Coal mill is an important auxiliary equipment of thermal power plant, which is mainly used to break and grind coal into pulverized coal for boiler combustion. Traditionally, the coal mill in the thermal power plant mostly adopts the mode of asynchronous motor + reducer, and the power frequency is directly started. Such schemes have shortcomings in terms of energy efficiency and environmental protection. With the improvement of energy efficiency and environmental protection requirements of the state, thermal power plants gradually need to carry out energy-saving transformation.

1.Customer demand

In the past work, due to the large starting current of the traditional asynchronous motor + reducer mill system, usually requires a high starting power, and the slow response speed of the traditional control system, customers face problems such as low energy efficiency, insufficient control accuracy, complex equipment maintenance, loud noise, and poor system adaptability.

2.FGI scheme

To meet the needs of energy saving transformation of coal mills in thermal power plants, FGI provides FD5000S series medium Voltage drive and permanent magnet synchronous motor direct drive solutions. Two FD5000S frequency converters are used in parallel.

In this working condition, the performance mainly at full load startup requires stability and reliability, and it is required to start at 2 times the rated current of the motor. The program has the following core advantages:

Energy-efficient

The direct drive of permanent magnet synchronous motor greatly improves the energy utilization efficiency, and reduces the energy consumption compared with the traditional asynchronous motor + reducer solution.

Simplify maintenance

The direct drive system eliminates the reducer and other complex mechanical transmission components, reduces the maintenance difficulty and cost, and improves the reliability of the system.

Accuracy control

FD5000S series medium Voltage drive provides excellent low frequency high torque characteristics and fast response ability, suitable for heavy load start, so that the speed and torque control in the grinding process is more accurate, to meet the production needs of different working conditions.

Low noise operation

The permanent magnet synchronous motor has low operating noise, which improves the comfort of operating environment and reduces noise pollution.

Wide range adaptability

FD5000S series medium Voltage drive has a wide voltage input (input voltage AC1140V±15%), which can adapt to the voltage fluctuations of the power grid and ensure stable operation.

3.Scheme value

Core convenience: By applying FGI's FD5000S series medium Voltage drive and permanent magnet synchronous motor direct drive solution, the coal mill system of thermal power plant significantly improves the overall energy efficiency and reduces the power consumption. Equipment stability and reliability are improved, reducing maintenance and downtime. At the same time, the optimized system operates more environmentally friendly, effectively reducing noise and emissions.

Increased capacity: Through the revamped coal mill system, efficient pulverized coal preparation is achieved, which improves the boiler combustion efficiency and thus increases the power generation of the power plant.

Energy consumption reduction: Through accurate speed regulation and optimized operation, the system energy utilization efficiency is improved, and energy consumption is significantly reduced. According to field data, power consumption is reduced by about 20% to 30% compared to traditional systems.

Cost savings: Maintenance costs are significantly reduced due to easy maintenance and reduced downtime. In addition, the operation cost of the system after the energy-saving transformation has been effectively controlled.

Management optimization: FD5000S series inverter has remote monitoring and intelligent diagnosis functions, which facilitates daily operation management and maintenance, and improves management efficiency.

The application of FGIFD5000S series inverter and permanent magnet synchronous motor direct drive scheme in coal mill of thermal power plant has proved its significant advantages in energy saving, consumption reduction, production efficiency improvement and maintenance cost reduction.

By optimizing the energy efficiency of the system, improving the reliability of the equipment and the precision control ability, the reformed coal mill not only meets the requirements of modern production for high efficiency and environmental protection, but also greatly reduces the operation noise and environmental pollution.

In the future development of FGI pain points and customer demand, will continue to further study of industry to provide more innovative solutions, in response to various complicated working condition and high standard of technical requirements. Through continuous technological innovation and service optimization, FGI will continue to contribute to energy conservation, emission reduction and efficiency improvement in various industries.