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Nozzle governing steam turbine single valve/sequence valve undisturbed switching steam distribution curve optimization method

A nozzle adjustment and non-disturbance switching technology, which is applied in the direction of machines/engines, mechanical equipment, engine components, etc., can solve the problems of increasing the switching workload and error probability of operating personnel, increasing the safety risk of steam turbine operation, and reducing the economical efficiency of steam turbine operation, etc. , to achieve the effect of improving operating economy, eliminating safety risks, and improving accuracy

Active Publication Date: 2020-11-13
XIAN THERMAL POWER RES INST CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the new situation where thermal power units generally have a peak-shaving range and increasing pressure on energy saving and consumption reduction, if the steam distribution mode of the high-profile valve is frequently switched during the normal operation of the unit, it will undoubtedly increase the workload of the operator and the probability of error. The normalization of work will increase the safety risk of steam turbine operation, and the untimely switching work will reduce the economical efficiency of steam turbine operation
[0010]The above-mentioned problems in the operation practice of the traditional single valve / sequence valve switching mode of the nozzle regulating steam turbine cannot be completely and effectively solved by relying on the simple manual switching method

Method used

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  • Nozzle governing steam turbine single valve/sequence valve undisturbed switching steam distribution curve optimization method
  • Nozzle governing steam turbine single valve/sequence valve undisturbed switching steam distribution curve optimization method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] reference figure 1 , figure 1 For a 600MW supercritical nozzle to adjust the steam turbine single valve / sequence valve to switch the steam distribution curve without disturbance. The steam turbine is a medium-pressure cylinder start mode. When the total valve position command of the steam turbine is 0<MR≤20%, the openings of CV2, CV3, CV4 and CV1 are all 0, and the middle regulating valve command of the steam turbine opens gradually from 0 to 100 ; When the total valve position command of the steam turbine is 20%<MR≤39.6%, the CV2, CV3, CV4, and CV1 high-profile valves are opened synchronously, and the openings are the same. At this stage, the steam turbine distribution method is a complete single valve steam distribution method; When the total valve position command 39.6%<MR<45%, the opening of CV2 and CV3 high-profile valves continue to increase, and the CV4 and CV1 high-profile valves gradually close. At this time, the steam turbine is in the single-valve steam-to-sequ...

Embodiment 2

[0030] reference figure 2 , figure 2 For a 1000MW ultra-supercritical nozzle to adjust the steam turbine single valve / sequence valve non-disturbed switching steam distribution curve. When the total valve position command of the steam turbine is 0

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Abstract

The invention discloses a nozzle governing steam turbine single valve / sequence valve undisturbed switching steam distribution curve optimization method. The method comprises the following steps that the steam distribution mode of a steam turbine belongs to single-valve steam distribution when the steam turbine operates valve location instructions MR by less than or equal to 40%; the steam distribution mode of the steam turbine is at a switching stage from a single-valve to a sequence valve when the steam turbine operates valve location instructions MR by more than 40% and less than or equal to45% or 50%; and the steam distribution mode of the steam turbine is gradually and automatically switched to sequence valve steam distribution when the steam turbine operates valve location instructions MR by more than 45% or 50%. Through the undisturbed switching method, various types of problems caused by a traditional manual switching method can be effectively solved.

Description

Technical field [0001] The invention belongs to the technical field of steam turbines, and relates to a method for optimizing a steam distribution curve of a nozzle regulating single valve / sequence valve of a steam turbine without disturbance switching. Background technique [0002] Single-valve steam distribution means that when the load of the unit changes, all high-profile valves of the steam turbine open and close at the same time, with the same opening degree, and all high-profile valves simultaneously throttle to control the steam intake of the steam turbine. Sequence valve steam distribution means that the high-profile valves of steam turbines are opened in a certain order. The openings of the high-profile valves are different. The first-open high-profile valve has a large opening, and the later-opened high-profile valve has a small opening. There are only individual high-profile valves in each load section. Throttling. [0003] When single-valve steam distribution, the hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D17/10
CPCF01D17/105
Inventor 王勇江浩居文平李杨周元祥周刚林琳井新经李耀锋宋佳佳王宏武张奔
Owner XIAN THERMAL POWER RES INST CO LTD
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