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Why is it necessary to open casing drains and drains on the steam line going to the turbine when a turbine is to be started?
To avoid slugging nozzles and blades inside the turbine with condensate on start-up; this can break these components from impact. The blades were designed to handle steam, not water.
What is a wet start in turbine engines?
Normally when starting a turbine engine, the starter is used to get the turbine up to operational speeds, then fuel is pumped in with the ignition active. A "wet start" is a start where the engine is being started with a quantity of fuel already pooled in the engine (perhaps the result of a previous failed start) or the pilot delays ignition beyond what is normal and allows fuel to pool in the engine before ignition. Wet starts can result in a fire plume or a loud bang, and may damage the engine. The most dramatic damage will be to the compresser turbine blades due to pressure and heat failure.
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 do you mean by turbine synchronization?
During a typical power plant startup, all components of the power plant are started slowly. The turbine is first rolled at a slow rpm. Then the rpm is increased gradually to a point where it can match the frequency of the grid. At this point, the turbine can be synchronized with the grid and start outputting electricity into the grid.
What is difference between radial flow turbine and axial flow turbine?
in a radial flow turbine the steam enters the turbine in the direction of its radius and leaves it in the direction of the axis of the shaft. in a axial flow turbine the steam enters the turbine in the direction of the axis of the shaft and leaves the turbine in the same direction.
What are the turbine generator start up rmp for a cold start?
It may be depends on the Constructor/ Design of Turbine .
What steps needs for start a steam turbine from cold conditon?
steam turbine cold start up list:
What is turbine drain valve?
When steam is introduced to a turbine during start up, drain valves are fully open. They drain to the condenser until the turbine reaches a certain load. Once that load is reached, the valves are closed and turbine runs normally.
How much time a steam turbine takes to start?
It take few second to start but to start proper work it take the few minutes
What are the advantages of free turbine engine over gas turbine engine?
A gas turbine engine will usually yield more power by weight than a piston engine. Main downside is that it can't be throttled very well. Energy efficiency isn't all that good to start with, and will drop right down if it has to be operated outside its optimum range.
Why is it necessary to open casing drains and drains on the steam line going to the turbine when a turbine is to be started?
To avoid slugging nozzles and blades inside the turbine with condensate on start-up; this can break these components from impact. The blades were designed to handle steam, not water.
What is a wet start in turbine engines?
Normally when starting a turbine engine, the starter is used to get the turbine up to operational speeds, then fuel is pumped in with the ignition active. A "wet start" is a start where the engine is being started with a quantity of fuel already pooled in the engine (perhaps the result of a previous failed start) or the pilot delays ignition beyond what is normal and allows fuel to pool in the engine before ignition. Wet starts can result in a fire plume or a loud bang, and may damage the engine. The most dramatic damage will be to the compresser turbine blades due to pressure and heat failure.
What is purpose to spray in exhaust hood of steam turbine?
The purpose of exhaust hood spray is to decrease the temperature of steam turbine last stage that is probably LP. This is operate on low load specially at start up and shut down of steam turbine when the temperature at the outer most edge of the turbine blades of that stage is very high and As we know that the steam flow also decrease The temperature of turbine blade.
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 HP and LP turbine expansion?
HP Turbine is High Performance Turbine LP Turbine is Low Performance Turbine
What do you mean by turbine synchronization?
During a typical power plant startup, all components of the power plant are started slowly. The turbine is first rolled at a slow rpm. Then the rpm is increased gradually to a point where it can match the frequency of the grid. At this point, the turbine can be synchronized with the grid and start outputting electricity into the grid.
Would a turbine be a chemical or physical change?
Turbine is not a change, a turbine is a mechanical device.
