Skip to main content

What is Forced Draft Fan ? FD fan >> working and Uses

Image
By
Forced Draft Fan is a type of a fan supplying pressurized air to a system. In the case of a Steam Boiler Assembly, this fan is of great importance. As we know, for a Steam Boiler to generate steam, combustion must occur, be it any fuel (wood/coal/rice husk/pet coke/LDO/Furnace oil) and for combustion to exist one of its three main requirements, is the air. And this requirement is compensated by a Forced Draft Fan. 

This fan supplies air to the Air-preheater, where it captures the heat from the flue gases coming from the Boiler Outlet.
Forced Draft Fan

Nowadays, fluidized bed combustion is one of the promising ways of collecting more energy through combustion for solid fuels. But this wouldn’t have even been so famous if there wasn’t any Forced Draft Fan. 
Whether it is Bubbling or Circulating fluidized bed combustion incorporated Boiler. This phenomenon of fluidization is achieved through a Forced Draft Fan only.

 Let us consider Bubbling Fluidized Combustion, Proper designing of the Fan as per the weight of the sand placed on the bed is very essential. 
The pressurized air supplied by the Fan helps in providing enough draft equalizing the weight of the bed and the quantity to be supplied, hence creating fluidization of the sand in the furnace. Not only the pressure head but also the quantity of air supplied for combustion needs to be calculated.

 Also Read: Industrial Fans & Blowers

 Primary Air Fan, Secondary Air fan are the different names of Forced Draft Fan. They all may be installed in the same Steam Boiler Assembly but they all operate at different levels of flow (m3/hr) and Head generated (mmwc). 

 Sometimes excess air required for complete combustion is compensated by the same FD Fan or a separate FD Fan also known as Secondary Air Fan is installed to carry out the function. 

 Forced Draft in a fan occurs when the fluid handled by the fan (generally air), is retained beyond the atmospheric pressure. 

 Every fan designer must never underestimate the importance of the properties and composition of the fuel to be combusted and the bed height in the furnace.
We at Thermodyne Engineering Systems, have successfully designed, manufactured and supplied Force draft fans to almost all of our customers and have successfully installed and commissioned them for highly efficient boiler operation.  

 Because it is being rightly said (in terms of Boilers)
 “A HAPPY FAN, MAKES BOILER HAPPIER”
source-thermodyneboilers.com
Labels:

Comments

Post a Comment

Popular posts from this blog

Why spirals are provided at the Idustrial Boiler Chimney

By
Chimney:- Chimney , as we know, is used to reject the flue gases to the atmosphere, coming from the Steam Boiler during operation. Also, it is a megastructure in Steam Boiler assembly and any discrepancy in its structural and foundation work can cause extremely serious damages, may even lead to casualties or plant shut off till its re-erection. The designer must consider all the factors while designing chimneys and one of the major factors amongst them is the wind factor. Blowing wind tries to overcome its static inertia but fails, if spirals are provided on the surface of the chimney. BUT THE QUESTION IS HOW????? Consider a chimneys (without spiral wings) , when the blowing wind comes in contact with its upstream surface, stagnation point (zero velocity) is achieved at that point i.e. pressure generated is high at that point and at the downstream end a vacuum is created as the wind coming in contact with the chimneys , gets deflected and meets after some point (wake regio...
8 comments
Read more

Critical Thickness of Insulation and It's Effect on Boiler Efficiency

By
Welcome to the THERMODYNE BLOG, today in this article we are going to explore the thickness of insulation and its effect on boiler efficiency and other parameters. Critical thickness of insulation and its significance             The information in this article gives a significant collection of data you need to know about the boiler and its performance, the parameter that affects the boiler efficiency .         Table of content INTRODUCTION THICKNESS OF INSULATION CRITICAL RADIUS EFFECT ON BOILER EFFIIENCY INSULATING MATERIALS CONCLUSION INTRODUCTION- The  thickness  up to which heat flow increases and after which heat flow decreases is termed  critical thickness . In the case of cylinders and spheres, it is called the  critical radius . The  critical radius of insulation  can be derived depending on the thermal conductivity of the insulation k and the external convection heat ...
6 comments
Read more