1. Advanced Boiler Control for Biomass/Solid Fuel Boilers
For improved boiler stability and safety, fuel cost efficiency, and environmental compliance,
using Advanced Control and Optimization Strategies and implemented in existing DCSs.
Woodfeeders Short-term Combustion Long-term Combustion
0 h
24 h
Simultaneously Reduces Fuel Costs and Emissions (Particulates, CO2).
Advanced Control of Combustion Air and Gas, Steam Drum Level, and Header Pressure.
Optimization for Multi-Fuel Firing, Air-Fuel Ratios, and Air Distribution.
Combustion Rate Model.
Boiler Master with Load Allocation and Comprehensive Constraint Control.
Burner Management and Optimization.
Chemical Recovery Boiler Throughput, Consumed Air, and Air Distribution Optimization.
Active Control of the Solid Fuel Distribution on the Grate.
Grate Cleaning and Restart Optimization.
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2. Advanced Boiler Control
Harmac No.9 Power Boiler
Hog steam was increased by 60 kpph
(180 -> 240 kpph, with a 450 kpph MCR, with hog fuel moisture of 57 %,
resulting in a reduction of 15 barrels of oil per hour – from 35 barrels per hour)
Port Townsend Paper No.10 Power Boiler
During a manual trial, the ABC technology increased the hog steam by 70 kpph
(140 -> 210 kpph, with a 250 kpph MCR, with hog fuel moisture of 56 %,
resulting in the removal of all 17.5 barrels of oil per hour).
During another trial, the particulate matter emissions were reduced
by 40% (from the permitted value) during the same hog fuel firing rate.
Port Angeles No.8 Power Boiler
During a manual trial, the ABC technology increased the hog steam by 30 kpph
(70 -> 100 kpph, with a 120 kpph MCR, with hog fuel moisture of 60 %,
resulting in the removal of all 8 barrels of oil per hour was removed).
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3. Multi-Fuel Boiler Model and Simulator
for off-line control strategy testing, tuning, checkout, optimization, and for operator training
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4. Advanced Boiler Control CIMExcel Software Inc. Slide 4
Multi-Fuel Boiler Model and Simulator – First Principles and Empirical Data Model
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5. Biomass / Solid Waste - Fuel Boiler Control Loops
Combustion
Rate Model
Boiler Master /
Load Allocation
FDS
Pressure
Setpoint
Furnace
Pressure
Setpoint
Boiler Steam
Temperature
Setpoint
Steam
Drum
Level
Superheater Steam Temperature
Primary
Fuel Master
Auxiliary
Fuel Master
FD Supply
Pressure
Furnace Pressure
Auxiliary
Air-Fuel Ratio
Primary
Fuel Feeders
Feedwater
Flow
Valve
Attemperator
Flow
Valve
FD Fan
Damper
Positioner
ID Fan
Damper
Positioner
Primary
Air-Fuel
Ratio
Burner
Management
and Optimization
Feeder
Profiling
FD Fan
Speed
Controller
ID Fan
Speed
Controller
Primary /
Secondary
Distribution
Auxiliary
Air 1 Lead/Lag
Auxiliary
Air 2 Lead/Lag
Feeder
Distributors
Auxiliary
Air 1
Mass Flow
Auxiliary Fuel
Mass Flow
Auxiliary Air 2
Mass Flow
OF1/2
Damper
Positioners
Feeder Distributor
Speed
Controllers
UG1/2
Damper
Positioners
Feeder
Speed
Controllers
AA1
Damper
Positioner
Auxiliary
Fuel
Valve
AA2
Damper
Positioner
Auxiliary
Fuel Burners
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6. ABC Control System Response to a Load Change
Load Change: 3 minutes ramp down from 100% to 50%, remain at 50% for 5 minutes, ramp up to 100% in 3 minutes.
Steam Drum Level Control: Setpoint is load dependent (high/low level – high/low load).
Header Pressure Control: Setpoint is load dependent (low/high pressure – high/low load).
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7. Combustion Rate Model – Load Variation - Power Boiler Scenario - No Fuel Variation
CRM Inputs (18) and CRM Outputs (bottom right : Auxiliary Fuel Combustion, Primary Fuel Combustion).
All ABC Loops are active. Steam Drum Level Control and Header Pressure Control are load dependent .
CRM - Primary Fuel Combustion (bottom right) confirms that there is no Fuel Variation.
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8. Advanced Boiler Control CIMExcel Software Inc. Slide 8
Combustion Rate Model – Power Boiler Scenario - Load Variation and Fuel Variation
CRM Inputs (18) and CRM Outputs (bottom right : Auxiliary Fuel Combustion, Primary Fuel Combustion).
All ABC Loops are active. Steam Drum Level Control and Header Pressure Control are load dependent .
CRM - Primary Fuel Combustion (bottom right) confirms that there is Fuel Variation.
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