Reduced CO2 footprint
with lime kiln technology
Claus Jensen-Holm
Director
Valmet Lime kiln technology center
Valmet lime kiln technology
In July 2013, Valmet acquired an
exclusive license to use FLSmidth’s
lime kiln and recausticizing
business & technology.
The acquisition complements
Valmet’s portfolio as a full-scope
supplier to the pulp & paper
industry
2
October 2014
Valmet Customer Days | Claus Jensen-Holm
Pulp mill
Södra Cell, Värö, Sweden
Valmet lime kiln technology
More than 340 kilns sold
The world’s largest lime kiln – 1,250
tonnes a day
State-of-the art kiln, cooler and
burner technologies
Most efficient kiln technology with
lowest heat consumption
Technology leader in biofuel-fired
lime kiln systems
3
October 2014
Valmet Customer Days | Claus Jensen-Holm
Kiln burner
Valmet technology – leading kiln supplier
Flash dryer (TL)
Cooler (TL)
Lime Mud
Oil, natural gas or
biofuel (TL)
Semi rigid
supports (TL)
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October 2014
Valmet Customer Days | Claus Jensen-Holm
Hydraulic trust (TL)
Getting bigger
Recovery boilers and lime kilns
120 t
DS/24h
1933
15 t/d
1905
1.8 × 22 m
5
October 2014
1,500 t
DS/24h
1976
450 t/d
1991
4.15 × 120 m
2,000 t
DS/24h
1986
600 t/d
1992
4.15 × 95 m
Valmet Customer Days | Claus Jensen-Holm
3,800 t
DS/24h
1996
7,000 t
DS/24h
2006
1,050 t/d
1996
5.0 × 115 m
Ready for next-generation
recovery boilers with
standard kiln components
1,250 t/d
2014
5.5 × 140 m
Reducing fuel consumption by cooler technology
Until 1991:
Unax™
From 1992:
Compax™
3% less fuel
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October 2014
Valmet Customer Days | Claus Jensen-Holm
Now:
FLSmidth Cross-Bar™ cooler
3% less fuel
FLSmidth Cross-Bar™ cooler for large lime kilns
 Consistently high thermal
efficiency
 Product temperature <150 °C
 Rigid mechanical construction
 High reliability & availability
 Low, predictable maintenance.
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October 2014
Valmet Customer Days | Claus Jensen-Holm
FLSmidth Cross-Bar™ cooler for large lime kilns
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October 2014
Valmet Customer Days | Claus Jensen-Holm
FLSmidth Cross-Bar™ cooler for large lime kilns
Step 1.
All bars move
forward
Step 2.
Every other line
moves backwards
Step 3.
Remaining lines
move backwards
9
October 2014
Valmet Customer Days | Claus Jensen-Holm
Valmet biofuel solutions to reduce CO2 footprint
 The lime kiln is the only part of a
modern pulp mill to use fossil fuel
 Reduce fossil fuel consumption by
the right cooler technology
 Replacing fossil fuels with biomass
means pulp mills can be CO2-neutral
 Example of 2 Valmet solutions
– Biogas from gasifier
– Direct wood powder fired system
10
October 2014
Valmet Customer Days | Krister Sjöblom
Biomass gasifier for lime kiln
 Gasification is a well-known solution
with a long industrial heritage
 Gasification can be used to make
mixtures of fuels
 Replacing oil/gas with excess bark
or waste wood gives the best
economical result
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October 2014
Valmet Customer Days | Krister Sjöblom
APP OKI Project
2 × 110 MW Gasification plants for 2 × 1,250 tpd Lime reburning kilns
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October 2014
Valmet Customer Days | Krister Sjöblom
Direct wood powder firing for lime kiln
 New concept based on lessons
learned from previous
installations
 Design focused on a simple
system with highest level of
safety
 Simple to operate
 Able to operate on 100% wood
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October 2014
Valmet Customer Days | Claus Jensen-Holm
Biofuels
Wood powder firing