Modelling of biomass pyrolysis

smallsuper · November 7, 2016, 11:24

Hello, am a student working on modelling of biomass pyrolysis in a fixed bed reactor using fluent with the aim of predicting the bio oil, char and gas yield. I am new to fluent therefore having issues on how to go about it, I have the following questions:

1. how do I represent my biomass sample since it's not on ansys database?
2. how do I represent the fixed bed part of the reactor?
3. how many phases should I used and I do I allocate the phases?
4. I need a UDF for the pyrolysis process, will be glad if anyone can attach it or send it to akinpeluakorede01@gmail.com.

thanks in anticipation for an answer.

Santospe · March 22, 2017, 06:16

Hi smallsuper,

How are you doing.

I see your question was posted a long time ago, but since I am starting it here right now, I will try to answer some of the points you outlined.

1. how do I represent my biomass sample since it's not on ansys database?

To represent your biomass sample in the software you will need a proximate analysis (volatile matter, fixed carbon and ash content) and the elemental/ultimate analysis of your biomass (C, H, N, O, S).

2. how do I represent the fixed bed part of the reactor?
You can use any modeling software to do your control volume.For example, I will use Inventor or SolidWorks. Just remember, the more detail you have, more complex will be your meshing and as a consequence more time required to simulate the flow. So if your reactor consists of a tube, equiped with heating elements on the outside surface, your constrol volume is the inner part of the tube, right where the gas flows or reaction takes place. I suggest you do a solid element for your CV representation instead of a hallow tube.

Well, as I told you, I am a beginner here too, and am getting used with the simulation. Hope it helps.

Take care.

Humberto Santos

smallsuper · March 22, 2017, 09:11

Thanks Santospe for your response. I got your first point but your second point looks obscure, can you explain better? I am thinking of modelling the fixed bed as a porous media. How do you plan modelling the bio-oil product?

m.uzair · June 25, 2018, 06:04

i have problem in defining biomass gasification in using eulerian multiphase model. more specifically, how to define/model biomass in ansys fluent using multiphase model
thanks

November 7, 2016, 11:24	Modelling of biomass pyrolysis	#1
smallsuper New Member AKINPELU Akorede David Join Date: Nov 2016 Posts: 4 Rep Power: 9	Hello, am a student working on modelling of biomass pyrolysis in a fixed bed reactor using fluent with the aim of predicting the bio oil, char and gas yield. I am new to fluent therefore having issues on how to go about it, I have the following questions: 1. how do I represent my biomass sample since it's not on ansys database? 2. how do I represent the fixed bed part of the reactor? 3. how many phases should I used and I do I allocate the phases? 4. I need a UDF for the pyrolysis process, will be glad if anyone can attach it or send it to akinpeluakorede01@gmail.com. thanks in anticipation for an answer. falaknaz likes this.

March 22, 2017, 06:16	Modeling of biomass pyrolysis	#2
Santospe New Member Humberto da silva santos Join Date: Mar 2017 Posts: 1 Rep Power: 0	Hi smallsuper, How are you doing. I see your question was posted a long time ago, but since I am starting it here right now, I will try to answer some of the points you outlined. 1. how do I represent my biomass sample since it's not on ansys database? To represent your biomass sample in the software you will need a proximate analysis (volatile matter, fixed carbon and ash content) and the elemental/ultimate analysis of your biomass (C, H, N, O, S). 2. how do I represent the fixed bed part of the reactor? You can use any modeling software to do your control volume.For example, I will use Inventor or SolidWorks. Just remember, the more detail you have, more complex will be your meshing and as a consequence more time required to simulate the flow. So if your reactor consists of a tube, equiped with heating elements on the outside surface, your constrol volume is the inner part of the tube, right where the gas flows or reaction takes place. I suggest you do a solid element for your CV representation instead of a hallow tube. Well, as I told you, I am a beginner here too, and am getting used with the simulation. Hope it helps. Take care. Humberto Santos

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March 22, 2017, 09:11		#3
smallsuper New Member AKINPELU Akorede David Join Date: Nov 2016 Posts: 4 Rep Power: 9	Thanks Santospe for your response. I got your first point but your second point looks obscure, can you explain better? I am thinking of modelling the fixed bed as a porous media. How do you plan modelling the bio-oil product?

June 25, 2018, 06:04		#4
m.uzair Member Muhammad Ali Uzair Join Date: Sep 2017 Posts: 44 Rep Power: 8	i have problem in defining biomass gasification in using eulerian multiphase model. more specifically, how to define/model biomass in ansys fluent using multiphase model thanks