Double-control device and method for low waterhead Kaplan turbine

Abstract

The invention belongs to hydraulic mechanical engineering, and particularly relates to a double-control device and method for a low waterhead Kaplan turbine. The device is characterized in that a first three-way valve (12) is connected onto a first oil pipe (14) between a blade distributing valve (10) and a blade servomotor (11), and a second three-way valve (13) is connected onto a second oil pipe (15) between the blade distributing valve (10) and the blade servomotor (11). The device has the advantages that: 1, a stand water-wheel power generation set can be prevented from raising during the processes of shutting down or converting from a power generation working condition to a phase modulation working condition, reduce the axial backward thrust of a horizontal water-wheel power generation set to a flow pair unit during the two processes, so the stability of the unit is improved; 2, the device is beneficial to shutting down the unit, and the braking torque is increased; the device is beneficial to shortening the time for the process of converting from the power generation working condition to the phase modulation working condition, so the unit is quickly shifted to a stable state; and 3, the device has a simple structure, is safe and reliable.

Description

technical field [0001] The invention belongs to hydraulic mechanical engineering, in particular to a dual adjustment device and method for a low-head swirling water turbine. Background technique [0002] The regulation system of the low-head rotary paddle turbine is double regulation, that is, the movable guide vane of the turbine is linked with the runner blade. It has been proved by experiments and practice that the low-head turbine adopts double regulation, which can enable the turbine to obtain a wider high-efficiency area, improve the overall efficiency of the turbine, maximize the use of water energy, and obtain the maximum kinetic energy. The double adjustment is adjusted in this way: with the increase of the output of the unit, the opening of the movable guide vane increases, the application flow of the turbine increases, the angle of the runner blade increases, and the output of the unit decreases; vice versa; when the unit stops, the opening of the movable guide va...

AI Technical Summary

Problems solved by technology

This adjustment is well known, but there are two problems. It is correct to improve the efficiency of the turbine and obtain the maximum energy during normal operation and start-up. However, it is correct when the turbine is shut down or transitioned from power generation to phase modulation. The hydraulic turbine has a transition period from the working condition of the turbine to the working condition of the reverse pump and the phase modulation and compression. At this time, this adjustment: 1. During the period of shutdown or transition from power generation to phase modulation (phase modulation and compression), the turbine has In the working condition of the reverse water pump, in this case, the decrease of the opening of the guide vane, the decrease of the flow rate of the unit, and the decrease of the angle of the runner blades are the increase of the head of the reverse water pump, which becomes the cause of the shutdown of the vertical unit and the lifting of the machine during the transition process. The main factors, such as Gezhou unit shut down and lift up, and the Syrian Dishlin power station unit designed by our institute is lifted during the process of phase modulation and compression, etc., increase the axial rear thrust of the horizontal unit, which reduces the stability of the unit

2. At this time, the unit does not need to obtain a lot of water energy and needs to stop quickly or the transition process is completed quickly. According to the above adjustment, the movable guide vanes of the water turbine are all closed to 0 opening, and the runner blades will be reduced to the minimum angle position. Small, can make the turbine get the maximum water energy in the process, which is not conducive to the reduction of shutdown and transition time

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