Air Preheater - Hot Air Generator Manufacturer - PowerPoint PPT Presentation

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Air Preheater - Hot Air Generator Manufacturer

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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. – PowerPoint PPT presentation

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Title: Air Preheater - Hot Air Generator Manufacturer


1
Air Preheater - Hot Air Generator Manufacturer
2
Index
  • What is Air preheater
  • Working applications of air preheater
  • Types of air preheaters
  • Advantages of air preheaters

3
Air Preheater
4
Air preheaters
  • 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.

5
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.

6
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

7
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.

8
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.
  •  

9
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

10
  • 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.

11
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.

12
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.

13
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.

14
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

15
What are some applications of superheaters
  • Power generation
  • Process controllability
  • Thin pipes and lighter flanges
  • Prevents lubrication degradation
  • Visit ushttp//maniks.com/
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