Intelligent Sootblowing SMART Clean - Åbo Akademiusers.abo.fi/maengblo/FPK_II_2018/ClydeBergemann/X6... · SMART Clean -intelligent on-load boiler cleaning: Combined use of Diagnostics

© C

BW

Cly

de B

erg

em

ann W

ese

l 10.2

007

-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


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?



Conventional Boiler cleaning system

4

Cleaning devices

Controls



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

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



7

SMART Clean ISB

Decision

Analysis

Diagnostics



8

Diagnostic for Furnace area

� Heat flux measurement

� Wall temperature measurement

� Measurement of furnace exit gas temperature



9

.

Diagnostic for Furnace area

Heat flux measurement

Q = ∆ ϑs

λ

∆ϑ

sλ

= T1 – T2 [K]

= Distance [m]

= Heat conductance value m*KW[ ]



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



116 - Intelligent Sootblowing - SMART Clean ISB

Diagnostic for Convective part

� Weight measurement at the heat exchanger


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



13

SMART Clean ISB

Decision

Analysis

Diagnostics



14

Analysis Convective part

� Thermodynamic Balancing

� Software module for heat exchanger analysis






16

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


Cleanliness Factor

CF =Current heat transfer

Reference heat transfer



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




www.clydebergemann.com

Documents

Intelligent Sootblowing SMART Clean - Åbo Akademiusers.abo.fi/maengblo/FPK_II_2018/ClydeBergemann/X6... · SMART Clean -intelligent on-load boiler cleaning: Combined use of Diagnostics