Dear developers:
I tried to use pic method to calculate the multi-component pyrolysis of biomass. Fixed density was adopted. Theoretically, with the progress of reaction, the diameter of biomass particles would become smaller and smaller. However, in the calculation, it was found that the particle diameter always increased rapidly, and the problem was not found. Please help check this problem 
, thank you very much!!! The case file has been packaged and uploaded, please see the attachment.
pyrolysis_1.zip (2.1 MB)
The main issue here is that the high reaction rates lead to the overconsumption of a solid species. This gives incorrect mass change of particles. We will fix this in the next release (24.3).
In the meantime, using the stiff solver in Chemistry pane or reducing the reaction rates should help to deal with it.
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hi，zishuo，I am also using this case for calculations, but the downside is that I am using the CFD DEM method. The initial conditions contain 84000 sand particles, but using 0.36m/s nitrogen gas will blow out the sand. Do you have such a problem and how is it solved
sorry, I don’t have this problem, but if you have a chemical reaction, maybe you can pay attention to whether the reaction rate is too fast, and the reactants instantly produce a lot of gas and cause the sand to blow out.