What is Curtis turbine?

The Curtis turbine is a compound impulse turbine, the com- pounding being both for pressure and velocity. In an impulse turbine, the internal energy of the steam is first changed into velocity, by expansion in a suitable nozzle, and the jet of steam directed against the moving blades.

What is a multi stage steam turbine?

a gas or steam turbine in which the expansion of the steam or gas from its initial pressure to its final pressure and the conversion of its thermal energy into mechanical work takes place in a number of stages arranged in tandem, rather than in one stage.

What is meant by pressure compounding in a turbine?

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.

What is impulse steam turbine?

An impulse turbine has fixed nozzles that orient the steam flow into high speed jets. These jets contain significant kinetic energy, which is converted into shaft rotation by the bucket-like shaped rotor blades, as the steam jet changes direction.

Why multi stage turbine is used?

NON CONDENSING or BACK PRESSURE allow further use of the energy in the exhaust steam for process heat or other services. For higher power applications, Elliott multi-valve, multi- stage designs provide the highest levels of efficiency as well as accurate control of speed and steam flow.

How many types of steam turbines are there?

In order to match steam production to heat demand, there are three types of steam turbine in common use for CHP plants. These three are called a back pressure steam turbine, an extraction steam turbine and a condensing steam turbine. Each type will suit a different configuration of plant.

What is the difference between pressure compounding and velocity compounding?

Difference between velocity compounding and pressure compounding are: Pressure of the steam remains constant in every fixed blade and moving blades except in the first nozzle in velocity compounding whereas in pressure compounding turbine pressure of steam increase in every nozzle.

Why is compounding necessary in 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 are the 2 types of steam turbine?

1 Steam turbine cogeneration systems. The two types of steam turbines most widely used are the backpressure and the extraction-condensing types (Fig. 19.3). The choice between backpressure turbine and extraction-condensing turbine depends mainly on the quantities of power and heat, quality of heat, and economic factors …