Double-fed system-based electric induced draft fan system of direct air cooling unit

Abstract

The invention discloses a double-fed system-based electric induced draft fan system of a direct air cooling unit. The electric induced draft fan system comprises an induced draft fan, a double-fed motor, an air cooling island and the like. An electric induced draft fan is changed into a steam-electricity double-drive mode, and the induced draft fan is additionally arranged to drive a small steam turbine and a condensing device; and a motor is changed into the double-fed motor. On the premise that the working power consumption of the induced draft fan is met, the double-fed motor is automatically converted into a generator state, the residual power of the small steam turbine is converted into electric energy and merged into an auxiliary power system, the power supply capacity of the unit is improved, and the electric energy generated by the double-fed motor is 50Hz and can be directly connected to the internet; and when the small steam turbine breaks down and the double-fed motor operates as a motor, the rotating speed of the induced draft fan can be directly adjusted, so that the operation condition of the induced draft fan is adjusted. Through implementation of the double-fed system-based electric induced draft fan system of the direct air cooling unit, all operation requirements of the induced draft fan can be met, the station service power consumption rate is reduced, the adjusting efficiency and the adjusting safety of the induced draft fan in a future high-frequency sub-wide load application scene are improved, and huge energy-saving potential is achieved.

Description

technical field [0001] The invention belongs to the field of power plant boiler and steam turbine systems, and in particular relates to an electric induced draft fan system of a direct air cooling unit based on a double-fed system. Background technique [0002] In recent years, my country's wind power, photovoltaic, hydropower and other new energy power installed capacity has continued to grow rapidly, and the installed capacity both in service and under construction has ranked first in the world. New energy sources such as wind power and photovoltaics have provided us with a large amount of clean electricity, but on the other hand, the randomness and instability of their power generation output have also brought great challenges to the safe operation of the power system and the guarantee of power supply. Judging from the current situation, the regulation capacity of my country's power system is difficult to fully meet the requirements of large-scale development and consumpt...

AI Technical Summary

Problems solved by technology

Judging from the current situation, the adjustment capacity of my country's power system is difficult to fully meet the requirements of large-scale development and consumption of new energy, and serious problems of abandoning wind, solar and water have emerged in some areas.

In order to tap the peak-shaving potential of thermal power units, improve the flexibility of thermal power operation in my country, and improve the capacity of new energy consumption, thermal power units need to operate under wide-load and high-frequency load changes. The main auxiliary equipment of the power plant, such as water pumps, fans, etc. The power consumption rate has been greatly increased. According to the field test data, when the unit peaks to 30% of the load, the power consumption rate of the plant increases to about 10%, and the power supply efficiency drops significantly.

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