We conduct accurate furnace temperature measurements of flue
gases by using a water-cooled suction pyrometer otherwise known
as an HVT Probe. The probe in short consists of shielded
thermocouple for radiant heat from the combustion process, flue
gases are withdrawn past the thermocouple by using a suction
pump or an air aspirator.
The suction pyrometer is used to map and plot temperatures in and
across the combustion camber. This information can show local
laminar gas columns due to for example insufficient secondary
air mixing, poor fuel distribution on the grate/fuel bed etc.
Accurate temperature measurements are also vital for optimising
any SNCR system.
Temperature Profile in a 120MWe Pulverized Coal Fired Boiler
The HVT Probe is also used to conduct flue gas analysis. Here the
extracted flue gases are drawn to a flue gas analyser. ECOMB AB
currently operate a portable Horiba PG-250 that can
simultaneously measure NO, CO, CO2, SO2 and O2. The data is also
recorded directly to a data logger so it can be analysed in
detail at a later stage.
The flue gas analyser gives us information on air/fuel ratios
across the furnace section. This information together with the
temperature measurements gives ECOMB and the local operators the
chance to optimise the combustion process with regard to
emission of NOx, CO and 02.
CO and O2 Profile in a 120MWe Pulverized Coal Fired Boiler
By conducting a combination of temperature and flue gas
measurements the possibities to optimising the day to day
operation of your combustion plant are drastically improved.
The route cause of boiler fouling and build up of deposits can in
many cases be explained and helped by understanding and
adjusting the combustion process in detail.
