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casing and shaft are made of alloy steel they are supposed to expand when heated (at/2 *length of turbine.).where
a is coefficient expansion of material.
t=final
temperature ( of casing or shat)-ambient
temperature
l=
length of turbine in meter
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∙ 11y ago
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What is meant by axial displacement in steam turbine?
Axial displacement is the motion along the shaft of the turbine caused by the force exerted by the steam or by the thermal expansion of the shaft and casing.
What to do about turbine rotor differential expansion?
my LP turbine differential expansion increase ,when rated gland steam temperature maintain.
What is interlocks in steam turbine?
Interlock system is in turbine for protect the turbine. different types of interlocks in turbine 1. high vibration, 2. Bearing oil Temp,3. vacuum related, 4. over speed, 5. differential expansion, 6. casing expansion, 7. lube oil header Pressure. 8. Axil shift. etc... . this interlocks is keep the turbine in safe mode in any abnormalities.
Why turbine blades are largenr in size at exhaust end?
Because the steam expands as it passes through the turbine. The steam velocity through the turbine is constant from steam chest to exhaust hood (though it changes in each stage). Thus, the space needed for the steam to expand needs to be expanded to correspond with that expansion of the steam.
Why LP turbine diaphragm breaks?
Lp turbine diaphragm breaks due to positive pressure inside the condenser because of steam expansion.
What is absolute expansion of steam turbine?
it's the thermal expansion in the casing of hp or ip turbine can be noticed by journal or thrust bearing when moving <<
What is meant by axial displacement in steam turbine?
Axial displacement is the motion along the shaft of the turbine caused by the force exerted by the steam or by the thermal expansion of the shaft and casing.
What is a steam turbine?
It is an engine.A steam turbine is a heat engine that uses the expansion of steam passing through stationary nozzles and blades on a shaft to turn the shaft. The steam can move through the turbine axially (one end of shaft to the other end), radially (shaft to outer casing), or tangentially (around the outer edges of the turbine wheel). In an impulse turbine, the steam is expanded in nozzles and pushes the blades. In a reaction turbine the steam is expanded in the nozzles AND in the blades, the reaction of the expansion of the steam pushes away from the blades spinning the wheel in the process. The expansion of the steam is necessary to increase its velocity through the turbine.
What is expansion turbine?
differential expansion is refer to differential distance between rotor blade and fix blade.rotor expand toward generator and casing expand toward control valve.when temperature increase ,expansion in casing and rotor.so rotor mass is less than casing which rotor expand more than casing.
What is steam turbine cylinder?
turbing casing
What is positive differential expansion of steam turbine?
Differential expansion means gap between fixed Blade & rotating blase of a turbine.. When steam enters into the turbine, rotor tends to expand towards generator side & casing tends to expand towards control valve side. If differential expansion increase then there is a possibility of reducing axial gap between rotor & fixed blades. When differential expansion is positive its means rotor expand more than the casing expansion. There is a limit upto +ve 5. If increases than +ve 5 it means we have to check front side tie rods status.
What to do about turbine rotor differential expansion?
my LP turbine differential expansion increase ,when rated gland steam temperature maintain.
What are the parts of steam turbine?
Steam turbine is a machine that extracts thermal energy from pressurized steam. It is made up of casing essential to which the blades are attached onto it and a rotor that carries the moving blades.
Where exactaly located thrust bearing in steam turbine?
Thrust bearings are mounted on turbines at or near the end of the shaft, closest to the steam chest (or inlet). This is to maintain the shaft in position with the casing of the turbine, allowing the casing and the shaft to expand evenly together toward the drive end of the turbine.
What is vaccume breaker in steam turbine?
A vacuum breaker is a check valve installed on the exhaust casing of a turbine. It opens to prevent the collapse of the exhaust hood when the turbine cools and the condensing steam produces a vacuum.
What is interlocks in steam turbine?
Interlock system is in turbine for protect the turbine. different types of interlocks in turbine 1. high vibration, 2. Bearing oil Temp,3. vacuum related, 4. over speed, 5. differential expansion, 6. casing expansion, 7. lube oil header Pressure. 8. Axil shift. etc... . this interlocks is keep the turbine in safe mode in any abnormalities.
How do you lower turbine differential expansion?
by controlling main steam flow
