Hi,

I was wondering if anyone has experience in writing UDF for coal gasification and can give some insights from where to start. any help will be appreciated.

Thanks

Hello,

I have UDF + scheme file for coal devolatilization, combustion, and gasification. I use the discrete phase model in Fluent. Within the define injections panel you will see to the right an option to hook custom laws to your particles. This is where you connect your gasification law to the Fluent solver. Someone else wrote the UDF (it is over 1500 lines) so I am not too comfortable with the physical models/kinetic rate parameters employed, but I am learning fast. I would like to correspond with you on this because we share the same problem.

Regards, AAS

Hi,

We can surely correspond on this topic. Do you mind sharing the UDF code with me and if I am able to understand it, I can tell you too. you can also email me at hmore@ualberta.ca.

Waiting for your quick reply.

Hemant

Hi,

Is ur UDF working? I am right now stuck in writing the UDF. Can you give some insights?

Thanks

Hemant

[abhijay1987]

Hi Hemant and AAs.

I am also working on simulating coal gasification in Fluent. I was trying to write a UDF. I wrote a program on MATLAB for modeling an entrained bed gasifier and it works fine. Now I wanted to do the same in Fluent but I m stuck with the UDF part as I dont have much experience in this. I would greatly appreciate any help from Both of you.

Thanks
Abhijay
my email id: abhijay_iit@yahoo.com

[ramakant]

hello friends
i want to do simulation of coal combustion (COKE OVEN PLANT) in ANSYS FLUENT 6.3
please help me regarding my project ,i am from ISM dhanbad M.TECH student ,i have already done one project on ANSYS FLUENT.
MY EMAIL ID:ramakant_chemical@yahoo.co.in

thank you

Originally Posted by RE13
;146869

Hello,

I have UDF + scheme file for coal devolatilization, combustion, and gasification. I use the discrete phase model in Fluent. Within the define injections panel you will see to the right an option to hook custom laws to your particles. This is where you connect your gasification law to the Fluent solver. Someone else wrote the UDF (it is over 1500 lines) so I am not too comfortable with the physical models/kinetic rate parameters employed, but I am learning fast. I would like to correspond with you on this because we share the same problem.

Regards, AAS

[Keran.kp]

Pleased to find the people who r working on the problem like me.
I'm Keran Patel, presently doing my masters in Thermal Engg and stuck up with the problem.Its my M tech Project right now.
Its regarding the combustion in Downdraft gasifier.
I wouldnt be able to find the correct way how to initiate the combustion in my project.?I m working on Ansys Fluent 6.3 right now.i already designed a model in Gambit 2.3.

I've used segregated solver,K-E Model (Standard), Enabled Energy Equation,Used Species and transport reaction Model,DPM Model.

Any help would be highly appreciated.

Thanking You,
- Keran

[maleyue]

Originally Posted by Hemant
;146847

Hi,

I was wondering if anyone has experience in writing UDF for coal gasification and can give some insights from where to start. any help will be appreciated.

Thanks

hi,I want to know why do you want to write UDF for coal gasification?
the volatile modle is not fit for coal gasification? or the chemisty mechanism is not good ? or others.
I really appreciate your answer.Thank you!

[jairmeza]

Originally Posted by RE13
;146869

Hello,

I have UDF + scheme file for coal devolatilization, combustion, and gasification. I use the discrete phase model in Fluent. Within the define injections panel you will see to the right an option to hook custom laws to your particles. This is where you connect your gasification law to the Fluent solver. Someone else wrote the UDF (it is over 1500 lines) so I am not too comfortable with the physical models/kinetic rate parameters employed, but I am learning fast. I would like to correspond with you on this because we share the same problem.

Regards, AAS

Hello,
I am working with a CFD simulation of a downdraft gasifier. Could you send me the UDF to complete my simulation?
Many thanks,

[xiaonirvana]

Hi Hemant and AAs,

Many thanks if you could share the UDF codes for gasification. I am stuck to this during compiling. Much appreciated if you could share to cocoonofmay@gmail.com.
Thanks

[ymanoj4]

Hi friends
Many thanks if you could share the UDF codes for gasification. I am doing coal gasification simulation in fluent as my MTech project. Here is my mail-ymanoj4@gmail.com

[manowars]

Hi friends,

I am working on biomass gasification in DFB. I am interesting on CFD with this topic also. Could you mind to share this UDF?
Here is my email: ngoichson@gmail.com

[papteo]

Hi all,

I would be really grateful if you could also send me this UDF. I am doing a diploma thesis now on this field. my e-mail is papteo2004@yahoo.com

Thank you very much in advance :-)

[ian.maes]

Hi,

My name is Nicholas Agon and I'm doing my PhD at Ghent University, Belgium.
My topic is the CFD modelling of a plasma gasification system for wood.
Like many of you, I'm also stuck on describing the process of gasification in Fluent.
A prerequisite to using combusting particles for the injection is that the gas-phase density should be calculated by using the ideal gas law. Additionally, I experienced that a user-defined function for the specific heat capacity for the gas phase isn't allowed either, but mixing-law should be used.
Does anybody has experienced the same?
In my case, it is really important to use my UDFs to describe the correct properties of the gas mixture (because of the altered properties at very high temperatures).
My idea was to write custom laws for devolatilization that would allow my way of calculating the density and specific heat of the gas mixture.

I have worked successfully with the DEFINE_PROPERTY macros in Fluent, but I could use some tips for writing custom discrete-phase (DPM) model laws.
Could anyone suggest how to start the coding, or share an example of a custom DPM law? You can post something here, or mail me at nicholas.agon@ugent.be
It would be much appreciated!

Kind regards,

Nicholas

[prishor]

Hi Keran,

I am also doing Mtech project in bubbling fluidized bed gasification. can you give me some suggestion regarding simulation of 2D gasifier with species transport. i am stuck with simulation. solution is not converging.

thanks and regards,

prishor

Originally Posted by Keran.kp

Pleased to find the people who r working on the problem like me.
I'm Keran Patel, presently doing my masters in Thermal Engg and stuck up with the problem.Its my M tech Project right now.
Its regarding the combustion in Downdraft gasifier.
I wouldnt be able to find the correct way how to initiate the combustion in my project.?I m working on Ansys Fluent 6.3 right now.i already designed a model in Gambit 2.3.

I've used segregated solver,K-E Model (Standard), Enabled Energy Equation,Used Species and transport reaction Model,DPM Model.

Any help would be highly appreciated.

Thanking You,
- Keran

[prishor]

Hi AAS,
I am prishor, currently doing mtech project on biomass gasification in bubbling fluidized bed gasifier. i have to do the simulation of gasification reactions in fluent 6.3. can u please tell me how can i input devolatilization, combustion and gasification processes in fluent. can u please help me by sharing your udf available with u./

my mail id is prishor@gmail.com

with many many thanks..\
prishor

Originally Posted by RE13
;146869

Hello,

I have UDF + scheme file for coal devolatilization, combustion, and gasification. I use the discrete phase model in Fluent. Within the define injections panel you will see to the right an option to hook custom laws to your particles. This is where you connect your gasification law to the Fluent solver. Someone else wrote the UDF (it is over 1500 lines) so I am not too comfortable with the physical models/kinetic rate parameters employed, but I am learning fast. I would like to correspond with you on this because we share the same problem.

Regards, AAS

[w112w]

hello
i am doing simulation of coal combustion in ANSYS FLUENT 6.3, too.
however,if use my udf. the finial CO2 will decrease. it is very rediculous. the results are total different from without using the UDF.
Can you share your udf for me to check my mistake or give me some suggestion? my email: wgl@dem.ist.utl.pt

Originally Posted by RE13
;146869

Hello,

I have UDF + scheme file for coal devolatilization, combustion, and gasification. I use the discrete phase model in Fluent. Within the define injections panel you will see to the right an option to hook custom laws to your particles. This is where you connect your gasification law to the Fluent solver. Someone else wrote the UDF (it is over 1500 lines) so I am not too comfortable with the physical models/kinetic rate parameters employed, but I am learning fast. I would like to correspond with you on this because we share the same problem.

Regards, AAS

[clcLee]

Hi AAS,
I m currently doing my graduate project on coal gasification in fluidized bed gasifier . But i m a fresh in fluidized bed simulation , can u share ur UDF code , because i really need this to study how to set devolatilization, combustion and gasification processes in fluent .can u help?

my mail id is ky1988xj@163.com

regards
Lee

Originally Posted by RE13
;146869

Hello,

I have UDF + scheme file for coal devolatilization, combustion, and gasification. I use the discrete phase model in Fluent. Within the define injections panel you will see to the right an option to hook custom laws to your particles. This is where you connect your gasification law to the Fluent solver. Someone else wrote the UDF (it is over 1500 lines) so I am not too comfortable with the physical models/kinetic rate parameters employed, but I am learning fast. I would like to correspond with you on this because we share the same problem.

Regards, AAS

[5超7]

Have you solved you problem?
I am also doing the same problem of coal gasification.
And I have no idea of the udf which should be made to represent the coal gasification reaction.
Could you send your code to me for study and reference? Thank you very much.
My e-mail is 374141173@qq.com

[onlylno]

Originally Posted by RE13
;146869

Hello,

I have UDF + scheme file for coal devolatilization, combustion, and gasification. I use the discrete phase model in Fluent. Within the define injections panel you will see to the right an option to hook custom laws to your particles. This is where you connect your gasification law to the Fluent solver. Someone else wrote the UDF (it is over 1500 lines) so I am not too comfortable with the physical models/kinetic rate parameters employed, but I am learning fast. I would like to correspond with you on this because we share the same problem.

Regards, AAS

I am just learning UDF for the coal devolatilization, combustion. Could you give me some examples?
Thanks in advance!
yujie_upc@126.com