Title: What is an Air Preheater?Explain its working applications,types and advantages
1What is an Air Preheater?Explain its working
applications,types and advantages
2Index
- What is Air preheater
- Working applications of air preheater
- Types of air preheaters
- Advantages of air preheaters
3Air Preheater
4Air 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.
5How 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.
6What 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
7Tubular 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.
8Feed 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. -
9What 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
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- 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.
11What 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.
12What 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.
13How 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.
14What 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
15What are some applications of superheaters
- Power generation
- Process controllability
- Thin pipes and lighter flanges
- Prevents lubrication degradation
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