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Packed bed
About: Packed bed is a research topic. Over the lifetime, 8996 publications have been published within this topic receiving 158610 citations.
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TL;DR: In this paper, the deionizing (DI) bed of ion exchange resin beads that purifies water was investigated. And the particle crushing force was found to be closely represented by normal and Weibull distributions.
Abstract: One of the most critical components in the oxygen-generation and water-processing assemblies for human habitation in space is the deionizing (DI) bed—a packed bed of ion-exchange resin beads—that purifies water. The DI bed shrinks during the course of its operation, and therefore, for the bed to work satisfactorily, it must be kept properly compressed. To understand the force-transferring mechanism along the bed, sets of experimental programs were developed and conducted on the individual particles and bed samples of a DI granular material, Amberlite IRN-78. The presence of water reduced the load-bearing capacity of the individual particles, because most of the wet (water submerged) particles tested failed under relatively small crushing force, whereas the dry particles withstood a much higher load. The particle crushing force was found to be closely represented by normal and Weibull distributions. The DI material bed has a relatively small internal friction angle (shear strength). The lateral pre...
Patent•
24 Dec 2020
TL;DR: In this article, a pre-treatment system for removing carbon dioxide from a natural gas by bringing an absorption liquid into contact with the natural gas is presented. But the system is not suitable for the removal of carbon dioxide that has leaked due to an operation change even when the operation change occurs in a carbon dioxide removal part.
Abstract: [Problem] To provide a technology for removing, from a natural gas, carbon dioxide that has leaked due to an operation change even when the operation change occurs in a carbon dioxide removal part for removing the carbon dioxide contained in the natural gas by using an absorption liquid. [Solution] This natural gas pretreatment system is provided with: a carbon dioxide removal part 13 for removing carbon dioxide from a natural gas by bringing an absorption liquid into contact with the natural gas; and a moisture removal part 14 for removing moisture by circulating the natural gas through a packed bed containing a moisture adsorbent, wherein the packed bed contains a carbon dioxide adsorbent for adsorbing and removing the carbon dioxide which has not been completely removed in the carbon dioxide removal part 13, and, at an outlet side of the moisture removal part 13, the concentration of carbon dioxide included in the natural gas is measured by an outlet-side carbon dioxide measurement part 36.
01 Dec 1982
TL;DR: In this article, effective thermal conductivities on packed bed, effects of thermal conducitivity and friciton factor according to change of porosity and Reynolds number (Reh), and pressure loss of the fluid, are experimentally investigated.
Abstract: Heat transfer on packed bed is considered to be important for the effective designs of chemical reaction equipment, air conditioning system, and storage type heat exchanger, etc. Currently studies are being carried out quite actively in this field in order to increase the heat transfer effeciency.
The effect of heat transfer is closely related to materials, shapes, porosities and packing states of packed bed as well as mutual dimensional relations between particles and the container. Investigation shows that heat transfer results appear to be influenced by such parameters as fluid velocity through packed bed, mass flow, and thermal properties. It is noted that viscosity is also considered to be an important factor in this problem.
In this study, effective thermal conductivities on packed bed, effects of thermal conductivity (Ke) and friciton factor (Fk) according to change of porosity ( e) and Reynolds number (Reh), and pressure loss of the fluid, are experimentally investigated.
Results show that the effective thennal conductivity increases and the friction factor decreases, as against the increase of Reynolds number. But as the increase of porosity increase them both.
TL;DR: In this paper, the authors compared the use of channeled monoliths, "honeycomb" structures, with a packed bed, both made of the same type of activated carbon, and the intrinsic permeability and performance of both structures during the adsorption of a bioactive peptide from a crude hydrolyzate were studied.
TL;DR: In this article, the effect of exhaust gas velocity during sintering was studied and the M.Fe productivity of lower charging was compared with that of the packed bed in which the carbon composite iron ore green balls were mixed with the ordinary raw materials and charged, called mixed charging.
Abstract: In order to improve the metallic iron (M.Fe) productivity of partially reduced agglomerates production in packed bed with air flow, the packed bed of which the carbon composite iron ore green balls were charged lower side and the ordinary raw materials are charged on them, called lower charging, were examined. The M.Fe productivity of lower charging were compared with that of the packed bed in which the carbon composite iron ore green balls were mixed with the ordinary raw materials and charged, called mixed charging. Also, the effect of exhaust gas velocity during sintering was studied. As a result, the M.Fe productivity of lower charging was higher than that of mixed charging because reduced agglomerates placed upper side of the packed bed were easier to be re-oxidized. In addition, when the exhaust gas velocity was too slow, the time for re-oxidization was extended so that the M.Fe productivity decreased. However, when the exhaust gas velocity was too fast, the excess of free C combustion or re-oxidization of reduced agglomerates was caused so that the M.Fe productivity decreased, too. Therefore, there is a exhaust gas velocity which make the M.Fe productivity be highest. In this study, the M.Fe productivity achieved 0.21 M.Fe-t/m2/h with lower charging and 0.19 Nm/s of exhaust gas velocity.