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Determining suitable biomass particle size and pyrolysis time plays a crucial role in designing and improvement the performance of biomass fast pyrolysis in fluidized bed reactors for bio-oils production. Current numerical modelling investigations has not dealt with the particle sizes and fast pyrolysis time. In this paper, analytical methods were applied to investigate unsteady temperature fields...
This study investigates a real-time optimization strategy for micro-algae continuous processes. The objective is to determine the optimal dilution rate maximizing the biomass productivity on the basis of the on-line measurement of biomass concentration and minimum prior process knowledge. Two different micro-algae strains (with different growth rates) are considered in this study: Dunaliela tertiolecta...
Mathematical and computational modelling is now firmly established as an important tool in life sciences. However, it is not yet established as a source of biological knowledge on an equal footing with experimentation. Here we argue that there are now substantial opportunities for a new theoretical biology that not only benefits from experimental research but also influences this research. We argue...
The paper focuses on the pyro-gasification of thin wood particles in pure CO2 at 850°C under high heating rate conditions (similar to fluidized bed gasifiers). The aim is to assess the potential use of CO2 as gasifying medium and to learn more about its effects on the pyrolysis as well as on the char gasification stages. Experiments and numerical modelling provide answers on the unfolding of the CO...
Pyrolysis of a single biomass particle is numerically studied using a one-dimensional model which assumes virgin material decomposes through three parallel reactions to light gases, tar and char. In contrast to most past studies in which the heat of pyrolysis is assumed to be endothermic throughout the process, this paper presents a new method of calculating the pyrolysis heat in the simulation of...
A numerical model of the flow field of a 48t/h grate-fired boiler was presented in this paper. The air distributions in the furnace under different air supply ratio were considered in order to get the optimum air ratio. The three-dimensional Reynolds averaged Nervier-stokes equation with the Standard k-epsilon Model was solved. The result showed that the airflow ratio played a significant role on...
We propose in this article a continuous approach to model functional-structural plant growth based on the discrete GreenLab model. The continuous dynamics is driven by a system of differential equations with respect to calendar time, with a continuous mechanism of senescence introducing delay terms. A numerical scheme for solving the system is studied, and applied to sugar beet to compare different...
With the computational fluid dynamics software FLUENT the flow field of flue gas from one 75 t/h circulating fluidized bed combustion boiler was simulated. The results showed that when air distribution was not taken into account, the flow of the two flue gases in the bag filter were not uniform. The flow field of coal flue gas was more disordered than that of biomass, but the majority of them moved...
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