Coal combustion in Non-premixed combustion

  • Last Post 20 September 2018
cehangir posted this 17 September 2018


I am doing non-premixed combustion for coal using single mixture fraction method. I have two inlets. Primary inlet is for the coal+air, and secondary inlet is for the air. I have DPM injection set to be 0.03 kg/s, based on the HCV of coal for 70kW thermal input as surface injection at primary inlet. 

When setting up boundary conditions for the inlets, I have set mean mixture fraction set as 0 (air in gaseous phase) for the primary and secondary inlets. However, the flame produced is very tiny as compared to the flame I have produced using EDM combustion. 

I am under the assumption that the volatiles are introduced after the devolatilization in the system, which is why I set the mean mixture fraction as 0. Is it a right approach ? Or do I have to set the mean mixture fraction in the primary inlet to a value >0 to accommodate for the volatiles produced during devolatilization ?

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Kremella posted this 19 September 2018


I've moved your post to the Fluid Dynamics thread so it gets more visibility on the community.

Thank you.

Best Regards,



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  • cehangir
seeta gunti posted this 20 September 2018

Hello Cehangir,

Regarding your query on coal combustion, we have a video tutorial in our youtube channel. Please go through the following link.