7 replies to this topic

[Talea]

Hello members,

It is the first time I post to this forum; I have been viewing through and I find it a valuable source of knowledge.

I am currently doing a research on fired heater thermal design. My question is about the visbreaker heater; what is the common firebox geometry, tubes orientation, and location of burners.

Would you please advise if there is any reference I can refer to for more information?

Thank you

Talea

[T.S.MURALI]

Hi!.

You must be aware of HTRI. Have a look at it. View the DEMO and examples provided there.

You will get a better insight.

Murali t.s

[Flame]

Hi Talea,

In Visbreaker heaters, typically, the coils are horizontally arranged along the walls (side) of the heater. The burners are located at floor and the firebox is box shape. In some cases the tubes are arranged (horizontally) in the center of the firebox with burners located (at floor) on both sides of the tube row.

General Knowledge about heaters can be obtained from www.heaterdesign.com.

Also dear google is wonderful source of information.


Regards

[Talea]

Thank you both for the information you posted. Actually, I tried to find information through google and existing textbooks in the field of fired heaters and petroleum refining but I could not find much about the visbreaker heaters.

About the heaters with bridge wall in the centre, I believe this type of heaters is usually used in coil soaker visbreaker heaters design, and I know that burners can be either installed in the floor close to the bridge wall or on the bottom of the side wall opposite to the bride wall. Can someone tell what configuration is most commonly used in the industry and what advantage it has over the other?

Thanks

Talea

[khalilalhashimy]

hi talea

Visbreaker Furnace

VISBREAKING PROCESS
Visbreaking, a mild form of thermal cracking, significantly lowers the viscosity of heavy crude-oil residue without affecting the boiling point range. Residual from the atmospheric distillation tower is heated (800-950 degrees F) at atmospheric pressure and mildly cracked in a heater. It is then quenched with cool gas oil to control overcracking, and flashed in a distillation tower. Visbreaking is used to reduce the pour point of waxy residues and reduce the viscosity of residues used for blending with lighter fuel oils. Middle distillates may also be produced, depending on product demand. The thermally cracked residue tar, which accumulates in the bottom of the fractionation tower, is vacuum flashed in a stripper and the distillate recycled.

[khalilalhashimy]

hi talea

Visbreaker Furnace

VISBREAKING PROCESS
Visbreaking, a mild form of thermal cracking, significantly lowers the viscosity of heavy crude-oil residue without affecting the boiling point range. Residual from the atmospheric distillation tower is heated (800-950 degrees F) at atmospheric pressure and mildly cracked in a heater. It is then quenched with cool gas oil to control overcracking, and flashed in a distillation tower. Visbreaking is used to reduce the pour point of waxy residues and reduce the viscosity of residues used for blending with lighter fuel oils. Middle distillates may also be produced, depending on product demand. The thermally cracked residue tar, which accumulates in the bottom of the fractionation tower, is vacuum flashed in a stripper and the distillate recycled.

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[breizh]

Hi ,

Let you consider this resource :

http://www.heaterdes...com/design0.htm

you should try to contact them

Breizh

[T.S.MURALI]

hI!

ya! this is one of the best sites>