Control device and method for steam turbine regulating valve
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A technology of steam turbines and regulating valves, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems that are huge, affect the normal operation of power stations, and are impractical
Active Publication Date: 2017-04-05
DAYA BAY NUCLEAR POWER OPERATIONS & MANAGEMENT +3
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Problems solved by technology
[0006] The Chinese patent mentioned above solves the problem of oil pressure shock by setting buffer holes. However, this method will inevitably require reprocessing of existing equipment, or direct replacement of equipment
For nuclear power plants, if the equipment is to be reprocessed or directly replaced, it needs to be shut down first, which will undoubtedly greatly affect the normal operation of the power plant
In addition, the equipment used is relatively complex and bulky, and reprocessing or direct replacement of the equipment will face a huge workload and high cost
Therefore, it is impractical to use the ideas provided by the above-mentioned patents to solve the oil pressure shock problem
Method used
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Embodiment 1
[0076] In this embodiment, the steam turbine control valve control device and method are mainly used to control the high pressure valve.
[0077] The following is a brief introduction to the control principle of the oil motor:
[0078] The oil motor mainly includes a proportional valve, a solenoid valve, a quick unloading valve (CVP) controlled by the solenoid valve, and a servo piston. The structure of the oil motor belongs to the prior art, and the embodiment of the present application does not describe it in depth.
[0079] Please refer to image 3 , is the functional schematic diagram of the proportional valve.
[0080] The proportional valve has four oil ports, P is the power oil port, A and B are the working oil ports, and T is the oil return port. Among them, the working oil port only uses the A port, and the A port can communicate with the oil engine oil cavity, and the B port is blocked. The position of the proportional valve spool is monitored by the LVDT (Linear...
Embodiment 2
[0115] In this embodiment, the steam turbine control valve control device and method are mainly used to control the medium pressure valve.
[0116] Through the research on the oil pressure shock of high and medium pressure valves, it is found that the reasons for the oil pressure shock of high and medium pressure valves are slightly different.
[0117] The fundamental reason for the oil pressure shock of the high-pressure valve is that the dead zone compensation setting of the control card is unreasonable, and the dead zone setting needs to be adapted to the slope of the SD-command valve position curve. The deadband needs to be extended at high slopes.
[0118] Please refer to Figure 12 , is the overpressure record of the diesel engine during the relevant medium pressure valve test. At the beginning of the test, the command valve position drops from 100% to 50% as a fast closing process, and then slow closing. At this time, the oil motor produces an oil pressure shock, whi...
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Abstract
The invention discloses a control device and method for a steam turbine regulating valve. The device comprises a load control loop and a valve position control loop. The load control loop comprises a load feedback deviation unit, a first PI regulating unit and a converting unit. The valve position control loop comprises a valve position correction unit, a valve position deviation unit, a second PI regulating unit and a dead-zone compensation unit. The control device and method for the steam turbine regulating valve optimize control, and are used for accurately controlling the opening degree of the regulating valve and capable of reducing risk of oil pressure impact and eliminating abnormity. Accordingly, fully loaded running of a steam turbine set of an electric power station can be achieved, power reduction running is avoided, the electric power generating efficiency of the electric power station is improved, normal running of the electric power station is guaranteed, and great economic value is created for the electric power station. In addition, the control device and method can be applied to construction and daily running of a ling'ao nuclear power station (phase II) and other nuclear power stations and make great contribution to optimization of power station construction.
Description
technical field [0001] The present application relates to the field of steam turbine valve control, in particular to a steam turbine control valve control device and method. Background technique [0002] Ling Ao Phase II Nuclear Power Plant used proportional valves to control turbine valves for the first time. During the daily monitoring and maintenance of Ling Ao Phase II Nuclear Power Plant, technicians found that the relevant high-pressure regulating valves were prone to oil pressure shock. When the oil pipe leaks due to the impact of oil pressure, the valve position of the high pressure valve will be difficult to control, resulting in loss of control of the turbine power control. If the intervention is not timely, the liquid level of the fuel tank will drop, which will cause the unit to trip directly. [0003] From 2011 to 2013, during the regular test of medium pressure valve activities on the relevant medium pressure valves, 6 of the oil-driven pressure gauges of the ...
Claims
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Patent Type & Authority Applications(China)
IPC IPC(8): F01D17/24
CPCF01D17/24
Inventor 夏红卫崔毓鸣朱建月王博
Owner DAYA BAY NUCLEAR POWER OPERATIONS & MANAGEMENT
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