship propulsion, air compressors, cable cars, etc.
Cement: rotary kiln, hoisting machinery, blower, pump, main drive motor, conveyor belt, shaft kiln fan, etc.
Paper industry: paper machines, pumps, pulverizers, fans, mixers, blowers, etc.
Electronic manufacturing: air compressors, injection molding machines, central air conditioners, fans, pumps, conveyor belts, etc.

frequency converters used

Take the coking plant as an example to illustrate what kind of occasion the frequency converter is used for:
1. The function of the boiler induced draft fan is to form a negative pressure in the flue and draw the flue gas into the chimney. This negative pressure is wasteful, but it cannot be done without. It is also related to the combustion situation of the boiler. Frequency conversion can stabilize the negative pressure.

2. Boiler feed water pump, because the boiler water level is fluctuating, so when the water level is low, increase the frequency to increase the feed water flow to prevent water shortage; when the water level is high, reduce the frequency to prevent the water level from entering the steam pipe when the water level is too high.

3. The function of the gas fan is to compress the gas produced by the coke oven into the gas cabinet and supply gas to the user. The frequency can be adjusted according to the user’s gas consumption to stabilize the pipeline pressure.

4. The running drive of the coal loading car/coke pushing car/smoke guide car/coke quenching car (collectively referred to as the four major cars), because the frequency conversion control is smoother and more stable without impact, and it is convenient to align with the furnace door (plus devices such as encoders) It can also realize automatic alignment).

5. Dust removal fan (this is a high-voltage motor), this is for energy saving and production needs. Due to the needs of the production process, dust removal is required every 20 minutes or so. The power of the fan is 560KW. If it takes 1 minute to accelerate from 0 to the required speed, it is obviously unreasonable to restart it every time dust removal is needed, and then stop it when it is used up. It cannot keep up with the needs of production, and the high-voltage motor is not allowed to be short-circuited. Time starts and stops repeatedly. The high-voltage inverter solves this problem. When there is no need for dust removal, it runs at a low speed of 15HZ. Once the dust removal command is issued, it quickly accelerates to 50HZ to meet production needs, and then continues to stand by at low speed to save energy.

6. The coal loaded into the coke oven is actually mixed coal (that is, 4 types of coal are mixed in proportion), and there are 4 feeders in the lower part of the 4 coal bunkers driven by frequency converters. With belt scales, frequency modulation can achieve precise proportioning. Stabilize product quality and improve economic benefits.

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