Heat flux measurement – SMART Flux sensor
SMART Flux sensors continuously measure the heat flux in the furnace. A multiplexer bundles, filters and amplifies these signals and passes them to SMART Furnace--FACOS, which is the analysis centre. Reduced heat flux values are key indicators for necessary on-load boiler cleaning, before efficiency drops too low. |
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Principle of heat flux measurement: |
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Heat flux measurement
based on tailor-made thermoelements
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Flame and flue gas temperature measurement – SMART IsoTemp
SMART IsoTemp measures the flame and flue gas temperature in the furnace in a continuous, nonintrusive way. The two-dimensional measurement shows the temperature distribution of a complete furnace level. A non-uniform distributed combustion temperature in the furnace leads to selective, thermally stressed heating surfaces which accelerates deposit build up. A furnace exit gas temperature which is too high can be an indication of suboptimally set combustion, which supports slag formation in the convective area. |
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SMART IsoTemp shows the temperature
distribution of a complete boiler cross section.
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Surface temperature measurement – SMART InfraScan
SMART InfraScan measures the surface temperature of the boiler wall in the furnace using infrared sensors. The detected temperature distribution is visualised in different colours. The thicker the deposit, the higher the surface temperature – which means that high temperatures are an indicator of heavy slagged areas with deposits. |
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SMART InfraScan in operation
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Deposit weight measurement – SMART Gauge Sensor
Mounted on hanger rods, SMART Gauge sensors measure the development of deposit build up in the superheater area by weight changes of the heat exchanger bundles over the time. Increased fouling is indicated by an increase in weight. As such, deposit hotspots can be located. |
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Example:
Results of measuring the deposit weight
Strain gauges record weight changes as a signal. Combined with the information where the SMART Gauge sensors are placed, the actual deposit situation can be shown in the form of a deposit weight distribution. |
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In this case,
fouling inside
the heat
exchanger
bundle is
stronger
than on the
outside. |
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Here, the
superheater
area is deposited
evenly. |
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