Empirical Design, Construction, and Experimental Test of a Small-Scale Bubbling Fluidized Bed Reactor

Vargas‐Salgado, Carlos; Hurtado-Pérez, Elías; Alfonso-Solar, David; Malmquist, Anders

doi:10.3390/su13031061

Cited by 11 publications

(10 citation statements)

References 66 publications

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“…To determine the air speed, we first find the Reynolds criterion and the Archimedes criterion using the criterion dependences of O.M. Todes [ 34 , 35 ].…”

Section: The Basic Part Of the Studymentioning

confidence: 99%

“…The research method is based on an improved method for studying the process of freezing juicy food products, such as sliced vegetables, berries, or fruits [ 15 , 16 , 17 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. Two-stage freezing was used with the formation of a frozen layer (ice crust), which prevented the possible sticking of vegetable cubes when the internal moisture passed to the crystalline structure.…”

Section: The Basic Part Of the Studymentioning

confidence: 99%

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Ways to Improve the Efficiency of Devices for Freezing of Small Products

et al. 2022

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It has been established that one of the main problems in the technology of the production of loose food products is the sticking of vegetables or fruits into one block. It has been proven that one of the steps to solve this problem is the use of berries, fruits, or vegetables during freezing in the form of a fluidized bed in air. However, a significant part of the energy is spent precisely when creating a fluidized bed with the help of fans. By improving the separation efficiency of small products in the freezing process, it would be possible to significantly reduce the energy costs of freezing worldwide. The purpose of this work was to determine ways to increase the efficiency of devices for freezing small products. The goal was achieved through the use of a modified method for studying energy costs, taking into account energy costs for fluidization and mechanical shaking. For comparison, two options for the efficient separation of small products during freezing were considered. Namely the separation of small products in the process of freezing with the help of fluidization, and with the help of mechanical shaking. Comparison of these variants showed that it was advisable to separate small products during freezing by mechanical shaking. It was established that their energy parameters, as well as fractional properties, are significantly different. The product temperature was determined for the case of a constant temperature of the cooling air and equipment elements. The results obtained confirmed the possibility of achieving significant energy savings of 1.5–3.5 times by using the mechanized device we proposed for freezing fruits and vegetables. The main result of this paper is the proposed method, or algorithm, for calculating energy costs for fluidization and mechanical shaking, which could be used in the design of devices for the freezing of small products; as well as the obtained data confirming the correspondence of the theoretical calculations to reality. The novelty of the research consists in presenting a model or algorithm for calculating the energy costs for fluidization and mechanical shaking. The importance of the results of the work lies in the possibility of using this technique to assess the energy effectiveness of devices for the freezing of small products.

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“…To determine the air speed, we first find the Reynolds criterion and the Archimedes criterion using the criterion dependences of O.M. Todes [ 34 , 35 ].…”

Section: The Basic Part Of the Studymentioning

confidence: 99%

Section: The Basic Part Of the Studymentioning

confidence: 99%

Ways to Improve the Efficiency of Devices for Freezing of Small Products

et al. 2022

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“…Quantifying the influence of vertical cooling tubes' presence on hydrodynamics, heat, and mass transfer rates is needed for efficient design, scale-up, and operation of the fluidized bed reactor for the Fischer Tropsch process. This type of data is highly needed in the literature because the design and scale-up of these reactors equipped with a bundle of cooling tubes are still based on employing the correlations obtained from experimental data collected in fluidized bed reactors without vertical cooling tubes [14,18,[22][23][24]. In addition, significant literature contributions have reported on heat transfer in fluidized bed reactors [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on heat transfer in a gas-solid fluidized bed with a bundle of heat exchanging tubes

Hasan¹,

Ali²,

Sultan³

et al. 2022

ETJ

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“…The ratio between primary energy of produced syngas to biomass primary energy, defined as the efficiency of the gasification process, is generally in the range between 60% and 90% [52][53][54]. Bisht et al, in [52], analysed on a simulative basis a small-scale biomass gasification plant.…”

mentioning

confidence: 99%

“…Ribó-Pérez et al [53] simulated a gasifier power plant including an electric generator by means of HOMER software. Vargas-Salgado et al [54] designed, sized and experimentally analysed small-scale fluidised bed gasification plants. The system produces syngas with a gasifier efficiency in the range 59-82%.…”

mentioning

confidence: 99%

Gas Engine-Driven Heat Pumps for Small-Scale Applications: State-of-the-Art and Future Perspectives

2021

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Gas engine-driven heat pumps are an interesting option to satisfy space heating and cooling demands aiming at energy saving, environmental impact and operating costs’ reduction. This work presents (i) a comprehensive review updated on gas engine-driven heat pumps research activities, (ii) the investigation of the central role of this technology in the air conditioning sector and (iii) the future perspectives regarding gas engine heat pumps’ diffusion in the context of the energy sector decarbonisation. The outcomes highlight that gas engine heat pumps could have better environmental performance compared to electric heat pumps both in heating and cooling operations. Moreover, they could play a pivotal role in the fight against climate change and energy security since they can guarantee an energy mix differentiation moving from electricity to natural gas and renewable gases’ usage. Indeed, by 2030, a lower-carbon gas grid could be supported by renewable gases. A further investigation has concerned diffusion of gas heat pumps activated from biofuels produced by local biomass in an energy community scenario based on a low-temperature energy district network. A novel biomass-based GEHP interacting with a low-temperature district heating network is proposed here. This system could save more than 30% of primary energy compared to biomass-fuelled boilers.

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Empirical Design, Construction, and Experimental Test of a Small-Scale Bubbling Fluidized Bed Reactor

Cited by 11 publications

References 66 publications

Ways to Improve the Efficiency of Devices for Freezing of Small Products

Ways to Improve the Efficiency of Devices for Freezing of Small Products

Experimental investigation on heat transfer in a gas-solid fluidized bed with a bundle of heat exchanging tubes

Gas Engine-Driven Heat Pumps for Small-Scale Applications: State-of-the-Art and Future Perspectives

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