Does condenser have vacuum to condensate the 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.
How do steam condensers creates vacuum?
Steam when condensed into water reduces in volume drastically at the order of thosands depending upon the pressure existing inside the condenser, e.g. around 14500 times at 0.1 bar. This enormous reduction in volume creates the vacuum inside the condenser.
How is steam condensed in a condenser?
At the top of the condenser, the exhaust steam enters and flows downwards because of the suction of the air extraction pump. When the steam flows in contact with the tubes containing cooling water, the steam condenses, where the heat transfer is conducted by conduction and convection processes.
Why does a condenser need a vacuum?
The removal of air and other noncondensable gases from the condenser shell side is required for proper heat transfer from steam to cooling water in the condenser and, thus, to maintain high vacuum in the condenser.
What happens when a condenser loses its vacuum?
A common cause of poor condenser vacuum is excessive air ingress or leakage. Any fall in condenser vacuum would have consequent rise in turbine heat rate vis-à-vis plant heat rate. As a result, cost of power generation would increase with eventual loss in revenue earning.
What is the effect of high vacuum in condenser?
When a vacuum exists in the condenser, atmospheric air will leak into the condenser shell through flanges and other leakage points raising the condenser pressure. Dissolved gas in the water used to raise the steam will also enter the condenser along with the steam, but will not condense.
What is vacuum condensate?
The vacuum condensate pump serves two principal functions in a steam heating system. To efficiently remove air from the steam lines thus allowing faster heat transfer through the system. To remove condensate which also enables the system to function quickly.
What is the vacuum efficiency of condenser?
Vacuum Efficiency in Condenser. VACUUM EFFICIENCY : It is defined as the ratio of actual vacuum in condenser as recorded by the vacuum gauge to the ideal vacuum. Ideal pressure (pi) is that which corresponds with condensate temperature or with the temperature of steam entering the condenser.
What is a condenser in a steam engine?
A surface condenser or steam condenser is a water-cooled shell and tube heat exchanger used to condensate the exhaust steam from the steam turbine in thermal power stations. The steam is converted from a gaseous to a liquid state at a pressure level below atmospheric pressure.
How does a steam vacuum system work?
They called these old systems “Vapor/Vacuum,” and the principle that made them work was a simple one: At very low pressure,steam takes up about1,700 times more space than water. When that steam condenses, it will create a vacuum if air can’t get back into the system. The old-timers let the steam expand naturally.
How do you calculate vacuum condenser?
Vacuum efficiency = (Actual vacuum in condenser X 100)/Max. Obtainable vacuum. Example-4: The air leakage into the steam condenser is 0.721 kg/min.
What is actual vacuum in condenser?
The actual vacuum in a condenser is equal to barometric pressure + act.
What are the methods of obtaining maximum vacuum in condenser?
There are various methods used for obtaining maximum possible vacuum in the condenser. (1) Air Pump: The air pumps are used to maintain the desired vacuum in the condenser by extracting the air and other non-condensable gases. The air pumps can remove mixture of condensate and non-condensable gases.
How does a vacuum condensate system work?
With the vacuum pump installed on the feed unit, the condensate returns under vacuum directly to the feed tank. It is stored under vacuum until required by the boiler water level control. Finally, note that eliminating your system’s vacuum return pumps will likely increase operating and fuel costs.
What is ideal vacuum in condenser?
Ideal vacuum means the vacuum due to steam alone when air is absent. In that case total pressure in condenser will approach ideal pressure. Vacuum efficiency is also defined as the ratio of the partial pressure of steam to the measured condenser pressure.