4 replies to this topic

[Ahsan Jalal]

Hi guys
m lookin for a book which deals in calculation for furnace in refinery. Can any 1 help me in this regard..?
Thnx in advance

[ankur2061]

Ahsan,

Twos sources you can refer to:

1. API STD 560 Fired Heaters for General Refinery Service- Annex G, Measurement of efficiency of fired-process heaters. Sub-section G.3 deals with Determination of thermal & fuel efficiencies

2. Handbook of Petroleum Processing, David Jones & Peter Pujado, Section 18.5 - Fired Heaters

Hope this helps.

Regards,
Ankur.

[iyer]

I have done one myself. There is a lot of literature on the web. Hydrocarbon processing has some really good articles. I can give you the issues if you have access to them.
I assume you are going for the indirect method.
A good article came out on the July 2003 issue
"Flue gas analysis - a storehouse of information
Here's a step-by-step procedure to determine heater performance
R. K. GHOSH, Haldia Refinery, Indian Oil Corp., West Bengal, India"

This can be a good starting point.

If you need any more info, feel free to ask. I would also suggest to use this as a starting point and do your own calcs to be clear on things.

[Skyline]

Do these literatures also contain the method to calculate the draft (pressure) inside the furnace? I need one...
Thank you very much...

[ankur2061]

Do these literatures also contain the method to calculate the draft (pressure) inside the furnace? I need one...
Thank you very much...

Skyline,

The "Handbbok of Petroleum Processing" gives an equation for heater draft which is as follows:

D = 0.187*H*(rho_a-rho_g)

where:

D = draft in inches of water

H = height of stack in feet

rho_a = densiy of atmospheric air in lb/ft³
rho_b = density of stack gases in lb/ft³at stack conditions

Notes:
1. Stack gas temperatures are lower by approximately 100 deg F than gases leaving the convection section.
2. Stack gases have a molecular weight close to that of Nitrogen.
3. Burner draft requirements are in the range of 0.2 to 0.5 inches of water.

Hope this helps.

Regards,
Ankur.