What is Casing in steam turbine?
What is Casing in steam turbine?
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 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.
What is the purpose of providing casing in turbine?
Early turbine examples are windmills and waterwheels. Gas, steam, and water turbines have a casing around the blades that contains and controls the working fluid.
What is the function of steam turbine?
The steam turbine generator is the primary power conversion component of the power plant. The function of the steam turbine generator is to convert the thermal energy of the steam from the steam generator to electrical energy.
How are steam turbines classified?
Steam turbines can be classified in a number of ways [2]. They can be classified by cycle and steam conditions, such as Rankine cycle, Rankine regenerative cycle, reheat cycle, condensing or noncondensing, and by the number and arrangement of turbine shaft shafts and casings.
What are the different types of steam turbines?
Steam Turbines. Three basic types of steam turbine are used to generate power as a by-product of process or exhaust steamml: condensing, pass-out condensing, and back-pressure.
Which type of material is used for casing?
Casing is typically made from carbon steel, but as the primary structural component of the well the grade of steel used to make the casing, and the specifications of the finished material, are very important.
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.
Which is an example of impulse turbine?
Artwork: A Pelton water wheel is an example of an impulse turbine. It spins as one or more high-pressure water jets (blue), controlled by a valve (green), fire into the buckets around the edge of the wheel (red).
Is steam turbine an engine?
The steam turbine is a form of heat engine that derives much of its improvement in thermodynamic efficiency from the use of multiple stages in the expansion of the steam, which results in a closer approach to the ideal reversible expansion process.
What are 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.
How is high pressure casing used in steam turbines?
High pressure casing of a steam turbine is meshed with Hexa mesh to obtain accurate results. 3D casing model is taken up for contact pressure and structural analysis. By carrying out the contact pressure analysis it will be taken care that required contact pressure is maintained at the parting plane and thus no steam leaks out of the casing.
How is the validation of a steam turbine done?
The validation is done by taking into consideration a single stage (1st stage) and applying the boundary conditions using Altair Hyperworks. High pressure casing of a steam turbine is meshed with Hexa mesh to obtain accurate results. 3D casing model is taken up for contact pressure and structural analysis.
Where does steam go in a steam turbine?
On leaving the boiler reheater, steam enters the intermediate pressure turbine at 5650 C and 40.2 bar pressure. From here the steam goes straight to the section of Low pressure Steam turbine expanding itself with increase in mass flow. From the intermediate pressure turbine, the steam continues its expansion in the three Low pressure turbines.
How is sensitivity analysis used in steam turbine design?
Custom made methodology is developed to achieve the structural integrity of the casing, with the accomplishment of simulation engineering. Sensitivity analysis is made possible with the aid of modern computers which allows the user to explore the criticality in the core design.