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Study of Flow Behaviro in Biogas Reactor Using Computational Fluid Dynamics Method

Name: อริยา พรพระตั้ง

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Biogas Reactor

; CFD

; Simulation

; Two-Phase Flow

Abstract: An anaerobic reactor model is developed by using the Computational Fluid Dynamics (CFD) software. The anaerobic model of one phase flow and two-phase flow are developed to study the effect of gas phase on the mixing of fluid inside the reactor. The simulation results show the enhancement of produced gas on the mixing of fluid. Moreover, the model of two-phase flow, which let the liquid and gas phases flow together to the system, is simulated. It is used to study the effect of liquid upflow velocity on fluid flow behavior. The liquid upflow velocity is varied in the value of 0.1, 0.2 and 0.3 m/hr while the gas flow rate is fixed at 0.013 kg/hr, which is the general condition in the real plant. The simulation results show that the liquid upflow velocity 0.3 m/hr can enhance the mixing of fluid more than the condition of liquid upflow velocity of 0.2 and 0.1 m/hr. Due to the difference of the hitting position of liquid at the top wall region. The modeling of one-phase and two-phase flow at the condition of liquid upflow velocity 0.2 m/hr are modified by adding the tracer NaCl. For two-phase flow model, the reaction of CO2 production is created in the CEL function. The reaction is assumed to be a function of sulfuric acid concentration in the first order. The RTD curves from simulation are compared with the experimental results. It is found that the simulation results do not match with the experimental results in the both cases. Because the difference in the liquid upflow velocity as well as the CO2 formation in the case of two-phase flow between the model and experiment. It causes the fluid flow behavior in the model is not the same as the experiment. However, the dynamic viscosity that appears in the momentum equation should be adjusted in the further work in order to match the simulation results with the experimental results.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: Lect. Wiwat Ruenglertpanyakul

Role: Supervisor

Created: 2546

Issued: 2005-09-19

Modified: 2006-05-09

วิทยานิพนธ์/Thesis

ISBN: 9741839162

CallNumber: CHE1464

tha

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Chemical Engineering

Grantor: King Mongkut's University of Technology Thonburi

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