Experimental study of food grain drying in a gas–solid vortex reactor

Singh, Pavitra; Kalita, Pankaj; Mahanta, Pinakeswar

doi:10.1080/07373937.2020.1835948

Cited by 11 publications

(2 citation statements)

References 46 publications

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“…To circumvent this problem, the static gas-solid vortex reactor (GSVR) [6,20] has been considered because of its ability to enhance various processes, for instance, drying [21][22][23], fast pyrolysis [24,25], and SO 2 and NO x adsorption [26], etc. This static device is inevitably mechanically simpler than RFBs.…”

Section: Introductionmentioning

confidence: 99%

Gas-solid hydrodynamics in a stator-rotor vortex chamber reactor

Lang

Ouyang

Vandewalle

et al. 2022

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Gas-solid hydrodynamics in a stator-rotor vortex chamber reactor

Lang

Ouyang

Vandewalle

et al. 2022

Chemical Engineering Journal

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“…The efficiency of the heat and mass exchange in these high centrifugal devices makes them an excellent candidate for achieving high process intensification [23, [176][177][178]. The technology is adaptable and has been explored for various processes including combustion [179], separation [158,159,180], coating [156], biomass pyrolysis [91,150,181,182], and drying [153,183]. Other important advantages of using vortex chamber technology involve: increase in the gas throughput, higher gassolid slip velocities, high heat and mass transfer rates, smaller residence times, narrow residence time distribution, and uniform fluidization [184][185][186].…”

Section: Introductionmentioning

confidence: 99%

Towards a multizone vortex dryer for dairy sprays

Rahman

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Conventional co-current spray dryers are widely used in the dairy industry to produce milk powder. These dryers are known for their high capital costs and low thermal efficiencies and are responsible for almost 27-55% of the total energy consumption of the dairy industries. In comparison to co-current dryers, countercurrent dryers have higher thermal efficiencies but they are not employed in the food industry due to the risks of product degradation.The conventional spray dryers used in the food industry suffer from multitude of disadvantages. They operate at relatively low air temperatures to avoid product degradation, which results in small drying rates [13]. Furthermore, the terminal velocities of the particles result in small gas-solid slip velocities, restricting the heat and mass transfer. The advent of multi-stage spray dryers (two or three stages) with integrated fluidized beds has improved the energy efficiency of the process by 13% [13][14][15][16][17]. Nevertheless, the drying systems are still far from beingThe evolution of a vortex chamber technology is a Radial Multizone Dryer (RMD) [44][45][46][47], shown in Figure 1.1-b. In this configuration, hot air enters axially into the central zone while the vortex is created via relatively cold airflow entering the RMD via the tangential channels; see Figure 1.1a. The process intensification is developed as an outcome of both: multizone drying operations with high and low temperature air feeding zones, and high-G acceleration. Consequently, the drying occurs in two steps: (i) the majority of drying takes Chapter 6 summarizes the conclusions drawn in the previous chapters and provides recommendations for future research.Experimental investigations of the atomization and counter-current spray drying process 9 Chapter 2 EXPERIMENTAL INVESTIGATIONS OF THE ATOMIZATION AND COUNTER-CURRENT SPRAY DRYING PROCESSThis chapter presents an experimental analysis of a counter flow spray drying process using water and skim milk as a feed. The study is performed by examining the droplet size distribution of sprays and the temperature profiles in the dryer. The influence of air inlet temperature, air mass flow rate, feed flow rate, and droplet size on air temperatures in the dryer is evaluated. The evaporation and deposition zones are found to be highly dependent on droplet sizes. The obtained results show that it is possible to achieve efficient contact between hot air and spray in a small volume using a counter-current mechanism.

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