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Fuel Gas Pressure At Heater Burners


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#1 J_Leo

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Posted 01 August 2011 - 09:52 PM

Dear all,

I am working on the instruments datasheet on the fuel gas and pilot gas lines to the burners.
In order to create a pressure profile of the fuel gas and pilot gas system, I need the pressure at the fuel gas and pilot gas burners. The recommended burners are Callidus or equavalent, low Nox, forced draft, staged fuel type.

Anyone can give some idea what should be the fuel gas pressure at the fuel gas burners and pilot buners?

Thank you in advance.

Lew

#2 Beergson

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Posted 02 August 2011 - 01:06 AM

Dear Lew,

Fuel Gas pressure upstream burners depends only on burner requirement, nozzles' construction and size and is determinated by burners' Vendor.
Main burner has always Heat Liberation Curve heat liberation is determinated versus fuel gas pressure) - You should look at it.

Edited by Beergson, 02 August 2011 - 01:06 AM.


#3 kkala

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Posted 02 August 2011 - 03:01 AM

Info on Callidus burners can be found at http://callidus.com..../Burner_bro.pdf, http://www.callidus.... Brochure31.pdf; there are several types of Callidus burners (e.g. Cubl-HC), also depending on application.
http://www.ukplumber...sure-table.html gives info on required pressure for several gas burners for boilers (post by gas man, 28-01-2010), but Callidus is not reported.
Reported pressures are much lower compared to a seen liquid fuel burner, requiring a fuel pressure up to ~ 10 kgf/cm2 g. In that case of liquid fuel, it was necessary to consider burner curve in order to specify fuel pressure upstream last control valve at max, normal, min fuel flow.
Agreeing with Beergson, you had better take data for the specific burner model from its supplier. Callidus burners seem flexible enough to burn low pressure fuel gas, model to be used will "determine" required pressure range.

Edited by kkala, 02 August 2011 - 03:05 AM.


#4 J_Leo

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Posted 02 August 2011 - 12:11 PM

Beergson and Kkala,
Thank you very much for your information.

I have another question: Usually, how far away of the upstream control valve to the burners?

#5 george111

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Posted 14 September 2011 - 04:17 AM

Hi,


The purpose of a fired heater is very simple: To add heat to a process fluid. Its representation on a process flow diagram is also very simple. But, of course, fired heaters are among the most complex pieces of process control equipment. Each furnace is, after all, at least two pieces of equipment in one. Firstly, it is a special variant of the shell and tube heat exchanger since its purpose is to exchange heat. Secondly, it is a chemical reactor in which fuel and air undergo extremely exothermic reactions to produce the required heat.For more information go to Fuel Gas Pressure

Edited by george111, 14 September 2011 - 04:18 AM.


#6 ankur2061

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Posted 14 September 2011 - 08:10 AM

lew,

Your vendor i.e. Callidus has to provide the inlet conditions for fuel gas at the burner. These would include the entire range of fired heater operation including the maximum stable turndown your burner can achieve. There are no general guidelines for such things when specific designs from specific vendors are used.

A general categorization of gas burners is described below:

The two most common types of gas burners are the “pre-mix” and the “raw gas”
burners.

Pre-mix burners are preferred because they have better “linearity”, i.e., excess air remains more nearly constant at turndown. With this type, most of the air is drawn in through an adjustable “air register” and mixes with the fuel in the furnace firebox. This is called secondary air. A small part of the air is drawn in through the “primary air register” and mixed with the fuel in a tube before it flows into the furnace firebox. A turndown of 10:1 can be achieved with 25 psig hydrocarbon fuels. A more normal turndown is 3 : 1.

Regards,
Ankur.

Edited by ankur2061, 14 September 2011 - 08:13 AM.


#7 Flame

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Posted 14 September 2011 - 10:50 AM

The fuel control valve has to located at least 15 meters away from the burners.




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