airpreheater introduction working types applications n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Airpreheater – Introduction, Working, Types, Applications PowerPoint Presentation
Download Presentation
Airpreheater – Introduction, Working, Types, Applications

Loading in 2 Seconds...

play fullscreen
1 / 10

Airpreheater – Introduction, Working, Types, Applications - PowerPoint PPT Presentation


  • 8 Views
  • Uploaded on

What is Airpreheater? \nA very basic word to word meaning is a device used to heat the air before processing it to further use. They are also recognized as air heaters or air-heating pipe. It is designed to work to exchange heat energy with desuperheaters. Desuperheater is a Device which is been used to reduce the temperature of the steam in a high heat generation plants where large amount of heat energy or steam is released in the atmosphere. \n \nWorking\nAirpreheater can be performed by fashion counter flow, co-current flow, co-current flow-countercurrent or cross-countercurrent or cross-co-current flow. The design of the device is depend on the media and the temperature conditions of the application. For small construction, finned tubes are suited to arrange in a small space much heating surface. Is in the exhaust gas or in the air containing dust or other particles, so that deposits are expected, preferably smooth tubes are used, which are less prone to deposits and will be clean easier.\nIn most of the applications, an Airpreheater is performed in several stages that mean, it consists of several individual heat exchangers connected in series on the air side.\nAs they are heating the air passing through it by means of wasted heat energy airpreheateras are used in various areas such as boilers, industrial furnace units and in hot-air ventilation systems. They are designed depending on the applications where they are going to be used.\nTypes of Airpreheater\nAccording to the working principle airpreheaters are divided into two types\n• Recuperative or tubular type \n• Regenerative or feed water type\nLet’s discuss one by one type in brief\n\n1. Recuperative or Tubular Type \nRecuperative type of airpreheaters is preferably used in small and medium size boilers. In this type heat energy exchange is carried out through the walls of heating surface that separate the heat energy carrier and air to be heated. \nAmbient air is forced by a fan through ducting at one end of the preheater tube and at other end the heated air from inside the tubes emerges into another set of ducting Tubular preheaters consist of straight tube bundles which pass through the outlet ducting of the boiler and open at each end outside of the ducting. The hot furnace gases pass around the preheater tubes inside the ducting which transfers that carries it to the furnace of a boiler for combustion.\n2. Regenerative or Feed Water Type \nIn feed water airpreheaters exchange of heat energy takes place through alternate heating and cooling of metallic or ceramic nozzles of the fixed or rotating heating surfaces. Regenerative air preheaters are compact and can have stationary rotating hood. \nTypes of Regenerative \nRotating-plate Regenerative \n\nThe rotating-plate design consists of a central rotating-plate element which is installed within a \nbi-sector type- with Single Gas and Air Stream \n tri-sector type- with Single Gas Stream but two air streams \n or quad-sector type sectors which contain seals around that element.\nStationary-plate Regenerative \n\nIn this type the heating plate elements of regenerative air preheater are installed in a casing, but the heating plate elements should be stationary. Instead the air ducts in the preheater are rotated so as to alternatively parts of the heating plate elements to the up filling cool air.\n\nCombine Use of Recuperative and Regenerative Type\nThe combination of tubular and regenerative type is used in the applications where very high capacity boilers are required. In such a type of combination the tubular type being used as a primary air heating and regenerative preheater is used for the secondary air heating purpose. If in case the designers of boiler don’t want to use the combination of recuperative and regenerative type of Airpreheater, then they can go for tri-sector regenerative air heater. \n\nAdvantages of AirPreheater\nIt is used to heat the air before it is used for further application. For heating the air it uses heat energy of flue gases hence there are many more advantages of Airpreheaters over the normal preheaters such as \n• Increases thermal efficiency of the system\n• Payback period is very short and increase combustion rate\n• Improve and strengthen the combustion\n• Reduces the loss of furnace and the exhaust gas temperature, improve the boiler thermal efficiency.\n• Airpreheater is suitable for all standard fuels \n• They are easy for retrofit into existing systems\n• These airpreheaters are suitable for all waste heat boiler / flue gas boiler / boiler types.\n• They strengthen the heat transfer\n\nApplications of Airpreheater\nBecause of the advantages discussed above Airpreheaters are used in various kind of applications from household devices to industrial purpose \n• In refrigeration economizer system\n• Ovens used in home appliances and industrial uses\n• The dryer applications are heavy energy consumers in the food and non-food industry. Hot exhaust stream is transferred to the cold air inlet stream by using the Airpreheater.\n• In the applications where indirect fired air heaters are required.\n

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Airpreheater – Introduction, Working, Types, Applications' - rinabhagat


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
airpreheater introduction working types applications

Airpreheater – Introduction, Working, Types, Applications

http://www.maniks.com/desuperheater.html

airpreheater
Airpreheater
  • Introduction:
  • Introduction
  • What is Airpreheater
  • Working of Airpreheater
  • Types of Airpreheater
  • Advantages
  • Applications

http://www.maniks.com/desuperheater.html

airpreheater 1
Airpreheater

Airpreheater Diagram:-

http://www.maniks.com/desuperheater.html

what is airpreheater
What is Airpreheater
  • A very basic word to word meaning is a device used to heat the air before processing it to further use.
  • They are also recognized as air heaters or air-heating pipe.
  • It is designed to work to exchange heat energy with desuperheaters.
  • Desuperheater is a Device which is been used to reduce the temperature of the steam in a high heat generation plants where large amount of heat energy or steam is released in the atmosphere

http://www.maniks.com/desuperheater.html

working
Working
  • Airpreheater can be performed by fashion counter flow, co-current flow, co-current flow-countercurrent or cross-countercurrent or cross-co-current flow.
  • The design of the device is depend on the media and the temperature conditions of the application
  • Is in the exhaust gas or in the air containing dust or other particles, so that deposits are expected, preferably smooth tubes are used, which are less prone to deposits and will be clean easier.
  • As they are heating the air passing through it by means of wasted heat energy airpreheateras are used in various areas such as boilers, industrial furnace units and in hot-air ventilation systems

http://www.maniks.com/desuperheater.html

types of airpreheater
Types of Airpreheater
  • Types of Airpreheater

According to the working principle airpreheaters are divided into two types

  • Recuperative or tubular type
  • Regenerative or feed water type

http://www.maniks.com/desuperheater.html

recuperative or tubular type
Recuperative or Tubular Type
  • Recuperative type of airpreheaters is preferably used in small and medium size boilers.
  • In this type heat energy exchange is carried out through the walls of heating surface that separate the heat energy carrier and air to be heated.

http://www.maniks.com/desuperheater.html

regenerative or feed water type
Regenerative or Feed Water Type
  • In this type a feed water airpreheaters exchange of heat energy takes place through alternate heating and cooling of metallic or ceramic nozzles of the fixed or rotating heating surfaces.
  • Regenerative air preheaters are compact and can have stationary rotating hood.

http://www.maniks.com/desuperheater.html

advantages of airpreheater
Advantages of Airpreheater
  • It increases thermal efficiency of the system
  • Payback period is very short and increase combustion rate
  • Improve and strengthen the combustion
  • Reduces the loss of furnace and the exhaust gas temperature, improve the boiler thermal efficiency.
  • Airpreheater is suitable for all standard fuels
  • They are easy for retrofit into existing systems

http://www.maniks.com/desuperheater.html

applications
Applications
  • In refrigeration economizer system
  • Ovens used in home appliances and industrial uses
  • The dryer applications are heavy energy consumers in the food and non-food industry. Hot exhaust stream is transferred to the cold air inlet stream by using the Airpreheater.
  • In the applications where indirect fired air heaters are required.

http://www.maniks.com/desuperheater.html