Oxygen Lance System

Oxygen lance system

• Oxygen lance is critical equipment for the steel making process with top-blown oxygen converters. This system is composed of lance proper, up-and-downing cart, lance replacing equipment, lance transverse frames, lance counter weight, guide, position indicator, valve chamber and connecting hose etc

• Each converter is equipped with two water cooled oxygen lances, which can be replaced in a short time

The oxygen lance is installed on the up and downing cart along with which the lance goes up and down. This cart is provided with a double coiler transmission system and a counter weight, in case the oxygen lance is in failure the lance could be lifted to a safe place in a short time.

Overall length of the lance (including lance proper and the injector) is: - 15.41 m. Maximum up-and-downing travel: - 12.5 m. Oxygen supply capacity: - 100-120 m3/min. Oxygen supply pressure:-0.9-1.5 mpa. Water flow:-80m3 /h. The lance proper is of a three layer tube-in-tube structure with the inner pipe (§105*5) for oxygen, the inter pipe (§133*5) for cooling water supply and outer pipe (§159*7) for cooling water drainage The up and downing cart can travel at a high speed and a low speed which is 4m/min and 6m/min respectively. it is driven by a DC motor

Transverse mechanism for lance replacement can travel at a speed of

1.2m/min within a distance of 1342mm.

There is a 3t hanging crane in the high aisle of the convertor workshop building at an elevation of 38.5m

Oxygen lance

The oxygen lance is made up of mild steel having copper tip length 215mm.

Diameter of the lance tip is 159mm Lance tip consists of four converging and

diverging nozzles for oxygen to pass through. Diameter of each nozzle initial: 21.7. Outer: 29.2. Angle:120

CONVERTER TILTING SYSTEM

• The converter is of normal mouth, symmetrical cap, barrel shaft and intercept conic-type bottom. Connection of bottom and shaft is removable to facilitate converter repairing.

• There are three sets of ball hinge bearing equipments which are equally apaced on the mantle ring with an included angle of 1200.The converter proper is hung on the bearing equipment. In addition, clips are provided above and under the trunions as well as the tapping hole. Therefore the converter proper is well held during tilting operation

SPECIFICATIONS:

No of motors -4Motor power - 22.4 Motor speed-700 rpmMotor voltage- DC 220 VGear ratio-98.769Brake-4 No’sBrake motor power-330 WVoltage- AC 415 WTotal no of gear boxes-4 no’sForward direction-0.2 rpmReverse direction-0.7 rpm

Lubrication oil system Type – XHZ:635 Make : Taiyuan No of motor : 2 no’s No of pumps : 2 no’s Flow rate : 63 L/min Pressure rating : 0.5 mpa Motor power :2.2 kw Lub oil cooler : water cooled Oil filters : return &pressure Heat exchanger – Type of lubricant : SAE 320

• Speed of pump : 960 rpm• Cooling water temp : <350c• Cooling water pressure: <0.4 mpa• Water coolant consumption : 8m3/h• Volume of tank : 1.25m3

• Filter precision : 0.12 m

CONVERTOR FLUE GAS CLEANING FACILITIES:

• GCP EQUIPMENTS  • VENTURI• GRAVITY WATER SEPARATOR• 90 OBEND WATER SEPARATOR• CYCLONE SEPARATOR• DEDUSTING BLOWER DETAILS• ID-FAN

TECHNICAL PARAMETERS OF BOF - GCP EQUIPMENTS

• Dust concentration of Gas : 100 – 150 gm/m3

• Composition of gas : Co – 86%, Co2 – 10 %, others – 4%

• Gas flow : 8750m3/hr (avg), 17500m3/hr (max)

• Temperature of Gas at inlet of GCP :850 oC

• TO ID FAN

• TO SLURY THIKNER

• GAS FLOW

• WATER SEAL 1

• WATER SEAL 2

• WATER SEAL 3

1. FIRST OVERFLOW VENTURI

2. GRAVITY WATER SEPARATOR

3. SECOND ADJUSTABLE VENTURI

4. 90O BEND WATER SEPARATOR

5. CYCLONE SEPARATOR

• 2 • 4

• LINE DIAGRAM OF GAS CLEANING SYSTEM

• WATER SUPPLY

• WATER SUPPLY

• 1 • 3 • 5

• Inlet water for 1st venturi

• gas duct

• Outlet cooling water header of duct

• Overflow 1st venturi

• Venturi shell cooling water inlet

• 1st Overflow venturi connected to flue gas duct

• I/L OF 2ND ADJUSTABLE VENTURI

• Manually operating handle

• Opening adjustment gear

• Lever for operating manuals

• Inlet water line for 2 nd adjustable venturi

• Inlet water header

• Inlet water supply line

• Bottom of water separator

• Water slurry pipeline connecting to water seal

• 1st Venturi outlet

• Gravity water separator

• Connecting to 2nd venturi

• Gravity Water Separator connecting 1st venturi & 2nd venturi

• CYCLONE SEPARATOR

• 90O WATER

SEPERATOR

• CONNECTION LINE TO CYCLONE SEPERATOR

• 2nd adjustable ventury

• Flue duct connecting to I D fan

• Cyclone separator outlet

Ventury-1

Gas outlet temp. 70 0 cWater flow 100 m3/hr Gas speed 50 – 60 m/secContraction section length 3.2 mDia of inlet pipe 1.32 mAngle of contraction 23 0

Dia of inlet pipe of expansion section 0.860 mLength of inlet pipe 3.0 mAngle of expansion 7 0 Dia of Throat 0.5 mLength of throat 0.5 mOverall length of First Ventura 6.7 m

VENTURI-2

Gas temp. 63 0 c Water flow 50 m3/hr Gas speed 10 m/secSection of inlet pipe 0.73 x 0.8 mAngle of contraction 25 0

Length of Contraction section 0.86mSection of outlet pipe 0.73 x 1 mAngle of expansion 7 0

Length of expansion Section 3.1 mDimension of the rectangular throat 0.35x0.6 moverall length of the second venturi 4.55 m

2. GRAVITY WATER SEPARATOR

Gas temp 63 0 cGas speed 5 m/secDia of inlet pipe 0.86 mDia of outlet pipe 0.92 mCross section 1.5 x 1.5 m

3. 90O BEND WATER SEPARATOR

Gas temp. 63 0 cGas speed 10 m/sec Cross section of inlet 1 x 1.2 mCross section of outlet 1.2 x1.2 mCross section of water separator proper 1 x1.1 m

4. CYCLONE SEPARATOR:

Gas temp. 63 0 c water flow 5 m3/hr Gas speed 13 to 15 m/secDia of the dewaterer 2.2 mHeight of the dewaterer 7.7 m

5. DEDUSTING BLOWER DETAILS :Blower discharge Capacity 700 m3/minBlower speed High 2880 rpm, low 750 rpmMotor Power Rate 500 Kw Flaming Stack Dia (with burner @top) 920 x 8 mm thickness Height of stack 70 m

Technical parameters of ID fanBlowers – 2Nos.Model : D700 – 19, centrifugal blower, Q = 700m3 / min Inlet medium : Converter gasTemperature of inlet medium : 630CDensity of inlet medium : 0.868kg/m3Flow rate of medium : 42000m3/hrHigh Speed : 2895 rpmLow Speed : 750 rpmShaft Power : 440 KWDust content : 150 mg/m3

• The oxygen supply facility in the steel making plant includes the pipe lines and the valve sets.

• The oxygen pipe for converter is equipped with manually operated shut off valve, pneumatic quick-stop valve for emergency, main pipe flow meter and bleeding valve

• The average oxygen consumption is 2980cum/h and the maximum is 6988cum/h.

• oxygen blowing pressure is 12-16 bar for the converter and 3 bar for the small users

• The maximum nitrogen consumption is 4600 cum/h and the pressure is 0.5-0.7 mpa

• The flow meter is provided with local display unit to monitor the instant and accumulative flow. Oxygen main filtering unit is equipped to prevent mechanical impurities going into the flow regulating valve which may lead to an accident. The oxygen after filtering will go separately to the lance of the converter for blowing operation• The oxygen pipe for the fragmentary users in workshop will be picked up from the main pipe of the workshop. a valve block is provided on the platform to reduce the pressure from 1.6mpa to 0.2mpa.the pipe is provided with filtering unit before and with quick stop valve, bleeding valve and flow meter after the pressure regulating valve block. Local displaying instruments are equipped for monitoring pressure and flow. manually operated shut off valve is provided

SKIRT

• SKIRT: Skirt is a hood which is used to collect the gases which

are evolved during the steel making process in LD convertor

MOTOR SHAFTBRAKE DRUM

GEAR BOX

COUPLINGCOUPLING GEAR BOX-2

COUPLING

TURN BUCKLE

CAM

SHEEVESHEEVE

ROPE

COUNTER WtCOUNTER Wt

ROPE

TURN BUCKLE

PULLEY PULLEY

SKIRT

PLUMBER BLOCK

PLUMBERBLOCK

Skirt jacket line diagram

Water circulating in this jacket 20 m3/hrand pressure is 3 kg/cm2

TECHINICAL SPECIFICATION:

•MOTOR-7.5 kw

•speed-948 rpm

GEAR BOX:

•Speed ratio-1:25

•Type of gear-Helical

BRAKE:

•Dia of braking pulley-200mm

•braking movement- 180-315 Nm

MASTER CONTROLLER:

•Speed ratio-5.

•Lifting weight-10 ton.

•Dia of driving wheel-700mm.

•Rotation angle of balance rod- 74 0 c•Strike stroke-450 mm.

•Lifting speed-3m/min.