examples of fuel switching
TRANSCRIPT
Examples of Fuel switching
IGU WOC5 SG5.1 meeting
Tokyo, Japan
April 19ｔｈ, 2007
2
Index
Y steel Co.,Ltd(Ladle pre-heater)
Efficiency improvement with re-generative burner.
Senboku heat treatment Co.,Ltd
Quality and efficiency improvement with combustion and internal pressure control.
Nagahashi dyeing Co.,Ltd(Boiler)
Space saving with compact one-through boiler. Flash steam recovery system
3
1.Y steel Co.,Ltd
Ladle size：φ4,090×3,590ＬLadle capacity：130ｔ(melted metal)temperature：1,000～1,100℃burner：785－Ｐ（200ℓ／ｈ）
×1・・・heavy oil↓
Twin re-generative burnerＴＲＥＧ－1700Ｋ（150m3／ｈ）×1
・・・Natural gas
Temperature Control：manual・・・heavy oil
↓proportional control
specifications
Ladle pre-heater
4
1-1. ladle pre-heater
electrode
Fuel-oxygen burner
Car transfer machine
Re-generative burner 1700Ｋ
Melted metal
Cutter
billet④ continuous casting
burner
move
scrap
① Arc furnace
③ Tundish
ladle（130t/ch）
② ladle pre-heater
1000～1100℃
1000～1100℃
130t/ch
ladle（130t/ch）
tundish
5
1-2. Ladle pre-heater appearance
Heat exchanger Ladle stand and burner
burner
ladle
6
1-3.Comparison with the previous one
previous present
burner capacity 2,070kW 1,700kW
Processing time 3.5h 2.45h
Exhaust gas temp 1,136℃ 263℃
Energy saving base line 57%
Installation cost base line 100,000euros
Annual profit base line 25,000euros
7
2.Senboku heat treatment Co.Ltd
type ： car transfer annealing furnace
capacity ： 120ｔ／ｃｈdimension：4,000Ｗ×13,000Ｌ×3,500Ｈburner ： ＰＬＢ－3ＥＬ×18 ・・・・kerosene
↓
temperature： 600～950℃
ＬＣ－400Ｋ－Ｓ×9・・・natural gas（3-zone impulse combustion）
specifications
The appearance of the furnace
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2-1.Impulse combustion system
Ⓐ
Ⓑ
Ⓒ
Ⓓ50％50％
50％50％
Ⓐ Ⓑ
Ⓒ Ⓓ
100％
0％
0％
100％
Ⓐ Ⓑ
Ⓒ Ⓓcyclecycle
ＯＮ ＯＮ
ＯＮ
ＯＮ
ＯＮ
ＯＮ
ＯＮ ＯＮ
ＯＮ ＯＮ
Typical one Impulse combustion Time table(50%)
①Two position control : stirring furnace atmosphere
②Unique time table : minimizing temperature distribution
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2-2.furnace and burner
Car transfer unit Burner and peripheral devices
10
2-3.Energy saving and high quality
burner
burner
Previous one Present one
steel
Car
piers
steel
Car
Brick walls
Invasion air Invasion air
Pressure control damper
Invasion air Invasion air
X X
①Pressure control damper : preventing invasion air
②removing brisk walls : stirring furnace atmosphere
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2-4.Furnace atmosphere
Previous one
Temperature distribution:50℃
Present one
Temperature distribution:10℃
12
2-5.Comparison with the previous one
previous present
burner capacity 5,400kW 3,600kW
Temp distribution 50℃ 10℃
Energy saving base line 20%
Installation cost base line 170,000euros
Annual profit base line 21,250euros
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3.Nagahashi dyeing Co.,Ltd
specifications
Factory appearance
・boiler : replaceheavy oil・furnace pipe fire-tube boiler:8t/h・One through boiler : 4t/h
Natural gas・One through boiler : 12.5t/h・Flash steam recovery system
・Gas fired dyeing machineSwitching LPG to Natural gas
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3-1.space saving (by 40%)
One-through boiler 2ｔ/h
Oil tank
Fire-tube boiler4ｔ/h
One-through boiler 2.5ｔ/h×5
10
ｍ
10
ｍ
13.8 ｍ 13.8 ｍ
Fire-tube boiler4ｔ/h
One-through boiler 2ｔ/h
Previous one Present one
9.2m
9m
15
3-2.boiler appearance
Previous one Present one
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3-3.previous system
boilerSteam header
Ste
am
eq
uip
men
t
Ste
am
equip
ment
Ste
am
equip
ment
condensate
pressure regulator
Flash steam
2㎏/㎠G
Steam trap
Steam trap
Steam trapcondensate
8㎏/㎠G
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3-4.flash steam recovery system
boilerSteam header
Ste
am
eq
uip
men
t
Ste
am
equip
ment
Ste
am
equip
ment
condensate
pressure regulator
Flash steam
2㎏/㎠G
Steam trap
Steam trap
Steam trapcondensate
Fla
sh
tan
k
8㎏/㎠G
ejector
18
3-5.appearance of recovery system
Pressure pump
Flash tank
Flash steam pipe
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3-6.factory appearance
Under construction Present factory
20
3-7.Comparison with the previous one
previous present
Space saving base line 40%
Energy saving base line 18%
Installation cost base line 500,000euros
Annual profit base line 71,500euros
CO2 reduction base line 602t/year