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Bulk Residence Time In Naphtha Cracking


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#1 mehul

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Posted 19 October 2018 - 12:25 AM

I have notice during simulation of Pyrolysis Furnace in Petrosim and VMG sim with increasing of bulk residence time , yield of Ethylene increase is it possible?



#2 Bobby Strain

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Posted 19 October 2018 - 09:09 AM

No.



#3 mehul

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Posted 19 October 2018 - 01:12 PM

Thanks for Replying , then what is the problems with the modeling.?? 



#4 Bobby Strain

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Posted 19 October 2018 - 02:07 PM

For models that are even close to reality you must pay a hefty price. Like TechnipFMC's Spiro.

 

Bobby



#5 mehul

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Posted 21 October 2018 - 01:02 AM

I Have Checked in Spyro same things Happened.

Residence time 0.287969

Summary wt% 
H2 0.943047
CH4 15.785
C2H2 0.32585
C2H4 27.786
C2H6 3.727
MAC 0.331634
PPD 0.221013
C3H6 13.879
Residence time s 0.255565
H2 0.926958
CH4 15.345
C2H2 0.324114
C2H4 27.6
C2H6 3.703
MAC 0.335917
PPD 0.223868
C3H6 14.315


#6 Bobby Strain

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Posted 21 October 2018 - 09:38 AM

You appear to be modelling an old furnace. And without further information, I agree with the results you present. This is very low severity operation, and not a modern furnace. Typical ethylene yield from naphtha is above 35 wt%.



#7 mehul

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Posted 21 October 2018 - 11:56 AM

Thanks For Your Response , Yes I further check my model and reconfigure its Radiant tube geometry and now it is exactly match i.e if i reduced residence time , mass % of ethylene Yield Increased

 

Residence time   0.3347                  0.3745
Property Mass Flows Mass Flows
Unit                   tonne/hr                    tonne/hr
Hydrogen 0.126494216        0.124871432
Nitrogen 0                    0
CO                                  0                    0
Oxygen          0                    0
Methane              2.339436892          2.264064622                                 P/E                     P/E
Ethylene              4.433405143          4.306722525                           0.490548091    0.528358875
Ethane                 0.553673784          0.559572123
CO2                              0                           0
H2S                               0                           0
Propene                 2.174798431 2.275495069
Propane                 0.04841153           0.051967224
i-Butane 0.008699009 0.009955046
i-Butene 0.273057638     0.291197418
1-Butene 0.14084377 0.152214155
13-Butadiene 0.550685279 0.552482937
n-Butane 0.011446496 0.013477239
tr2-Butene 0.060344688 0.064331101

Edited by mehul, 21 October 2018 - 12:09 PM.





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