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Articles by K.K. Lau
Total Records ( 6 ) for K.K. Lau
  F. Ahmad , K.K. Lau and A.M. Shariff
  Natural Gas (NG) processing is one of the major industrial separation processes. Membrane process, a relatively new technology among other available techniques, can be used for the removal of impurities like carbon dioxide from NG. Membrane performance has been described by different mathematical models over the decades. In this work, a simple mathematical model has been suggested to be incorporated with ASPEN HYSYS in order to design the membrane system for CO2/CH4 separation. Parameter sensitivities were analyzed by changing the operating conditions, such as feed composition and pressure and membrane properties (including selectivity of the membrane). Moreover, different configurations have been investigated for the optimized design including single stage (with and without recycle) and double stage membrane systems. It is shown that methane recovery can be improved by recycling permeate stream as well as by using double stage membrane system.
  S.A. Nouh , K.K. Lau and A.M. Shariff
  The understanding of detailed fluid flow in the fixed bed adsorption column is substantially crucial since the mass and heat transfer in the bed is influenced by the column hydrodynamics. In this study, an integrated CFD model was developed to model and simulate the adsorption dynamics and hydrodynamics of gaseous fluid (CH4 and CO2 mixture) in the fixed bed adsorption column. The developed integrated model was used to determine the CO2 concentration factor at the column (which indicating the CO2 adsorption capacity) as a function of time, based on different operating conditions. The simulated results were compared with experimental data and found to give a good agreement with error less than 2.5%. The effect of various influencing parameters such as feed velocity, bed porosity and feed concentration were studied to investigate their influences on the CO2 adsorption capacity. Besides, the effect of inlet CO2 concentration on the bed temperature profile was also studied in the present study.
  S. Binyam , H. Mukhtar and K.K. Lau
  Amine based sweetening process has been widely used for the removal of carbon dioxide and hydrogen sulfide from sour natural gas. However, during the process of absorption-desorption, a small amount of amine get carries over and discharged into the effluent wastewater stream. Treatment of amine wastewater using existing wastewater treatment plant (WWTP) without any dilution is very challenging due to its high Chemical Oxygen Demand (COD). However, dilution increases the volume of the wastewater and requires extension of the existing WWTP. Therefore, treatment of amine contaminated wastewater is a major concern for amine sweetening plants. Limited work has been done for treatment of amine contaminated wastewater, especially using membrane separation processes. The present study investigated the flux and rejection characteristics of methyldiethanolamine solution across composite polyamide reverse osmosis membrane (AFC99). The experimental work was carried out to investigate the effect of pressure, cross flow velocity and pH. The findings showed that AFC99 membrane was able to reject up to 99% of MDEA depending on the operating conditions.
  Aisha Ahmed , A. Maulud , M. Ramasamy , K.K. Lau and S. Mahadzir
  The riser of an industrial RFCC unit is simulated using a steady-state multi-fluid Eulerian 3D model in ANSYS FLUENT workbench 14. The comprehensive hydrodynamics model together with 7-lump kinetic model describes the flow behavior and cracking reactions inside the riser very well. The radial variation in the axial particle velocity and particle volume fraction is found. The product distribution and temperature distribution along the riser shows very good agreement with the industrial RFCC plant data.
  Z.H. Ban , K.K. Lau and A.M. Shariff
  The natural gas in Malaysia is high in CO2 content. The well removal of CO2 from natural gas can be carried out by using physical absorption method. CO2 will be absorbed at high pressure and desorbed at low pressure. The objective of this study was to analyze the phenomenon of CO2 desorption across a venturi nozzle. Dissolved CO2 gas bubble nucleation in water was studied by using CFD simulation. Models regarding bubble nucleation of dissolved gas and solubility in water at different pressure were written in User Defined Function (UDF) to be incorporated into FLUENT. The main parameters that affect the bubble nucleation are the pressure drop across the nozzle and the number of dissolved gas molecules in solution, which is defined by the solubility at the initial condition. The bubble nucleation rate increased exponentially with pressure drop. The highest bubble nucleation was found to be at the wall of the throat of the nozzle. No bubble nucleation can be detected for area with insufficient pressure drop. The bubble nucleation rate profile was similar as the pressure profile across the nozzle.
  Nor Hidayah Khalid , K.K. Lau and Azmi Mohd Shariff
  An investigation of the selected geometry for Compact Inline Contactor (CIC) has been carried out to study the effect of geometry on the pressure drop and mass transfer rate. Ejector type geometry has been selected and two-dimensional (2D) surface has been created for gas-liquid study using CFD approach. Operating condition is maintained by using constant value for inlet pressure and flow-rate for both gas and liquid. The length of diameter ratio of mixing tube (Lm/Dm) was varied from 5, 6 and 7. At Lm/Dm = 7, pressure recovery is found to be faster than other Lm/Dm ratios. However, at Lm/Dm = 5, mass transfer rate profiles is better than others.
 
 
 
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