Maintenance of Galvanizing Furnace furnace

Galvanizing furnace is the mainly fuel productive maintenance free furnace in the industry. The galvanizing furnaces are already earning a living for a with regard to over twenty years. Installing is easy, in addition to servicing price will be reduced its give small maintenance cost and also fully automatic constraint. Short production level, quick temperature reply, Choice of organizes system, quick equipment these are features of Galvanizing furnaces. This equipment is provided more than 250 Galvanizing furnaces worldwide involved L & T in India. Large speed ending fired central heater technologies with gas and maybe oil fired options offer trusted services at the small preliminary price tag along with a really low upkeep price tag.

Normal Checks –

1. Water flow from H/R & Pyrometers.

2. N2 flow in Bearing Blocks & RC fan Jackets.

3. Water Flow in Shaft Sleeve.

4. Rotation of Hearth Rolls.

5. Flame of Burners.

Shut down Jobs – ( Bi-Monthly S/d ) –

1. Bend Hearth Roll Changing.

2. Damper ( W/c & A/c) Sevicing.

3. LPG Filter Cleaning.

4. DPT Cleaning.

5. Comb. & Exhaust Blower Servicing.

6. Jet Cooler Heat Exchanger testing.

7.TDR Roll Greasing.

8. Drop Screen Roll Changing.

9. Entry Seal Maintenance.

10. Leak test of Furnace.

Shut down Jobs – ( Annual S/d ) –

1. RTF & Recuprator Testing.

2. Damper ( W/c & A/c) Overhauling.

3. LPG Gas Train Maintenance.

4. 5” B/f Valve & Zonal B/f Valve Checking.

5. Comb. & Exhaust Blower Servicing.

6. Jet Cooler Heat Exchanger testing.

7. R. C. fan Servicing.

8. NOF Main Recuprator Testing.

9. Shaft Sleeve Pr. testing.

10. All H/R dismentalling & Grinding.

11. Pressure testing of Furnace.

Operation of Furnace –

Furnace Start up –

•Check  leakage from all opening points of furnace using soap solution and ensure no leakage. This step is followed when Shut Down  is observed for more than one day other wise not required. (Use of SENSIT on half monthly basis)

•Start exhaust gas blower.

•Switch on main LPG supply.

•Start combustion air blower for NOX and RTF section.

•Take out all pilot burner of NOX. Section.

•Switch on pilot LPG supply.

•Lighten up all NOX pilot burners & set the flame by adjusting air & gas ratio.

•Ensure entry seal is closed and water cooling supply on.

•Insert all NOX pilot burners in their sockets.

•Give ignition to all pilot burners of RTF section. Confirm whether all RTF

• pilot burners are ignited, if any burner is not ignited take   out that  particular

•burner and adjust it for ignition.

•Switch on power supply of soaking section.

•When temperature of RTF & soaking section is less than 600 degree centigrade,

• keep  Hydrogen supply below 5%.

•When temperature reaches up to  desired level & furnace is ready for line run

•open main valve of NOX section. 

•When temperature rises above 600C increase H2 percentage as required.

•After stopping the line , confirm that the main solenoid valve of NOX furnace is turned off. Also check the valve for leakage.

•Stop total LPG supply.

•Reduce hydrogen to below 3% and continue nitrogen purging for at least one hour.

•Start emergency N2 purging for cooling of Furnace if required.

•Switch off heaters of soaking section.

•Reduce the set point of soaking zone and radiant tube furnace  section as per anticipated duration of time.

•Switch off NOX  combustion blower.

•Switch off exhaust blower when temperature of NOF below 150 *C.

•Switch off jet cooling fans.

•To open the furnace doors start opening soaking top window first to remove any accumulated H2.

•Stop hearth rolls rotation when furnace temperature is below 150 c.

•In case of any doubt or difficulty , consult the unit incharge/shift incharge.

complete this section—————————thank you

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