bert uneken, field engineering manager ruben · pdf file- poor or no flame signal fg firing t...
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Bert Uneken, Field Engineering Manager Ruben Kranenburg, Technical Support
Main Burner
Main Reaction Furnace Design
LMV Burner WHB connection Checker wall
/ Choke ring
Residence time section
Man way Temp. Measurement
View ports
Burner / Furnace connection
Weather shield Weather shield
Refractory Lining
0
20
40
60
80
100
120
0,00
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4,00
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9,00
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11,0
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12,0
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15,0
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16,0
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17,0
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19,0
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20,0
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21,0
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22,0
0
0,00
1,00
2,00
3,00
5,00
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Time in hr
dry-out Main burner type155 Natural Gas / excess air
Total air flow x 100 Nm3/hr
Total NG flow x 10 Nm3/hr
Delta P burner /10 mBarg
Temperature x 10 deg ºC
40 deg /hr
Start-up and Dry-out Clean Unit Open the WHB vent to atmosphere
Refractory Lining
Start-up and Dry-out Clean Unit Air dry by use of air blower temperature (70°C) Purge system with nitrogen Start the main burner at 5 to 25 % of max fuel gas load
Burner pressure drop approx 25 mmWC
After ignition: drop fuel gas as low possible / increase combustion air
After 15 to 30 minutes : stop burner, check temperature curve (fast rise and drop indicates flue gas temperature)
Follow the temperature curve for dry out - TAKE YOUR TIME At approx 800°C change the ratio to sub-stoichiometric
conditions
Start-up and Dry-out under Sulphur Conditions
Open the WHB vent to atmosphere Air dry by use of air blower temperature (70°C) Purge system with nitrogen Start the main burner 15 to 25% of max fuel gas
load Use Air / gas ratio at sub stoichiometric conditions. After ignition drop burner load to minimum of 10
mmWC combustion air pressure. To moderate temperature use nitrogen or steam. Follow the temperature curve for dry out. TAKE YOUR TIME
Tips, Tricks and Troubleshooting Open the WHB vent to atmosphere (this will drop WHB
outlet temperature and allows to operate with excess air) In-line burners
Flame colour: Know your gas composition! Natural Gas (C1) gives a blue-pink salmon colour at sub-
stoichiometric conditions Propane (C3) gives a more blue-yellow flame at sub-
stoichiometric conditions Raise combustion air flow approx 5%: if this results in a
temperature rise of 4 to 8°F you are running sub-stoichiometic
Starting the RGG/TGT/SCOT: have all systems running and prepare extra cooling
21
Duiker DFD 2 Flame detector
2012 Duiker Sulphur Recovery Unit
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The Flame Signal can be split into the following information:
Electro Magnetic Radiation Light (UV, VIS & IR)
Modulation Radiation
Mixing Process Flame Flickering
23
T1
T2
Duiker DFD 2 Flame detector
Delta
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Duiker DFD 2 Flame detector
27
Duiker DFD 2 flame detector Data logger
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Duiker DFD 2 flame detector Data logger
Main Burner
LMV Burner Principle Combustion air
Acid gas
Fuel gas
Pilot burner or ignitor
Acid fuel gas gun
Register
Airnose
Burner Turndown Burner turndown is determined by the minimal flow through the burner restriction
P of acid gas + air + (fuel gas) 0,15 kPa
Design capacity is based on max. allowable P of acid gas and air (Max. 10 kPa).
Oxygen Enrichment Rich Acid Gas
Fuel gas
Rich acid gas
Air
O2
In-line Burners
Overall View - Reheater
Multiple in-line burners with pneumatically retractable ignitors
Incinerator
Tail Gas Incinerators
SRU tail gas incinerator being commissioned
Mixing
(Typical) Temperature and velocity
profile of incinerator with inlet nozzles
Low NOX Incinerator Burners
Different Flame Scanner Systems
UV scanners + Low cost scanner - Needs shutter system for safe guarding - Poor or no flame signal with steam injection IR scanner + Low cost scanner - Poor or no flame signal FG firing T scanner + No influence on steam / nitrogen injection - High cost scanner Combination scanner
How to Detect a Flame?
Spectral sensitivity range of the scanner
200 400 600 800 1000Wavelength (nm)
Rad
iant
Sen
sitiv
ity (A
/W)
SiliconGaP without filter GaP with UV-filterUV-tube
Dos and Don’ts Never remove a scanner wit a open ball valve as acid
gas can come out Checking the sight port for pollution: Exchange the
position of the scanner and a sight glass Run scanner cables through steel pipe in order to avoid
radiation in the cable (fail-safe self check) Avoid potential difference in ground systems (welding /
igniting) Avoid strong radio signals close to the scanner / cable /
amplifier Avoid temperature rise above 70 deg. C Check purge flow (min. 10 m3/h) and clean lens systems
Different Types of Thermocouples
Different Types of Thermocouples
Different Types of Pyrometers
Ignition Systems: Pilot Burner
The pilot burner is a small self supporting burner Gas pressure : 1,0 bar , air pressure 1,2 bar.
Pilot Burner Flames
Ignition Systems: Igniter
Duiker-Durag Unit generates 1500 volts
Unit retracted during operation
Operational life time of the tip is 14 hours of sparking
Start-up and Dry-out of Clean Unit
Close WHB blow off Start inline burners. Use same ratio
conditions as found for the main burner Extra caution you have to rely on
instruments only, use if possible a sacrifice type K thermocouple to monitor burner temperature
Take your time
Duiker Field Services
Bright Yellow Sulphur
Thank you for your kind attention
For more information:
www.duiker.com
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