And The Answer Is…

5

Sunday 24 November, 2013 by Uncle Spike

Yes, yes… the ANSWER to yesterday’s teaser

A few good guesses guys; some of which got pretty close to working
out what this ‘thing’ was that took up most of my Saturday morning.

 .

.

Well, here is the answer…

A few times over the past week we have been using the central heating, just upstairs in the bedrooms for a few hours before sleepies. Although only running on a low temperature, the system failed to reach or certainly maintain temperature a couple of times recently. On Saturday I went to investigate, armed with a toolbox full of goodies…

We have a large coal fired boiler system and after an hour or so taking varying pieces apart, I found the problem. The coal we use is in small chunks (like 10-15mm or ½”), with up to 200kg (440 lbs) stored in an attached steel hopper. This is then ‘fed ‘into the boilers’ furnace for 2 seconds duration every 110 seconds. Using coal with a BTU rating of 6400, this maintains a water temperature of 50 (122 F), plenty for this time of year and running only 10 of the radiator panels.

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ONE PARTIALLY DISMANTLED BOILER

ONE PARTIALLY DISMANTLED BOILER

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The problem was relatively simple, albeit costly of course. The ‘thing’ was to blame. It is a screw conveyor or auger conveyor; a mechanism that uses a rotating helical screw blade, called a “flighting”, within a tube, to move the granular coal from the hopper into the burn chamber. Some of you got close to guessing it…

EXTRACTING THE XX SCREW FROM THE FEED TUBE UNDER THE HOPPER

EXTRACTING THE SCREW FROM THE FEED TUBE UNDER THE HOPPER

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HEAVY DUTY ELECTRIC MOTOR WHICH DRIVES THE SCREW

HEAVY DUTY ELECTRIC MOTOR WHICH DRIVES THE SCREW

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Anyway, the blades of the screw had rusted and worn down over the past 4 years and this resulted in only larger chunks of coal being fed into the chamber, whilst most of the coal just went round and round in the tube, going nowhere. A new screw is on order from Izmir, so no heating until Tuesday-Wednesday, and then let’s see if I have any parts left over when I reassemble it all 🙂

All good fun, eh?

5 thoughts on “And The Answer Is…

  1. raiz1972 says:

    Ooohhhhh I see now 🙂

    Like

  2. I hope the new replacement augurs well for you. Pun intended.

    Like

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