Tandem compound or cross compound The rotor arrangement can be either tandem-compound in which the two axles are joined end to end, or cross-compound in which the two turbines have separate axles. In the cross-compound case two separate generators are usually supplied, although a gearbox can reduce this to one.
What is meant by compounding of steam turbine?
Compounding of steam turbines is the strategies in which energy from the steam is extracted in a number of stages rather than a single stage in a turbine.
What are the types of compounding of steam turbine?
- Velocity Compounding.
- Pressure Compounding.
- Pressure Velocity Compounding.
- Advantages velocity compounded steam turbine:
- Disdvantages velocity compounded steam turbine:
What are the 2 types of steam turbines?
Two types of steam turbines must be considered, condensing and noncondensing.What is double casing turbine?
Double casing turbines have the exhaust steam circulating in the annular space between the casings as in the case of the high pressure turbine and have provision for the extraction of some partly expanded steam for feedwater heating. The channels for this steam are in the annular spaces surrounding the inner casing.
How is compounding done in steam turbine?
Compounding of steam turbine is used to reduce the rotor speed. It is the process by which rotor speed come to its desired value. A multiple system of rotors are connected in series keyed to a common shaft and the steam pressure or velocity is absorbed in stages as it flows over the blades.
What is back pressure steam turbine?
Back Pressure Turbines: a type of steam turbine that is used in connection with industrial processes where there is a need for low or medium pressure steam. The high pressure steam enters the back pressure steam turbine and while the steam expands – part of its thermal energy is converted into mechanical energy.
What is compounding of impulse turbine?
Compounding is done to reduce the rotational speed of the impulse turbine to practical limits. Compounding is achieved by using more than one set of nozzles, blades, rotors, in a series, keyed to a common shaft; so that either the steam pressure or the jet velocity is absorbed by the turbine in stages.What is nozzle in steam turbine?
A steam nozzle is a duct or passage of smoothly varying cross sectional area which converts heat energy of steam into kinetic energy. The shape of the nozzle is designed such that it will perform this conversion of energy with minimum loss.
What are the five types of steam turbine?While based on the flow of steam they can be classified as a single flow, double flow and reverse flow turbines. Similarly, based on exhaust conditions, there are five main types of steam turbines; condensing, non-condensing, automatic extraction, mixed pressure, and regenerative extraction.
Article first time published onWhat is Curtis turbine?
The Curtis turbine is a compound impulse turbine, the com- pounding being both for pressure and velocity. … This is done by compounding the pressure drop, that is, by using several sets of nozzles, thereby reducing the drop in each set, and reducing the exit velocity of the steam accord- ingly.
What is impulse turbine?
Impulse turbines are defined as turbines in which high-velocity jets of water or steam collide with the blades of the turbine to rotates the turbine and produce electricity using this winding. The impulse turbine is so named because it acts on the impulse force created for the striking blade of the water jet.
What are the types of compounding?
- Compound Adjective.
- Compound Adverb.
- Compound Noun.
- Compound Tense.
- Compound Verb.
- Exocentric Compound.
- Rhyming Compound.
- Root Compound and Synthetic Compound.
What is velocity compounding of steam turbine?
Compounding of steam turbines is the method in which energy from the steam is extracted in several stages rather than a single stage in a turbine. In all turbines, the rotating blade velocity is proportional to the steam velocity passing over the blade.
What is meant by pressure compounding?
Pressure compounding is the method in which pressure in a steam turbine is made to drop in a number of stages rather than in a single nozzle. This method of compounding is used in Rateau and Zoelly turbines.
Why double casing is used in steam turbine?
With a double-shell casing, the space between the shells is filled with steam at exhaust conditions, allowing each casing to be designed for smaller temperature and pressure differentials. … It also permits simple bled-steam tapping at the inter-shell conditions and reduces the net thrust on the HP rotor.
Why casing is used in turbine?
The present invention provides a turbine casing which allows that part of the casing which forms the outer wall of the main flow duct to remain reasonably concentric and hence enables control of the leakage past the turbine rotor tips.
What is the use of casing in turbine?
A pressure casement is needed to contain the working fluid as it acts on the turbine stage(s) or the turbine must be fully immersed in the fluid flow (such as with wind turbines). The casing contains and directs the working fluid and, for water turbines, maintains the suction imparted by the draft tube.
What is a topping turbine?
Topping turbines receive high-pressure steam from new high-pressure boilers. The exhaust steam of the new turbine has the same pressure as the old boilers and is used to supply the old turbines.
What is nozzle Mcq?
Explanation: Nozzles are used to control the rate, speed, direction of flow.
What is extraction turbine?
Definition of extraction turbine : a steam turbine provided with taps through which steam may be drawn off at various stages for purposes (such as heating) other than driving the turbine.
Why is compounding done?
This may be done for medical reasons, such as administration in a different format (ex: tablet to liquid), to avoid a non-active ingredient the patient is allergic to, or to provide an exact dose that isn’t commercially available. Medically necessary compounding is referred to as “traditional” compounding.
What is the benefit of compounding?
Compound interest makes your money grow faster because interest is calculated on the accumulated interest over time as well as on your original principal. Compounding can create a snowball effect, as the original investments plus the income earned from those investments grow together.
How many stages are there in steam turbine?
Pressure-staged turbines can range in power capacity from a few to more than 1.3 million kilowatts. Some manufacturers prefer to build units with impulse stages simply to reduce thrust-bearing loads. Such units may have as many as 20 sequential stages.
What is nozzle and types?
Types of Nozzles: It is used in a case where the backpressure is equal to or greater than the critical pressure ratio. Divergent Nozzle: The cross-sectional area of the divergent nozzle increases continuously from its entrance to exit.
What is Wilson line?
Explanation: Wilson line is the locus of points at which the limit of undercooling is reached and the condensation commences. At this state the normal conditions of thermal equilibrium are also restored. Wilson line is not conventionally shown in a Mollier chart.
What are different types of nozzles?
- Nozzle.
- The Nozzle Tip is one of the most important and least expensive part of a spraying system. Adjustable nozzle.
- Double swirl spray nozzle.
- Selecting a spray nozzle.
- Hollow cone nozzles-Disc and core type.
- Flat fan nozzles.
- Floodjet nozzles.
- Adjustable nozzles.
Which type of compounding is used in impulse turbine?
Compounding. Compounding is the splitting up, into two or more stages, of the steam pressure or velocity change through a turbine. Pressure compounding of an impulse turbine is the use of a number of stages of nozzle and blade to reduce progressively the steam pressure.
What is pressure compounding and velocity compounding?
Pressure-velocity compounding is a combination of the above two types of compounding. In fact, a series of velocity-compounded impulse stages is called a pressure-velocity compounded turbine. Each stage consists of rings of fixed and moving blades.
Which of these is a type of compounding in an impulse turbine?
In the compounding method, the steam jet velocity or the steam pressure is absorbed in stages as it flows over the rotor blades. When “steam velocity” is absorbed in stages, it is called “Velocity compound impulse turbine”. When “steam pressure” is absorbed in stages it is known as “pressure compound impulse turbine”.
What is chest pressure in steam turbine?
It depends on what pressure the turbine is designed to run on. I have seen some large turbines run at about 600 psi at the steam chest. Chamber pressure drops off once the steam leaves the nozzle block and keeps dropping as it passes the buckets.
