Supercritical unit water-feeding pump turbine protection system and use method thereof
A technology for feed water pump steam turbine and supercritical unit, which is applied in the directions of machines/engines, mechanical equipment, engine components, etc., can solve the problems of insufficient reliability and low safety of protection devices, and achieves improved reliability, improved reliability, and reduced The effect of the false rate
Active Publication Date: 2015-08-26
MAANSHAN DANGTU POWER GENERATION
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Problems solved by technology
[0010] The invention overcomes the defects of low safety and insufficient reliability of the protection device of the existing feedwater pump turbine, provides a supercritical unit feedwater pump turbine protection system and its use method, and realizes the reliability and safety of the feedwater pump turbine protection system The goal of a significant increase in sex
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Embodiment 1
[0039] combine figure 1 and figure 2 , the supercritical unit feed water pump steam turbine protection system of this embodiment includes EH oil tank 1, EH oil pump group, protection device main body 4 and pressure switch device, EH oil pump group includes EH oil A pump 2 and EH oil B pump connected in parallel 3. The oil outlet of EH oil tank 1 is divided into three routes after passing through the EH oil pump group, among which: the first route is connected to the main steam valve of the steam turbine of the feed water pump; Oil port; the third way is connected to the pressure switch device and returns to the oil return port of EH oil tank 1. The protection device main body 4 includes a control module 401, an AST solenoid valve A402, an AST solenoid valve B403, an orifice A404, and an orifice B405. The AST solenoid valve A402 is connected in parallel with the orifice A404, and the AST solenoid valve B403 is connected in parallel with the orifice B405. , the AST solenoid v...
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The invention discloses a supercritical unit water-feeding pump turbine protection system and a use method thereof and belongs to the technical field of water-feeding pump turbine protection devices. The water-feeding pump turbine protection system comprises an EH oil tank, an EH oil pump set, a protection device main body and a pressure switch device. An oil outlet of the EH oil tank is divided into three paths through the EH oil pump set, wherein one path is connected to a water-feeding pump turbine main valve; the second path returns to an oil returning port of the EH oil tank after being connected to the protection device main body; and the third path returns to the oil returning port of the EH oil tank after being connected to the pressure switch device. The RB movement trigger conditions of a water-feeding pump are that (1) after the latching of a water-feeding pump turbine, two output signals are selected randomly; (2) NOT operation is performed on the two randomly selected output signals; (3) the water-feeding pump RB movement is triggered when the two output signals are yes after the NOT operation. The goal of remarkably improving reliability and safety of the water-feeding pump turbine protection system is achieved.
Description
technical field [0001] The invention relates to the technical field of protection devices for feedwater pump turbines, and more specifically relates to a protection system for feedwater pump turbines of supercritical units and a method for using the same. Background technique [0002] Supercritical units in thermal power plants refer to units in which the parameters of the working medium in the boiler reach or exceed the critical pressure. The working medium in the boiler is water, and the critical pressure of water is: 22.115MPA, 374.15°C; at this pressure and temperature, the latent heat of vaporization of water and steam conversion is equal to zero, and there is no two-phase region, that is, water turns into steam continuously It is carried out in a single-phase form, which is called the critical point of water, and the pressure of the working medium in the furnace is greater than this pressure, which is a supercritical boiler. [0003] Existing thermal power plants gene...
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IPC IPC(8): F01D21/00F01D17/26F01D15/08
CPCF01D15/08F01D17/26F01D21/00F05D2220/31
Inventor 卫平宝王传奇桂汉生赵仕剑杜家云郭猛杭云
Owner MAANSHAN DANGTU POWER GENERATION