What is an Air Preheater?Explain its working applications,types and advantages

What is an Air Preheater?Explain its working applications,types and advantages?  Air preheaters are classified as any kind of device that is used to heat the air to a certain temperature. The heated air is then then utilized as a primary source of energy to increase the thermal efficiency of the following process. Air-preheaters are placed at the beginning of the process and are used individually or to replace heat-exchangers already in place.

 How does an Air-Preheater works?  Air Preheaters are designed on the basis of the kind of medium and the temperature required for the application. A small sized preheater is designed in such a way that more heating takes place in a smaller case. This is achieved by arranging a group of smooth surfaced tubes through which the media can flow through.

However, it is found out that Air-Preheaters function in a more efficient way when a number of them are used collectively. Depending on the type of flow in the pre-heater, the design of the pre-heater will change. Usually a standard pre-heater will have counter flow, co-current flow, co-current flow-counter current or cross-counter current or cross-co-current flow type media.  What are the different types of Air-Preheater?  On the basic level there are two types of Air-Preheaters namely,  Tubular or Recuperative Type  Feed Water or Regenerative Type 1.

Tubular Type Air-Preheater Tubular preheaters are preferred in smaller and medium sized boilers. Here the construction of the preheater restricts the flow of the media to be carried in tube shaped walls. The media is separated by these tubes and the air to be heated is passed through these tubes by force.

The heat exchange takes place between the heated media and the air after which the air is carried out for its further process.

2. Feed Water Type Air-Preheater A feed water preheater has a stationary rotating hood. The heat exchange between air and the media takes place by alternate heating and cooling of the ceramic or metallic plates which rotate continuously.

 What are the advantages of using an Air-Preheater?  From pre-heating the air to be it far more effective an air-heater has several other advantages. These include increasing the thermal efficiency of the entire system, improving the strength of the combustion chamber (If used in IC engines) and easy use with all types of fuels and can easily be fitted in most existing systems.  What are the applications of an Air-Preheater?  Industrial steam boilers  Industrial drying processes  Refinery & petro chemical furnaces  Incinerators http://www.maniks.com/manufacturer/air-preheater/

 What is an adiabatic cooling system?  Adiabatic cooling is the process of reducing the temperature of a process through a change in air pressure caused by volume expansion. The use of adiabatic process enables free cooling methods which can be used freely as they are available in a natural phenomenon to regulate temperature.  What is a Desuperheater Water heater and what are its applications?  A Desuperheater is a device which has the capability to transfer heat to or from the ground, which can be later utilized for any purpose. It uses the earth all the time without the need of any heat source (Usually in the winter) or a heat sink (In the summers). This process takes advantage of the moderate temperatures in the ground for boosting efficiency and reducing the operational costs of heating and cooling systems which when combined with solar heating form a geosolar system with even a greater efficiency. A Desuperheater can have a variety of uses from heating the in your storage to other household related applications.  What is the desuperheating theory?  Superheated steam is a steam which is at a temperature higher than the saturation temperature for the steam pressure. If further heated is added to this batch of steam, then the steam will,  Will be at a higher temperature then the saturation temperature  Contain more energy than the saturated steam  Has a greater specific volume than the saturated steam The relationship between these three properties is referred to as the desuperheating theory.  How are the desuperheaters installed?  The total installed length of a desuperheated will vary in size and length but is typically about 7.5m. Depending on the type of flow, desuperheaters should be installed in the opposite direction, i.e – if the flow is upwards then the desuperheater should be installed vertically.  What are the different types of desuperheaters?  Here are some types of desuperheaters that are used more commonly,  Venturi type desuperheater  Steam atomising desuperheater  Variable Orifice desuperheater  Combined pressure control valve superheater

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What are some applications of superheaters?

Power generation Process controllability Thin pipes and lighter flanges Prevents lubrication degradation

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