A On-Site Diagnosis Method for Low Pressure of Safety Oil in Emergency Shutoff

Abstract

The invention discloses a spot diagnosis method for emergently interdicting low safety oil pressure. The method comprises the following steps: AST safety oil pressure and the establishing mechanism of OPC oil pressure are analyzed on the basis of the schematic diagram and the design instruction of a regulation security system to provide a basis for module division before fault diagnosis; mechanism division modules are established on the basis of the AST oil pressure and the OPC oil pressure; the numerical values of the AST oil pressure and the OPC oil pressure are recorded by a turbine latch to diagnose relative modules in sequence. According to the invention, the fault of emergently interdicting low safety oil can be diagnosed rapidly, accurately and efficiently on the spot, so that not only is the downtime of units shortened, but also various factors influencing faults can be comprehensively checked without leaving hidden danger, therefore, obvious safety benefit and economic benefit are brought to power plants.

Description

technical field [0001] The invention relates to the technical field of on-site diagnosis of faults in steam turbine regulation and security systems, in particular to a method for on-site diagnosis of low oil pressure for emergency cut-off safety oil. Background technique [0002] The regulating security system and its anti-fuel oil (also known as EH oil) system of a steam turbine in a power plant are very large, including EH oil station, valve oil motor actuator, mechanical overspeed and manual blocking device, overspeed limit and emergency blocking device, online blocking Test equipment, etc., the structure and working principle of the system components and the interrelationships between the components are very complicated, resulting in a very high probability of failure of the adjustment security system, and it is relatively difficult to troubleshoot and deal with on-site failures; once a failure occurs, often A shutdown is required for processing, which can cause signific...

AI Technical Summary

Problems solved by technology

[0002] The regulating security system and its anti-fuel oil (also known as EH oil) system of a steam turbine in a power plant are very large, including EH gas station, valve oil motor actuator, mechanical overspeed and manual blocking device, overspeed limit and emergency blocking device, online blocking Test equipment, etc., the structure and working principle of the system components and the interrelationship between the components are very complicated, resulting in a very high probability of failure of the adjustment and security system, and it is relatively difficult to troubleshoot and deal with on-site failures; once a failure occurs, often Requires downtime for processing, which can cause significant economic losses to the power plant

No matter during the commissioning of the new unit or the operation of the old unit, the adjustment and security system often has a fault of low blocking safety oil pressure. Before that, there was no set of on-site practical and relatively mature fault diagnosis methods for low blocking safety oil pressure, mainly relying on personal technology Experience adopts exploration and trial solutions, which are highly subjective and arbitrary. Various factors that cause low safety oil pressure cannot be thoroughly investigated, which makes the troubleshooting time very long and seriously affects the economic benefits of the power plant. , leaving a safety hazard for the operation of the unit

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