Showing papers on "Packed bed published in 2019"
TL;DR: In this paper, an energy and exergy-based performance of a solar dryer integrated with packed bed (TES) as thermal energy storage medium has been evaluated, where the drying kinetics of orange slices were determined.
70 citations
TL;DR: In this paper, different physical models to evaluate the thermal performance of packed bed for sensible heat storage with air as the heat transfer fluid (HTF) were discussed and the mathematical equations were numerically solved by applying the finite volume method, and the derived results are corroborated by the existing experiments in the literature.
Abstract: In this article, we discuss different physical models to evaluate the thermal performance of packed bed for sensible heat storage with air as the heat transfer fluid (HTF). The mathematical equations are numerically solved by applying the finite volume method, and the derived results are corroborated by the existing experiments in the literature. Numerical simulations are performed with different solid storage materials and for various mass flow rates of HTF, porosity and solid material size. Detailed characteristics of the packed bed are discussed and various numerical results are presented. The applicability of pressure drop and the thermal optimization of the packed bed are also discussed.
66 citations
TL;DR: Ni/La2O3-MgAl2O4 has been investigated for dry reforming of methane in a cold plasma dielectric barrier discharge (DBD) fixed-bed reactor.
Abstract: Ni/La2O3-MgAl2O4 has been investigated for dry reforming of methane (DRM) in a cold plasma dielectric barrier discharge (DBD) fixed-bed reactor. Ni/La2O3-MgAl2O4 was prepared according to the modif...
62 citations
TL;DR: In this article, a graphite/water composite sphere is used to enhance the thermal conductivity of phase change materials (PCMs) and reduce the freezing and melting times of the PCM.
53 citations
TL;DR: In this paper, the absorption performance of SO2 into calcium-based solution was studied in a rotating packed bed (RPB), and experiments were carried out to examine the effect of various operating parameters on the desulfurization efficiency.
49 citations
TL;DR: In this article, the effect of particle shapes of Ni-α Al2O3 catalysts on a pressure drop and a methane conversion was investigated in a cylindrical packed bed with various particle shapes such as a simple cylinder, a Raschig ring, a 7-holes cylinder, and a sphere.
48 citations
TL;DR: In this paper, a comparison was made between 13X zeolite and carbon model structures and their conventional equivalents: beads for CO2 and H2S adsorption, using thermogravimetric analysis and breakthrough measurements in a packed bed reactor (PBR) system.
45 citations
TL;DR: In this paper, a translucent photocatalytic this paper was designed using borosilicate spheres small enough to create an array of interconnected microchannels in the reactor and the light field was characterized using a ray tracing algorithm.
44 citations
TL;DR: The efficiency and reusability of sugarcane bagasse (SCB) as a low-cost immobilization support for high strength phenol removal in recirculating upflow PBRs is evaluated and it is shown that the SCB-immobilized C. tropicalis could be employed as a cost-effective packing material for removal of high strength Phenolic compounds in real scale PBR.
44 citations
43 citations
TL;DR: In this paper, the results demonstrate that the model predicts a thermal nonequilibrium and heat recuperation mechanism in the combustion wave in the low-velocity regime correctly with explicit consideration of the three-dimensional porous structure and interstitial flow with thermal interaction between fluid and solid phases including the detailed chemical kinetics model and solid to solid radiation.
TL;DR: In this paper, the expression of thermal front propagation and unbalanced mass flow rates between the inflow and the outflow of packed beds is developed and validated experimentally, and a feasible and self-balancing PTES system without buffer vessel is proposed, with a round-trip efficiency 0.12% higher than the buffer vessel balancing PTES systems.
TL;DR: In this article, the thermal response and adsorption kinetics of various silica-gel/aluminum foam beds under typical operating conditions are investigated experimentally and numerically.
Abstract: Effective thermal conductivity of a silica-gel/water adsorption packed bed is significantly enhanced by placing silica-gel particles in a high-porosity aluminum foam. The enhancement leads to several folds increase in the specific cooling power (SCP), cooling capacity per unit volume (CPv) and coefficient of performance (COP) of an adsorption cooling (AD) chiller. The thermal response and adsorption kinetics of various silica-gel/aluminum foam beds under typical operating conditions are investigated experimentally and numerically. Effect of pores per inch (PPI) of the foam, silica-gel particle size, bed height and adsorption isotherm of different types of silica-gel on the bed performance are investigated. Based on the results, aluminum foam with 20 PPI is recommended for adsorption cooling applications due to its high surface area and small cell size. 20 PPI aluminum foam can deliver a SCP of 827 W/kg, a CPv of 517 W/m3 and a COP of 0.75.
TL;DR: In this article, the performance of a water TES tank with encapsulated paraffin wax packed bed was investigated, and the results indicated that the performance was not as good as the conventional water tank in stratification, but the advantage of encapsulated PARW packed bed is obvious especially when operating at small flow rate, releasing much more thermal energy with qualified hot water.
TL;DR: In this article, two filamentous fungi Aspergillus carbonarius M333 and Penicillium glabrum Pg1 were immobilized in macro porous polymeric support (MPPS) to treat real textile industry wastewater.
TL;DR: In this article, the sorption capacity of methylene blue on the Scenedesmus was obtained at various temperatures (22°C, 30°C and 37°C) and pH values (5, 7 and 9).
TL;DR: In this article, a new type of continuous-flow heterogeneous electro-Fenton (EF) reactor, in which electrochemically formed H2O2 was externally injected to the iron-carbon granules packed bed, was designed to degrade a model dye, Tartrazine.
TL;DR: In this article, the optimum condition of the working parameters of a rotating packed bed (RPB) contactor for arsenic removal by activated carbon was investigated and optimised by Taguchi method.
Abstract: High gravimetric technology or HIGEE is a novel technique which uses centrifugal force in a rotating packed bed (RPB) contactor. In RPB, a doughnut shaped bed is spun at high speed to allow fluid to flow through an adsorbent bed at a high velocity. Centrifugal force enhances the adsorption process with increased mass transfer coefficient. In this study, the optimum condition of the working parameters of a RPB contactor for arsenic removal by activated carbon was investigated and optimised by Taguchi method. Five parameters, namely rotating speed, feed rate, packing density, initial concentration and initial solution pH were considered in determining the initial optimal condition in a L16 orthogonal array. According to the signal to noise ratio (S/N), the optimum condition obtained from the L16 experiments are rotating speed of 1600 rpm, feed rate of 50 L/h, packing density of 510 kg/m3, initial concentration of 150 mg/L and pH of 3. Depending upon the delta value, which is the difference between the highest and lowest S/N ratio, it was found that the initial concentration was the least affecting factor and pH could be fixed at 3 for practical purposes.
TL;DR: In this article, the effect of SiC for hydrogen production for fuel cell applications is investigated, where both packed bed mixing and bulk doping methods were introduced to study the effects of adding SiC to the Ni/Al2O3-SiC catalyst.
TL;DR: In this article, the authors used a new porous media model, a novel liquid generation-elimination model for numerically investigating the gas-liquid countercurrent flow in rotating packed bed (RPB) and a new interfacial area model derived from the volume of fluid (VOF) simulation.
TL;DR: In this article, a mesoscale 3D CFD modeling approach is proposed which can be used to investigate the liquid flow in both laboratory and large-scale RPBs in detail and accuracy.
TL;DR: In this paper, a packed bed photoreactor was developed using a structured photocatalyst active under visible light, which was irradiated by visible light-emitting diodes (LEDs) for the evaluation of photocatalytic activity in the removal of different types of water pollutants.
Abstract: A packed bed photoreactor was developed using a structured photocatalyst active under visible light. The packed bed reactor was irradiated by visible light-emitting diodes (LEDs) for the evaluation of photocatalytic activity in the removal of different types of water pollutants. By using a flexible LEDs strip as the external light source, it was possible to use a simple cylindrical geometry for the photoreactor, thereby enhancing the contact between the photocatalyst and the water to be treated. The visible light active structured photocatalyst was composed by N-doped TiO2 particles supported on polystyrene spheres. Photocatalytic results showed that the almost total methylene blue decolorization was achieved after 120 min of irradiation. Moreover, the developed packed bed photoreactor was effective in the removal of ceftriaxone, paracetamol, and caffeine, allowing it to reach the almost total degradation of the pollutants and a total organic carbon removal above 80% after 180 min of visible light irradiation.
TL;DR: In this article, a rotating packed bed (RPB) was employed to enhance the absorption process of NOx and SO2 into Na2SO3 solution with the preoxidation by ozone.
Abstract: This study employed a rotating packed bed (RPB) to enhance the absorption process of NOx and SO2 into Na2SO3 solution with the preoxidation by ozone. The absorption performance of NOx and SO2 was e...
TL;DR: In this paper, a Ni-CaO-mayenite CSCM was investigated in multicycle experimental tests under mild and severe regeneration conditions, in thermogravimetric analysis for CO2-capture/regeneration and in an automated packed bed test rig for SESMR/calcination.
TL;DR: In this paper, a one-dimensional numerical model able to describe many packed-bed configurations is developed and presented, which is able to treat liquid and gaseous heat transfer fluids, and packed bed with a monomodal or a bimodal particle size repartion, consisting of a mixture of large and small solid particles (such as rocks and sand).
TL;DR: Nag et al. as discussed by the authors used hybrid artificial intelligence GA-ANN for simulation and optimization of Cd(II) removal efficiency prediction as a function of influent variables, which performed appreciably well in terms of cross-correlation coefficient (R) value (between 0.997 to 0.999) and minimization of errors.
Abstract: This paper is continuation of our earlier paper in batch studies (Nag et al., 2018) and aims to deliver efficient and affordable solution for Cd(II) remotion from their wastewater of small to medium scale industries operating in India and worldwide. Three biowaste materials, jackfruit, mango and rubber leaves are used for Cd(II) bioremediation from synthetic wastewater in continuous down flow in packed bed columns. The influence of influent concentration (20–80 mg L−1), flow rate (10–25 ml min−1) and bed depth (3–9 cm) on Cd(II) removal has been examined at pH 6. Rise in bed height favoured the adsorption process whereas the decrease in bio-sorption efficiency was recorded at high influent flow rate and concentration. 98.26% Cd(II) was removed at breakthrough by jackfruit leaves at a flow rate of 10 ml min − 1 when the influent concentration was 20 mg L−1 and 5 cm bed height. Different kinetic models were evaluated for their comparative applicability. Applicability of hybrid artificial intelligence GA-ANN was attempted as a tool for simulation and optimization of Cd(II) removal efficiency prediction as a function of influent variables. The network performed appreciably well in terms of cross-correlation coefficient (R) value (between 0.997 to 0.999) and minimization of errors.
TL;DR: In this article, a mesh-pin rotor (MPR), combining an inner wire mesh packing zone (IMZ) and an outer resin pin zone (OPZ), was designed with the purpose of anti-blockage for the first time.
TL;DR: In this article, the concentration of twenty elements in the solid residue after the thermal conversion of dried sewage sludge was measured, mainly targeting the change in concentration of heavy metals under different thermochemical conditions.
TL;DR: In this paper, a predictive numerical model based on literature correlations capable of designing moving packed-bed heat exchangers as well as investigating the effects of particle size, operating temperature, and particle velocity (residence time).
Abstract: Particle-based concentrating solar power (CSP) plants have been proposed to increase operating temperature for integration with higher efficiency power cycles using supercritical carbon dioxide (sCO2). The majority of research to date has focused on the development of high-efficiency and high-temperature particle solar thermal receivers. However, system realization will require the design of a particle/sCO2 heat exchanger as well for delivering thermal energy to the power-cycle working fluid. Recent work has identified moving packed-bed heat exchangers as low-cost alternatives to fluidized-bed heat exchangers, which require additional pumps to fluidize the particles and recuperators to capture the lost heat. However, the reduced heat transfer between the particles and the walls of moving packed-bed heat exchangers, compared to fluidized beds, causes concern with adequately sizing components to meet the thermal duty. Models of moving packed-bed heat exchangers are not currently capable of exploring the design trade-offs in particle size, operating temperature, and residence time. The present work provides a predictive numerical model based on literature correlations capable of designing moving packed-bed heat exchangers as well as investigating the effects of particle size, operating temperature, and particle velocity (residence time). Furthermore, the development of a reliable design tool for moving packed-bed heat exchangers must be validated by predicting experimental results in the operating regime of interest. An experimental system is designed to provide the data necessary for model validation and/or to identify where deficiencies or new constitutive relations are needed.
TL;DR: In this article, numerical simulations and experiments have been carried out to explore the pressure drop and the loss factor in the thermochemical recuperators filled with the catalysts of various shapes.