Table of Contents
- 1 Why is it necessary to maintain a below atmospheric pressure in a condenser?
- 2 What is the effect of lowering the condenser pressure on cycle efficiency?
- 3 What is the pressure in the condenser of steam power plant?
- 4 What is condenser pressure?
- 5 How does a condenser operate?
- 6 Why is the pressure in the condenser of a steam turbine low?
- 7 What is the function of condensers in wind turbines?
Why is it necessary to maintain a below atmospheric pressure in a condenser?
While lowering the working pressure of a condenser do have many benefits like; faster condensation, better heat exchange, avoid air to get dissolved in water and increased overall efficiency of the unit.
Why exit pressure of steam from the turbine at the inlet of condenser is kept below atmospheric pressure in steam power plants?
It’s because the work produced is a function of the pressure ratio through the turbine. The lower you make the outlet pressure, the higher the pressure ratio. When you divide by small numbers, the ratio gets really big. Condensers cool the steam to as low a temperature as practical using river water or a cooling tower.
What is the effect of lowering the condenser pressure on cycle efficiency?
The overall effect of lowering the condenser pressure is an increase in the thermal efficiency of the cycle. The average temperature at which heat is added to the steam can be increased without increasing the boiler pressure by superheating the steam to high temperatures.
Is condenser pressure lower than atmospheric pressure?
Detailed Solution. Concept: In a condensing turbine, the pressure in the last stage of the turbine is less than atmospheric pressure, and the condensing turbines are characterized by high-pressure ratios.
What is the pressure in the condenser of steam power plant?
Typically the cooling water causes the steam to condense at a temperature of about 25 °C (77 °F) and that creates an absolute pressure in the condenser of about 2–7 kPa (0.59–2.07 inHg), i.e. around −95 kPa (−28 inHg) below atmospheric pressure.
Does the exit pressure of steam from turbine at the inlet of condenser depend on condenser cooling water temperature?
The steam load on the condenser depends on its pressure for a given cooling water inlet temperature. As indicated in Figure 5 as the condenser pressure increases the steam entering to the condenser increases.
What is condenser pressure?
Condensing pressure: The pressure at which the refrigerant is phase changing from a vapor to a liquid. Evaporating pressure: The pressure at which the refrigerant is phase changing from a liquid to a vapor.
What is the pressure in the condenser of a steam power plant?
How does a condenser operate?
All condensers operate by removing heat from the gas or vapour; once sufficient heat is eliminated, liquefaction occurs. For some applications, all that is necessary is to pass the gas through a long tube (usually arranged in a coil or other compact shape) to permit heat to escape into the surrounding air.
What is the function of condenser in steam power plant?
A steam condenser is a closed vessel in which steam is condensed by abstracting the heat by cooling it with water and where the pressure is maintained below atmospheric pressure. The condensed steam is known as condensate. The efficiency of the steam power plant is increased by the use of a condenser.
Why is the pressure in the condenser of a steam turbine low?
In the condenser pressure is low because It helps to suck the steam from the turbine exhaust, The steam comes out from turbine exhaust in the vapor form . Low pressure in condenser helps to suck it effectively Avoids the back pressure on the turbine Rate of steam flow in condenser increases.
What happens if condenser is not used in power plant?
If condensor is not used in the powerplant then the max temp uptowhich steam could expand is 100°C i.e. Saturation temp at atm pressure By using the condenser steam can expand upto 30–40°C and efficiency of rankine cycle is increase with decrease in heat sink temprature.
What is the function of condensers in wind turbines?
The exhaust steam from the low pressure turbine enters the shell where it is cooled and converted to condensate (water) by flowing over the tubes. Such condensers use steam ejectors or rotary motor-driven exhausters for continuous removal of air and gases from the steam side to maintain vacuum.