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Steam Turbine Turning Gear - Turning gear is utilized on turbines to reduce eccentricity or out of round of the rotor. When a rotor is standing still it has a tendency to sag due to its weight.
While running a turning gear which is a separate motor that turns the rotor slowly 10-50 RPM through a clutching mechanism. This rotation keeps the rotor in balnace.
It is very important to run the turning gear on shutdowns and start ups. The time required to run is dependent on the size of your unit.
Typically the turning gear must be on for 12-36 hours for small to large steam turbins after shutdown and 2-16 hours prior to a turbine start.
If a turning gear is not utilized the rotor will become eccentric and may cause vibration up to wiping rotating parts with the stationary parts causing catastrophic failure.
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What uses a compound gear train?
Any power plant that uses more than a single steam turbine as a prime mover. It could be a power plant, or a ship for instance. They use a compound gear train to get everything going the same way at the same time and at the same speed.
What does a gear box on a wind turbine do?
The gear box increaces the rotational speed from about 30-60. The gear box is very costly and heavy.
What is turbine rated speed and What is maximum speed rise of steam turbine?
Turbine rated speed varies mainaly on the factors of Generating frequency and means of coupling to generator (viz trough a gear box or directly coupled and no.poles in generator). For exmple a 50hz generting frequency and a bi-pole genarator the turbine speed is 3000RPM. The allowed speed rise also depends on turbine design and generator operational range. Generaly the speed rise is restricted to Maximum of 10% of the rated speed.
What is a turbine barring gear?
When a large turbine rotor stops it will still be hot and will tend to bend in the middle if left to cool normally. To prevent this the barring gear will turn the rotor slightly at given intervals during the cool down period.
How does the rotary steam engine work?
The rotary steam engine has two identical lobed gears inside a tightly sealed casing to which each lobe of each gear is sealed often with a sliding vane to prevent slippage. One gear may be free spinning, it imparts its power to the other gear, the second gear (or both) drives a shaft which is often connected to a pump or pumps. The steam enters the engine at one side between the gears, it causes the gears to rotate and the steam moves outward around the periphery of the casing, expanding [due to the shape of the casing] as it pushes the gear lobes around to the exhaust side of the engine, where the steam is exhausted either to the atmosphere or a jet condenser, for reuse. Steam power fire engines typically used rotary steam engines. **See the attached Image below.
What is warm rolling of steam turbine?
You don't start a large turbine cold. Typically, the lubrication system is started, the turning gear is engaged and warming steam (a small amount of steam, not enough to turn the turbine) is admitted to the turbine to warm and initially expand the shaft and casing. If this isn't done, thermal shock from the admission of high pressure superheated steam into the cold turbine could damage it.
What is the use of turning gear main motor and piggy motor in steam turbine?
The turning gear main motor and piggy motor in a steam turbine are used for maintaining the turbine's rotation during startup and shutdown phases. The turning gear main motor provides slow rotation of the turbine shaft to ensure proper lubrication and prevent thermal stress on the components. The piggy motor, often a smaller auxiliary motor, assists in this process by allowing for fine adjustments or providing additional support during low-speed operations. Together, they help maintain the integrity and longevity of the turbine system.
What is the difference between turbine turning gear and barring gear?
both are same using for rotating the turbine initially
Where are ratchet mechanisms used?
Ratchet mechanisms used in Gas power plant for Gas Turbine. (like Barring gear in steam turbine).
What analogy is used to describe the gear system of a wind turbine?
Newton's third law governs in the turning of gears. Basically a torque is formed due to a coupling force. Now a large gear is joined with the pivoted point of the blades. When the blade turns the gear turns too turning other gears as well. Now why i said a large gear turning small gears is that for one rotation of a large gear a small gear does more rotation. So a small gust of wind turning the large gear to 1/100 th rotation turns the smaller gears to maybe 5 rotations. Now to the amazing part. Getting to produce the electricity. The gears turning is connected to a dynamo. The dynamo is responsible for producing the required electricity. And that is the total analogy of a wind turbine.
How do you calculate rpm of a wind turbine?
You can calculate the rotation speed (rpm) of a wind turbine by dividing the rotational speed of the generator (usually given in revolutions per minute, or rpm) by the gear ratio of the turbine. The gear ratio is the ratio of the number of teeth on the turbine's gear to the number of teeth on the generator's gear. This formula allows you to determine the turbine's rpm based on the generator's rpm and the gear ratio.
How do steam engines generate force?
Steam at higher pressure and temperature - hence high energy contents - is fed via a valve into each end of the cylinder in turn. There its pressure forces the piston along the cylinder, hence turning the engine's crank to which the piston is linked by piston-rod, crosshead (a pivot on a sliding block) and connecting-rod. . The valve is driven in turn by an arrangement called the "valve gear" from the crankshaft, and this controls both the engine's direction of rotation and the "cut-off". This is the point in the piston stroke at which the valve closes so the steam already in the cylinder completes its work by expansion approximating to the normal [ (Pressure X Volume) = a Constant ], law of the behaviour of gases. . On steam locomotives, steam road vehicles and reciprocating marine engines the valve-gear's settings can also be controlled by the driver to change the forward-reverse (ahead / astern) direction as well as adjusting the cut-off for efficient running. . The above describes the reciprocating steam-engine, as on a railway locomotive. In steam-turbines the force is generated by a combination of impulse and reaction as the steam passes from the initial, inlet nozzles and through the rotor blades and fixed guide-vanes of each stage of the turbine. A turbine cannot be reversed so where this is necessary, as on a more-modern steam-ship or in a nuclear-powered submarine, and to reduce the high speed of the turbine to the low speed of the final drive, the turbine is linked to the drive through a reducing / reversing gear-box.
What uses a compound gear train?
Any power plant that uses more than a single steam turbine as a prime mover. It could be a power plant, or a ship for instance. They use a compound gear train to get everything going the same way at the same time and at the same speed.
What does a gear box on a wind turbine do?
The gear box increaces the rotational speed from about 30-60. The gear box is very costly and heavy.
What is turbine rated speed and What is maximum speed rise of steam turbine?
Turbine rated speed varies mainaly on the factors of Generating frequency and means of coupling to generator (viz trough a gear box or directly coupled and no.poles in generator). For exmple a 50hz generting frequency and a bi-pole genarator the turbine speed is 3000RPM. The allowed speed rise also depends on turbine design and generator operational range. Generaly the speed rise is restricted to Maximum of 10% of the rated speed.
How does a bevel gear work?
bevel gear is driven by a ring gear thus turning the axles
While turning how to change gear of motor bike?
I think with a car or a motorbike you shouldn't change gear while you are turning. Change gear before you get to the corner or change when you come out of the corner
