Table of Contents
What material is used in turbine casing?
A material used for the casing is 1Cr-1Mo-1/4V low carbon alloy cast steel or 11Cr-1Mo-V-Nb-N cast steel. From the standpoint of exhaustion of fossil fuel such as petroleum, coal and so on and energy saving, it is required to improve the efficiency of a thermal power plant.
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.
What are the parts of a turbine?
The turbine components to be installed are the tower, nacelle, hub and blades.
What is material selection of steam turbine?
13.3. 2. Material selection
Component | Material | Nearest ASTM equivalent |
---|---|---|
Inner casing | 12CrNiMo | None |
Stationary blades | Nodular cast iron | A536 60-40-18 |
12CrNiMo | None | |
12CrNi | A240 410 |
How are turbine casings made?
A method for producing a turbine casing for a rotating machine is provided. The casing is manufactured by a casting process, and is cast in two casing halves which are separated by a parting plane which passes axially through the turbine casing.
What is the material used for turbine diaphragm?
At the start of the steam turbomachinery era, diaphragms were mostly made by casting, using cast iron for the outer and inner rings and stainless steel vanes. However, these diaphragms had very low mechanical strength, temperature limits and inaccurate steam passing area.
What is casing in turbomachines?
It gives a unique direction to the fluid used. Steam turbines consist essentially of a casing to which stationary blades are fixed on the inside and a rotor carrying moving blades on the periphery. The rotor is fitted inside the casing with the rows of moving blades penetrating between the rows of fixed blades.
What are the three stages of turbine?
In modern turbines, three types of staging are employed, either separately or in combination: (1) pressure (or impulse) staging, (2) reaction staging, and (3) velocity-compound staging.
What are the five parts of a turbine?
A wind turbine consists of five major and many auxiliary parts. The major parts are the tower, rotor, nacelle, generator, and foundation or base. Without all of these, a wind turbine cannot function. The foundation is under the ground for the onshore turbines; it cannot be seen because it is covered by soil.
What is turbines and its types?
Turbines used in hydroelectric power plants fall into two categories: Impulse and Reaction based. Impulse based turbines include Pelton and cross-flow turbines. Reaction based turbines include three subtypes: Francis turbine, propeller turbine (bulb turbine, Straflo turbine, Kaplan turbine types), and kinetic turbine.