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Old 04-14-2010, 09:36 PM
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Default Boiler Economizer Soot Blowers

School is over, so its back to work. Today I was working on the installation of Diamond brand, model S9B, steam powered soot blowers on 3 boiler economizers in a facility in Utica, NY. The boiler are 400 hp firetube boilers, firing either natural gas or #6 fuel oil. The #6 oil has to be heated to about 240 degrees (F) to lower the viscosity of the oil to allow it to flow and atomize properly in the boiler. The #6 oil at room temperature, has the look of roofing tar, and has to be kept warm (about 130-150 degrees) at all times to or the oil pump will not be able to pump it thru the pipes to the boiler, where additional heaters are utilized to elevate the temperature to the temperature required to burn cleanly. The oil when burnt in the boiler usually leaves a heavy coating of soot in the boiler and if equipped the economizer. The soot blower takes steam from the header and thru a electronic control system, blows the soot out of the economizer and out the stack. the object is to blow often enough to keep the soot from actually accumulating in the economizer and to even during the blowing process to still have a clear stack.

The soot blower weighs about 200#, and with the soot lance and hardware goes to almost 300#. The blower and lance is assembled then installed into the economizer, and sealed with a stuffing box type packing. After assembly the soot lance is tack welded to the blower outlet so it won't vibrate loose during operation. This unit has an electric drive motor and an automated control, with the push of button, the unit cycles a number of times, shuts off, then after a timed period, blows again, then the operation repeats its self until the boiler operator shuts the system it down.


1 - soot blower in the shipping box
2 - soot lance in its protective shipping cover
3 - control cabinet
4 - stuffing box
5 - assembled and mounted soot blower, awaiting steam supply line and power



jack
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Old 04-14-2010, 09:41 PM
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6 - The soot lance mounting
7 - mounting and manual clean out door
8 - economizer, 7' wide x 3' thick x 6' tall, weight about 4400#
9 - the boiler, economizer and the economizer supports


jack
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Old 04-14-2010, 09:54 PM
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Thanks for the write up Jack,

I tried googling a blower like you are showing us about. That resulted in some rather interesting results. Nothing to do with what you are teaching us.

What kind of blower is it. A centrifugal fan, positive displacement, or other?

I could not tell by the picture. It did look like it has a right angle gear box mounted on the motor.

Thanks

Scott
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Old 04-14-2010, 10:08 PM
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I have not very fond memories of working on soot blowers in the Navy.
Ours were either crank, or chain driven, depending on the location.
They were a bear to keep packing in.
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Old 04-14-2010, 10:21 PM
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I missed out on where the lance goes? And exactly what does it do?
Lance a boiler?
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Old 04-14-2010, 10:34 PM
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Quote:
Originally Posted by Scotts View Post
Thanks for the write up Jack,

I tried googling a blower like you are showing us about. That resulted in some rather interesting results. Nothing to do with what you are teaching us.

What kind of blower is it. A centrifugal fan, positive displacement, or other?

I could not tell by the picture. It did look like it has a right angle gear box mounted on the motor.

Thanks

Scott

Scott,


No fan, no blower motor, just steam flow and pressure, the steam goes thru the blower assembly, out thru the lance inside of the economizer, the steam causes a tornado in the economizer, allowing the soot to go out the stack.

Quote:
Originally Posted by cutter View Post
I missed out on where the lance goes? And exactly what does it do?
Lance a boiler?
Cutter,

The lance is a pipe, with a series of orifice holes in a staggered pattern to cause a sweeping action as the electric motor spins the lance in side of the economizer, the soot blower assembly remains rigid and the lance is spun inside.


jack
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Old 04-15-2010, 06:11 AM
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Thanks for the description and pictures Jack.

Over in Lake city Pa (west of Erie) WAS copes vulcan company.
I knew people that worked there, and they talked often
of building these things.

I have heard of some extremes in these like a 20 or 30' long lance,
and having to survive some serious temperatures.

I had a general idea what these where/doo, based on peoples
hand motions/scribbles, but this write up of yours makes it
all clear.
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Old 04-15-2010, 06:18 AM
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Quote:
Originally Posted by Scotts View Post
Thanks for the write up Jack,

I tried googling a blower like you are showing us about. That resulted in some rather interesting results. Nothing to do with what you are teaching us.

What kind of blower is it. A centrifugal fan, positive displacement, or other?

I could not tell by the picture. It did look like it has a right angle gear box mounted on the motor.

Thanks

Scott
Here's a pretty good reference:
http://amnrrr2.blogspot.com/2008/12/sootblowers.html
This is just like the ones we had aboard ship.
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Old 04-15-2010, 06:33 AM
danski0224 danski0224 is offline
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I did a short stint in a coal fired power plant that had several of these things... but they were quite a bit longer (about 20') and moved (steam driven) in and out of the boiler, probably due to the internal temperature.

Some warning signs would have been nice. I didn't know what they were, had to work nearby, and most seemed to need maintenance. Fortunately for me, I was not close to one when it turned on. I stayed much further away when I saw the steam escaping.

That boiler was 11 stories tall and hung from the ceiling... it expanded downwards about a foot.

I heard the boiler experienced sudden and catastrophic failure (again) after the refit that started just after I left. Oops. Hope no one got hurt.
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Old 04-15-2010, 03:45 PM
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Quote:
Originally Posted by platypus20 View Post
Scott,


No fan, no blower motor, just steam flow and pressure, the steam goes thru the blower assembly, out thru the lance inside of the economizer, the steam causes a tornado in the economizer, allowing the soot to go out the stack.

jack
Thanks Jack.

Scott
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