Projects in Fujian and Anhui

Projects of Frequency Conversion Driving for 2×7700kW Desulfurization and Denitrification Booster Fan (Axial Flow Fan with Adjustable Blades) of Fujian Longking and Anhui Weida 

The desulfurization and denitrification project of 2×260㎡ sintering machine flue gas of Jingye Steels, which was constructed by Fujian Longking Environmental Protection Engineering Technology Co., Ltd. and Anhui Weida Environmental Protection Technology Co., Ltd., started construction in September 2019. The project was contracted by Fujian Longking and Anhui Weida for one desulfurization and denitrification production line each. The asynchronous motor of 10kV, 7700kW motor special for converter, manufactured by Shangdian, has been chosen, and the axial flow fan with adjustable blades produced by Howden has been used as the induced fan. The efficiency of this type fan is much higher than that of the traditional centrifugal fan, and the performance requirements for converter of this type of fan is also higher than for the conventional converter.

Schorch Electric has provided 2 water-cooled MV converters for the projects, one for each company. The converter capacity is 10000kVA, with functions of power unit bypass, flying start-up, and start-up with industrial frequency. The converter can be used as solid-state soft start according to the customer's working conditions, with small starting current and no impact when connected to the grid to realize the starting of high-power motors; At the same time, it can also be used for frequency conversion drive operation, according to the size of the process load, to adjust the conversion frequency in real time, so as to achieve the goal of energy saving and consumption reduction under the premise of meeting the production process. The two converters can be controlled by logic to realize one converter for two motors, and they are standby devices of start-up for each other (optional). By July 6, 2020 this project has passed the trial run and the converter has been commissioned to the best condition. On-site practical training has been provided for site operation and maintenance personnel, and it will be officially delivered for use in normal production.