Experimental Study on Heat and Mass Transfer during Fast Pyrolysis of Biomass Particle

As Japan has many mountains with steep slopes, it is difficult to transport felled trees. Therefore, the development of a high-quality, compact gasifier that can cope with variations both in the amount of biomass collected and in energy demand, is necessary. Furthermore, in order to ensure that the system is used in the most efficient manner, it is necessary to increase our understanding of the reaction mechanisms involved in both the decomposition of biomass and heat transfer in the packed bed of biomass.

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Experimental study of the convective heat transfer coefficient in a packed bed at low Reynolds numbers

Thermal Science ◽

10.2298/tsci120715108m ◽

2014 ◽

Vol 18 (2) ◽

pp. 443-450 ◽

Cited By ~ 1

Author(s):

Souad Messai ◽

Ganaoui El ◽

Jalila Sghaier ◽

Ali Belghith

Keyword(s):

Heat Transfer ◽

Experimental Study ◽

Heat Transfer Coefficient ◽

Transfer Coefficient ◽

Convective Heat Transfer ◽

Convective Heat ◽

Convective Heat Transfer Coefficient ◽

Packed Bed ◽

Bed Temperature ◽

Proposed Model

An experimental study to evaluate the convective heat transfer coefficient in a cylindrical packed bed of spherical porous alumina particles is investigated. The task consists in proposing a semi-empirical model to avoid excessive instrumentation and time consumption. The measurement of the bed temperature associated to a simple energy balances led to calculate the gas to particle heat transfer coefficient using a logarithmic mean temperature difference method. These experiments were performed at atmospheric pressure. The operating fluid is humid air. The gas velocity and temperature ranged from 1.7-3 m/s and 120-158?C, respectively. The data obtained was compared with the correlations reported in the literature. It is shown that the proposed model is in reasonable agreement with the correlation of Ranz and Marshall. Despite, many researches on experimental investigations of heat transfer coefficient in packed beds at low and average temperature are proposed, few studies presented calculation of convective heat transfer coefficient at high temperature (above 120?C). A possible application of the proposed model is drying and combustion.

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Experimental Study of Packed Bed Heat Transfer in a Shaft Kiln to Pre-Heat Manganese Ore with Hot Air

SSRN Electronic Journal ◽

10.2139/ssrn.3926617 ◽

2021 ◽

Author(s):

Sifiso Sambo ◽

Lina Hockaday ◽

Tumisang Seodigeng

Keyword(s):

Heat Transfer ◽

Experimental Study ◽

Packed Bed ◽

Manganese Ore ◽

Hot Air ◽

Shaft Kiln

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Experimental Investigation of a Packed-Bed Latent Heat Thermal Storage System With Encapsulated Phase Change Material

Volume 6B: Energy ◽

10.1115/imece2014-38307 ◽

2014 ◽

Cited By ~ 10

Author(s):

Tanvir E. Alam ◽

Jaspreet Dhau ◽

D. Y. Goswami ◽

M. M. Rahman ◽

Elias Stefankos

Keyword(s):

Heat Transfer ◽

Experimental Study ◽

Latent Heat ◽

Flow Rate ◽

Storage System ◽

Volumetric Flow Rate ◽

Packed Bed ◽

Heat Transfer Fluid ◽

Encapsulated Phase Change Material ◽

Change Material

An experimental study on a laboratory scale prototype packed-bed latent heat thermal energy storage (TES) system is presented. Spherical capsules of sodium nitrate melting point of 306°C were used as the PCM and air was used as the heat transfer fluid (HTF). The storage system was operated between 286°C to 326°C and the volumetric flow rate of the HTF was varied from 110 m3/hr to 151 m3/hr. Temperature distribution along the bed and inside the capsules was monitored continuously during charging and discharging of the system. The effect of mass flow rate of the HTF on the charging and discharging time and on the pressure drop across the bed was also evaluated.

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