Table of Contents
- 1 Why is it necessary to maintain a below atmospheric pressure in a condenser?
- 2 Why do we maintain vacuum in condenser?
- 3 What determines the lowest pressure that can be maintained at the condenser?
- 4 What is pressure in condenser?
- 5 Does the exit pressure of steam from turbine at the inlet of condenser depend on condenser cooling water temperature?
- 6 What is the pressure in condenser?
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 do we maintain vacuum in condenser?
In other words, the specific volume of water at a given pressure is many times lower than that of steam. A vacuum is maintained in the condenser so that steam can easily flow and more work can be extracted from the steam in the turbine; this is the reason why vacuum is maintained in condensers.
Why boiler is maintained at negative pressure?
Maintaining furnace pressure NEGATIVE is essential so that air from the boiler building/atmosphere leaks into the flue gas ducting and boiler setting, referred to as “tramp air”, instead of flue gas leaking out of the boiler and ducting into the spaces occupied by personnel and equipment.
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 determines the lowest pressure that can be maintained at the condenser?
The condenser pressure is dictated by two factors, either of which may be limiting: The condenser performance, which is a function of the thermal duty (amount of steam that must be condensed) and the cooling water flow rate and temperature.
What is pressure in condenser?
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. Subcooling: A liquid at a temperature below its saturation temperature for a given pressure.
What is the pressure inside condenser?
As a typical condenser pressure might be around 0.1 bar,a, and a typical ejector compression ratio may be 3:1 to 4:1, it generally takes two to three stages of compression to exhaust to atmospheric pressure, about 1 bar,a.
How do I maintain negative pressure in my boiler?
Negative pressure -When the pressure in combustion area of the boiler is less than atmospheric pressure. This is achieved in balanced draft boilers by using Forced draft fans to force air into boiler (pressuring it)and Induced draft fans to remove air from the boilers to create negative 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. The main reason is when the condenser pressure is high, the turbine is exit enthalpy is high and the specific turbine power output is low.