A method for preventing water hammer pressure rise in water diversion system of hydraulic turbine
A technology of water diversion system and hydraulic turbine, which is applied in the direction of hydropower generation, mechanical equipment, engine components, etc., can solve the problems of high cost of surge wells, etc., and achieve the effect of reducing project cost, reducing construction cost, and simple structure
Active Publication Date: 2016-05-25
POWERCHINA XIBEI ENG
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Problems solved by technology
However, the cost of setting up the surge well is relatively high
Method used
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[0029] Such as figure 1 , figure 2 As shown, there is a bypass pipe 2 on the water diversion pressure steel pipe 1 at the upper end of the hydraulic turbine volute 8 inlet unit maintenance valve 9, and the bypass pipe 2 is connected to a maintenance valve 3 and a flow regulating energy dissipation valve 4, and the flow regulating energy dissipation valve 4 A drainage pipe 5 is connected to the downstream side, and the drainage pipe 5 leads to the tailwater channel 6 or the tailwater tunnel 10 of the power station.
[0030] When the load rejection speed of the unit rises, the turbine speed control system controls the movable guide vane 7 to be quickly closed or closed to meet the requirements of the unit speed. Since the movable guide vane 7 is closed small or the closing speed is fast, the water flow speed of the water diversion system will be sharp. The pressure of the volute 8 and the penstock 1 increases rapidly, and the pressure of the tailrace tunnel 10 decreases. In or...
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The invention belongs to hydraulic mechanical engineering and particularly relates to a method for preventing surge pressure of a water turbine water diversion system from rising. The water turbine water diversion system comprises a water turbine volute, a movable guide vane and a diversion pressure steel pipe, a by-pass pipe is arranged on the diversion pressure steel pipe at the upper end of an inlet unit service valve of the water turbine volute, the by-pass pipe is connected with the service valve and a flow control energy dissipation valve, and a drain pipe is connected to the downstream side of the flow control energy dissipation valve and leads to a power station tailrace or a tailrace tunnel. According to the method for preventing surge pressure of the water turbine water diversion system from rising, a surge tank is eliminated or the size of the surge tank is decreased, the water diversion system design is optimized, and the engineering cost is decreased. Beyond standard requirements are adjusted, guaranteed and calculated, the surge pressure and the unit speed rising are decreased, and requirements of the unit speed and volute maximum pressure rising and tailrace tunnel pressure reduction are met.
Description
technical field [0001] The invention belongs to hydraulic mechanical engineering, in particular to a method for preventing water hammer pressure from rising in a water diversion system of a water turbine. Background technique [0002] During the operation of the hydropower station, due to the sudden change of the load of the power system (such as sudden load shedding due to an accident, or starting the unit or increasing the load in a short period of time), the balance between the load of the turbine and the generator is destroyed. The unit speed will change. At this time, the automatic governor of the hydropower station quickly adjusts the opening of the movable guide vane to change the reference flow of the turbine, so that the output of the turbine and the load of the generator can reach a new balance, and the speed of the unit returns to the original rated speed. Due to the change of the load, the opening of the movable guide vane, the flow of the turbine, the head of t...
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IPC IPC(8): F03B11/00F03B15/06
CPCY02E10/20
Inventor 王耀洲
Owner POWERCHINA XIBEI ENG