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

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...

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

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