What is tandem compounding?
Tandem compound or cross compound The rotor arrangement can be either tandem-compound in which the two axles are joined end to end, or cross-compound in which the two turbines have separate axles. In the cross-compound case two separate generators are usually supplied, although a gearbox can reduce this to one.
What are the 2 types of steam turbines?
Two types of steam turbines must be considered, condensing and noncondensing.
What is cross compounding of steam turbine?
Compounding is the splitting up, into two or more stages, of the steam pressure or velocity change through a turbine. The term ‘cross-compound’ is used to describe a steam turbine unit made up of a high pressure and a low pressure turbine . …
What are the types of steam turbine?
The following types of steam turbines are available for private/thermal power generation plants.
- Small/Mid-sized Condensing Turbines.
- Extraction-condensing Turbines.
- Extraction Back-pressure Turbines.
- Mixed-pressure Turbines.
- Geared Turbines.
What is double casing 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. A baffle is formed between the two casings near the exhaust end as part of the inner-casing casting.
What is double flow turbine?
In a double flow rotor, the blades in each half face opposite ways, so that the axial forces negate each other but the tangential forces act together. This design of rotor is also called two-flow, double-axial-flow, or double-exhaust. This arrangement is common in low-pressure casings of a compound turbine.
What is Cross compound?
Definition of cross-compound of a compound engine. : having cylinders side by side.
What are the two types of turbines?
There are two main types of hydropower turbines: reaction and impulse. 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 over time, at the site.
What is a high pressure turbine?
High pressure turbine: The high pressure (HP) turbine (see Figure 1) is the first main engine turbine to receive steam from the main steam system. It is designed to efficiently extract work out of high pressure steam. The HP turbine is a pressure-velocity compounded, single axial flow, non-condensing impulse turbine.
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.
