In iron and steel enterprises, it is known for its dense resources, dense energy consumption, large production scale and large logistics throughput. In the second phase of the sintering machine project of Ninggang Group, the main exhaust fan of the sintering machine has a large power, which is a 10kV/8400kw electrically excited synchronous motor. If the inlet baffle conditioning method is selected for air volume conditioning, it only changes the flow resistance of the channel, the output power of the drive source does not change, the throttling loss is appropriately large, and the power waste is large.
The frequency conversion speed regulation system has been recognized by the majority of users and the market for its remarkable energy-saving benefits, high speed regulation accuracy, wide range, perfect protection function, and easy to realize automatic control. In terms of safety and reliability of operation, convenience of installation and application, simplicity of repair and protection, etc., it also brings great advantages to the user, making it the first choice for energy-saving methods of enterprise motors.
The main exhaust fan is one of the main supporting equipment of the sintering machine, which directly affects the output, quality and energy consumption of the sintering machine, and is the "heart" of sintering production. Together, various gases generated in the sintering process are passed through the flue, and the electrostatic precipitator is purified and discharged from the chimney. Environmental protection requirements: desulfurization recovery equipment needs to be installed between the exhaust fan and the chimney.
Introduction to the high-pressure frequency conversion system plan of the main exhaust fan:
(1) The sintered main exhaust fan, the drive motor is a 10kV/8400kw electric excitation synchronous motor, the main circuit of the frequency conversion system is selected as a drag and a drag plan, and the frequency converter model is GD5000-A11200-10. The excitation current of the motor is output by the excitation cabinet, and the control interlocking between the excitation cabinet and the inverter is carried out.
(2) The system has two control methods: local and remote.
When operating on the spot, start and stop the fan on the on-site operation box, and adjust the frequency through the knob;
When operating remotely, the DCS system in the central control room operates the start and stop fan and adjusts the frequency. Adjust the frequency to change the speed of the motor to achieve the intention of adjusting the air volume.
(3) By setting the lower limit frequency of 30Hz and setting the faster acceleration time, the smooth requirements of the fan machinery can be met: the fan can quickly reach 30Hz after starting, and the smooth oil film will be formed on the machinery to ensure the normal smooth system.
(4) Before operating the inverter, it is necessary to confirm that the air-water cooling system of the inverter is normally open, which is a necessary condition for the inverter to start. If the air-water cooling system is not open, the central control DCS system will have an alarm indication.
(5) Inverter heat dissipation plan: introduction of air and water cooling system
The main principle of the air-water cooling system is to exchange the hot air of the inverter through the air-water cooling equipment, and the cooling water directly takes away the heat of the hot air, and the cooling cold air is discharged back to the room. The temperature of the cold water in the air water cooling equipment is lower than 32 °C, which can ensure that the ambient temperature in the inverter room is controlled below 40 °C after the hot air passes through the heat sink, which meets the requirements of the equipment for environmental operation. The cooling water is completely separated from the circulating air, and the water pipeline is clearly separated from the high-voltage equipment outside the frequency conversion room, so as to ensure that the high-voltage equipment room will not be threatened by safety threats and accidents such as waterproofing and insulation damage.
User benefits
1. High product reliability and good user experience:
Since the inverter of the main exhaust fan has been put into operation, the operation has always been stable and reliable, and the excellent function and product reliability of the inverter have been highly recognized by users. INVT will continue to do its best to improve itself and bring users a better experience.
2. Efficient and environmentally friendly heat dissipation plan - air water cooling:
The air-water cooling system is an efficient, environmentally friendly and energy-saving cooling system. Compared with the traditional air duct cooling plan, the air-water cooling plan has the advantages of low dust content, small protection amount, and extended service life of the inverter. However, its operating cost is about 1/4 of the equal heat exchange power air conditioning plan. Therefore, the air-to-water cooling plan has also become the first choice for the heat dissipation plan of high-power inverters in steel, electric power, chemical and other occupations.
3. The power saving rate is more than 30%, and the benefits are significant:
As a "big consumer" of steel mills, the main exhaust fan operates at a frequency of about 35Hz at the initial stage and about 46Hz during maximum load production. Compared with the power frequency method, the air volume is adjusted by the damper baffle, and the main exhaust fan is controlled by frequency conversion speed regulation, with an average power saving rate of more than 30%, and the energy saving benefit is significant.
5. Concluding remarks
GD5000 series high-voltage inverter has been used successfully in sintered main exhaust fans, and the excellent functions and product reliability of the inverter have been recognized by users. It provides experience for enterprises to choose domestic high-voltage inverters on high-power motors in the future, and also proves that the high-voltage inverters of Shenzhen INVT Electric Co., Ltd. have advanced technology, excellent functions and stable products, which can completely meet the needs of the site.
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