A Modular Diagnosis Method for Steam Turbine Control Valves Unable to Open Normally

Abstract

The invention discloses a modularized diagnostic method conducted when a control valve of a turbine cannot be normally opened. A regulation and protection system of the turbine is segmented into multiple modules which are convenient to isolate and are relatively independent from macroscopic to microcosmic according to the actual requirement of fault diagnosis; each module is segmented into small systems at the same time, wherein the small systems can conduct independent checking and remove faults; fault checking is conducted on all the small systems in sequence; and all the functional modules are isolated and released in order so that the fault point making the control valve of the turbine not capable of being opened can be positioned. By means of the modularized diagnostic method, the fault that the control valve of the turbine cannot be normally opened can be rapidly, accurately and efficiently diagnosed on site, the unit downtime is shortened, various factors influencing the faults can be comprehensively checked, no hidden dangers are left, and obvious safety benefits and economic benefits are brought to power plants.

Description

technical field [0001] The invention relates to a modular diagnosis method for a steam turbine valve that cannot be opened normally. Background technique [0002] The regulation and security system of the steam turbine in the power plant is very large, including EH oil station, several main steam valves and regulating valves, valve oil motor actuator, mechanical overspeed and manual blocking device, overspeed limit and critical blocking device, online blocking test device etc. The structure and working principle of the components of the system and the interrelationship between the components are very complicated, resulting in a very high probability of failure of the regulation and security system, and often the situation that the steam turbine regulation door cannot be opened normally, delaying the time for the unit to be connected to the grid for power generation , causing significant economic losses to the power plant. [0003] No matter during the commissioning of the n...

AI Technical Summary

Problems solved by technology

[0002] The regulation and security system of the steam turbine in the power plant is very large, including EH oil station, several main steam valves and regulating valves, valve oil motor actuator, mechanical overspeed and manual blocking device, overspeed limit and critical blocking device, online blocking test device etc. The structure and working principle of the components of the system and the interrelationship between the components are very complicated, resulting in a very high probability of failure of the regulation and security system, and often the situation that the steam turbine regulation door cannot be opened normally, delaying the time for the unit to be connected to the grid for power generation , causing significant economic losses to the power plant

[0003] No matter during the commissioning of the new unit or during the operation of the old unit, the turbine control door has experienced failures that cannot be opened normally. Before this, there was no practical and mature diagnosis method for troubleshooting this fault, which mainly relied on personal technical experience. , tentative solutions are highly subjective and arbitrary, and the various factors that cause the failure of the steam turbine valve cannot be completely resolved, prolonging the time for troubleshooting, seriously affecting the economic benefits of the power plant, and leaving a lot of trouble for the operation of the unit. Security risks