Carbon in Ash Monitor (G-CAM)

G_CAM Unit Installed

G-CAM Unit Installed

  • CIA Monitor GCAM


  • The Carbon In Ash Monitor (G-CAM) is not influenced by different coals. It utilizes microwave technology which, in turn, is not influenced by the variance in shading and optical properties of the fly ash.
  • One calibration would be applicable to a boiler. Microwave measurement coupled with density compensation results in excellent measurement accuracy.
  • Superior availability. An EPRI report from Gaston plant in Alabama clearly demonstrates the superior peG-CAM pipingrformance of the recently revised technology at better than 90 % measurement availability.
  • In the 6-month evaluation, non-availability comprised of no measurement at low loads due to low fly ash concentration in the duct. No maintenance was actually required over the 6-month period at Gaston.

Unburnt CarbonThe Carbon in Ash Monitor can have a totally different front end called a PHS sampler, which rapidly samples from up to 6 transport lines for carbon in fly ash measurement. The typical turnaround time for each sample point is 30-45 seconds. This allows for measurement of multiple precipitator hoppers when discharging. A dedicated controller (PAC 1000) can be used to fully automate precipitator hopper discharge, controlling the transport route of the fly ash by fly ash quality.

  • G-Cam CabinetADS system. True ISO-Kinetic sampling between Economizer and mill air heaters which avoids biasing the sample.
  • One instrument per boiler unit with multiple sample points
  • Heat traced piping between samplers and ducts for smooth material flow with no plugging.
  • System operation constantly monitors sample weight and microwave response, while carefully filling sample tube in the microwave wave-guide to ensure correct density compensation.
  • The duct and cyclone temperatures together with an optional MW signal from plant is used to generate a permissive when to sample during 2 shift operation conditions such as during an oil start-up the system aspirates continuously.
  • Maintenance is generally planned to coincide with a boiler outage, when the instrument has been switched-off for a longer period of time, during which time the instrument is isolated from the duct using the special valves supplied.