ENERGY SAVING TECHNOLOGIES FOR STEEL PLANTS
AT
INDIA-JAPAN BUSINESS FORUM FOR ENERGY EFFICIENCY, CONSERVATION AND RENEWABLE ENERGY
07th November, 2019. New Delhi
TABLE OF CONTENT
1. COMPANY PROFILE 2. DRY TYPE MULTI VESSLE ELECTROSTATIC PRECIPITATOR 3. COKE DRY QUENCHING SYSTEM
1. 2019 COMPANY PROFILE
STEEL PLANTS WASTE TO ENERGY ENERGY SOLUTIONS MARINE ENGINEERING AND
CONSTRUCTION
BUILDING CONSTRUCTION AND
STEEL STRUCTURES PIPELINES
NIPPON STEEL CORPORATION GROUP
Pursue synergies and Business developed from steelmaking
2. DRY TYPE MULTI VESSEL ELEECTROSTATIC PRECIPITATOR
Dry type Multi Vessel Electrostatic Precipitator
system
[ Dry MVEP ]
in Blast Furnace Gas Cleaning Plant
LINEUP OF NSENGI SECONDARY GAS CLEANING SYSTEM AT BF
Secondary GCP at BF
Wet type GCP
Dry type GCP
① VS-VS
Filter type
ESP type
ESP type
Slit type
② VS - ESCS
④ Dry MVEP system
③ Bag Filter system
NSENGI deals with all products
related to secondary GCP
BF TRT Secondary GCP Primary GCP
Newly Lineup
※ GCP ( Gas Cleaning
Plant)
※ ESCS™ ( Electrostatic
Space Cleaner Super)
※ TRT ( Top pressure
Recovery Turbine)
※ ESP ( Electrostatic
Precipitator )
FEATURE COMPARISON OF WET TYPE GCP WITH DRY TYPE GCP
WET type GCP DRY type GCP
Environment A large amount of polluted water is generated. “ZERO Liquid discharge”(Drastic reduction in water consumption)
Energy recovery Energy recovery is low. Energy recovery is high (TRT recovered electric energy is greatly up)
Dry type GCP becomes main stream because of Ecological Aspects
FEATURE COMPARISON OF DRY BAG FILTER & DRY ESP
Type
Dry type GCP
Bag Filter ESP
Example Pals jet type Bag Filter system Dry MVEP system
Operation It is necessary to control the temperature of the blast furnace gas at the top spraying water.
No special precautions.
Maintenance Regular filter cloth replacement is necessary ( High costs ).
Normally only maintenance (regular visual inspection) etc.
Space Wide Space is necessity. Compact.
CAPEX and
OPEX
The vessel is numerous ( 18 ~ 20 unit ). Construction cost is high.
The dust collecting vessel is few ( 4 ~ 5 ). Weight is small.
Dry MVEP system is more cost competitive than Bag Filter
PERFORMANCE COMPARISON
Dry GCP is better in Ecological aspect ( no polluted water and higher energy recovery )
3. Saving the installation space
2. Easy maintenance ( only regular visual inspection )
1. High operational stability
CONCLUSION
4. Low CAPEX and OPEX
The reason why we propose the Dry MVEP system compared with bag filter
The latest technology of CDQ (Coke Dry Quenching) System
COKE DRY QUENCHING
As such a high
temperature
OUTLINE OF CDQ
Iron ore
Lime
Coke Oven
Sintering
factory
Blast
furnace
Sintered ore
Cooling process of hot coke
Coke
1000 ℃
Coke
Less than 200℃
Pig
iron
CWQ(Coke Wet Quenching)
Water Quenching
Coal
CDQ(Coke Dry Quenching)
Dry Quenching
Cooling the hot coke in a close space with inert gas/
・Recover the heat to generate the electric Power
・Reduce the emission of dust & gas.
Cooling the hot coke with water / Non–heat-Recovery
Hot coke
OUTLINE OF CDQ
Electric
Power
Generation
1000˚C
Cooled Coke
:200˚C
Boiler
Discharging
Equipment Sub
Economizer
Charging Equipment
Blower
Secondary
Dust Catcher
Primary
Dust catcher
Cooling
Chamber
Pre-
Chamber
Crane
170℃
980˚C Steam
Turbine 130℃
generator
14
Environmental
improvement Improvement of
Productivity at BF
Saving Energy
CO2 Reduction
ADVANTAGES OF CDQ
15
15 © 2019, Nippon Steel Engineering Co., Ltd.
Figure 2: Power production capacity of CDQ
CO2 :36 t/h
CDQ
200t/h
Electric Power
36MW
CO2 : Small
amount
Heavy OilApprox. 12 t/h
Heavy Oil
Firing Boiler
CDQ
BoilerSensible heat of coke
Steam
SteamElectric Power
36MW
SAVING ENERGY & CO2 REDUCTION
Fossil fuel Heavy oil
approx. 12t/h
Electricity
36MW
Electricity
36MW
16
Dust:300~400g/t-coke
CWQ
(Coke Wet Quenching)
CDQ
(Coke Dry Quenching)
Dust:Less than 3g/t-coke
ENVIRONMENTAL IMPROVEMENT
OPEN SYSTEM CLOSED SYSTEM
17
Coke strength after
CO2 reaction (CSR)
2.5% UP
Coke strength after
CO2 reaction (CSR)
2.5% UP
6 kg/t-pig iron
Reduction of
coke ratio
6 kg/t-pig iron
Reduction of
coke ratio
6 kg/t-pig iron
Reduction of
coke ratio
Moisture content
of Coke
Nearly ZERO Waterless
Cooling
gradually
Cooling
gradually
Moisture content
of Coke
Nearly ZERO
Blast
Furnace
Coke quality improvement
※Actual result in NSSMC-group
Quenching with inert gas
Benefit of CDQ
at Blast Furnace Installation of CDQ
Waterless
Drum Index (DI)
1.5% UP
8%
Iron productivity
limit
100 kg/t-pig iron
Injection limit
of pulverized
non-coking coal
Drum Index (DI)
1.5% UP
8%
Iron productivity
limit
100 kg/t-pig iron
Injection limit
of pulverized
non-coking coal Keeping
the coke strength
Increasing of
bony coal
(low quality coal)
ratio of
charging coal
IMPROVEMENT OF PRODUCTIVITY AT BLAST
FURNACE
Profile
190 200 175 180 150 118 110 75 56 Capacity
(t/h)
1988 1987 1974 Operation
Start 2009
280
World’s
largest
CDQ 280t/h