Abstract
A new method for measurement of local heat flux to water-walls of steam
boilers was developed. A flux meter tube was made from an eccentric tube
of short length to which two longitudinal fins were attached. These two
fins prevent the boiler setting from heating by a thermal radiation from
the combustion chamber. The fins are not welded to the adjacent water-wall
tubes, so that the temperature distribution in the heat flux meter is not
influenced by neighbouring water-wall tubes. The thickness of the heat
flux tube wall is larger on the fireside to obtain a greater distance
between the thermocouples located inside the wall which increases the
accuracy of heat flux determination. Based on the temperature measurements
at selected points inside the heat flux meter, the heat flux absorbed by
the water-wall, heat transfer coefficient on the inner tube surface and
temperature of the water-steam mixture was determined.
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