N300MW unit of high pressure regulating valve fault handling 1)

dam power generation co. , LTD. High pressure control pneumatic valve loose diffusion problem # # steam turbine operation co. , LTD. , analyzes the causes of loose, and through the overhaul, puts forward treatment deal with these problems, in order to ensure the safe operation of the unit. Introduction power generation co. , LTD.
dam in the improvement of N - # steam turbine co. , LTD 。 / / subcritical reheat steam domestic production, single cylinder four condensing steam turbine exhaust. There are two high pressure main steam pneumatic valve, pneumatic pressure control valve, medium pressure pneumatic valve co. , LTD. Adjust the digital electro-hydraulic control system ( 电气设施, V） MW load # #, #, #, #, high pressure control methods of pneumatic valve is fully open. Fault condition

July morning of points, maintenance personnel in the process of inspection equipment, heard that # # steam turbine high pressure control valve spacing between different sound, but to the scene, the relevant professionals, different tones don't appear again. Around noon: in February, equipment maintenance personnel in the process of inspection, listen to the abnormal noise of # # steam turbine regulating gate interval vapor pressure, and then with the related professional personnel to the scene, the field staff confirmed the judgment of the differences from # high-pressure pneumatic control valve, and of the same type unit defective pressure to adjust the internal structure of pneumatic valve, preliminary judgment is due to abnormal sound diffuser caused by pressure regulating pneumatic valve is loose. Company leaders will report the high-pressure pneumatic control valve # after breaking off, in order to avoid high profile extrusion equipment water diversion gate clock diffusion caused by accident.

analysis this type of unit pressure regulation of the pneumatic valve is on the body are installed the use of the diffuser. In interference quantity referred to as the original design is the manufacturer's installation instructions. Mm? 。 Mm, as well as between the diffuser and reinforce a FMM cross the needles. But in the actual operation of steam parameter change, spread and are subject to the effect of alternating thermal stress, coupled with the high speed of effective diffusion of steam flow, so that the diffuser running loose. For steam turbine co. , LTD. Turbine type design, in its early days, production unit, the technical conditions and the limitation of the MW of operating experience, due to the interference of insufficient expansion force, pressure regulation of the pneumatic valve loose spread widely, and cannot handle operation, reduce the temperature after shutdown, diffuser swelling after cooling the body, make the maintenance personnel to prove that diffusion is loose. Electricity co. , LTD. , the turbine is high pressure pneumatic valve control type of similar problems. This site keywords: pneumatic ball valve pneumatic ball valve pneumatic pneumatic valve pneumatic pneumatic valve pneumatic butterfly valve pneumatic butterfly valve pneumatic actuator pneumatic actuators