inconsistent load will cause steam turbine hunting.
In large turbines, a valve controls steam flow to groups of nozzles. The number of open valves controls the number of nozzles in use according to the load. A bar-lift or cam arrangement operated by the governor opens and closes these valves in sequence. Such a device is a multi-port valve. Using nozzles at full steam pressure is more efficient than throttling the steam.
governor senses the speed of spindle of engine and controls the mechanism of opening and closing of throttle valve
Why extractions are taken out from steam turbine.
Rankine cycle is used in steam turbine
Steam turbine nozzle clearance is the total energy content available in steam. This is through a valve.
In large turbines, a valve controls steam flow to groups of nozzles. The number of open valves controls the number of nozzles in use according to the load. A bar-lift or cam arrangement operated by the governor opens and closes these valves in sequence. Such a device is a multi-port valve. Using nozzles at full steam pressure is more efficient than throttling the steam.
When the steam turbine can not maintain its selected or designed speed.Type your answer here... Speed fluctuating from low to high speed continously.
Steam turbines run with a speed governor which responds to changes in turbine rotational speed and operates on the steam admission valves. Thus if the network that the turbine generator feeds has a change in frequency, the turbine responds. If extra load comes onto the network, the frequency drops slightly, the generator slows and the turbine must follow (they are solidly locked together) so that the governor then opens the steam valves to try to keep the speed steady. The converse happens if the network suddenly loses load.
The boiler heats water into steam. The steam is pressurized and fed into a turbine which causes it to rotate. As the steam turbine rotates, the connected generator rotates and produces electricity. Make Sense??? Please 'Recommend Contributor'
The volume increases in each turbine stage as the expanding steam passes through the turbine blades. This expansion of steam causes an increase in volume and a corresponding decrease in pressure and temperature.
governor senses the speed of spindle of engine and controls the mechanism of opening and closing of throttle valve
It could overspeed and wreck itself-but there are emergency stop valves as well as the governor, so it is unlikely.
Why extractions are taken out from steam turbine.
Steam is redirected back into the boiler from the high-pressure turbine for reheating, but the steam from the low-pressure turbine enters into a condenser to become water again.
The preventive maintenance of steam turbine mainly entails frequent servicing of the parts. This will ensure a smooth performance of the steam turbine.
manish
Rankine cycle is used in steam turbine