Combustion Control Systems

Bristol Babcock Controls Oxytrim In-Situ Oxygen Probe Systems have been developed to monitor partial pressure (volumetric content) of oxygen in a mixture of gases (whether as free oxygen or in equilibrium). Typical applications are:

-Monitoring Oxygen (excess air) to optimise combustion in Boilers, Furnaces, Kilns, etc. to conserve fuel and reduce atmospheric pollution

-Monitoring Oxygen (in ppm / ppb) in gas generators e. g. in Nitrogen, Argon, endo/exo gas, etc.

-Carbon potential in metallurgical furnaces, e.g. gas carburising, carbonitriding, hardening, sintering

Efficieny gains in plant operational costs have been achieved in numerous plants:

•Improved fuel consumption
•Automatic on-line control - reduced operating costs
•Rapid response closed loop system - boosts quality control
•Control precision - reduced conditioning and downtime, fewer burnouts and longer furnace life
•Simple and easy to install-rapid capital outlay recovery
•4 Models available - probe length 150mm to 2metres
BAT Ambient Air to 400^oC
BLT 350^oC to 700^oC
BST 600^oC to 1100^oC
BHT 1000^oC to 1400^oC

Probe construction is robust to withstand harsh environments. Probes are virtually maintenance-free and provide highly accurate control of furnace atmospheres. Additional benefits are faster furnace cycles with corresponding fuel economy.

Monitor/Controller portable unit is a handy aid for combustion engineers and maintenance teams. The fixed monitor/controller may include a recorder for continuous display of oxygen content and furnace temperature. Correctly used, this is invaluable for establishing preventative maintenance and avoiding costly overhaul programmes. An Explosive Mixture Present feature is included as standard to warn of plant component failure and for improved operator safety.

Trim Pack is an air or fuel line actuator. Air line actuator VA is included between the main modulating damper and either the continuous air damper, process gas generator or other regulating device. Fuel line actuator VF is fitted into the fuel or process gas train and bypasses the existing valve. No additional wiring required, the trim pack power is provided by the monitor/controller.

Umbilical Cable links the probe and monitor/controller and is fitted with all necessary connectors.

Bristol Oxytrim Systems are self-contained; they do not involve modification to existing plant wiring. All units are readily installed by operating staff or maintenance teams - no special calibrating equipment or sampling lines are required.

Bristol Oxytrim oxygen probes are designed and manufactured by Bristol Babcock Controls NZ for boilers, kilns and furnace installations.

Oxytrim can accommodate fuel temperature, pressure, specific gravity, viscosity and calorific value combustion variables via continuous on-line closed-loop control thereby eliminating fuel wastage and environmental pollution.

Oxytrim can be tailored to meet particular plant configuration and control installations for most furnace, kiln and boiler oxygen measurement and control applications.