SEKAM^® Carbon-in-ash monitors are used to automatically determine the Carbon content of fly ash in coal fired power plants and other major utilities, and is an important consideration for combustion efficiency as well as ash marketing.

The presence of unburned Carbon in fly ash has shown to be a function of boiler design, coal quality, coal grinding mill activity and the heat release rate of the fuel being burnt.

In applications worldwide SEKAM^® units are automatically monitoring trends in Carbon levels from today's modern coal fired boilers and plays an important role in the improved efficiency of the total combustion process.

Stage 1 - Initial Start up

Initially the isolating valve opens, the educator is on, the flue gas/ash is recirculated from the duct to SEKAM^® back to the duct thus removing any dormant ash.

Stage 2 - Ash Collection

Isolating valve is closed. Ash is continuously drawn to the cyclone, disentrained and collected in the measuring column.

Stage 3 - % Carbon

Ash level continues to build making high level probe. At this stage the capacitance across the electrodes is measured and the % carbon value computed.

Stage 4 - Ash Discharge

Isolating valve opens and the discharge fluidisation assembly is initiated. Ash level falls below the high level probe and is conveyed back into the flue gas duct.

Proven over an extended period of test and development, offers:

• A regular, accurate signal, correlating closely to results obtained by conventional Carbon-in-ash analysis by LOI method.
• Once set up it requires no complicated or regular re-calibration or maintenance.
• Boiler combustion optimisation can be significantly improved.
• Operational status of plant items such as pulverising mills can be detected.
• Saleability of ash with low Carbon content can be monitored where appropriate
• Return on investment recovery time is consequently short due to improved boiler efficiency.