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'
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.
becouse this steam is use repetdly for the turbine
The preventive maintenance of steam turbine mainly entails frequent servicing of the parts. This will ensure a smooth performance of the steam turbine.
Rankine cycle is used in steam turbine
manish
Steam (under pressure) comes into contact with the blades of the turbine through which it is flowing and, by the direct application of force, causes the blades to move, turning the turbine shaft. The turbine coverts the thermal energy of the steam into (rotating) mechanical energy. Surf on over to our friends at Wikipedia using the provided link and get more info. Oh, and check out the pics! Answer it depends what type of turbine one is using types of steam turbine 1 impulse turbine 2 reaction turbine in 1 st one steam is completely expanded inside nozzle and all pressure energy get converted in to kinetic energy using this impulse force turbine runs. in 2nd steam is multiple stage blades are used where high pressure superheated steam gets expanded inside the turbine in each stage and after each stage velocity of steam increases. very high temperature superheated steam is reaquired because it has very high specific volume which helps in reducing mass flow rate of steam.