A ferroalloy factory in Lanzhou, Gansu Province is the backbone enterprise of local ferrosilicon smelting, and has established a long-term cooperative relationship with Xinshida. In order to solve the contradiction of lack of production capacity, the company has upgraded the ferrosilicon electric furnace system, and the improvement of dust removal effect has also been included in the key considerations in line with the goal of one-step and overall improvement.
After some evaluation, the company decided to replace the fan, motor and drive inverter in the dust collector. Based on the outstanding application results of past products, the customer did not hesitate to choose the new Shida inverter to replace the existing brand inverter. The company believes that after more than 10 years of production and after-sales service, the new Shida inverter operates more stably, has a lower fault rate and better service.
The process flow of back-blowing bag dust collector
The whole electric furnace smelting cycle is about 90 minutes, during which the electric melting and oxygen blowing stage accounts for about 60% of the whole process time, and the high-temperature dust flue gas generated at this moment is cooled by the water-cooled dust collector, and then enters the reverse blowing bag dust collector and is discharged into the atmosphere.
Inverter system configuration
In the dust removal system promoted in this project, the reverse blower uses the AS450 series vector low-voltage inverter with an adaptive power of 280kW, and the dust removal fan uses the AS800 series 1250kW high-voltage inverter. Previously, four new AS800 series high-voltage inverters have been successfully used in the manufacturer's previous transformations.
Advantages of the AS800 high-voltage inverter drive
The power factor is above 0.95, and there is no harmonic interference to the power grid
The power of the whole machine is high, and the full-load operation power is as high as more than 96%, which improves the energy utilization rate
The inverter drive can be freely adjusted according to the process requirements, and the waste of electric energy is rejected
It has the function of speeding car to meet the load of fan and water pump to complete the smooth re-start without stopping
Frequency conversion and non-disturbance synchronous switching function to complete the power frequency launch of high-power fan and pump loads
Power-off endurance and power-off re-start function, to ensure the normal operation of the equipment in the case of instantaneous power failure of the power grid
Support the bypass function of the unit, and automatically bypass the operation when a single unit fails, so as to ensure the continuity of the operation of the equipment
Customize the VF curve function to meet the requirements of various wind turbine load starters
A variety of control methods can be freely selected, panels, terminals, and various communication controls
It has a variety of power frequency bypass systems, and can complete the industrial frequency switching according to customer process requirements
Perfect fault self-diagnosis display function, supporting virtual oscilloscope and event record display
Frequency conversion speed regulation pressure closed-loop built-in PID process closed-loop control, pressure stabilization control, to prevent valve conditioning
Frequency conversion speed regulation completes the soft start of the system, reduces the impact of starting, and prolongs the service life of the equipment
Support permanent magnet synchronous/separately excited synchronous motor drive without replacing hardware configuration
High-voltage group control system supports remote centralized monitoring/control
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