Ferrosilicon is a kind of compound, in iron and steel, casting and other industrial production, often used as deoxidizer and alloy agent is widely used, is an important link in industrial production. Ferrosilicon smelting is coke, steel chips, quartz (or silica) as raw materials, smelting with electric furnace. The refining of ferrosilicon needs to consume a lot of energy and produce a lot of dust. In order to avoid the pollution of dust to the environment and improve the energy utilization rate, high voltage frequency converter with high quality is an indispensable driving equipment in the equipment of electric furnace dust collector.
STEP continues to help ferroalloy manufacturers upgrade and transform
A ferroalloy factory in Lanzhou, Gansu Province is the backbone enterprise of ferrosilicon smelting in the local area, and has established a long-term cooperative relationship with STEP. In order to solve the contradiction of insufficient production capacity, the enterprise has upgraded the ferrosilicon electric furnace system. In line with the goal of one-step improvement and overall improvement, the improvement of dust removal effect is also included in the key consideration.
After some evaluation, the company decided to replace the fan, motor and its drive frequency converter in the dust collector. Based on the good application results of previous products, the customer did not hesitate to choose Shinsida inverter to replace the existing brand inverter. The company believes that after more than ten years of production and use and after-sales service, STEP inverter operation is more stable, lower failure rate, better service.
Now, let's take a look at the specific performance of STEP frequency converter in this transformation!
Process flow of backblow bag filter
Fesi furnace production process packaging material, sending melting slag, oxygen blowing, reduction, in addition to iron process, such as the electric furnace smelting cycle is about 90 minutes, including sending melting and about 60% oxygen stage of the process time, at this time of high temperature flue gas dust after cooling water filter, air into the bag filter to purify the back into the atmosphere, In the whole dust removal process, the reverse hair dryer and dust removal fan are high energy consumption equipment. Frequency converter is used to adjust the operation frequency according to the requirements of the production process, so as to realize the efficient utilization of energy.
Frequency converter system configuration
In the dust removal system upgraded in this project, the STEP AS450 series vector low-voltage frequency converter is used for the backblow dryer, and the converter's adaptive power is 280kW, while the AS800 series 1250kW high-voltage frequency converter is used for the dust removal fan. Previously, four STEP AS800 series high voltage frequency converters have been successfully applied in the manufacturer's previous transformation.
↑High voltage inverter for dust removal is in operation
STEP AS800 high voltage inverter drive advantage:
· Power factor above 0.95, no harmonic interference to the power grid
· The whole machine has high efficiency, the full load operation efficiency is up to 96%, and the energy utilization rate is improved
· The drive of frequency converter can adjust speed freely according to technological requirements, and refuse to waste energy
· Equipped with the start function of the flying car, to meet the requirements of the fan and water pump load without stopping to realize the smooth restart
· Frequency conversion without disturbance synchronous switching function, realizing power frequency start-up of high-power fan and pump loads
· Power off endurance and power off restart functions to ensure normal operation of the equipment in the case of instantaneous power failure of the power grid
· Support unit bypass function, automatically bypass operation when a single unit fails to ensure the continuity of equipment operation
· Customized VF curve function to meet the load startup requirements of all types of fans
· Multiple control modes are free to choose, including panel, terminal and various communication controls
· With a variety of power frequency bypass systems, power frequency switching can be realized according to customer process requirements
· Perfect fault self-diagnosis display function, support virtual oscilloscope and event record display
· Frequency conversion speed regulation pressure closed-loop built-in pid process closed-loop control, pressure stabilization control, avoid valve adjustment
· Frequency conversion speed regulation can realize soft start of the system, reduce startup impact, and extend the service life of the equipment
· Support permanent magnet synchronous/other excited synchronous motor drive, no need to change the hardware configuration
· High-voltage group control system, supporting remote centralized monitoring/control