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Research Papers: Heat Exchangers

Process Intensification in a “Simulated Moving-Bed” Heat Regenerator

[+] Author and Article Information
D. S. Murthy1

Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Uttar Pradesh 208 016, India

S. V. Sivakumar, D. P. Rao

Department of Chemical Engineering, Indian Institute of Technology Kanpur, Uttar Pradesh 208 016, India

Keshav Kant

Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Uttar Pradesh 208 016, India

1

Corresponding author.

J. Heat Transfer 130(9), 091801 (Jun 18, 2008) (8 pages) doi:10.1115/1.2927397 History: Received July 23, 2006; Revised April 01, 2008; Published June 18, 2008

The solid-gas contacting for thermal storage and thermal recovery is generally carried out in fixed-bed regenerators. Compared to a fixed bed, higher thermal recovery can be achieved in a moving bed with countercurrent flow of gas and solids. However, the moving beds have not been widely used due to difficulties in solid handling. The relative movement of the bed to the gas flow can be simulated in a fixed bed by moving the inlet and outlet ports of the gas along the length of the bed. Similar simulated moving beds are already in use for adsorptive separation of liquid mixtures in chemical industries. A novel moving-port system is proposed to achieve simulated moving-bed operation in a fixed bed. We have carried out studies to evaluate the relative performance of the fixed and the simulated moving-bed heat regenerators. We have examined the feasibility of replacing a set of three blast furnaces and thermal regeneration of an adsorption bed with the simulated moving-bed regenerator. It is found that high-heat transfer intensification can be achieved. The results indicate that three blast-furnace stoves can be replaced by a simulated moving-bed regenerator of volume of about 100 times smaller than the stoves. The heat-transfer intensification is high enough to carry out thermal regeneration of the adsorption beds in a cycle time that is in the range of the pressure swing adsorption, which is favored for its faster rate of regeneration.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Temperature front propagation of gas and solid in fixed bed

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Figure 2

Moving-port assembly

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Figure 3

SMB heat regenerator

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Figure 4

Sketch of rotating-disk valve

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Figure 5

Effect of particle diameter on the zone length for cooling

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Figure 6

Effect of particle diameter on the zone length for heating

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Figure 7

Variation of pressure drop across the zone length with particle diameter for cooling

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Figure 8

Variation of pressure drop across the zone length with particle diameter for heating

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Figure 9

Effect of hydraulic diameter on the zone length for cooling

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Figure 10

Effect of hydraulic diameter on the zone length for heating

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Figure 11

Variation of pressure drop across the zone length with hydraulic diameter for cooling

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Figure 12

Temperature profiles for gas and solid in the cooling zone

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Figure 13

Temperature profiles for gas and solid in the heating zone

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Figure 14

Schematic of the thermal regeneration process using a SMB adsorber and an inert bed

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Figure 15

Effect of gas flow rate on zone lengths in SMB and fixed beds

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Figure 16

Effect of gas flow rate on pumping power in SMB and fixed beds

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Figure 17

Temperature profiles across the bed

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