CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Devolatilization of coal

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

Like Tree1Likes
  • 1 Post By alainislas

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 26, 2022, 03:18
Default Devolatilization of coal
  #1
New Member
 
WEST BENGAL
Join Date: Oct 2022
Posts: 2
Rep Power: 0
Kuntalika is on a distinguished road
Hi, I am trying to set up coal gasification in ANSYS Fluent using DPM and species transport model
Here are my queries-
1. I want to model the devolatilization of coal particle as coal = Vol + char (C)
I can find the injection tab where I can define the devolatilization species as Vol, but how to define the remaining char material?
I can see in some tutorials C<S> to be taken while selecting the mixture material template, but I am not sure where the C<s> is defined as the char material, is it by default?
2. I have tried one simulation with selection of C<S> of in the mixture material tab. after running the case for some time I can see the c<s> fraction in the DPM particle tracking to be zero. can anyone please explain if this means the char material is not defined properly?
3. for the char-gas reaction I am trying out particle surface reaction where I am defining different char-gas reactions )species transport). is this a correct way of defining the heterogeneous reactions?
Kuntalika is offline   Reply With Quote

Old   October 26, 2022, 05:39
Default
  #2
Senior Member
 
alainislas's Avatar
 
Alain Islas
Join Date: Nov 2019
Location: Mexico
Posts: 142
Rep Power: 6
alainislas is on a distinguished road
1) I suggest you to use the coal calculator in the species transport model. There you will speciify the HCV, UA and PA and Fluent will use its template to create a coal-volatiles-air mixture for you.

2) Look under Materials->mixture, there you will have some species but still missing the solid carbon c<s>. So add it to the coal-volatiles-air mixture.

3) In the specis transport model, activate the particle surface reactions.

4) Add your heterogeneous reaction to the reaction mechanism. Like for example C<s> + O2 -> CO2 and choose your particle combustion model. If for instance, you want gasification reactions as well, then switch to multiple surface reactions and then add the subsequent heterogeneous reactions. Then under DPM setup, go to the tab "Multiple reactions" and be sure to set the char fraction to 1.0


-------------------------
Please like if helpful
Attached Images
File Type: png 1devol.PNG (10.4 KB, 17 views)
File Type: png 2devol.PNG (35.5 KB, 18 views)
File Type: png 3devol.PNG (31.8 KB, 18 views)
File Type: png 4devol.PNG (22.0 KB, 17 views)
Kuntalika likes this.
alainislas is offline   Reply With Quote

Reply

Tags
char gas reaction, devolatilisation model, dpm, dpm fluent, heterogeneous reaction

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
UDF for improved coal devolatilization model in fluent(devolatilization ) magic0801 Fluent UDF and Scheme Programming 3 May 23, 2023 05:18
Coal combustion injection properties semo FLUENT 12 May 16, 2017 19:40
udf for a new coal devolatilization model ZJUXJK Fluent UDF and Scheme Programming 0 March 7, 2017 23:29
Fixed Bed Coal gasification nabeelicet FLUENT 0 February 2, 2014 06:36
Coal Combustion - Devolatilization Rate Unit Amanda FLUENT 3 July 18, 2007 12:55


All times are GMT -4. The time now is 05:16.