I. Project Background
Converter steelmaking is the main steelmaking process in my country's steel enterprises. During the blowing process, the converter discharges a large amount of reddish-brown flue gas from the furnace mouth. This flue gas is hot, contains flammable gases and metal particles, and causes serious pollution to the atmosphere and workshop environment. Therefore, the dust collector fan is the power center of the dust removal and purification system. If the dust collector fan fails to operate normally, it will not only affect production and cause huge economic losses, but may also threaten the personal safety of on-site production personnel.
II. Project Challenges
Dust removal in converters is a crucial step in converter steelmaking. The transmission equipment is the lifeblood of the dust removal fan system, so its stability plays a vital role in the normal operation of the blower. The high-pressure speed control system配套 with the dust removal fan requires extremely high reliability and must meet the following criteria:
1. Long-term operation without failure.
2. The frequency converter has a bypass function, which can switch the motor to run in case of a fault, ensuring that the equipment does not stop.
3. Wide speed range and high efficiency.
4. It has a resonance point jump setting, which can make the motor avoid running at the resonance point and prevent the fan from surging.
III. INVT Inverter System Solutions
To meet the four key requirements of dust collector fans and safeguard the heart of dust collection equipment, INVT has launched the GD5000 frequency converter + GD5000-MS four-to-three manual bypass system solution. This solution offers the following key advantages: 1. Each frequency converter can select to drive one of three motors, providing greater flexibility. 2. When one frequency converter fails, the designated non-faulty and not running frequency converter continues to start that motor, keeping the fan operating in variable frequency mode, thus saving energy and reducing consumption.
IV. The Value that INVT Solutions Bring to Customers
1. High Reliability: Real-time monitoring of power unit operation, timely fault prediction, and guaranteed reliable equipment operation. In continuous 24-hour operation mode, the system can continue to operate even with an 8% derating after one unit is bypassed.
2. High efficiency and energy saving: The efficiency reaches up to 96% at a load of 20% or more, and the equipment operates at a frequency of about 35Hz~45Hz, saving 25% to 40% of energy.
3. Reduce maintenance costs: Reduce mechanical impact on motor and fan bearings and fan blades, thereby reducing maintenance costs and extending service life.
V. Summary
Through field application, it was found that four frequency converters drive three motors in a three-in-one standby operation, with the frequency converters serving as backups for each other, thus completely solving the problem of production stoppages caused by malfunctions.
INVT has been deeply involved in the steel industry for over a decade, dedicated to creating comprehensive electrical drive solutions for the entire steel production process. It offers a wide range of specialized steel industry products, including high, medium, and low voltage frequency converters, as well as SVG, UPS, servo drives, PLCs, and photovoltaic energy storage systems. These products are widely used in steel production process equipment. INVT has served over 300 industry users both domestically and internationally, maintaining strong partnerships with major EPC contractors, system integrators, and OEMs. INVT is committed to implementing an import substitution strategy, continuously leading the localization efforts across various industries, and contributing to cost reduction, efficiency improvement, quality enhancement, and innovation in the industry.
