Fluidized Bed type CMC
utilizing Coke Oven
Exhaust Gas
CMC (Coal Moisture Control)
Nippon Steel & Sumikin Engineering Co.,Ltd.
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Content
1.Introduce of CMC
Outline and Process flow and Merits
2.CMC’s Drying Method
Comparison of Drying Method
3.Fluidized Bed type CMC
Nippon Steel & Sumikin Engineering’s FB type CMC and Chinese One
4.Experiment for Comparing two FB type CMC
Drying Efficiency and Fluidized Bed Condition
5. Conclusion
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Outline of CMC
Coal Blending
Bin
Coke
Oven
Wet Coal
Approx. 10% Moisture
Dry Coal
CMC
(Coal Moisture Control)
Approx. 6-7% Moisture
Drying Wet Coal and Reducing Coal Moisture
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CMC Process Flow
Heat
Bag Filter
Wet Coal
Approx.10%
Coke
Oven
Coal Blending Machine
Dryer
Dry Coal
Approx. 6-7%
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Global circumstances and Role of CMC
Needs
・Prevention of Global
Warming
・Energy Saving
・Expanding Demand for
Iron ( in Asia )
・ Coke Production
Increase
・Expanding Demand for
Coal( in Asia )
・ Increase the Amount
of Low-Quality Coal
Usage
CMC can meet those needs.
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Merits of CMC
Reference: Merit of Coke Oven Waste Heat-recovery type CMC
(Actual case of coke ovens in Japan when the moisture content is reduced by 4%)
Energy Saving of Coke Oven
（Approx. 340MJ/t-coal）
Coke Quality Improvement
150
(DI15
: Approx.1.7%)
Coke Production Increase
(Approx.11%)
Fifth International Iron and Steel Congress (1986) p312
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Comparison of Drying Method
Nippon Steel & Sumikin
Engineering
STD
CIT
(Steam Tube Dryer)
Wet coal
Air (Exhaust)
FB
(Coal in Tube)
Wet coal
(Fluidized Bed)
Exhaust gas
+
Fine Coal
Air (Exhaust)
Steam
Steam
Wet coal
Air
Coke Oven
Exhaust Gas
Dried coal
＜Cross section＞
＜Cross section＞
Steam
Dried coal
Coal
Steam
Air
Dried coal
Fluidized
Bed
Coal
Air
Coal
Coke oven exhaust gas
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Comparison of Drying Method
Type
STD
・Multi-Tube
・Steam Inside
Drying method
・Indirect Heat
Transfer
CIT
・Multi-Tube
・Coal Inside
・Indirect Heat
Transfer
Heat resource ・Steam
・Steam
FB
・Fluidized Bed
・Direct Heat Transfer
・Coke Oven Exhaust
Gas
lowest cost
Energy Cost
・Need External Heat ・Need External Heat
・Utilizing Waste Heat
Source
Source
lowest cost
・A lot of Machine
Maintenance
Parts (Rotary Drum
Cost
… Fatigue , Wear )
・A lot of Machine
Parts (Rotary Drum
… Fatigue , Wear )
・Box type Structure (
Few Machine )
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Nippon Steel & Sumikin Engineering’s FB type CMC Process Flow
Dry
£ coal
Š
ŠŠ
Y
¼ Wet
Š
Y Coal
Š
No.2
No.2Blower
Ì ÞÛÜ°
Approx.10%
Hopper
Heat resource
for drying coal
is unnecessary
Î ¯Êß°
Stack(new)
ŠŠ
Ë
WBug
Š
o Š
Š
@
Filter
Fluidized
¬Š
Š
®Š
w
Bed
£ ŠŠ
Š
@
Dryer
Coal
Blending
Machine
coal
Gas
@(Š
Š
VŠ
Ý )
º °̧Coke
½Š
F
Oven
No.1 Blower
No.1
Ì ÞÛÜ°
¬coal
Š
Y Š
Š
@
Coal
£Coal
ŠŠ
Y
DryŠ
Approx.6-7%
Š
Ë (Š
Š
ù Š
Ý )
Stack(existing)
@Š
Š
@Š
r Š
KŠ
X
Approx.200℃
Š
¹ Duct
Š
Gas
Approx.60℃
Exhaust Gas
Recycle
Gas
Ø»²
¸ Ù¶Þ
½
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2 Kinds of FB type CMC
・Nippon Steel & Sumikin Engineereing’s FB … Drying coking coal after pulverization.
Fluidized
Bed Dryer
Pulverizer
Coal
Coal
Coal
・Chinese FB … Drying coking coal before pulverization.
Fluidized
Bed Dryer
Pulverizer
Coal
Coal
Coal
Differences (Depending on Grain size)
→ ・drying efficiency ・fluidized condition
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Drying Efficiency
Drying Efficiency = (①Evaporative Latent Heat) / (②Heat Value Required for Drying)
Drying efficiency (%)
90
80
70
60
50
40
0
1
Small Grain Size
2
3
4
5
6
Average grain size (mm)
7
High Drying Efficiency
Nippon Steel & Sumikin Engineering’s FB is Suitable for CMC !
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Fluidized bed temperature (℃)
Fluidized Bed Condition
120
110
100
90
80
70
60
50
40
30
20
10
0
Different Type
Large Particle
1.3mm
5.34mm
8.88mm
13.24mm
Low Temp.
Coal
Small Particle
Coal
0
High Temp.
NSEC
Uniform
Temp.
5 10 15 20 25 30 35 40 45 50 55 60
Time (sec)
Small Grain Size
Few Partial Overheat or Excess Drying
Nippon Steel & Sumikin Engineering’s FB is Suitable for CMC !
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Conclusion
・CMC have three merits.
1.Energy Saving of Coke Oven（Approx. 340MJ/t-coal）
2.Coke Quality Improvement(DI150
15 : Approx.1.7%)
3.Coke Production Increase(Approx.11%)
・ Energy and maintenance cost is the lowest by drying Nippon
Steel & Sumikin Engineering’s FB type CMC to compare to
STD and CIT.
・ Drying coal by FB dryer case,
Small Grain Size
High Drying Efficiency
Few Partial Overheat or Excess Drying
So, drying after pulverization is suitable for FB dryer.
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Thank you!
Nippon Steel & Sumikin Engineering Co.Ltd.
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
C Nippon Steel & Sumikin Engineering 2011, All Right Reserved.