A mathematical model of a fluidized bed reactor for the continuous production of solvents by immobilized Clostridium acetobutylicum

2007 ◽  
Vol 48 (3) ◽  
pp. 369-378 ◽  
Author(s):  
Nasibuddin Qureshi ◽  
Ian S. Maddox
Keyword(s):  
Mathematical Model ◽  
Fluidized Bed ◽  
Clostridium Acetobutylicum ◽  
Continuous Production ◽  
Fluidized Bed Reactor

scholarly journals DEVELOPMENT AND VERIFICATION OF APPROPRIATENESS FOR MATHEMATICAL MODEL OF HEAT BALANCE OF ELECTROTHERMAL FLUIDIZED BED REACTOR

2018 ◽  
Vol 41 (2) ◽  
pp. 35-40
Author(s):  
K.V. Simeiko
Keyword(s):  
Mathematical Model ◽  
Fluidized Bed ◽  
Thermal Efficiency ◽  
Heat Balance ◽  
Fluidized Bed Reactor ◽  
Fluidized Bed Reactors ◽  
Average Deviation ◽  
Model Average ◽  
Thermochemical Process ◽  
Experimental Values

Supply of heat through combustion of organic fuel is impossible or economically unviable for the raw of high temperature processes due to it’s technological peculiarities. Some of these processes can be carried out in electrothermal fluidized bed reactors. Development of appropriate mathematical model for heat balance will allow prognostication of capacity needed to carry out specific process and improvement of electrothermal fluidized bed reactor. During the development of mathematical model methods of heat-mass exchange theory were applied.  Verification of appropriateness for mathematical model was carried out through comparison of experimental results and calculated values of the amount of heat needed to perform the process of methane pyrolysis in electrothermal fluidized bed and coefficient of thermal efficiency of electrothermal fluidized bed reactor. Comparison with real thermochemical process in electrothermal fluidized bed reactor confirms the appropriateness of mathematical model. Average deviation of mathematical model of heat balance and coefficient of thermal efficiency from obtained experimental values is 5…7 % and 6…9 % respectively. Proposed mathematical model can be applied in design of electrothermal fluidized bed reactors.

Biological Oxidation of Ferrous Iron in High Acid Mine Drainage by Fluidized Bed Reactor

1991 ◽  
Vol 23 (7-9) ◽  
pp. 1447-1456 ◽  
Author(s):  
T. Omura ◽  
T. Umita ◽  
V. Nenov ◽  
J. Aizawa ◽  
M. Onuma
Keyword(s):  
Mathematical Model ◽  
Acid Mine Drainage ◽  
Fluidized Bed ◽  
Ferrous Iron ◽  
Mine Drainage ◽  
Iron Oxidation ◽  
Fluidized Bed Reactor ◽  
Biological Oxidation ◽  
High Acid ◽  
Ferrous Iron Oxidation

The biological oxidation of ferrous iron in high acid mine drainage was studied both in the batch experiment and in the fluidized bed reactor with the Amberlite IRA-938 as a support medium. From the batch experiment, the effects of initial ferrous iron and dissolved oxygen concentrations on the specific rate of ferrous iron oxidation could be expressed by Monod type equation. The fluidized bed reactor achieved the ferrous iron oxidation of over 90% within the flow rate region of 0.75 1/hr to 4.5 1/hr. The ferrous iron oxidation in the fluidized bed reactor was ot so much influenced by the change in the water temperature. The fluidized bed reactor should be operated under the condition that the influent pH is not more than 2.0 because of the clogging by the ferric hydroxide. Based on the experimental results obtained, a mathematical model which describes the behaviour of ferrous iron concentration in the fluidized bed reactor was proposed. This mathematical model well predicted the effluent concentration of ferrous iron from the fluidized bed reactor at both steady and unsteady states.

Cluster-Based Modeling of Fluidized Catalytic Oxidation of n-Butane to Maleic Anhydride

2006 ◽  
Vol 4 (1) ◽  
Author(s):  
Hamid Reza Hakimelahi ◽  
Rahmat Sotudeh-Gharebagh ◽  
Navid Mostoufi
Keyword(s):  
Mathematical Model ◽  
Maleic Anhydride ◽  
Fluidized Bed ◽  
Flow Reactor ◽  
Plug Flow ◽  
Fluidized Bed Reactor ◽  
Solid Particles ◽  
Reactor Model ◽  
Two Phase ◽  
Cut Method

A mathematical model is proposed for the partial oxidation on n-butane to maleic anhydride (MAN) in a gas-solid fluidized bed reactor. The reactor consists of two regions, i.e., a lower dense region and an upper dilute region. The dynamic two-phase structure was used for modeling the lower dense bed hydrodynamics. The upper region hydrodynamics was modeled by a cluster based approach. This allows the porosity distribution to be calculated for plug flow reactor model assumed for the gas phase in this region. The basic assumption in the cluster based approach is that the solid particles move only as clusters and the amount of single particles in the upper region is negligible. The mathematical model was obtained from coupling the kinetic sub-model, obtained from the literature, with this hydrodynamics sub-model. Comparing the results of the model with the experimental data available in the literature showed close agreement. Two other methods (i.e., particle based approach and short-cut) were also tested in this work. However, it was found that the cluster based approach modeling is quite suitable for the fluidized bed reactor used in this study. The short-cut method seems reasonably applicable for the prediction of the overall conversion but does not provide any local information (such as concentration profiles, yield, etc.) within the fluidized bed reactor.

Sign in / Sign up

Export Citation Format

Share Document