HVT Gas Sampling
Why Testing Is Important:
The greatest benefit to performing HVT testing is that
it allows the user to identify combustion parameters as
close to the combustion zone as possible. Results of the
test are indicative of furnace cavity characteristics that
are not “biased” by possible “air leakage”. Data
collected can assist in identifying extreme fuel imbalances,
secondary air imbalances, closed secondary air
registers, burner line fuel pluggage and instances of
excessive air infiltration. For example, the figure above
illustrates the Oxygen profile on a 500 MW wall fired
unit. The dip or cavity in the Oxygen level correlates
with an air register which was frozen in the closed position.
Furnace High Velocity Thermocouple Traverses Are Performed to Accomplish the Following:
- Quantify furnace exit gas temperature.
- Ascertain furnace temperature profile.
- Quantify furnace Oxygen level.
- Ascertain furnace Oxygen profile.
- Furnace CO and NOx profile can also be determined.
