Carbon in Ash Monitor (G-CAM)
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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.
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One calibration would be applicable to a boiler. Microwave measurement coupled with density compensation results in excellent measurement accuracy.
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Superior availability. An EPRI report from Gaston plant in Alabama clearly demonstrates the superior performance of the recently revised technology at better than 90 % measurement availability.
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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.
The 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.
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ADS system. True ISO-Kinetic sampling between Economizer and mill air heaters which avoids biasing the sample.
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One instrument per boiler unit with multiple sample points
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Heat traced piping between samplers and ducts for smooth material flow with no plugging.
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System operation constantly monitors sample weight and microwave response, while carefully filling sample tube in the microwave wave-guide to ensure correct density compensation.
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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.
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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.