Lance System

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
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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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15

Documents

Lance System