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the Domestic Maximum-capacity Main Exhauster (Exhaust Fan) of Sintering

Date: 2012-12-13
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The Variable Frequency Speed Control System for the Domestic Maximum-capacity Main Exhauster (Exhaust Fan) of Sintering Was Successfully Put into Operation and Accepted


On November 19, 2012, Zhiguang's variable frequency speed control system with proprietary intellectual property rights for domestic maximum-capacity main exhausts (exhaust fans) in sintering lines was accepted and put into operation in the 430 m2 new sintering line of a large iron and steel production base of Baosteel Group. The successful and stable operation of this project indicates that Zhiguang is quite skilled at the application of such ultra-large capacity HV frequency converter technology. In addition to frequency converters of the main exhausts (exhaust fans) for sintering, it is able to offer specific solutions for the application of the speed control systems for such equipment.
Such speed control system consists of five sub-systems: i) the power supply system of main exhausts (exhaust fans); ii) the centralized monitoring system of main exhausts (exhaust fans); iii) HV frequency converters designed for ultra-large capacity synchronous motors; iv) the cooling system of the HV frequency converter chamber; and v) excitation system for frequency conversion and speed control of brushless excitation synchronous motors.
 In this project, two 10,000 kVA ZINVERT frequency converters for ultra-large capacity synchronous motors, as well as the special control technology of such motors, are applied to achieve their accurate control. With the accurate speed detection and control technology, such ZINVERT frequency converters for synchronous motors can achieve the "Flying car start" effect of these motors within their full frequency range. As a domestic cutting-edge technology, it can meet the needs of motors for efficient operation for a long period and realize the switching of HV motor modes between undisturbed variable frequency operation and power frequency operation.
The Variable Frequency Speed Control System for the Domestic Maximum-capacity Main Exhauster (Exhaust Fan) of Sintering Was Successfully Put into Operation and Accepted 
Such ZINVERT frequency converters for ultra-large capacity synchronous motors apply the Level 10 series power unit technology with large design redundant capacities. Under the primary unit bypass state, the full-load variable frequency operation is still possible, or the switching between undisturbed loaded mode and power frequency operation is completed. Meanwhile, the excitation system for frequency conversion and speed control of brushless excitation synchronous motors is used with two controllers for the standby application (i.e. switching to standby units in case of main unit failure) to ensure reliable operation of such excitation system. Furthermore, such system is complete with multiple control modes, such as constant trigger angles, voltage, current and power factors. Featuring easy and reliable operation, it can automatically switch to an appropriate control mode according to the motor operation state.
Zhiguang Electric is a leader in R&D and applications of domestic ultra-large capacity HV frequency converter technologies. Such products developed by it have been stably operating in feed pumps of 300 MW units, combined induced draught fans, blast furnace blowers, and main exhausts (for sintering) of 600 MW units, as well as other similar applications of ultra-large capacity motors, leading to excellent operation effects. It will continuously increase its R&D and applications on such frequency converters to constantly stand out from its competitors in fierce competitions.

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