Ultra-supercritical double reheat unit feedwater pump steam-electricity mixing driving device and method

Abstract

The invention relates to an ultra-supercritical double reheat unit feedwater pump steam-electricity mixing driving device and method. The device comprises a feedwater pump small steam turbine, a steam-electricity mixing driving speed-regulation device, a feedwater pump and a steam-electricity mixing driving servo motor with a frequency conversion function, wherein an input shaft of the steam-electricity mixing driving speed-regulation device is connected with an output shaft of the feedwater pump small steam turbine, an output shaft of the steam-electricity mixing driving speed-regulation device is connected with an input shaft of the feedwater pump, and a planetary gear carrier of the steam-electricity mixing driving speed-regulation device is connected with an output shaft of the steam-electricity mixing driving servo motor. Compared with a traditional pure mechanical gear and a hydraulic coupler, the ultra-supercritical double reheat unit feedwater pump steam-electricity mixing driving device has the advantages that the transmission efficiency can be improved by about 2%, and meanwhile, the steam admission throttling loss of the small steam turbine is saved by about 20%.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a steam-electric hybrid drive device and method for an ultra-supercritical secondary reheat unit feed water pump. Background technique [0002] As energy conservation and emission reduction put forward higher requirements for coal-fired power units, the industry has conducted innovative research on the thermal system of high-parameter ultra-supercritical units, especially double-reheat units. [0003] For high-parameter ultra-supercritical units, the feedwater pump is generally driven by a small steam turbine to save power consumption and ensure the cycle power supply efficiency of the entire unit. [0004] In order to pursue higher efficiency, the adjustment method of the small steam turbine of the feed water pump is particularly important. If the conventional throttling adjustment is adopted, the efficiency of the small steam turbine will be diffic...

AI Technical Summary

Problems solved by technology

If the conventional throttling adjustment is adopted, the efficiency of the small steam turbine will be difficult to guarantee

[0005] For the speed regulation of the feed water pump, it is difficult to meet the higher requirements of the pure mechanical method such as the hydraulic coupling, and it is necessary to study a more efficient direct speed regulation method

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