Treatment system for oxide skin of main valve rod and valve disc of thermal power plant and treatment method

A technology for thermal power generation and processing methods, which is applied in pipeline systems, metal material coating processes, gas/liquid distribution and storage, etc. , Reduce the risk of mechanical damage, the effect of simple operation

Pending Publication Date: 2021-06-22
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The assembly accuracy of steam turbine valves is relatively high. If the grinding operation causes damage to the substrate, it will affect the assembly accuracy of the valve and affect the service life of the valve.

Method used

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  • Treatment system for oxide skin of main valve rod and valve disc of thermal power plant and treatment method

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Before adding desalted water into the cleaning tank 1, close the circulation pump inlet valve 11 and the circulation pump outlet valve 9, close the sampling valve 8, and then prepare a cleaning agent with a citric acid concentration of 7% and a corrosion inhibitor concentration of 0.3 in the cleaning tank 1. %, reducing agent concentration 0.5%, the citric acid cleaning agent pH value is adjusted to 3.8 with ammonia water; Adopt strippable glue to coat the thread position on the workpiece 2 (main steam valve stem), after the strippable glue dries, put The workpiece 2 is bound with a hanger 3, immersed in the citric acid cleaning agent in the cleaning box 1, the cleaning box upper cover 4 is closed, and the exhaust valve 5 is opened; the inlet valve 11 and the outlet valve 9 of the circulation pump 10 are opened to start the cycle Pump 10...

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PUM

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Abstract

The invention discloses a treatment system for oxide skin of a main valve rod and a valve disc of a thermal power plant and a treatment method. After the main valve rod and the valve disc with an oxide skin jamming problem are disassembled, high-temperature-resistant and acid-resistant peelable glue is used for coating threads, bare holes and other parts on parts of the valve rod and the valve disc; then the valve rod and the valve disc are put into citric acid cleaning liquid with the concentration being 6%-8% and the pH value being 3.5-4.0, oxide skin on the surfaces of the valve rod and the valve disc is dissolved under the condition of 85-95 DEG C, and after most of the oxide skin is removed and the oxide skin remaining on the surfaces of the parts is loose and soft, dissolving of the oxide skin is completed; the residual cleaning agent on the parts is washed away with alkaline water, and the parts are blow-dried with cold air; and then the valve rod and the valve disc are polished through a mechanical method, and the oxide skin on the surfaces of the parts is cleaned. The treatment system is simple, the treatment method is easy to operate and implement, the removal effect of the oxide skin on the surfaces of the parts such as the valve rod and the valve disc is improved, and the mechanical damage risk of the parts is reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical cleaning of a main steam valve stem and a valve disc of a thermal power plant, and in particular relates to a system and method for treating oxide scales of a main steam valve stem and a valve disc of a thermal power plant. Background technique [0002] The high and medium pressure main steam valve and regulating valve are protection devices for thermal power unit steam turbines to quickly cut off the steam intake of the steam turbine and realize shutdown. The rapid switch is the key measure to prevent safety accidents such as overspeeding of the steam turbine, broken shafting, and scrapping of the steam turbine. The jamming of the high and medium pressure main steam valve and the adjustment valve is a safety hazard that thermal power plants focus on preventing at present. The formation and shedding of oxide skin on the surface of the material is one of the main reasons for the jamming of the high...

Claims

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Application Information

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IPC IPC(8): C23G3/00C23G1/04C23C22/73C23C22/60F17D1/14F17D3/01
CPCC23G3/00C23G1/04C23C22/73C23C22/60F17D1/14F17D3/01
Inventor 刘锋胡杨张瑞祥韩传高姚尧武方杰
Owner XIAN THERMAL POWER RES INST CO LTD
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