Download - Lance System
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7/31/2019 Lance System
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By
KAVURI NAGA RAJU
Emp No.- 122779
SMS-II Conv (O)
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2
RMHP
LD Slag
Liquid Steel
LD Gas
Ore
SSD Scrap
Ferro Alloys
CRMP Lime
Power
Water
Ar , N2
Water
System
Utilities Plant
Power
Plant
B O F
Oxygen
2
Hot Metal
B F
Utilities Plant
http://images.google.co.in/imgres?imgurl=http://imghost1.indiamart.com/data2/MF/KA/HELLOTD-1769102/loadhaul_lg_250x250.jpg&imgrefurl=http://dir.indiamart.com/foreignexporters/m_earth.html&usg=__Nk2yskzpuisZOgJ2j7dz4eTy_KQ=&h=166&w=250&sz=8&hl=en&start=13&um=1&tbnid=pJVViOJFKCk6cM:&tbnh=74&tbnw=111&prev=/images?q=Heavy+moving+mining+dumpers&hl=en&um=1http://images.google.co.in/imgres?imgurl=http://imghost1.indiamart.com/data2/MF/KA/HELLOTD-1769102/loadhaul_lg_250x250.jpg&imgrefurl=http://dir.indiamart.com/foreignexporters/m_earth.html&usg=__Nk2yskzpuisZOgJ2j7dz4eTy_KQ=&h=166&w=250&sz=8&hl=en&start=13&um=1&tbnid=pJVViOJFKCk6cM:&tbnh=74&tbnw=111&prev=/images?q=Heavy+moving+mining+dumpers&hl=en&um=1http://images.google.co.in/imgres?imgurl=http://imghost1.indiamart.com/data2/MF/KA/HELLOTD-1769102/loadhaul_lg_250x250.jpg&imgrefurl=http://dir.indiamart.com/foreignexporters/m_earth.html&usg=__Nk2yskzpuisZOgJ2j7dz4eTy_KQ=&h=166&w=250&sz=8&hl=en&start=13&um=1&tbnid=pJVViOJFKCk6cM:&tbnh=74&tbnw=111&prev=/images?q=Heavy+moving+mining+dumpers&hl=en&um=1 -
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Delivers Oxygen at a supersonic jet of velocity into
the converter
Made of three concentric Pipes of steel Innermost Oxygen (99.9 % purity)
Middle Inlet Water
Outermost Outlet Water
Mach Number can be as high as 2.5
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Three possible ways of interaction :
1. Reaction with dissolved solutes , etc. directly.
2. Reaction with Fe first to form FeO, which
subsequently reacts with dissolved solutes
(Dominant Reaction).
3. Dissolution of gaseous oxygen into liquid iron as
atomic oxygen.
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Reactions :Stage 1
Fe + O = FeO
FeO + (Si, Mn) = Fe + ( SiO2 + MnO )
Stage 2
Feo + P = Fe + P2O5
FeO + C = Fe + CO
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Number of hoists 2
Length of the lance 20.9 m
Lance diameter 324 mm
Lifting speed range v
0...31 m/min
Emergency lift speed vem 6.13 m/min
Number of Nozzle 6
Blowing Angle
17.5
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There are 15 ( H1 to H15 )Positions for oxygen lance in
SMS 2
Some important Positions :
Pneumatic limit switch position(H2) When Electric
Power Fails.
Lance fixing clamp position (H4) Lance will be
mechanically fixed by the latching device and any
lowering is prevented unless it is manually unlocked.
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Lance Stand by Position (H5) For Exchange of the
lance ( Standby to operation mode).
Home Position (H6)
Normal Parking Position forthe lance.
Lance Converter interlocking position (H9) lance
positioning at or below H9, Converter Cannot be
tilted. (interlock)
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Open oxygen valve position (H10) Ensures flow of
oxygen only within the converter vessel
Oxygen close Position (H11)
During lifting at thisposition oxygen valve will be closed.
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Oxygen Flow Rates ( At 18 Bar )
Max. 600 Nm3/min Norm. 550 Nm3/min
Min. 60 Nm3/min
Nitrogen Flow Rates (For Slag Splasing) ( 17 18 Bar)
Max. 533 Nm3/min
Norm. 500 Nm3/min
Min. 60 Nm3/min
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High Lance Practice
High Iron Content in Slag
Low C Removal at EOB
Early Fluid slag Formation
Moderate P Removal due to Slopping
Slag Slopping
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Low Lance Practice
Low Iron(FeO) Content in Slag Call it as a Dry blow
High C Removal, Low at EOB
Late Fluid slag Formation Poor P Removal
Metal Spitting
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Lance tip puncture
Forged copper tip Gives better thermal conductivity than casted copper tip. ( As
it is requried to keep the lance body temperature as low as possible to protect
from mechanical erosion).
Skulling
One way to achieve a long tip life is to protect it by a fluid slag layer in order to
protect it from any steel adherence.
Slopping
The Height of the lance should be optimum dependind upon the slag condition ,
neither slag should be more fluid nor dry.
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