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Keywords: micro-energy high-voltage frequency converter, dust removal fan, energy-saving reform
introduction
In 2006, China’s steel production continued to rank first in the world. However, high energy consumption in the iron and steel industry coexists. According to relevant data, China’s steel industry’s share of the total energy consumption in the country is as high as nearly 15%, together with the electricity and chemical industries. It ranks the top three in terms of industrial energy consumption, which is undoubtedly the pain for the high-speed development of the Chinese steel industry. Obviously, the elimination of high-energy-consuming backward technology equipment, through a series of advanced energy-saving measures for energy-saving transformation, and the use of advanced energy management measures are undoubtedly the top priority for the steel industry.
Overview
Guangyao Iron & Steel Co., Ltd. is a modern enterprise specializing in pig iron smelting and foundry; mineral powder sintering; iron fine powder washing and so on. Due to the need for rapid development of the company, the company newly joined a steel-making project. In order to increase product competitiveness and reduce energy consumption, the company introduced the latest high-voltage frequency conversion energy-saving technology to blast furnace dust blower drives in steel mills. The inspection and detailed analysis of the engineering and technical personnel of the company limited company selected the WIN-HV series high-voltage frequency converter manufactured by Shenzhen Weineng Technology Co., Ltd.
We know that each blast furnace has a steel port and a tap hole. When the blast furnace is used for steel or tapping, high temperature molten steel reacts violently with air and generates a lot of smoke. On the one hand, it is unfavorable to workers who operate on site, and on the other it also causes great pollution to the environment. In order to improve the on-site environment and reduce pollution, it is necessary to carry out dust removal and transformation of the steel furnace against steel and tapping. The approximate process of Guangyao Blast Furnace is about 100 minutes for a barrel of steel, roughly divided into feeding, blowing, and discharging. The approximate time is 20 minutes, 60 minutes, and 20 minutes, respectively. It is controlled automatically by an oxygen gun. Manually controlled by the position of the lance.
According to the process requirements, the dust blower needs two kinds of air volume to adapt to the steelmaking process requirements of the blast furnace. To this end, the dust blower is divided into two stages of speed control - high speed and low speed, low speed of feeding and discharging, blowing is high speed, and The system requires that the accelerating time of the high-voltage frequency converter must be short enough, and a long accelerating time will affect the efficiency and the dust removal effect. Therefore, the time from low speed to high speed must be controlled within 40 seconds so as not to affect the dust removal effect.
Design
According to the situation on the site and the various conditions available, it was decided to adopt the following reconstruction scheme 1. Simplify the control logic. The on-site direct control of the speed of the inverter is based on the switching status of tapping and steeling ports. The inverter presets 2 speed points. Depending on the amount of wind required on site, the motor speed is automatically adjusted. Using the programmable high-level functions of PLC built into the micro-energy high-voltage inverter, the time and speed are given on the Chinese man-machine interface of the inverter:
3, after the application of the effect
Extend the life of the motor and fan. The dedusting fans are all centrifugal fans. The starting time is long and the starting current is large (about 6 to 8 times the rated current). The mechanical impact on the motor and the fan is great, which seriously affects its service life. The adoption of variable frequency speed regulation can realize soft start and soft braking, with almost no impact on the motor, which can greatly extend the service life of the machine.
Micropower enters the metallurgical steel industry leading domestic energy conservation trends
Abstract: This article focuses on the application of micro-energy high-voltage frequency converters in Guangyao Iron and Steel Co., Ltd. It is proved by the on-site operation of high-voltage inverters that the dust removal fan of the iron and steel industry adopts micro-energy high-voltage frequency converters for energy saving is successful, and energy conservation is significant.