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Verification mode improvement method for low-point drainage executing mechanism on steam turbine side of thermal power plant

A technology for actuators and thermal power plants, applied in the testing of machines/structural components, testing of mechanical components, testing of mechanical valves, etc., can solve problems such as inability to determine the cause of valve failures on site, to ensure safety and accuracy, and avoid The effect of misuse

Active Publication Date: 2021-07-13
HUANENG SHANGHAI SHIDONGKOU SECOND POWER PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the maintenance period, the original logic command requires the valve to be opened when the machine is shut down, and the valve will also be opened when the water level switch contact is turned on and the liquid level is high, which makes it impossible to judge the cause of the on-site valve failure during the shutdown of the unit.

Method used

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  • Verification mode improvement method for low-point drainage executing mechanism on steam turbine side of thermal power plant
  • Verification mode improvement method for low-point drainage executing mechanism on steam turbine side of thermal power plant
  • Verification mode improvement method for low-point drainage executing mechanism on steam turbine side of thermal power plant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] refer to figure 1 , which is the first embodiment of the present invention, this embodiment provides a method for improving the verification mode of the steam turbine side low-point drain actuator in a thermal power plant, including:

[0028] S1: According to the actual situation of the valves on site, select the valves for logic modification, and check and group the selected valves.

[0029] The actual situation of the valve on site includes the use of the valve, the life of the valve and whether the valve is controlled by the solenoid valve command and so on.

[0030] Select the valve according to the above situation, and then modify the logic of the selected valve. The specific steps are as follows:

[0031] (1) The unit trip signal, the valve water level switch action signal and the manual setting switch module 100 are compared, and the state of the manual setting switch module 100 is set to 1 when it is working;

[0032] (2) OR the valve automatic closing signal ...

Embodiment 2

[0045] In order to verify and explain the technical effect adopted in this method, this embodiment chooses the traditional technical scheme and adopts this method to conduct a comparative test, and compares the test results by means of scientific demonstration to verify the real effect of this method.

[0046] The traditional technical solution cannot use coercive means for a certain logic block, and it is impossible to make a good judgment on the cause of the on-site valve failure during the shutdown of the unit.

[0047] In order to verify that this method can realize the manual forced valve opening or closing operation within the logic compared with the traditional technical solution, and can also perform the verification item of the two-position valve during the maintenance or mediation of the unit, which has higher security; in this embodiment The traditional technical scheme and this method will be used to compare the real-time judgment of the valve action.

[0048] The ...

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Abstract

The invention discloses a verification mode improvement method for a low-point drainage execution mechanism on the steam turbine side of a thermal power plant. The method comprises the steps: selecting valves for logic modification according to actual conditions of on-site valves, and carrying out the inspection and grouping of the selected valves; performing AND or OR operation on a manual setting switch module and automatic opening signals or automatic closing signals of the valves, and obtaining a remote control instruction for the valves; conducting remote opening or closing operation on the valves through the remote control instruction; according to the method, a forced logic block of a low-point drainage two-position control valve is added, a verification item of a two-position control valve can be executed during the maintenance or adjustment stop period of the unit, equipment can be ensured to find defects in time, and compared with the forced function of ovation, the method has the advantages that the safety and accuracy of operation are ensured, and the possibility of misoperation is avoided.

Description

technical field [0001] The invention relates to the technical field, in particular to a method for improving a verification mode of a steam turbine side low-point drain actuator in a thermal power plant. Background technique [0002] At present, thermal power units are still in the main position in the domestic power grid structure, so the low-point drain valve commonly used on the turbine side of our first-phase unit factory still plays a very important role. These actuators generally have two-position adjustable doors. During normal operation, they are subject to the operation of the turbine and other related conditions, and they switch on and off according to different requirements. However, during the maintenance process, such conditions are not met, and there are about 30 units with two-position adjustment doors. These two-position adjustment doors need to be verified for each maintenance, and the logic used in the first phase of our factory is ABB compose 5.0, and it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/003
CPCG01M13/00
Inventor 孙天逸俞静蔡敏管佳年
Owner HUANENG SHANGHAI SHIDONGKOU SECOND POWER PLANT