Total Pageviews

Monday 6 May 2013

ID,FD,PA FANS FOR BOILER IN THERMAL POWER PLANT PLAN AND BRIEF DESCRIPTION OF FANS

Till my last dispatch I completed the topics of Boiler  structure , Boiler Pressure Parts , Rotary air preheater as major equipment . I have discussed about the plans and erection sequence of the same . Now I will discuss about the fans ( ID , FD and PA) .I am receiving number of e-mails about my dispatches .The questions  are mainly about erection sequences ,clarification of the pictures , suitability of my erection sequence with their project and also about construction equipment. I
request all the readers to read relevant blogs of my 87 dispatches and he will certainly get the answer.
If there is any doubt I will be there to help you out.
Erection sequence of FANs differs with the layout of the plant. According to Mill position side ,rear
or front Fan erection  sequence differs. These are true for FD ,PA fans only. ID Fan is independent of
Boiler erection . An e-mail received from one of the reader about the commencement of civil work for foundations.

First of all we should not consider only fans in that area. There will foundations for Duct support
between Boiler Outlet Flange to ESP , Foundations for Transfer point structures , foundations for
Mill Reject System silos.If foundations require piling then piling and pile cap to be completed
with boiler foundations. If pile cap drawings are not available then pile cap can be  done afterwards.
But then pile cap to be carried out one by one. It has been seen that this type of job leads to delay
due to massive excavation for individual fans.This excavation can only be started when Boiler supporting structure erection completion ( ceiling Girder erection , rear structure erection and air heater  structure erection completion). There should be alternate route for feeding second Pass Pressure Part
material feeding . Civil works for other foundations are to completed with fan foundations . Minimum two heavy duty crane ( 250 MT) capacities will be placed in boiler rear to carry out erection work of Boiler and CHP.Individual fan erection time cycle is around three months to four months. During this time boiler 2nd pass erection ,ducting above air heater , air heaters , Eco handling structures , ESP side inlet nozzle , Gates and dampers of ducting will also be required for erection completion. Therefore this area is very important regarding interfaces are concern and close co-ordination and monitoring are required .

Besides ID ,FD and PA there are two important fans are there one is seal air fan and other is scanner fan. A brief description is given below.
                                                               FANS FOR POWER PLANT


-Supply air for combustion in the furnace and for evacuation of the flue gases formed from the combustion.
-Maintain Balanced Draft inside the furnace.

-Supply air for cooling of equipments working in hot zones.

-Supply air for sealing of gates, feeders & mills bearings etc.

-Air used for combustion is divided into 2 parts:

1.Primary Air
Portion of total air sent through mills to the furnace. This air dries the pulverized coal and transport it to the furnace for combustion.
2.Secondary Air

Large portion of total air sent to furnace to supply necessary oxygen for the combustion.

Types of Fans  :- 1. Axial Fan with two subgroup as i) Impulse ii) Reaction.

2. Radial fans or Centrifugal fan. ( Single suction or double suction).

                                                FD FANS
Supplies secondary air to the furnace through APH to assist in combustion.
Supply total air flow to the furnace except where an independent atmospheric P.A fan is used.
Provides air for sealing requirement and excess air requirement in the furnace.
Axial fan-reaction type with blade pitch control is use in the Pulverized fired boiler(210/250/500 MW).

                                                                    PA FANS







Supply high pressure primary air through APH needed to dry & transport coal directly from the coal mills to the furnace.
Primary air for mills is divided into cold & hot primary air.
Axial fan-double stage-reaction type with blade pitch control is use in the Pulverized fired boiler(210/250/500 MW).

                                                                    ID FANS 

Suck the gases out of the furnace and throw them into the stack by creating sufficient negative pressure in the furnace (5-10 mmwc) in the balanced draft units.
Located in between the ESP and Chimney in the flue gas path.
Radial Fans -double suction-backward curved vane with inlet guide vane(IGV)control and VFD control is use in all boilers

Handles large volume hot dust/ash laden flue gas (temp up to 150 deg C) from furnace and all leakages occurring in the system till the inlet of the fan.
Overcome the pressure drop inside the furnace, Super heater, Re -heater, Economiser, Gas ducting & ESP.
Consumes max. power in all boiler auxiliaries as it handles the large volume and heavy pressure drop of the flue gas.

                                                               SCANNER AIR FANS 


Scanner Air Fan is belong to Centrifugal Fan category.
Supply cooling air to all the flame scanners at different elevations housed in the furnace for sensing flame.
A.C scanner fan boost the pressure of cold secondary air from F.D fan discharge duct in normal operation.
D.C scanner operates only in case of a.c power failure and sucks air directly from the atmosphere.

                                                                     SEAL AIR FANS

Seal Air Fan is also belong to Centrifugal Fan category.
Supply seal air at a pressure higher than system or equipment pressure.
Supply seal air to raw coal feeders, mills bearings, gates etc
Seal fan either boost the pressure of cold secondary air from F.D fan discharge duct or takes air directly from the atmosphere in normal operation.

In my next part i will provide erection sequence of three major fans.


P.S If  you are looking to earn few legitimate extra money from the comfort of your home then please click on the link given below



















26 comments:

  1. Hi really a nice post and thanks for giving the complete information and application regarding Axial Fans hope to see more posts.

    thank you

    ReplyDelete
  2. Boiler sequence control
    Loved this article. Would surely take the advantage.

    ReplyDelete
  3. Really its a very useful article in power plant job
    Thanks

    ReplyDelete
  4. Centrifugal Fan Manufacturers in India is mostly using in all kind of pollution control equipments.In industries so many dust & Polluted air,so bag filter used in industries.

    ReplyDelete



  5. Air tech engineering Customs built fans from smaller to larger size can to handle air/gas volume from 1080 m3/Hr to 435000 m3/Hr and pressure ranging from 25mmwc to 3000 mmwc in single stage and 5000 mmwc in two stage .
    Our Fans are design for High efficiency ,and Rugged in design for smooth operation and higher life span . Centrifugal fans are available in various blade profile .
    Centrifugal Fan Manufacturers in India
    The different types of blades are

    • Forward curved
    • Backward curved
    • Straight Radial
    • Radial tipped
    • Backward inclined
    • Paddle type open impellers
    • Aerofoil
    Fans are offered in different drive arrangements like

    • Direct mounted on motor shaft
    • Direct coupled
    • Belt driven

    ReplyDelete
  6. This comment has been removed by the author.

    ReplyDelete
  7. Hi people who can help men

    ReplyDelete
  8. This is an interesting article. I have never seen a mass heater like this before. It is amazing what new technology they are coming out with these days. for Boiler Manufacturer. Really your informative blog helpful for Thermic Fluid Heater

    ReplyDelete
  9. But also provide diagram to batter understand .after all it very good.

    ReplyDelete
  10. Very nice post. The information provided is very helpful for me as a vacational trainee at thermal power plant.
    Thanks for sharing

    ReplyDelete
  11. When to use igv and when to use blade pitch control???

    ReplyDelete
  12. Thank you for your wonderful information check_out most reputed
    Axial flow Fan manufacturers Chennai

    ReplyDelete
  13. the blogpost is very informative........thank you....
    http://www.essarairsystems.com/boiler-id-fan-manufacturer.php

    ReplyDelete
  14. Useful Information! thanks for sharing this blog with us. Searching Home Appliances Manufacturers in India then go to the nearest home appliances store and buy the required product.

    ReplyDelete
  15. Thanks, for sharing such a useful information with us. M.G Engineers is one of the best Big Industrial Fan Manufacturers in Ahmadabad.

    ReplyDelete
  16. I believe you have mentioned some very interesting points, regards for the post.
    top best panasonic fans in dubai

    ReplyDelete
  17. Woah! I'm really digging the template/theme of this website. It's simple, yet effective. A lot of times it's hard to get that "perfect balance" between usability and visual appeal. I must say that you've done a amazing job with this. Also, the blog loads very fast for me on Opera. Excellent Blog!
    Industrial boiler

    ReplyDelete
  18. Whats up are using Wordpress for your blog platform? I'm new to the blog world but I'm trying to get started and create my own. Do you need any coding expertise to make your own blog? Any help would be really appreciated!
    Installation Hotwater tank Richmond

    ReplyDelete
  19. تولید و گردآوری مجموعه متنوعی از نوار چسب های تولید داخل و خارج نموده است.
    چسب

    ReplyDelete
  20. Thanks for sharing this article as it provides a depth knowledge about the ID Fans. But we also like to say that Makpol Industries is one of the leading company among Id Fan Manufacturers, in India and we offer a variety of Filter bags and Industrial Fans like Centrifuge Bags, Filter Pads, ID Fans, Filter Cloth, FBD Bags and many more items. For more details, click on the highlighted words or visit our website.

    ReplyDelete
  21. HVAC Service
    Same Day Service , Punctual & Reliable Technicians, Licensed and Insured, No Hidden Fees, Free Estimates for Installations

    24/7 Emergency Service
    We have provided a wide range of services all over the lower mainland for over 25 years. For all your HVAC and cooling needs, call us at any point of time 24/7 without keeping any doubt in mind.

    We Service All Brands
    We service, repair and install a number of brands including Lennox, Trane, American Standards , Rheem , Carrier , Goodman & more!

    https://angelsheating.com/

    ReplyDelete
  22. I believe you have mentioned some very interesting points, regards for the post. also visit the link Centrifuge Bag Manufacturers

    ReplyDelete