Single Pipe Steam Oil to Coal/Oil Conversion

Single Pipe Steam Oil to Coal/Oil Conversion

PostBy: steamed1 On: Sat Jun 07, 2008 1:15 pm

There is a wealth of knowlege here! I'm looking to gain insight to assist in converting my current heating system from oil single pipe steam to be coal with oil backup. I do not have space to leave my current boiler in place with the addition of a coal steam boiler. I can retire my current boiler (8yrs old) and perhaps harvest oil and steam parts for a new/used steam boiler. I am not looking to convert over to a hot water heating system. I like the steam and my steam system works well. I'm just looking to take advantage of using coal. I'm currently heating DHW with 30gal propane unit.

This is what I have read thus far in doing my reasearch for this project:

Currently looking at the stoker units, Keystoker KA6 and EFM DF520. I understand the Keystoker needs to be sized for my current system and the EFM is adjustable by feed ratio.

I can also add a coil to heat my DHW. I can direct hot water from boiler to hot water tank and circulate via siphion system or circulationg pump. I'm not sure if this is the best way to go or if necessary with coil.

EFM stated they only warranty boilers for 1yr for steam since steam is more prone to corrosion failure. Is this accurate and how does this play into selectiong a used boiler?

Some companies or persons sell "reconditioned" boilers. What is usually done to "recondition" a boiler and what should you look for when selecting a used boiler of either make?

How much coal should I expect to burn? Looking at the specs for my current boiler and comparing to the steam output of the EFM I would be setting on the 5 or 6 teeth setting.

I do not know what I might have overlooked... Any insight, correction or direction would be much appreciated. I look forward to burning coal soon.

Thanks
steamed1
 
Stove/Furnace Make: Looking
Stove/Furnace Model: TBD

Re: Single Pipe Steam Oil to Coal/Oil Conversion

PostBy: Sting On: Sat Jun 07, 2008 2:13 pm

Converting from single pipe steam to hot water heat requires a LOT or new piping and FIRST check that you radiation can be converted. Some steam radiation will mot flow supply and return. Also steam radiation is sized for steam temps so may be undersized with hot water energy!

stick with steam
Sting
 
Other Heating: BurnHAM=NG-gas

Re: Single Pipe Steam Oil to Coal/Oil Conversion

PostBy: steamed1 On: Sat Jun 07, 2008 2:38 pm

Thanks for the reply Sting but I do not think you noticed in my post that I want to keep steam.
steamed1
 
Stove/Furnace Make: Looking
Stove/Furnace Model: TBD

Visit Lehigh Anthracite

Re: Single Pipe Steam Oil to Coal/Oil Conversion

PostBy: coaledsweat On: Sat Jun 07, 2008 4:12 pm

The EFM will work great. There are a few members that can help you out with used and reconditioned units, I'm sure they will chime in shortly.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: Single Pipe Steam Oil to Coal/Oil Conversion

PostBy: mozz On: Sat Jun 07, 2008 6:24 pm

"EFM stated they only warranty boilers for 1yr for steam since steam is more prone to corrosion failure. Is this accurate and how does this play into selectiong a used boiler?"
Good friend of mine is running a EFM 520 with a 1 pipe steam for 50 some years? It's the round door model so that tells you how long its been in service, year round. AHS and AA both make a unit that will work with your setup. I have a AA130 in the works will be getting it to refurb it this summer, hopefully have it online before the cold sets in.
mozz
 
Stoker Coal Boiler: Axeman Anderson 1982 AA-130 Steam

Re: Single Pipe Steam Oil to Coal/Oil Conversion

PostBy: Sting On: Sat Jun 07, 2008 9:41 pm

steamed1 wrote:Thanks for the reply Sting but I do not think you noticed in my post that I want to keep steam.



:D :D :D :D DAAAAA :? :? :? :? :?

Senior moment --- no Really its the Mad Cow --
Sting
 
Other Heating: BurnHAM=NG-gas

Re: Single Pipe Steam Oil to Coal/Oil Conversion

PostBy: steamed1 On: Sun Jun 08, 2008 10:42 pm

mozz wrote:"EFM stated they only warranty boilers for 1yr for steam since steam is more prone to corrosion failure. Is this accurate and how does this play into selectiong a used boiler?"
Good friend of mine is running a EFM 520 with a 1 pipe steam for 50 some years? It's the round door model so that tells you how long its been in service, year round. AHS and AA both make a unit that will work with your setup. I have a AA130 in the works will be getting it to refurb it this summer, hopefully have it online before the cold sets in.


Thanks for the reply Mozz. I checked out the AHS. The coal/oil unit looked to be hand fed. Only the Coal gun seems to be a stoker unit. AA130 looks simular to the DF520. Do you know how they compare as far as quailty. Pro or cons of either unit?
steamed1
 
Stove/Furnace Make: Looking
Stove/Furnace Model: TBD

Re: Single Pipe Steam Oil to Coal/Oil Conversion

PostBy: Yanche On: Mon Jun 09, 2008 10:56 am

Since you have a steam system be sure you understand how to properly size a replacement system. Steam systems must be size on the amount of installed radiation, not on the heat loss of the building. If the replacement boiler is to large it will not work well. Seems counter intuitive but that's the case. Here's one reference to start your understanding of the problem.
http://www.bellgossett.com/Press/CounterPointJune2002-B.pdf
This link is broken, either the page no longer exists or there is some other issue like a typo.

One pipe steam systems are also difficult to balance because so much of the performance is dependent on proper piping installation. If your system worked well with you old boiler great. But if not and you need to make corrections or improvements, I'd suggest buying the book "Lost Art Of Steam Heating" from http://www.heatinghelp.com/.
Be sure you understand latent heat concepts and how it's essential to match steam production to radiation. While I'm not an expert I'd guess desirable characteristics of a coal steam boiler would be one that could quickly respond to demand, i.e., make steam quickly or shut down quickly. Boilers with large water capacities when configured for steam use would not be desirable. Take a look at the AHS S130 and get a couple of reference customers using them with steam. Above all don't oversize. Big is not better in this case.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Re: Single Pipe Steam Oil to Coal/Oil Conversion

PostBy: steamed1 On: Tue Jun 10, 2008 6:59 pm

Thanks Yanche. The sizing of my boiler was done 8yrs ago and works great. Each radiator was measured and calculated. I get no hammering whatsoever. The system is really working quite well. I figured I should try to match the specs of my current boiler as closely as possible with the conversion to a coal/oil unit. I looked again at the S130. It looks like a good unit. It seems to be coal only though and not a coal/oil unit. Is this correct? I was looking for a multi-fuel coal/oil boiler. Some EFM units have the capability to burn oil and coal.
steamed1
 
Stove/Furnace Make: Looking
Stove/Furnace Model: TBD

Re: Single Pipe Steam Oil to Coal/Oil Conversion

PostBy: Yanche On: Tue Jun 10, 2008 10:12 pm

The AHS S130 coalgun boiler is Anthracite coal only. I'd keep your existing steam boiler as a backup. Dual fuel boilers are always compromise on efficiency, you are better off with two single fuel boilers. Your challenge will be integrating the two boilers steam production. I don't know how to do that for a steam system. Ask the question on the "heatinghelp.com" forum.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Re: Single Pipe Steam Oil to Coal/Oil Conversion

PostBy: steamed1 On: Tue Jun 10, 2008 10:58 pm

I wish I could have both a coal boiler and my original oil as a back up. As in my original post I do not have the space to accomodate both units. So I am looking into a coal/oil unit. I realize that it will be a trade-off on efficiency to have the oil as backup on the same unit.
steamed1
 
Stove/Furnace Make: Looking
Stove/Furnace Model: TBD

Visit Lehigh Anthracite