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Green Building Bible, Fourth Edition
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Heating and cooling: Cleaning Wood Gasification Boiler and bent SS bits.

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    Just done my first annual clean. Its a 40Kw basement monster. In the fire chamber is a fairly thick (3-5mm) layer of brittle, black, glass-like shiny deposit (most with crusty bits on top) . Getting it off would be LOADSA work. Comments? Will it carry on getting thicker? BTW only finest quality, v dry oak has been burned.

    The 2 x 20mm dia SS bars sitting in the bottom where the gasses are drawn (making the lovely foot long blue blow torch) are obviously bent (will post pic if wanted). Tried straightening it cold on my vice (dumb dumb dumb!). Given the industrial inexact nature of the beast, can I leave until failure?

    My rodding out wire brush end for my 10 exhaust tubes has barely lasted one season, will buy 3 more me thinks.
    • CommentAuthorCWatters
    • CommentTimeSep 29th 2010
     
    Are the SS bars just round rods? Might be easier just to replace them. 20mm SS bar stock is reasonably cheap at around £5-£7 a meter. I bought some to use as locating pins for a wall made from railway sleepers. The metal shop I used even cut them to length for me free. You might consider upgrading to 22 or 25mm if that would fit and not mess with the way it burns.
    • CommentAuthorowlman
    • CommentTimeSep 29th 2010
     
    I replaced the SS round bar in the bottom of my log gas boiler earlier this year. The original, about 500mm long and 20mm thick had been reduced to an hourglass shape, and only 4mm thick in the middle, after 1500hrs burning time. The operating temp in the bottom of a log gas boiler can reach in excess of 1100C and that continuous high temp. will quickly reduce normal grade SS. I went for a high temp grade, it cost me dear, and I had to buy 2 mtrs of the bl---y stuff. I'll try and dig out the grade and cost for you.
    Regarding the tarry deposits in the fire chamber, I was told to leave them, I guess they protect the steel water jacket.
    • CommentAuthorreilig
    • CommentTimeSep 29th 2010
     
    Hi Guys,

    Just to add my twopence worth.

    I know that Atmos advise against burning all oak in your log gasifying boiler because of a build up of soot caused by the acid in oak (I think - I'll fish out the document somewhere and give you the exact quote).

    I'm trying to burn a teaspoon of Bluestone or Copper Sulphate (CUSO4) in my boiler and stoves once a week. Its supposed to allow any soot in your boiler stove or chimney to burn at a lower temperature and thus make it cleaner (It has certainly worked well in my stoves, but haven't tried it in the boiler yet as I haven't lit it since before last summer). It works great on a chimney if you use it before you sweep as it dries out all of the soot and loosens it - making it really easy to sweep. Regular use is supposed to reduce the amount of soot in your chimney by up to 75%. Some of the supermarkets sell little packages that you can burn to clean stoves and solid fuel boilers and they burn blue just like the bluestone - so i presume that's what's in them. At €6 per kg, its a very cheap way of keeping it clean.
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    Thanks guys as usual. Yes they are 20mm rods but welded onto short cross bars which themselves have short locating bars (all 20mm rods). Funnily enough today I found a first class steel fabricator I think I'll pop along and see what he can do for me. Looks like jury is out on the Oak but I don't understand the lower temp helping thing and anyway my flue came clean as a whistle with no effort at all. This year at least I'll leave the black glass stuff.

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