XPlus Combustion Systems
The Xplus Combustion System is a new standard for boiler equipment upgrades. It fully integrates the burner with state of the art monitoring and controls. Throughout the entire development process, the burner design has included the requirement for repeatable, balanced and optimum fuel and air flow control. The result is a high quality burner that achieves and maintains overall fired equipment energy efficiency and low emissions. Most importantly, boiler owners are offered a single source for engineering, manufacturing and field commissioning responsibilities that is unrivaled in the industry.
Capacity – 40 MMBTUH – 150 MMBTUH
Fuel – Natural Gas, #2-#6 Oil, Specialty Fuels
NOx Levels – 30 PPM for Natural Gas
Turndown – 10:1 for Natural Gas; 8:1 for #2 oil
Recommended Boiler Type – Watertube
Recommended Uses (commercial or industrial) – Industrial
BurnerMate Universal Combustion Control: Fully metered combustion control strategy with oxygen trim and variable speed fan-based combustion air flow control is used. Any deviation from the required Oxygen set point resulting from changes in fuel stoichiometry, atmospheric conditions or boiler resistance, is automatically acknowledged and corrected, maintaining the highest fuel economy possible.
Low-Fire Fuel Changeover: Permits fuel transfer without requiring a burner shutdown and purge.
Enhanced Boiler Safety: Flue gas oxygen and temperature monitoring protects against excessive flue gas temperature and incomplete combustion.
Single Burner: Firetube / Watertube Boilers or HTHW Generators
Fuel: No. 2 through No. 6 and/or Natural Gas (consult factory for special or waste fuels)
Heat Input Ranges: 15 to 100 mmBtu/hr
Natural Gas: As low as 30 ppmc without FGR
No. 2 Fuel Oil: 100 ppmc (maximum 0.01% FBN) or less without FGR
No. 6 Fuel Oil: 300 ppmc (maximum 0.30% FBN) or less without FGR
Note: NOx performance is furnace geometry and heat release rate dependant. Lower NOx emissions are attainable with the application of FGR. CO emissions are less than 100ppmc at all firing rates (exclusive of short circuiting).
Any Fuel: 1.5 - 2.5% Excess O2, 50 - 100% Firing Rate (exclusive of “tramp” air)
Electrical: 80% KW Reduction, @ 40% Firing Rate
Turndown: 12:1 on gas firing; 10:1 on oil firing
Ramp Rate: 200% per minute
Back-Up Fuel: Oil or gas may serve as either the backup or supplemental fuel on simultaneous fuel firing applications
Natural Gas: 2 - 5 psig (at Gas Manifold Inlet)
Fuel Oils: 75 - 110 psig (No. 2 through No. 6 at Atomizer Coupling Block inlet)
Atomizing Media: Nominally 20 psi higher than fuel oil pressure
Note: Consult factory for available pressures outside of the ranges given
Burner Control & Monitoring
Firing Rate: BurnerMate Universal Fully Metered Combustion Control with Oxygen Trim and Variable Speed Fan Combustion Air Flow Control
Oxygen Sensor: Model “ZP” In-Situ Sensor, reliable zirconia oxide detector
Monitoring: SCADA/Flex Remote Monitoring and Control System
Controller: PCC-III Multiple Loop Controller
Instruments: Standard and optional equipment available
Low Emissions Design: Gas tube injectors and atomizer sprayer plate produce stable, staged, low temperature fuel and air combustion.
Stable Combustion: Center-fired gas, or very fine fuel oil droplets are ignited in the Stabilizing Combustion Zone. This feature produces outstanding flame stability during load changes and at very high excess air levels.
Energy Efficient: Low electrical consumption is obtained by variable speed fan control with a Variable Speed Drive (VSD). When required, pinpoint injection of Flue Gas Recirculation (FGR), via the FGR Injection Plenum achieves the required NOx emissions with reduced FGR flow. Variable speed FGR Fan control is used for additional energy reduction.
Exceptional Turndown: The combustion air plenum with inline characterized damper are dynamically modeled to assure exceptional turndown and balanced cross-sectional air flow.
No Refractory Maintenance: The burner throat is a high temperature metal. Custom refractory brick installation or maintenance are not required.
Free-Floating Design: Minimizes differential expansion imposed stresses.
Locked Design: No moving parts or adjustments necessary.
Recessed Plenum: Minimizes atomizer length and withdrawal clearance requirements.
Atomizer Coupling Block With Disengagement Safeties: Protects operating personnel from hot oil or steam discharges.
Integrated Primary Flow Elements: Integral combustion air, fuel gas and FGR measurements are used as the basis for combustion control. The integral FGR injection plenum allows independent measurement of combustion air and FGR flows.
Minimized “Hysteresis” Induced Control Errors: A direct-coupled damper / actuator is used. Damper linkage is not required.
Optimum Combustion Air Flow: VSD control of the FD Fan allows trimming of fan speed to exactly meet field conditions, thereby eliminating the need for fan over sizing, damper “short-stroking” or linkage adjustments.