Brief Introduction to Amendanent Plan of 300MW Turbine High-pressure Adjusting Valve Surfacing
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Introduce the trouble cause and surfacing technology plan of Zhanjiang power plant 300MW turbine high-pressure adjusting valve, analyze the technical problems which appear during the procession of welding and the technology measures which should be taken.Cite
This article introduces the manufacture and process test procedures for the end plate welding of main stop valve body and build up welding of main stop valve seat for STC's first subcritical 600MW steam turbine, and gives detailed solutions for every difficulty in manufacturing.
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Based on experience obtained in tackling troubles encountered by 300 MW,600 MW pure DEH controlled units of Dongfang Steam Turbine Co.Ltd.during installation and operation periods,normal troubles occurring in the high-pressure main stop valve and high-pressure control valve are classified as follows: seizing up and abnormal noise in operation of high-pressure control valve;steam leakage in bonnet and valve rod of main stop valve.The effective way to solve this problem is to secure enough gap between valve rod and pocket,suitable gap between valve disc and pocket,obey installation sequence strictly,guarantee sound sealing of all sealing surfaces.
Relief valve
Control valves
Leakage (economics)
Flow control valve
Safety valve
Valve actuator
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In this paper, Tongliao power plant 4 sets of 200 MW unit high pressure main stop valve pre opening and cause valve jam has carried on the detailed analysis, and put forward specific improvement measures, to ensure crew safety, stable operation, reliable basis is provided.
Safety valve
Valve seat
Root Cause Analysis
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Turbine are defined as the hydraulic machines which convert fluid energy (i.e., gases and liquids) into mechanical energy. This mechanical energy is used in running an electric generator which is directly coupled to the shaft of the turbine. Thus the mechanical energy is converted into electrical energy. Steam is the gaseous from of liquids (normally water). This steam is at high pressure is used to produce power plants. The steam so used will have high pressure and temperature, which may affect the other components (control valve, turbine blade etc.,) of the turbine, in turn affects the power generation. Our project aims at analyzing and control the defects caused in the control valves. Control valves are valves used to conditions such as flow, pressure, temperature, and liquid level by fully or partially opening or closing in response to signals received from controllers. Failure in control valve arises mostly due to heavy load, throttling movement of the steam, breaking in the stem and cone joint, bearing wear and washer wear. We have planned to rectify the above defects by analyzing the control valve no.2 in tuticorin thermal power station- tuticorin.
Bandwidth throttling
Flow control valve
Control valves
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