jet condenser and surface condenser pdf

Jet condenser and surface condenser pdf

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Steam Condenser: Types, Working, Advantages and Disadvantages

Surface Condenser

Surface Condenser | Difference Between Jet Condenser and Surface Condenser

Generally, every large-scale industry consists of a power plant like a heat engine.

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.

Steam Condenser: Types, Working, Advantages and Disadvantages

Surface condenser is the commonly used term for a water -cooled shell and tube heat exchanger installed on the exhaust steam from the steam turbines that drive the electrical generators in thermal power plants. In thermal power plants, the primary purpose of a surface condenser is to condense the exhaust steam from a steam turbine at as low a pressure as possible and to obtain pure water referred to as steam condensate so that it may be reused in the steam generator or boiler as boiler feed water. The steam turbine itself is a device to convert the heat in steam to mechanical work. The difference between the enthalpy of the inlet steam to a turbine and the enthalpy of the exhaust steam represents the heat which is converted to mechanical work. Therefore, the larger the enthalpy difference between inlet steam and exhaust steam, the higher is the amount of work delivered by the turbine. Condensing the exhaust steam of a turbine at a pressure below atmospheric pressure, increases that enthalpy difference and therefore increases the work output of turbine. The water-cooled surface condensers used on the steam turbine exhausts in large power plants usually operate at an absolute pressure of about 35 to 40 mmHg which is far below the typical atmospheric pressure of mmHg.

Surface Condenser

In sugar Industry Condensers and cooling systems are used in boiling process to create vacuum in pans and evaporators. The principle of condenser is based on the transmission of heat content in the vapour to the cooling or injection water. The quantity of the cooling water necessary for condensation of vapour is found by equating the heat given up by the vapour in condensing to the heat absorbed by the cold water. The steam condensers may be broadly classified into the following two types, depending upon the way in which the steam is condensed. Direct Contact condenser or Jet condenser or Mixing type condenser 2. Surface condensers or non-mixing type condensers. Direct contact condensers are commonly used for condensing the vapour in evaporators and vacuum pans.

Surface Condenser | Difference Between Jet Condenser and Surface Condenser

The surface condenser is designed to condense and deaerate the exhaust steam from the main turbine and provide a heat sink for the turbine bypass system. In surface condensers, there is no direct contact between the exhaust steam and the cooling water. The exhausted steam from the LP turbines is condensed by passing over tubes containing water from the cooling system. The steam condenses when it comes in contact with the cold surface of the tubes and due to the heat transfer to cooling water by conduction and convection.

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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 gaseous to liquid state at a pressure level below atmospheric pressure. The condensate can be re-used in the boiler: In surface condenser even impure water can be used for cooling purpose whereas in jet condensers cooling water must be pure. Although the capital cost and the space required is more in surface condensers but it is still preferred due to its low running cost and high thermal efficiency of plant. Surface condensers can be classified into varies types depending upon the position of condensate extraction pump, flow of condensate and arrangement of tubes.

1 comments

  • Astolpho T. 08.06.2021 at 23:07

    a surface condenser is used and the supply of water is limited. Types of condensers. The steam condensers are classified as follows: 1. Jet.

    Reply

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