The accurate description of low-rank coal pyrolysis and catalytic depolymerization process is the basis and key to multi-scalesimulation, design and scale - up of reactors. Therefore, a simple, high - precision, and easily coupled low order coal depolymerization model with multi-scale reactor simulation was proposed based on the non-isothermal pyrolysis and catalytic pyrolysis experiments oflow rank coal. The proposed model was compared with the one-step kinetic model and the distributed activation energy model (DAEM)which were most commonly used in reactor simulation. Finally, the adaptability of the model was verified by the experimental data of catalytic cracking of coal samples catalyzed by four catalysts. The results show that the new model proposed in this study can effectively simulate the whole process of low-rank coalpyrolysis. Compared with the one-step reaction model and the distribution activation energy model(DAEM), the model is not only simple, but also has a much higher simulation accuracy than those two models, reaching over 0.99. Inaddition, the pyrolysis simulation results of coal samples catalyzed by four catalysts show that the model can also simulate the catalytic depolymerization process very well, which further proves that the model is not only simple and accuracy, but also with wider range of application and higher applicability. It can be seen that the model proposed in this study has significant advantages in combining with multiscale reactor simulation. The proposed model not only enrichs the kinetic system of coal pyrolysis, but also provides a simpler and more accurate method for the simulation and amplification of the reactor.
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