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Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
Fluidized Bed type CMC
utilizing Coke Oven
Exhaust Gas
CMC (Coal Moisture Control)
Nippon Steel & Sumikin Engineering Co.,Ltd.
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
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
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
Outline of CMC
CMC (Coal Moisture Control)
Coal Blending
Bin
Coke
Oven
Drying Wet Coal and Reducing Coal Moisture
Wet Coal Approx. 10% Moisture
Dry Coal Approx. 6-7% Moisture
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
CMC Process Flow
Coke Oven
Heat
Wet Coal Approx.10%
Bag Filter
Dryer Coal Blending Machine
Dry Coal Approx. 6-7%
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
・Prevention of Global Warming ・Expanding Demand for Iron ( in Asia ) ・Expanding Demand for Coal( in Asia )
Global circumstances and Role of CMC
・Energy Saving
Needs
・ Increase the Amount of Low-Quality Coal Usage
・ Coke Production Increase
CMC can meet those needs.
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
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 Production Increase (Approx.11%)
Fifth International Iron and Steel Congress (1986) p312
Coke Quality Improvement (DI150: Approx.1.7%) 15
Merits of CMC
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
Coal
Steam
Air
<Cross section>
Steam
Wet coal Air (Exhaust)
Dried coal
Air
Steam
Coal
<Cross section>
STD (Steam Tube Dryer) CIT (Coal in Tube)
Comparison of Drying Method
Wet coal Air (Exhaust)
Dried coal
Air Steam
Wet coal
Coke oven exhaust gas
Dried coal
Coke Oven Exhaust Gas
Exhaust gas +
Fine Coal
Fluidized Bed
FB (Fluidized Bed)
Coal
Nippon Steel & Sumikin Engineering
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
Comparison of Drying Method
Type STD CIT FB
Drying method
・Multi-Tube ・Steam Inside ・Indirect Heat Transfer
・Multi-Tube ・Coal Inside ・Indirect Heat Transfer
・Fluidized Bed ・Direct Heat Transfer
Heat resource ・Steam ・Steam ・Coke Oven Exhaust Gas
Energy Cost ・Need External Heat Source
・Need External Heat Source
・Utilizing Waste Heat
Maintenance Cost
・A lot of Machine Parts (Rotary Drum … Fatigue , Wear )
・A lot of Machine Parts (Rotary Drum … Fatigue , Wear )
・Box type Structure ( Few Machine )
lowest cost
lowest cost
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
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Exhaust Gas
Approx.10%
Heat resource
for drying coal
is unnecessary
Gas
Coal
Coke
Oven
Stack(existing)
Gas Duct
Recycle Gas
No.1 Blower
No.2 Blower
Stack(new)
Bug Filter
Wet Coal
Dry coal
Hopper
Fluidized
Bed
Dryer
Dry Coal
Coal
Blending
Machine
Approx.6-7%
Approx.200℃
Approx.60℃
coal
coal
Nippon Steel & Sumikin Engineering’s FB type CMC Process Flow
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
2 Kinds of FB type CMC
Differences (Depending on Grain size) → ・drying efficiency ・fluidized condition
・Nippon Steel & Sumikin Engineereing’s FB … Drying coking coal after pulverization.
Fluidized Bed Dryer
Coal Coal Coal
Pulverizer
・Chinese FB … Drying coking coal before pulverization.
Coal Coal
Fluidized Bed Dryer
Coal Pulverizer
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
40
50
60
70
80
90
0 1 2 3 4 5 6 7
Dryin
g e
ffic
ien
cy
(%
)
Average grain size (mm)
Drying Efficiency Drying Efficiency = (①Evaporative Latent Heat) / (②Heat Value Required for Drying)
Nippon Steel & Sumikin Engineering’s FB is Suitable for CMC !
Small Grain Size High Drying Efficiency
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
Fluidized Bed Condition
Large Particle
High Temp.
Low Temp.
Different Type
Coal
Small Particle
Uniform Temp.
NSEC
Coal
0
10
20
30
40
50
60
70
80
90
100
110
120
0 5 10 15 20 25 30 35 40 45 50 55 60
Flu
idiz
ed
bed
tem
peratu
re (℃
)
Time (sec)
1.3mm
5.34mm
8.88mm
13.24mm
Small Grain Size Few Partial Overheat or Excess Drying
Nippon Steel & Sumikin Engineering’s FB is Suitable for CMC !
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
・CMC have three merits. 1.Energy Saving of Coke Oven(Approx. 340MJ/t-coal) 2.Coke Quality Improvement(DI150: 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, So, drying after pulverization is suitable for FB dryer.
Conclusion
15
Small Grain Size Few Partial Overheat or Excess Drying
High Drying Efficiency
Copyright©2017 NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD. All Rights Reserved.
Thank you!
Nippon Steel & Sumikin Engineering Co.Ltd.
Nippon Steel & Sumikin Engineering 2011, All Right Reserved. C
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