Bert Uneken, Field Engineering Manager Ruben Kranenburg, Technical Support

Transcription

1 Bert Uneken, Field Engineering Manager Ruben Kranenburg, Technical Support

2 Main Burner

3 Main Reaction Furnace Design Weather shield View ports Weather shield LMV Burner Burner / Furnace connection Residence time section Checker wall / Choke ring WHB connection Temp. Measurement Man way

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5 Refractory Lining

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7 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 ,00 1,00 2,00 4,00 5,00 6,00 7,00 9,00 10,00 11,00 12,00 14,00 15,00 16,00 17,00 19,00 20,00 21,00 22,00 0,00 1,00 2,00 3,00 5,00 6,00 7,00 8,00 10,00 11,00 12,00 13,00 15,00 16,00 17,00 18,00 Time in hr

8 Start-up and Dry-out Clean Unit Open the WHB vent to atmosphere

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12 Refractory Lining

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14 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

15 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

16 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 substoichiometric conditions Propane (C3) gives a more blue-yellow flame at substoichiometric conditions Raise combustion air flow approx 5%: if this results in a temperature rise of 4 to 8 F you are running substoichiometic Starting the RGG/TGT/SCOT: have all systems running and prepare extra cooling

17 Duiker DFD 2 Flame detector 21

18 The Flame Signal can be split into the following information: Radiation Modulation Electro Magnetic Radiation Light (UV, VIS & IR) Mixing Process Flame Flickering 2012 Duiker Sulphur Recovery Unit 22

19 Duiker DFD 2 Flame detector T1 Delta T2 23

20 Duiker DFD 2 Flame detector 24

21 Duiker DFD 2 flame detector Data logger 27

22 Duiker DFD 2 flame detector Data logger 28

23 Main Burner

24 LMV Burner Principle Airnose Combustion air Register Fuel gas Pilot burner or ignitor Acid gas Acid fuel gas gun

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26 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).

27 Oxygen Enrichment Rich Acid Gas Fuel gas Rich acid gas Air O 2

28 In-line Burners

29 Overall View - Reheater

30 Multiple in-line burners with pneumatically retractable ignitors

31 Incinerator

32 Tail Gas Incinerators

33 SRU tail gas incinerator being commissioned

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35 Mixing (Typical) Temperature and velocity profile of incinerator with inlet nozzles

36 Low NO X Incinerator Burners

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38 Different Flame Scanner Systems UV scanners IR scanner T scanner + Low cost scanner - Needs shutter system for safe guarding - Poor or no flame signal with steam injection + Low cost scanner - Poor or no flame signal FG firing + No influence on steam / nitrogen injection - High cost scanner Combination scanner

39 How to Detect a Flame? Radiant Sensitivity (A/W) Wavelength (nm) UV-tube GaP without filter GaP with UV-filter Silicon Spectral sensitivity range of the scanner

40 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 m 3 /h) and clean lens systems

41 Different Types of Thermocouples

42 Different Types of Thermocouples

43 Different Types of Pyrometers

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45 Ignition Systems: Pilot Burner The pilot burner is a small self supporting burner Gas pressure : 1,0 bar, air pressure 1,2 bar.

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47 Pilot Burner Flames

48 Ignition Systems: Igniter

49 Duiker-Durag Unit generates 1500 volts Unit retracted during operation Operational life time of the tip is 14 hours of sparking

50 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

51 Duiker Field Services

52 Bright Yellow Sulphur

53 Thank you for your kind attention For more information: