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ANODE GRADE COKE PRODUCTION FROM HS FEED |
NORMALLY FUEL GRADE COKE IS PRODUCED FROM DCUs HAVING FACILITY TO PROCESS HS FEED WITH LOW PRESSURE & LOW RR. HOW WE CAN PRODUCE SPONGE COKE FROM THESE DCUs WITH SULPHUR OF 3-4%? |
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| 2 |
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Green oil formation at CCR |
Presently we are facing a problem of green oil formation at in Net Gas compressor, how to minimize this green oil formation? |
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| 3 |
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Skin temperature indications in CCR furnace |
How the skin temperature indications in the CCR furnace (Fuel is Refinery Fuel gas) are validated? By thermography or Pyrometer or Theoretical calculation method? |
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| 4 |
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DMDS injection to CCR platformer feed and NHT operating Temperature |
1.Whether DMDS injection is keeping continuously at platformer feed by refiners ?
2.Control at stripper bottom sulphur by NHT operation to maintain recycle gas H2S at platformer ;Is it acceptable ?
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| 5 |
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High H2S content in Vac slop and VR |
1. We are facing high H2S in Fuel oil and vacuum slops. VDU bottom level was decreased, VDU bottom temperature was decreased, stripping steam and coil steam increased. Even then vacuum slop is showing H2S presence of >15 ppm. RCO (Reduced crude oil –LR) also shows presence of H2S 2.3 ppm so stripping steam of CDU unit also increased and RCO result showed H2S presence as 0.5 ppm.
Exchangers were also checked for leak and found normal. What could be the possible reason for high H2S in vacuum slops and Vacuum residue ?.
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| 6 |
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Crude unit overhead corrosion monitoring & mitigation |
Sir, wish to know industry best practices on corrosion monitoring and mitigating measures in Crude unit overhead circuits. Following info is being sought:
1) Corrosion monitoring parameters with limits
2) Allowable & actual corrosion rate in overhead circuits
3) mitigating measures being adopted |
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| 7 |
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Air preheat heater performance |
Sir, wish to know performance of Air preheaters (APH with Cast & Glass APH) across the industry. following information is sought:
1) what is replacement frequency of Glass APH.
2) what are the reasons for frequent failure of Glass APH section and any measures to avoid the same.
3) what is GAPH flue gas exit temperature vis-à-vis dew point temperature |
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| 8 |
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Sustaining crude preheat temperature |
Sir, wish to know industry practice on sustaining crude preheat temperature. Following details is sought:
1) what is the annual preheat temperature drop observed across various refineries and how crude preheat temperature is sustained?
2) how are the fouled exchangers being cleaned? |
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