Steam turbine pump control cylinder servo system and control method

Abstract

The invention relates to a steam turbine pump control cylinder servo system and control method. The steam turbine pump control cylinder servo system comprises an oil cylinder, a servo driver, a servomotor and a hydraulic oil pump, and further comprises an oil supplementing tank, a displacement sensor and a position controller; the displacement sensor, the position controller, the servo driver andthe servo motor are electrically connected; the position controller is electrically connected to a steam turbine control system, and the oil supplementing tank is connected to an input port of the hydraulic oil pump through an oil suction filter, a one-way valve and an oil inlet pipeline in sequence; and the hydraulic oil pump is connected to the oil cylinder through a hydraulic control one-way valve and an overflow valve in sequence, a reset spring used for pushing a piston arranged in the oil cylinder is further arranged in the oil cylinder, the piston is connected to a steam turbine adjusting valve, and the oil cylinder is connected to the oil supplementing tank through an unloading electromagnetic valve. According to the steam turbine pump control cylinder servo system, pressure oil is output in two directions through the two-way hydraulic oil pump to control the oil cylinder, meanwhile, opening and closing of the steam turbine adjusting valve are controlled, and the oil cylindercan be directly closed by controlling the unloading electromagnetic valve through a quick-closing instruction.

Description

technical field [0001] The invention relates to the technical field of steam turbine control, in particular to a steam turbine pump control cylinder servo system and a control method thereof. Background technique [0002] Industrial steam turbines are large-scale high-speed prime movers. They usually work under high temperature and high pressure. Their regulating valves require large driving force, fast response and high-precision control. Generally, electro-hydraulic servo control systems are used. Traditional steam turbine electro-hydraulic servo systems use The valve-controlled cylinder servo control form, that is, the pressure oil is supplied by the oil source system, and the oil cylinder is controlled through the electro-hydraulic servo valve (also called "oil motor"). Oil source pressure can be divided into low-pressure turbine oil-electro-hydraulic servo system and independent high-voltage electro-hydraulic servo system. [0003] (1) Low-pressure turbine oil-electro-...

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Problems solved by technology

[0003] (1) Low-pressure turbine oil-electro-hydraulic servo system, the system oil source is shared with lubricating oil, including oil filter device, safety oil pressure establishment device, OPC solenoid valve, electro-hydraulic servo valve, wrong throttle slide valve, oil cylinder and displacement sensor, etc. Composition, low-pressure turbine oil electro-hydraulic servo system has low pressure oil, generally less than 2MPa, large oil cylinder design, slow response, and poor anti-pollution ability of the system due to sharing oil source with lubricating oil

[0004] (2) Independent high-voltage electro-hydraulic servo system, the system is designed with a set of independent hydraulic oil station, the oil supply pressure is relatively high, generally 10~MPa, according to different working fluids, it can be divided into high-pressure anti-fuel system and anti-wear oil system, because the anti-fuel is toxic and difficult to degrade, the design of the high-pressure anti-fuel system is more complicated

[0008] Although the content provided by the above patents can solve the defects of valve-controlled cylinder-type electro-hydraulic servo systems such as low-pressure turbine oil electro-hydraulic servo systems and independent high-voltage electro-hydraulic servo systems, it focuses on improving the operating efficiency of hydraulic presses and bending machines. There is no in-depth elaboration on the position control of the hydraulic cylinder, the quick closing operation of the cylinder cannot be realized, and the control requirements of the steam turbine control valve cannot be met

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