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February 18, 2017, 01:14 |
Problems with Biomass Gasification
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#1 |
New Member
Chalumpol
Join Date: Oct 2016
Posts: 2
Rep Power: 0 |
Hello Everyone..
I'm researching about Biomass Gasification in downdraft gasifier in Thailand and i would like to simulate the temperature distribution and mole fraction in the gasifier with CFD and i'm newbie with it. I found a paper that is closed to my work. the link is https://www.researchgate.net/publica...IT_BUNCH_WASTE.I have read that paper and i try to study from that. My model is on below of the paragraph. Capture.PNG My model is refer to that paper, 2D Realization k-e model, with steady state. i used species transport with 9 species as CH4,CO,N2,H2O,O2,C<S>(use in particle surface reactions),H2,CO2,and Volatiles. i used species transport with finite rate/eddy dissipation and the reaction i add in reaction tab is Volatile decomposition reaction 1. Vol + 0.174O2 + 0.457H2 ---> 0.268CO + 0.371H2O + 0.357H2 +0.003N2 Gas Phase Reaction 2. 2CO + O2 ---> 2CO2 3. 2H2 + O2 ---> 2H2O 4. CO + H2O ---> CO2 + H2 Particle Surface Reactions 5. C<s> + O2 ---> CO2 6. 2C<s> + O2 ---> 2CO 7. C<s> + 2H2 ---> CH4 8. C<s> + H2O ---> COH2 the volatiles which is calculated from coal calculator is balanced from the producer gas, so I have to add hydrogen to balance the equation. Capture2.PNG boundary condition: drying ---> 373k pyrolysis ---> 673k gasification ---> 1073k reduction ---> 573k air inlet(mass flow rate) ---> 1.68e-3 kg/s (2 nozzles) fuel inlet (mass flow rate) ---> 2.78e-3 kg/s My surface body is air. and all the wall temp is 300 kelvin with the coefficient of heat transfer 10 W/m2. and internal emissivity is 0.6. The solution control is set as default. And solution initiation is hybrid.The solution method is used SIMPLE. Least-squared Cell based,the pressure methods is PRESTO!, and the others are First Order Upwind. When i run calculations, the result goes to 9 iterations and stopped running with the error "Error: received a fatal signal (Segmentation fault). Error Object: #f". and the value at all of the species are zero. Capture4.PNG Capture3.PNG The question is how can i check the cause of the error and how can i solve it? Thank you for your kind answer. |
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August 29, 2017, 04:57 |
problem with chemkin
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#2 |
New Member
Nityanand Hiraprasad Kushwaha
Join Date: Aug 2017
Posts: 5
Rep Power: 9 |
since you mentioned the paper you are following I got interested in your query because I am also doing a simulation using same the paper but I am not getting the required solution. Also conc. of CO and H2 are main species to focus upon but without chemkin I am getting nothing.
can u please help in chemkin? Also iam uploading meshing pics and convergence pics.conver.txt mol. conc. of CO CO conc.jpg PLEASE HELP ME IN CHEMKIN! |
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Tags |
biomass gasification, gasification |
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