Method for preventing pump effect lifting of axial flow turbine by using guide vane closing rule

A guide vane closing rule, a technology for water turbines, applied in the direction of reaction engines, machines/engines, mechanical equipment, etc., can solve problems such as accidents, and achieve the effect of preventing pumping from lifting the machine

Active Publication Date: 2020-06-30
WUHAN UNIV
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Problems solved by technology

Due to the structure and layout characteristics of the axial flow turbine, during the load shedding transition process, due to the fast closing of the guide vane (3), the lifting force will be greater than that of the rotating parts of the unit (the rotating parts of the unit mainly include the turbine, main shaft, generator rotor and Other accessories) gravity events, that is, lifting the machine, serious cases will lead to accidents

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  • Method for preventing pump effect lifting of axial flow turbine by using guide vane closing rule
  • Method for preventing pump effect lifting of axial flow turbine by using guide vane closing rule
  • Method for preventing pump effect lifting of axial flow turbine by using guide vane closing rule

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] A method for preventing axial-flow turbine pump effect lift-up by using the guide vane closing rule. The entire closing process of the guide vane from the initial closing to the complete closing when the axial-flow turbine is shedding load is divided into three time periods. The opening of the middle section keeps decreasing, that is, the guide vane has a pause during the whole closing process, and the working point of the turbine is in the braking zone under the opening of the guide vane during the stop. During the pause period, the braking effect will be used to While the speed is reduced, a certain flow range is maintained, so as to avoid the occurrence of high speed and low flow at the same time, and prevent the pump effect from lifting the machine. This method does not require additional investment, and only needs to modify the governor of t...

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Abstract

The invention discloses a method for preventing pump effect lifting of an axial flow turbine by using a guide vane closing rule. The whole closing process of a guide vane is divided into three periodsfrom start closing to complete closing during load shedding of the axial flow turbine, wherein the opening degrees of the first period and the end period continue to decrease, the opening degree of the middle period is unchanged, namely the guide vane is paused for a short time in the entire closing process, when the turbine is stopped at the working point, the opening degree of the guide vane isin a braking area, in the pause period, the braking effect is utilized to reduce the rotating speed while a certain flow range is maintained, co-occurrence of high rotating speed and low flow is avoided, and the pump effect lifting is prevented. The method avoids the simultaneous occurrence of high rotating speed and low flow, and the pump effect lifting can be prevented only by modifying the parameters of a governor.

Description

technical field [0001] The invention belongs to the technical field of hydroelectric power generation, and in particular relates to a method for preventing pump-effect lifting of an axial-flow water turbine by utilizing the closing law of guide vanes. Background technique [0002] Hydropower is a clean renewable energy power generation, and it is currently the power generation method with the largest proportion, the highest efficiency, and the best power quality in renewable energy power generation. Hydropower undertakes the tasks of frequency regulation and peak regulation in the power grid, and is an important part of ensuring the stable and efficient operation of the power grid. [0003] Due to the reduction of end-user electricity load (such as large-scale electrical equipment failure or large-area area line failure), the power generation of the generator exceeds the amount delivered to the user. At this time, the power plant is required to reduce the power generation to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B15/18F03B15/10F03B3/18
CPCF03B3/183F03B15/10F03B15/18F05B2260/84Y02E10/20
Inventor 程永光刘珂杨志炎杨峰祝云宪
Owner WUHAN UNIV
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