soot blowing cycle 1

[BINGMD]

I am working on a 100 MW boiler proposal. In order to estimate annual coal cost, we need to know how long we will run the sootblowers. I have 52 sootblowers. Can I assume each sootblowers need 2 minutes to finish sootblowing, so total sootblowing time per shift would be about 100 minutes? I have no operation experience, so I hope to get advice from people with real experience to confirm my assumption. Thank you very much.

 

[metengr]

What is the fuel you will be using??????

 

[BINGMD]

It is South Africa bituminous coal. It is low slagging coal, so I think one cleaning cycle per shift is enough. Thanks.

 

[rmw]

What type of soot blowers; are they all retractable or are there some rotaries, any furnace wall blowers?

There are companies that specialize in SB controls that blow critical blowers on a different time table than non critical blowers. There is not much use in blowing a blower that doesn't need blowing while neglecting one in a zone that is building up ash.

They also program to blow based on measurable parameters, temperatures, etc throughout the boiler.

I will think for a while and try to post back when I remember their name.

rmw

 

[sjrfc2]

I would speak to the soot blower companies. Two that I remember are Copes Vulcan and Diamond. The steam consumption was based on nozzle and lance design, which in turn is dependent on bank geometries including tube spacing. The two notable nozzle designs that I remember were venturi and straight bore. The straight bore were used where we had a boiler designed for high gas flows/velocities and very tight tube spacing. The cleaning was by mass action of the steam. It consumed a lot of steam.

Most of the other designs with wider tube spacing used venturi nozzles and cleaning was more dependent on steam velocity.

The steam consumption varied tremendously between the two nozzle designs and depending on depth of furnace/gen bank its going to drive # of nozzles. So I don't think its an easy thing to SWAG unless you had better definition of nozzles/# nozzles/time of blow.

 

[smartengine]

hi, in my plant we have 28 no of soot blower ,from which 8 are LRSB type Long Retractable soot blower and other 20 are rotary type . LRSB takes around 2 min to operate and for rotary it is less than 1 min.

 

[BINGMD]

Thanks to all. Smartengine gave me the info I need. Have a great day, every one!

 

[rmw]

There is no "one size fits all" when it comes to soot blowing. It is a function of your ash, its friability (I may have just made that word up) and/or fusion temperature. Better do some more research on your coal and your ash rather than taking a random number off of an anonymous forum.

Contact Copes Vulcan, or Diamond or Clyde or Bergeman or any other soot blowing manufacturer you can find. Read their literature and websites.

Too little sootblowing and you will plug your boiler up. Too much, and you will waste energy and cause unnecessary tube wear.

rmw

 

[BINGMD]

Thanks, rmw. I will talk with the sootblower vendor once we select one.

 

[boilerone]

BINGMD,

Sootblowing requirement and steam consumption is typically boiler supplier's guaranteed value based on fuel, combustion method and, of course, their boiler design. Therefore your best shot is contacting your boiler (even potential) supplier.

For general estimation, yes, contact the sootblower guys for typical values.

Boilerone