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Low Sulfur Vacuum Residue As Fuel Oil In Furnace


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#1 Mayank_process engineer

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Posted 24 December 2016 - 03:03 AM

LSVR is heated by MP steam (14 KG/cm2 g) before being used as fuel in furnace. MP steam inlet line is not having automated control system at the inlet of heat exchanger. At the inlet there are one gate valve and one globe valve with blind and drain arrangement. At the downstream of heat exchanger there are steam traps in one operating and one standby mode. MP steam is in tube side and LSVR in shall side. LSVR Viscosity which can furnace burner handle is 20cst which can be achieved once LSVR temperature reached 160 degree C (thermocouple is provided on LSVR outlet). Is it a good design or any change is required in MP steam control? Kindly reply.

#2 latexman

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Posted 24 December 2016 - 08:44 AM

LSVR?  Please attach the P&ID so we don't have to draw it out.



#3 Mayank_process engineer

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Posted 24 December 2016 - 11:02 AM

LSVR is Low Sulfur Vacuum Residue.
Currently p&id is not available.
I have doubts regarding the steam line and condensate line control system. As only steam trap would be controlling the steam inlet flow.

#4 gegio1960

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Posted 29 December 2016 - 03:53 AM

the globe valve on steam inlet with TI on oil outlet could provide a rough manual control in steady conditions...



#5 rdcrags

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Posted 03 January 2017 - 09:33 PM

I agree. The burners should operate well over a viscosity range. I once had a plant manager look over a proposed design and say: "Too much instrumentation. If I flew over this plant and dropped a wrench, it would hit an instrument!"



#6 Mayank_process engineer

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Posted 07 January 2017 - 11:32 PM

Oil viscosity range shall be maintained by exchanger cold side and hot side temperature approach. Steam flow shall be controlled by steam trap based on oil heater duty requirement. Globe shall be used very rarely.
Steam line size us 3inch. If steam trap works fine , can there still be a chance of any steam blow off through oil heater?

#7 Dazzler

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Posted 20 January 2017 - 09:08 PM

Hi Mayank, 

 

I agree with others keeping the control simple should be fine.  I suspect the limiting heat transfer resistance is on the viscous oil side.

 

The steam side will not be limiting as long as the manual globe valve is set open enough for times when burners(s) are needing maximum fuel flow, and as long as the steam trap capacity (and condensate return system) can keep up with the condensate generation.  The steam flow will therefore vary by itself just to match the heat taken by the oil. 

 

The exchanger should also occasionally be cleaned on both sides of the heat transfer surface.

 

Dazzler






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