advanced boiler control for biomass/solid fuel boilers
DESCRIPTION
Woodfeeders Short-term Combustion Long-term Combustion. 0 h. 24 h. Advanced Boiler Control for Biomass/Solid Fuel Boilers For improved boiler stability and safety, fuel cost efficiency, and environmental compliance, - PowerPoint PPT PresentationTRANSCRIPT
Advanced Boiler Control for Biomass/Solid Fuel BoilersAdvanced Boiler Control for Biomass/Solid Fuel Boilers
For improved boiler stability and safety, fuel cost efficiency, and environmental compliance,For improved boiler stability and safety, fuel cost efficiency, and environmental compliance,
using Advanced Control and Optimization Strategies and implemented in existing DCSs.using Advanced Control and Optimization Strategies and implemented in existing DCSs.
• 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.
Advanced Boiler Control CIMExcel Software Inc. Slide 1
Woodfeeders Short-term Combustion Long-term Combustion0 h 24 h
Advanced Boiler Control 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).
Advanced Boiler Control CIMExcel Software Inc. Slide 2
Multi-Fuel Boiler Model and SimulatorMulti-Fuel Boiler Model and Simulator
Advanced Boiler Control CIMExcel Software Inc. Slide 3
for off-line control strategy testing, tuning, checkout, optimization, and for operator trainingfor off-line control strategy testing, tuning, checkout, optimization, and for operator training
Babcock & Wilcox Fig 4-12
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0 500 1000 1500 2000 2500 3000
Tf, Gas Film Temperature (degF)
Fp
p,
Ph
ysic
al P
rop
erti
es F
acto
r -
Cro
ssfl
ow
Gas
0 %
5 %
10 %
15 %
20 %
hg vs Pressure
2.78
2.79
2.79
2.80
2.80
2.81
2.81
30 35 40 45 50 55 60
Pressure (bar)
hg
(G
J/T
)
ID Fan (U = 0.05, 0.10, 0.15,,,, 1.0)
(Uo = 1135 RPM, Po = 13.3 inH2O, Wo = 248 Tph)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
W/Wo
P/P
o
Boiler SGS Two Phase Flow
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4
Wr, Riser Mass Flow
SG
S R
ecir
cula
tio
n R
atio
Multi-Fuel Boiler Model and Simulator – First Principles and Empirical Data Model
Advanced Boiler Control CIMExcel Software Inc. Slide 4
Advanced Boiler Control CIMExcel Software Inc. Slide 5
Biomass / Solid Waste - Fuel Boiler Control Loops
Superheater Steam
Temperature
Steam Drum Level
Furnace Pressure
FD SupplyPressure
AuxiliaryFuel Master
PrimaryFuel Master
AuxiliaryAir-Fuel
Ratio
Burner Management
and Optimization
AuxiliaryAir 1
Lead/Lag
AuxiliaryAir 2
Lead/Lag
Auxiliary Fuel
Mass Flow
Auxiliary Air 1
Mass Flow
Auxiliary Air 2
Mass Flow
PrimaryFuel Feeders
FeederProfiling
FeederDistributors
PrimaryAir-FuelRatio
Primary /SecondaryDistribution
Boiler Master / Load Allocation
CombustionRate Model
UG1/2Damper
Positioners
OF1/2Damper
Positioners
FeederSpeed
Controllers
Feeder Distributor
SpeedControllers
AA1Damper
Positioner
AA2Damper
Positioner
AuxiliaryFuel Valve
FeedwaterFlow Valve
FD FanSpeed
Controller
FD FanDamper
PositionerID FanSpeed
Controller
ID FanDamper
Positioner
AttemperatorFlow Valve
Auxiliary Fuel Burners
FDSPressureSetpoint
FurnacePressureSetpoint
Boiler Steam Temperature
Setpoint
Advanced Boiler Control CIMExcel Software Inc. Slide 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).
Advanced Boiler Control CIMExcel Software Inc. Slide 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.
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.