intelligent sootblowing smart clean - Åbo...
TRANSCRIPT
© C
BW
Cly
de B
erg
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ann W
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l 10.2
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-Rev. 5
Intelligent Sootblowing
–
SMART Clean
March 16, 2018FPK II – Combustion Chemistry II
Åbo Akademi University, Åbo
© CBW Clyde Bergemann Wesel - All rights reserved
Introduction
2
Situation - Typical challenges
� Varying fuel quality and fuel mix
� Fuel with high slagging/fouling tendency
� Inhomogeneous fouling at heating surfaces
� Cleaning based on time-based criteria
� Cleaning of the complete furnace part
� Same time criteria for all the convective heat exchangers
� Cleaning is not based on the demand driven approach
� Unplanned outages caused by slaggingand fouling
6 - Intelligent Sootblowing - SMART Clean
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Process Optimisation & Controls
SMART Clean - intelligent on-load boiler cleaning:
� Combined use of
� Diagnostics – sensor systems measuring process data
� Analysis – software modules analysingand interpreting data
� Decision – decision center making final decision on required cleaning action
� Leads to precise information about:
� WHERE in the boiler is the deposit located?
� HOW intensive has the cleaning to be?
� WHEN is the best time to initiate cleaning?
6 - Intelligent Sootblowing - SMART Clean
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Conventional Boiler cleaning system
4
Cleaning devices
Controls
6 - Intelligent Sootblowing - SMART Clean
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Intelligent Sootblowing - SMART Clean
5
Cleaning devices
Controls
SMART Control - PLC
DC
S
Server PC Software
SMART Clean
Selective and targetedcleaning actions
When?Where?How?
6 - Intelligent Sootblowing - SMART Clean
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Modell-based SMART Clean
Efficiency evaluation of each cleaning sequence by using different, historical and process specific measurements
(e.g. Water-steam cycle; flue gas) depending on time
Analysis of the current condition and detection of optimization potential(e.g. Increase of the live steam flow;
constant turbine power by decreasing the fuel flow)
Adaption of the cleaning time of each sootblower(group)
Optimal cleaning time for each sootblower(group)
Functional principle
6 - Intelligent Sootblowing - SMART Clean
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SMART Clean ISB
Decision
Analysis
Diagnostics
6 - Intelligent Sootblowing - SMART Clean
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8
Diagnostic for Furnace area
� Heat flux measurement
� Wall temperature measurement
� Measurement of furnace exit gas temperature
6 - Intelligent Sootblowing - SMART Clean
© CBW Clyde Bergemann Wesel - All rights reserved
9
.
Diagnostic for Furnace area
Heat flux measurement
Q = ∆ ϑs
λ
∆ϑ
sλ
= T1 – T2 [K]
= Distance [m]
= Heat conductance value m*KW[ ]
6 - Intelligent Sootblowing - SMART Clean
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10
Diagnostic Furnace
Wall temperature measurement
� Large scale analysis of temperature distribution on furnace walls
� Detection of slagging hot spots
� Cleaning strategy is flexibly adapted to slagging status
In cooperation with
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Diagnostic for Convective part
� Weight measurement at the heat exchanger
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Diagnostic for Convective part
12
� Principle of measurement is based on strain gage technology
� Deposits will be registered as weight increase
� Installed at the hangerrods depending on thegeometry of the boiler andthe position of the cleaningdevices
� Specific sensors for local temperature requirements
Weight measurement
6 - Intelligent Sootblowing - SMART Clean
© CBW Clyde Bergemann Wesel - All rights reserved
13
SMART Clean ISB
Decision
Analysis
Diagnostics
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Analysis Convective part
� Thermodynamic Balancing
� Software module for heat exchanger analysis
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Analysis Convective part
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CALCULATED CF
� Compilation of plant specific boiler model
� Calculation of the following values depending on boundary conditions and process data:
� Fuel and flue gas mass flow
� Heat transfer coefficient of each heating surface incl. “Cleanliness Factor”
� Flue gas temperature profile along boiler height
� Boiler efficiency
Analysis Convective part
Cleanliness Factor
CF =Current heat transfer
Reference heat transfer
6 - Intelligent Sootblowing - SMART Clean
© CBW Clyde Bergemann Wesel - All rights reserved
Advantages & Benefits
� Conventional Sootblowing
� Removal of deposits
� Increase of heat absorption
� Prevention of uncontrollable deposits
� Intelligent Online Boiler cleaning
� Conventional sootblowing +
� Higher process flexibility and more flexibility while firing fuel mixes
� Less usage of cleaning media
� Less erosion on the heating surfaces
� Reduced Service and Maintenance
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