How does the steam turbine gland sealing system work?
The gland sealing steam system provides low-pressure steam to the turbine gland in the final sets of labyrinth packing. This assists the labyrinth packing in sealing the turbine to prevent the entrance of air from reducing or destroying the vacuum in the associated condenser.
What is the purpose of sealing steam?
Sealing Steam is used to help in creating vacuum. It seals the narrow gap between the rotating part and stationary part: that’s why its called sealing steam. One part goes inside and outside part is sucked by gland condenser.
How the gland seal steam helped the gland packing in preventing air from entering into the turbine casing?
Turbine Gland Seal To prevent air from entering into the turbine casing, sealing steam is led to the turbine glands. The sealing steam first passes through the throttle steam valve and then the safety orifice in order to reduce its pressure to 0.01~0.08MPaG before reaching the turbine glands.
What is GVC in steam turbine?
Get Latest Price. Gland vent condensers are used for the condensation of gland vent steam and main steam after expansion in turbines. The gland vent condenser is provided with centrifugal blowers to force the air out after steam is condensed.
Why vacuum is required in steam turbine?
Vacuum applies to steam turbines because the pressure of saturated vapour above available cooling water is well below 1 bar (typically 17 mbar at 15°C ambient). These shortcomings are examined and used to explain the anomalous response of a turbine to a copious supply of cold winter cooling water.
Why gland steam is used in turbine?
gland steam providing a seal between turbine shaft and turbine casing . so gland steam protect the leakage of steam outside of the turbine and also and suck the ambient air inside . So it is required to seal the portion to prevent leakage of steam and atmospheric air ingress.
How vacuum is created in turbine?
After the steam leaves the exhaust section, it enters a condenser, where it is cooled to a liquid state. The process of condensing the steam usually creates a vacuum, which then brings in more steam from the steam turbine. The water is returned to the steam generation system, reheated and reused.
What material is used in turbine glands?
To date, nobody has discovered, produced or invented a material for turbine glands that can better carbon. For this reason, carbon is widely employed in this capacity, except in one or two countries like Italy and the U.S.A. where soft packing glands arc preferred.
What is steam chest in turbine?
Steam chest: The steam chest, located on the forward, upper half of the HP turbine casing, houses the throttle valve assembly. This is the area of the turbine where main steam first enters the main engine. The throttle valve assembly regulates the amount of steam entering the turbine.
What are four types of turbines?
While turbines can be classed as either impulse or reaction according to the way they function, there are four broad types of turbines categorized according to the fluid that supplies the driving force: steam, gas, water, or wind.
Where is steam turbine used?
Steam turbines are used extensively in both large and small power plants to generate electrical power. Coal-fired, gas-fired, nuclear, and biomass fuels can be used to generate steam for steam turbine plants.
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 are the two types of steam?
Types of Steam
- Pressure-Temperature Relationship of Water & Steam.
- Saturated Steam (Dry)
- Unsaturated Steam (Wet)
- Superheated Steam.
- Supercritical Water.
- Various States of Water.
What are the two types of turbines?
There are two main types of hydro turbines: impulse and reaction. The type of hydropower turbine 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. Other deciding factors include how deep the turbine must be set, efficiency, and cost.
What is the principle of steam turbine?
In simple terms, a steam turbine works by using a heat source (gas, coal, nuclear, solar) to heat water to extremely high temperatures until it is converted into steam. As that steam flows past a turbine’s spinning blades, the steam expands and cools.
What are the main parts of steam turbine?
The main parts of a steam turbine are (1) the rotor that carries the blading to convert the thermal energy of the steam into the rotary motion of the shaft, (2) the casing, inside of which the rotor turns, that serves as a pressure vessel for containing the steam (it also accommodates fixed nozzle passages or stator …
What is difference between impulse and reaction turbine?
In impulse turbine the steam flows through the nozzle and strikes on the moving blades. But in the reaction turbine, the steam which glides over the moving blades possesses both pressure and kinetic energy. In impulse turbine the pressure of steam remains constant during its flow through the moving blades.
What is steam turbine and its types?
Multistage Impulse and Reaction turbines: They are made in a wide range of power capacities varying from small to large. According to the type of steam flow: Axial turbines: In these turbines, steam flows in a direction parallel to the axis of the turbine rotor.
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.
What is the function of turbine?
A turbine is a device that harnesses the kinetic energy of some fluid – such as water, steam, air, or combustion gases – and turns this into the rotational motion of the device itself. These devices are generally used in electrical generation, engines, and propulsion systems and are classified as a type of engine.