Regarding hydraulic energy recovery turbines
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Dear marine friends, have you come across hydraulic energy recovery turbines? I’m not quite clear about this yet. If a hydraulic recovery turbine drives a pump (with a motor and clutch), how much energy can this turbine save under normal conditions? 30%~50%? If the voltage of the pump motor is 6000V and the current of the turbine before it starts operating is 120A, then is it possible for the current to drop to 60A once the turbine is running? Also, under normal operating conditions, if the pump’s speed is around 3000 rpm, what would be the approximate speed of this turbine? Over 1,000 revolutions? Exactly 3000 rpm? Or drive the pump above 3000 rpm? Thank you all!
The hydraulic turbine in our unit has an output of around 25%, which is the value specified in the design. To determine the actual energy-saving effects during operation, it is necessary to calibrate the hydraulic turbine in order to obtain accurate data on its performance. In fact, the speed of an asynchronous motor cannot reach 3000; it’s around 2980. The speed of a hydraulic turbine is the same as that of the motor. The maximum speed is 3300 revolutions; once this limit is exceeded, the clutch disengages automatically.
We are specialized in manufacturing hydraulic turbines; we can help answer any questions you may have.
A hydraulic turbine is an energy recovery device that converts the internal energy of the high-pressure medium at the outlet of a thermal hydrodesulfurization tower into kinetic energy for output. It can be used to drive the hydrogen feed pump, which is driven by a hydraulic turbine in combination with an explosion-proof asynchronous motor. 7. During startup, keep the turbine running at a warm-up speed of 1000 rpm to 1500 rpm, check its operation; once it is confirmed to be functioning properly, with no abnormal noises, and when the bearing temperatures, vibrations, and seal leaks are all within normal limits, continue to maintain this speed of operation. After about 15 minutes, ensure that the temperature of the turbine casing remains around 200°C and that the temperature difference between the upper and lower casings is ≤10°C. Then gradually increase the flow control valve at the inlet, allowing the turbine to reach a speed of 2950 rpm. The seal fluid pressure should be 0.2 to 0.3 MPa higher than the turbine outlet pressure. At this time, the inlet manual valve outside continues to be opened until it is fully open, with the inlet flow being controlled by the flow control valve. Control the hydraulic turbine inlet flow to operate above its minimum flow rate.
The speed of the hydraulic turbine must be higher than the rated speed of the motor; otherwise, how can the current be reduced?