What are constant-speed and constant-torque turbines?
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I have just started working with steam turbines. According to the information I’ve found, there are steam turbines that maintain a constant speed and are used for power generation； There are those with constant torque, used for steam drive. I’m wondering how they manage to maintain a constant speed and a constant torque respectively. Why are different control methods used? How are speed and torque adjusted? I would appreciate some guidance from those who know more; looking forward to your reply
The speed of both gas turbines used for power generation and steam-driven turbines is regulated through the steam inlet valves. However, the speed of power generation turbines remains constant at 3000 revolutions per minute; after connection to the grid, any increase in speed is adjusted by changing the electrical load on the turbine. Once the electrical load is set, the turbine’s speed is automatically adjusted by a controller to ensure that the specified load is delivered； Steam-driven turbines feature constant torque control; once the speed is set, it is automatically adjusted by the control valve through an electro-hydraulic converter to maintain that speed ；