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accurate measurement of steam temperature

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JA08/02/2017 23:14:25
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Posted by Neil Wyatt on 08/02/2017 20:06:23:

I realise it would be impractical in most boilers, but the best arrangement would be to have the 'in' and 'out' superheater tubes in separate boiler tubes.

Neil

Have the out tube in the hottest part of the boiler, not the smoke box. Perhaps this is why superheating did not always give the expected efficiency on railway locomotives a hundred or so years ago.

I think Dave is right.

JA

Hopper09/02/2017 01:36:17
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I'd have to agree with what Duncan said. Flue gasses are going to be hotter than the boiler water due to incomplete heat transfer from the former to the latter in a single pass arrangment. So if the superheater tubes are smaller diameter than the boiler firetubes, and ideally not touching them, they will be heated by the flue gasses to higher than the water temp. I'd be really surprised if a properly constructed superheater could lower the steam temp. But have no idea what the OP's arrangement is.

If nothing else, a set up like SOD's "bursting with possibilities" laugh arrangement would provide a steam drier if not superheater, which would still improve performance by adding latent heat which could do extra useable work in a steam engine, even though steam temp might not be raised significantly.

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