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The difference between impulse and reaction turbine goes here...... 1) In case of an impulse turbine the pressure remains same in the rotor or runners, but in case of reaction turbine the pressure decreases in runners as well as stators also. 2) In case of impulse turbine the pressure drop happens only in the nozzle part by means of its kinetic energy. In case of Reaction one the stators those are fixed to the diaphragm act as a nozzle.
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What is a boiler reheater?
In a reheat turbine the stean first enters high speed turbine so its temp and pressure reduces before entering low speed turbine so a reheater is used to reheat the cooled steam
In a pressurized water-reactor the primary cooling water?
Boils in the core and is used to turn the turbine
What is the steam in a power plant used for?
Mostly to drive the steam turbine. Smaller amounts may be used for in house tasks like preheating feed water.
What is dearater in thermal power plant?
It removes the gases present in the steam,given by heaters.dearater is necessary otherwise the gases in steam will corrode the boiler and also affect the turbine.
When boiler use cyclone separator and why?
for the purpose of water-steam separation. High efficiency separation is very important in order to: - prevent water droplet carryover into the superheater, where serious thermal damage can occur. - prevent the carryover of solids entrained in water droplets into the superheater and turbine blading, where deposits may form, which are difficult to remove. These deposits end up reducing turbine efficiency and causing superheater tube temperature increases, distortion or even burnout.
How steam turbines be classified?
1) Impulse turbine 2) reaction turbine
Comparison between impulse and reaction turbines?
in the case of impule turbine total energy at inlet is kinetic energy and in case reaction turbine energy at inlet is kinetic and pressure......
What is a stage of an impulse turbine?
In an impulse turbine, the stage is a set of moving blades behind the nozzle. In a reaction turbine, each row of blades is called a "stage." A single Curtis stage may consist of two or more rows of moving blades.
Is an impulse turbine makes use of draft tube?
No, an impulse turbine does not make use of a draft tube. In impulse turbines, the water is directed through nozzles to create high-velocity jets that strike the turbine blades, causing them to spin. Since the pressure is atmospheric at the exit of the turbine, a draft tube is not required to recover pressure or energy, as it is in reaction turbines.
Advantage of impulse turbine over reaction turbine?
Impulse turbines have the advantage of operating efficiently with high-pressure water, making them suitable for high-head applications. They can handle variations in water flow and pressure without significant performance loss, as they rely on the momentum of water jets rather than pressure differences. Additionally, impulse turbines typically have simpler designs and are easier to maintain compared to reaction turbines, which require more complex components to manage pressure changes.
Why reaction turbine have moreefficeancy than impulse turbine?
Reaction turbines are generally more efficient than impulse turbines because they convert both the kinetic and pressure energy of the fluid into mechanical energy. In a reaction turbine, the water flows through the blades, creating lift and allowing for continuous energy transfer as the fluid expands and loses pressure. In contrast, impulse turbines rely solely on the momentum of the water jets, leading to energy losses during the conversion process. Additionally, reaction turbines can operate effectively across a wider range of flow conditions, optimizing their performance.
What is steam velocity in turbine?
That is how fast the steam is actually moving in the turbine. For impulse turbines it is twice as fast as the turbine blades. In reaction turbines it is the same speed as the blades. Because the blades of a turbine cannot move faster than 4500 feet per second without self destructing as it overcomes the centripetal force of the turbine wheels, the steam turbine is designed such that no turbine will exceed more than ~1150 feet per second on its tip speed. Thus the steam velocity through the turbine will be less than ~1150 fps for a reaction turbine and less than ~2300 fps for an impulse turbine, or about ~1570 mph, more than twice the speed of sound.
Diagram of gas turbine?
A diagram of an impulse turbine is in related links.
What is the differences between pelton turbine and kaplan turbine?
pelton turbines are suited to high head,low flow application but kaplan turbine are used for low head and a large amount of discharge needed. kaplan turbines are expensive to design,manufacture and install as compared to pelton turbine but operate for decades.
What is impulse and reaction blades?
Impulse and reaction blades are two types of turbine blade designs used in steam and gas turbines. Impulse blades convert the thermal energy of steam or gas into mechanical energy by directing the flow onto the blades, causing them to spin. Reaction blades, on the other hand, create lift through the pressure difference generated by the fluid flow over their shape, relying on both the pressure and the velocity of the fluid. Together, these blade types optimize turbine efficiency and performance in energy conversion applications.
What does the turbine do in a generator?
A turbine is a rotary engine that extracts energy from a fluid flow and converts it into useful work.The simplest turbines have one moving part, a rotor assembly, which is a shaft or drum with blades attached. Moving fluid acts on the blades, or the blades react to the flow, so that they move and impart rotational energy to the rotor. Early turbine examples are windmills and water wheelsGas, steam, and water turbines usually have a casing around the blades that contains and controls the working fluid. Credit for invention of the steam turbine is given both to the British Engineer Sir Charles Parsons (1854-1931), for invention of the reaction turbine and to Swedish Engineer Gustaf de Laval (1845-1913), for invention of the impulse turbine. Modern steam turbines frequently employ both reaction and impulse in the same unit, typically varying the degree of reaction and impulse from the blade root to its periphery.A device similar to a turbine but operating in reverse, i.e., driven, is a compressor or pump. The axial compressor in many gas turbine engines is a common example. Here again, both reaction and impulse are employed and again, in modern axial compressors, the degree of reaction and impulse will typically vary from the blade root to its periphery.
What is the difference between impulse and reaction turbine?
In an impulse turbine, the water (or steam) hits the blades and continues almost straight through as in a jet engine. In a reaction turbine, the water hits a semicircular cup and is completely reversed in path, normally dropping down the center with little or no momentum left. These are rarely used with gases because of having to get the output out of the way, but they work especially well with water at lower pressure as when the dam supplying the water is not very high. Both kinds are used in various situations. in impulse turbine steam expanded in nozzle only because blades have equal cross section area.but in case of reaction turbines blades having diverging or converging areas so steam expansion take place not only on nozzles but also on blades. ravi mehrotra srmcem, lucknow
