Energy Saving Technology for Iron & Steel Making Process
Transcript of Energy Saving Technology for Iron & Steel Making Process
Energy Saving Technology for
Iron & Steel Making Process
SPCOSPCO ChronologyChronology
April 2001 Established with integration of the iron&steel plant Sales Divisions of NKK, SHI and Hitz
April 2002 Consolidated the three(3)companies Engineering Divisions of the iron&steel plant and equipment
April 2003 Consolidated the Sales Department of KHI’s iron&steel plant business
April 2004 Consolidated the Engineering Division of KHI’s iron&steel plant business
Corporate ProfileCorporate Profile
● Established: April 01, 2001
● Capital: Japanese ¥ 1,995 million
approx. US$ 19 million
● Employee: 280 (as of April, 2006)
● Headquarters: Yokohama, Japan
Main productsMain productsIron making and smelting furnaces, Sintering machine, Continuous caster, Rolling mills, Strip processing line, and Others.
Almost all the steel making facilities can be supplied by Steel Plantech.
Energy Saving Technology Energy Saving Technology forfor
Iron & Steel making ProcessIron & Steel making Process
Iron & Steel Making Process FlowIron & Steel Making Process Flow
Iron ore Coal
Sintering plant Coke oven
Pig iron
Blast furnaceCrude steel
Basic oxygen furnace
Secondary refining
Continuous caster
Slab
Semi-finished products
Bloom
Beam blank
Raw material yard
Lime stone
Applicable Applicable SPCOSPCO’’s s Technology for CDMTechnology for CDM
Process Technology
- CDQ (Coke Dry Quenching Process)Coke oven
- Coke oven gas recovery
Sintering machine - (WHRS) Waste Heat Recovery System
- TRT (Top pressure Recovery Turbine system)Blast furnace
- Pig iron de-[P] & de-[S]
Rotary kiln - Sponge iron kiln heat recovery system
Basic oxygen furnace - OG (Oxygen converter Gas recovery system)
Electric arc furnace - Electric arc furnace energy saving
Lime calcining kiln - High efficiency lime calcining kiln
Rolling mill - Regenerative burner system
Technology for CDMTechnology for CDM
CokeCoke [ CDQ ][ CDQ ]: Coke Dry Quenching System: Coke Dry Quenching System
BFBF [ TRT ][ TRT ]: Top pressure Recovery Turbine System: Top pressure Recovery Turbine System
BOFBOF [ OG ][ OG ]: Oxygen converter Gas Recovery System: Oxygen converter Gas Recovery System
RollingRolling Regenerative Burner SystemRegenerative Burner System
CCokeoke DDryry QQuenchinguenching ProcessProcess[ [ CDQCDQ ]]
Concept of CDQ ProcessConcept of CDQ Process
00
Hot coke
PrePre--chamberchamber
Cooling chamberCooling chamber
Dust
Dust catcher Boiler
Gas circulation blower
Quenched coke
Steam generated
00
Hot coke
PrePre--chamberchamber
Cooling chamberCooling chamber
Dust
Dust catcher Boiler
Gas circulation blower
Quenched coke
Steam generated
Material & Gas Balance Sheet For Reference
CDQ
Coke bucket hoisting crane
Conveyor
Dust catcherBoiler
Air fanMultiCyclone
Gas cooler
Gas bleeder line
CDQChamber
Hot coke950~1050 ゜C
Quenched coke≦180゜C
Circulating gas1300~ 1400 Nm3/t・coke140~160゜C
900~980゜C
160~170゜C
Flue
Circulating gas blower
Steam generated550~600 kg/t
Coke bucket
Coke car & Coke bucket
APSDischarging device
Charging device
Dust cooler
CDM Credit by CDQ ProcessCDM Credit by CDQ Process
0
500
1,000
1,500
2,000
2,500
3,000
75 100 125 150 175 200
0
50
100
150
200
250
300
CER
( k$/
y )
C DQ
Prod
ucti
on (
k t- c
oke/
y )
C O2
Emi s
s ion
Red
ucti
o n (
k t-C
O 2/y )
P ow
er G
e ner
a ti o
n ( G
Wh /
y )
CDQ Capacity ( t/h )
Annual Availability: 95%
Grid Emission Factor: 0.558 t-CO2/MWh
Value of CO2 Credit: 10 $/t-CO2
TTopop--pressure pressure RRecovery ecovery TTurbine Systemurbine System
Blast FurnaceBlast Furnace
Raw material charging system
Blast furnace
Hot stove
Granulated slagsystem
Gas cleaning system
Comparison Table Comparison Table betweenbetween DryDry--type & Wettype & Wet--typetype
Wet Type Dry Type
BF Inner Volume:1,500 m 3
BFG Volume:194 kNm 3/h
Top Pressure:2.0 kg/cm 2G
Inlet 1.70 kg/cm 2G 1.90 kg/cm 2GTurbinePressure Outlet 0.10 kg/cm 2G 0.10 kg/cm 2G
Turbine InletTemperature
60 ゜C 140 ゜C
Power generated 4,700 kW 6,300 kW
PC
G Wet-type Dust Collector
PC
G Dry-type Dust Collector
BFDC
SV
Turbine Generator
CDM Credit by TRT ProcessCDM Credit by TRT Process
0
200
400
600
800
1,000
1,500 2,000 2,500 3,000 3,500
20
40
60
80
100
120
CER
( k$ /
y )
C O2
Emi s
s ion
Red
ucti
o n (
k t-C
O 2/y )
P ow
er G
e ner
a ti o
n ( G
Wh /
y )
BF Inner Volume ( m3 )
Annual Availability: 95%Grid Emission Factor: 0.558 t-CO2/MWhValue of CO2 Credit: 10 $/t-CO2BF Productivity: 2.0 t/m3/d BF Gas: 1550 Nm3/t
Oxygen Converter Gas Recovery SystemOxygen Converter Gas Recovery System[ OG System ][ OG System ]
Iron & Steel Making Process FlowIron & Steel Making Process Flow
Iron ore Coal
Sintering plant Coke oven
Pig iron
Blast furnaceCrude steel
Basic oxygen furnace
Secondary refining
Continuous caster
Slab
Semi-finished products
Bloom
Beam blank
Raw material yard
Lime stone
Basic Oxygen FurnaceBasic Oxygen Furnace
O2 Lance
Concept of OG System Concept of OG System
Converter
Skirt
Hood
Gas cooler
Dust Collector
Mist separator Flow meter
Induced draft fan
Stack
Three way valve
To gas holder
Water sealed check valve
By-pass duct
Operation Pattern of OG SystemOperation Pattern of OG System
TimeTime
Blowing Period
Tap to Tap
Gas Component
Gas FlowGas Flow
CO-rich Air CO-richCO-richAir CO2+N2 CO2+N2 CO2+N2
No-blowing Period
Operation Pattern
Gas Relief Recovery RecoveryGas Relief
CDM Credit by OG ProcessCDM Credit by OG Process
0
500
1,000
1,500
2,000
2,500
500 1,000 1,500 2,000 2,500
0
50
100
150
200
250
CER
( k$ /
y )
C O2
E mi s
s io n
Re d
u cti
o n (
k t- C
O 2/y )
P ow
e r G
ene r
a tio
n ( G
Wh/
y )
Crude Steel Production ( kt / year )
Grid Emission Factor: 0.558 t-CO2/MWhValue of CO2 Credit: 10 $/t-CO2Gas Recovered: 100 Nm3/t-steelOG Gas Calorie: 2000 kcal/Nm3
Regenerative Burner Regenerative Burner for for
Reheating FurnaceReheating Furnace
Combustion System with Conventional BurnersCombustion System with Conventional Burners
from Combustion Air blower
Exhaust Gas 300゜C
FuelBurner
Heated MaterialHot Furnace Gas 1,350゜C
Exhaust Gas1,000 ゜C
Dilution Air
750 ゜C
Recuperator
to Exhaust Gas Blower
Preheated Air 500 ゜C
1,050゜C25゜C
Concept of Regenerative BurnerConcept of Regenerative BurnerBurner-A(burning)
Burner-B(regenerating)
FurnaceMain Burner
Pilot Burner Regenerator
Exhaust Gas150 ゜C
Preheated Air1,150 ゜C
Switching Valve
to Exhaust Gas Blowerfrom Combustion air Blower
Heated Material
(every 30 seconds)
Comparison betweenComparison betweenRegenerative & Conventional Burners Regenerative & Conventional Burners
Burner Type
Regenerative Conventional
Rolling temperature 1050 - 1200 1050 - 1200
Combusted gas temperature ≧ 1350 ≧ 1350
Type of Recuperator / RegeneratorHoneycomb- or Ball-shaped Ceramic type
Metalic tube type
Dilution Air NA Necessary
Gas temperature of recuperator inlet 1250 ≦ 850
Preheated combustion air temperature 1150 500 – 600
Gas temperature of recuperator outlet 150 250 - 350
10 - 15 % fuel saving compared to modern conventional burner system