CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

Industrial burner light oil/natural gas combustion

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By executor

LinkBack Thread Tools Search this Thread Display Modes
Old   January 31, 2012, 06:38
Default Industrial burner light oil/natural gas combustion
New Member
Join Date: Mar 2011
Posts: 10
Rep Power: 12
executor is on a distinguished road
Dear combustion modelers,

I'm trying to model dual fuel (not simultaneous combustion) burner attached on hot water boiler (ca. 20 MW of burner output). As for light oil, i have managed to get adequate results in comparison to measured values on boiler plant. I have used WD2 NO PDF reaction and EDM. The results (temp. field) are shown in first attached picture. All predicted values (temp, CO, NO) have been accurate.

The problem I'm having now is with combustion of natural gas. I'm using same mesh (burner geometry stays the same). I have specified the same reactions as for the first case (difference is that for NG I'm using Methane Air mixture - Methane Air WD2 NO PDF; all in gaseous state). Combustion model is still EDM with coefficient B of 0,5. The case converges, but as for Post, I'm getting some silly results (picture 2). Either the temperature is way too high (I've run this case with two different EDM settings) and flame fills only 50% of domain, or domain is on "constant" temperature. As for cold flow; streamlines are O.K.

I'm modeling this case as pure CH4 - Air mixture (Natural gas E consists 97% of CH4) as an easy case (later will upgrade to NG - Air).

Do you have some suggestions on where my errors are??

Oh, and I'm using mass flow for air and fuel inlets. Outlet is on static pressure; wall has a Heat transfer option (hot water temp is on ca. 363 K).

Attached Images
File Type: png NR_KOEL_Temp.png (72.4 KB, 48 views)
File Type: png NR_ZP_Temp.png (40.6 KB, 38 views)
ahmed khaled likes this.
executor is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
mass flow in is not equal to mass flow out saii CFX 12 March 19, 2018 05:21
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
combustion natural gas burner Jorge Chacón Hernandez FLUENT 4 May 26, 2010 07:03
Methane combustion in gas burner Stefano CFX 1 June 7, 2005 02:12
Gas pressure question Dan Moskal Main CFD Forum 0 October 24, 2002 22:02

All times are GMT -4. The time now is 13:17.