4058 73 da1 001 01 refractory dry out cycle

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34 TPH GI&GL Furnace–SOUTHERN STEEL SHEET CO

LTD – Bien Hoa , VIETNAM

REFRACTORY DRY OUTPROCEDURE AND START UP

ACTIVITY

TECHNICAL SPECIFICATION

Doc. nr. 4058 73 DA1 001

Rev. 01

Pag. 1 of 6

Q U E S T O D

O C U M E N T O

E L E

I N F O R M A Z I O N I I N

E S S O C

O N T E N U T E S O N O

D I E S C L U S I V A P R O P R I E T A ' D I T E N O V A L O I I T A L I M P I A N T I . N E

E ' V I E T A T A L A C O P I A ,

R I P R O D U Z I O N E ,

P U B B L I C A Z I O N E , D I V U L G A Z I O N E E D

U S O , A N C H E

P A R Z I A L E , P E R S

C O P I D I V E R S I D A

Q U E L L O P

E R

C U I E ' S T A T O

P R E P A R A T O , S E N Z A

A U T O R I Z Z A Z I O N

E

S C R I T T A .

34 TPH GI&GL Furnace

SOUTHERN STEEL SHEET CO LTD

Bien Hoa - Dong Nai ProvinceVIETNAM

REFRACTORY DRY OUT PROCEDURE AND START UPACTIVITY

01 KSR HOT TRAIL/RUN PROCEDURE ADDED 19.07.2014

00 KSR First Issue 18.07.2014REV. BY DESCRIZIONE/ DESCRIPTION DATA /DATE

REDATTO/ ISSUED BY CONTROLLATO/ CHECKED BY APPROVATO/ APPROVED BY

KSR AVK MRM






ACTIVITY


Doc. nr. 4058 73 DA1 001

Rev. 01

Pag. 2 of 6

Check before proceeding to Refractory Dry Out Cycle and Hottrial/run:-

1) Cold trail must be done successfully with minimum to maximum strip

thickness and minimum to maximum strip width by bypassing the furnace and

through the furnace.

2) All the rollers must be started in idling mode.

3) Check whether back up power available at site. This we require for safety

point of view for equipments in case power supply fails.

4) Start cooling water supply and ensure that the flow is in healthy condition.

5) Check emergency cooling water supply is available. This is required from

safety point of view for equipments (like heat exchanger of Jet cooler, DFH

hearth roller) in case if main cooling water supply fails or power fails.

6) Required N2 flow should be maintained through all equipments/instruments.

7) Compressed Air pressure switch should be in healthy condition. This is

required to ensure proper working of furnace damper actuator andcombustion blower actuator.

8) RC fan must be in OFF condition and RC fan damper should be in closed

position.

9) Threading valve (Gate Valve) at hot bridle section and snout portion should

keep open for air to flow inside the furnace.






ACTIVITY


Doc. nr. 4058 73 DA1 001

Rev. 01

Pag. 3 of 6

Refractory Dry Out Cycle:-

1) After satisfying all above conditions, start the exhaust fan at approx 30%

speed and open the furnace pressure damper approx 50%.

2) Start Hot bridle heaters, Static heaters and RCS heaters with set point of

100°C in auto mode.

3) On 2nd day increase the temperature to 200°C.

4) On 3rd day start the soaking heaters and maintain 200°C. Increase the

temperature of RCS, Static and HBR to 300°C.

5) On 4th day increase temperature of soaking to 300°C. Increase the


6) On 5th day increase temperature of soaking to 400°C. Increase the


7) On 6th day maintain temperature of 500°C for soaking, RCS, Static and HBR

and hold this temperature for rest of cycle.

8) On 7th day Fire RTF burner and maintain the temperature of 500°C. Increase

temperature of soaking to 600°C.

9) On 8th day maintain the temperature of 700°C for soaking section. Increase

temperature of RTF to 600°C





12) On 11th day fire DFH zone 4 burners and maintain temperature of 900°C.

Maintain the temperature of 900°C for soaking section as well as for RTF

section and hold this temperature for rest of cycle.

13) On 12th day increase the temperature of DFH to 1000°C and hold this

temperature for rest of cycle.

14) At the end of 14th day, refractory dry out cycle will completed.






ACTIVITY


Doc. nr. 4058 73 DA1 001

Rev. 01

Pag. 4 of 6

Summary :

HBRStatic

(Homogenization)RCS (Jetcooler)

Soaking RTF DFH Remarks

Day 1 100°C 100°C 100°CStart of HBR, Staticand RCS heater

Day 2 200°C 200°C 200°CDay 3 300°C 300°C 300°C 200°C Start of Soaking HeaterDay 4 400°C 400°C 400°C 300°CDay 5 500°C 500°C 500°C 400°CDay 6 500°C 500°C 500°C 500°C

Day 7 500°C 500°C 500°C 600°C 500°C Fire RTF burner Day 8 500°C 500°C 500°C 700°C 600°C

Day 9 500°C 500°C 500°C 800°C 700°CDay 10 500°C 500°C 500°C 900°C 800°CDay 11 500°C 500°C 500°C 900°C 900°C 900°C Fire DFH burner

Day 12 500°C 500°C 500°C 900°C 900°C 1000°CDay 13 500°C 500°C 500°C 900°C 900°C 1000°CDay 14 500°C 500°C 500°C 900°C 900°C 1000°C






ACTIVITY


Doc. nr. 4058 73 DA1 001

Rev. 01

Pag. 5 of 6






ACTIVITY


Doc. nr. 4058 73 DA1 001

Rev. 01

Pag. 6 of 6

Start of HOT trial/Run after refractory dry out cycle.

1) Lower the DFH section to 800°C, RTH and Soaking to 500°C. Maintain static

and HBR at 500°C. Put off Jet cooler heater and open the JC damper. Start

RC fan with 10% operating speed.

2) Switch ON all Glow heaters.

3) Seal the snout opening by dipping it into zinc bath. Close the threading valve

at HBR section or any openings in furnace. Once again check all

flanges/covers tighten properly to ensure no leakage from the furnace.4) Start purging of nitrogen (N2) with 3% H2 to achieve require dew point and

O2 level minimum 1 day. This N2H2 purging need to be carried out to remove

air present inside the furnace.

5) After getting required dew point, put off all burners, heaters and N2H2 supply.

6) Bring down the furnace temperature upto temperature suitable for threading.

Start threading of strip (recommended size of 0.25 to 0.3 mm thk X 1000mm

strip width) for CQ production.

7) After completion of threading, close the threading valve and openings.

Ensure the openings are closed properly.

8) Start HBR and static heater at 500°C set point. Put RC fan in auto mode.

Maintain soaking temperature around 700°C and RTF temperature around

750°C.

9) Simultaneously start purging of nitrogen (N2) with 3% H2.

10) After getting require dew point and O2 level in acceptable limit (in ppm), fire

DFH zone 4 burners with excess air to burn hydrogen. Increase the H2%

upto 25%.

11) If strip temperature increases beyond acceptable temperature, then jog the

Strip for few meters to keep the temperature within limits.

12) Keep check dew point and O2 level, and after 25 to 30 min. line can be

started. Set all section/zone temperature at required temperature/settings and

start the production.

4058 73 da1 001 01 refractory dry out cycle

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