Understanding problems with crusher models in Dyssol #115
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I am a student of the TU Bergakademie Freiberg. In a scientific work I use Dyysol as a basis for the simulation of a grinding plant. The programming language C++ was new for me and I started to learn it. I could not find the models CSTR-PBM and PBM TM on GitHub. Are the models still in the testing phase? Holdup 'Holdup' in unit 'Wälzmühle' is empty. I suspect that the last two are built on population balance models. Is there any way to know what each parameter stands for and how the matrices are formed. I found the following literature for population balance models for crushers: https://uir.unisa.ac.za/bitstream/handle/10500/28454/dissertation_tshinguz_gm.pdf?sequence=1 Are the calculation rules and approaches to this similar? Best wishes Jacob |
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Dear Jacob, Bond Bimodal is indeed very similar to Bond Normal model, described in the documentation. In output of the Normal model is a normal distribution with mean value calculated based x80 based on the power input, and a user-defined standard deviation. The Bimodal model uses the same approach to calculate mean x80 based on the power input. But then it iteratively tries to find a fraction of material that must be crushed to hit that x80 assuming each particle breaks in two equal parts. Crusher CSTR-PBM is not yet released. It should be a dynamic unit that uses a simple PBM with given selection S = A*(x/x0)^k and breakage B_ij = Phi*(x_i/x_j)^mu + (1-Phi)*(x_i/x_j)^nu functions. PBM TM also uses descretized population balance model. The documentation is under preparation, but its almost complet description can be found in this article To fix "Holdup 'Holdup' in unit 'Wälzmühle' is empty" specify one time point in Holdups Editor -> Wälzmühle -> Holdup. |
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Dear Jacob,
Bond Bimodal is indeed very similar to Bond Normal model, described in the documentation. In output of the Normal model is a normal distribution with mean value calculated based x80 based on the power input, and a user-defined standard deviation. The Bimodal model uses the same approach to calculate mean x80 based on the power input. But then it iteratively tries to find a fraction of material that must be crushed to hit that x80 assuming each particle breaks in two equal parts.
Crusher CSTR-PBM is not yet released. It should be a dynamic unit that uses a simple PBM with given selection S = A*(x/x0)^k and breakage B_ij = Phi*(x_i/x_j)^mu + (1-Phi)*(x_i/x_j)^nu functions.
PBM T…