What is the difference between a GT(gas turbine), a ST(steam turbine), a WT or HT(water turbine/Hydro turbine)
Turbine/Prime mover:-
Turbine is a class of turbo machinery used to convert the energy in a flowing fluid into mechanical energy by the use of rotor mechanisms. Turbines, in general, convert either thermal or kinetic energy of the fluid into work.
Gas Turbine:
Gas turbine engine or simply a gas turbine is an internal combustion engine, using Natural gas(Methane) CH4 as the working fluid help with Air.
Gas turbine engine, unlike the steam turbine, consists of several key components; those are the compressor, combustion chamber, and turbine, which are assembled along a rotating shaft, to perform different tasks of an internal combustion engine.
Gas turbines can be used to produce torque, thrust (which powers the military fighter aircraft), or both in combination (used in turboprop engines).
Gas turbines are more versatile, because many flammable gas fuels can be used as working fluid. Steam turbines, on the other hand, require large amounts of water for the operation and tend to cause problems in lower temperatures due to icing.
They are preferred over other engines (mainly reciprocating engines) due to their high power to weight ratio, less vibration, high operation speeds, and reliability.
Steam Turbine:
The steam turbine uses pressurized steam from a boiler as the working fluid.
The super-heated steam entering the turbine loses its pressure (enthalpy) moving through the blades of the rotors, and the rotors move the shaft to which they are connected.
Steam turbines deliver power at a smooth, constant rate, and the thermal efficiency of a steam turbine is higher than that of a reciprocating engine but lower than gas turbine engines due to higher operating temperatures of the gas turbines (Gas turbines ~1500°C and steam turbines ~550°C).
In modern days, primary use of the steam turbines is for the electrical power generation, but at the early 20th century steam turbines was used as the power plant for ships and locomotive engines. As an exception, in some marine propulsion systems where the diesel engines are impractical, such as aircraft carriers and submarines, the steam engines are still used.
Water turbine/Hydro turbine:-
A water turbine is a rotary engine that takes energy from moving water. Now they are mostly used for electric power generation.
The type of water turbine or hydro-power selected for a project is based on the height of standing water (referred to as head) and the flow, or volume of water, at the site, and there are a number of different hydro-power turbine types available that are suited to different heads and flows.
No comments:
Post a Comment