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Title: Heat Transfer Models Of Moving Packed-Bed Particle-To-sCO2 Heat Exchangers.

Abstract

Abstract not provided.

Authors:
;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1427340
Report Number(s):
SAND2017-2712C
651686
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the ASME 2017 Power and Energy Conference held June 25-30, 2017 in Charlotte, North Carolina, United States.
Country of Publication:
United States
Language:
English

Citation Formats

Albrecht, Kevin, and Ho, Clifford K. Heat Transfer Models Of Moving Packed-Bed Particle-To-sCO2 Heat Exchangers.. United States: N. p., 2017. Web. doi:10.1115/ES2017-3377.
Albrecht, Kevin, & Ho, Clifford K. Heat Transfer Models Of Moving Packed-Bed Particle-To-sCO2 Heat Exchangers.. United States. doi:10.1115/ES2017-3377.
Albrecht, Kevin, and Ho, Clifford K. Wed . "Heat Transfer Models Of Moving Packed-Bed Particle-To-sCO2 Heat Exchangers.". United States. doi:10.1115/ES2017-3377. https://www.osti.gov/servlets/purl/1427340.
@article{osti_1427340,
title = {Heat Transfer Models Of Moving Packed-Bed Particle-To-sCO2 Heat Exchangers.},
author = {Albrecht, Kevin and Ho, Clifford K.},
abstractNote = {Abstract not provided.},
doi = {10.1115/ES2017-3377},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

Conference:
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  • Under a contract to investigate the interrelationships between temperature distribution, fluid flow, boiler size and heat exchanger design in a fossil-fuel fired fluidized bed combustor a 1-ft and a 3-ft dia bed with attendant instrumentation were designed, built, and tested. Heat transfer results obtained in the 1-ft dia facility are presented. The results indicate that by a proper distribution of the fluidizing gas at the grid, the steam generating surface of the boiler can be reduced significantly. These results thus imply that for a given boiler configuration, one can obtain significantly more steam generation by changing the injection path atmore » the fluidizing grid. In addition, the experimental results obtained utilizing the 1-ft-dia bed have shown that vertical tube arrangements are more efficient than horizontal tube arrangements in the low velocity range. The ongoing investigation is performed by utilizing an external heat source (a gas burner). This approach is justified (as a first approach) since coal combustion in a fluidized bed is very rapid and most of the combustion occurs near the injection point. The investigation has concentrated on studying the fluid mechanics in fluidized beds packed with heat exchangers, developing proper instrumentation for making detailed measurements in the bed, constructing versatile units which can be easily modified, and determining the effects of scale. A large data base has been derived from the 1-ft unit under a wide variety of conditions. Transient measurements taken in the bed have explained the more efficient performance of pressurized vessels.« less
  • Abstract not provided.
  • Abstract not provided.
  • There is a trend towards designing and operating reactors close to runaway conditions to maximize productivity for economic reasons. This requires accurate physical properties, kinetics, and heat transfer correlations. In spite of the large number of studies of radial heat transfer inside tubular packed beds, the published correlations are not in close agreement and often do not accurately predict heat transfer performance of industrial packed-bed tubular reactors. It is therefore necessary to measure the heat transfer performance of a given combination of particle geometry (i.e., shape, size, and material) and tube diameter at the same superficial velocities experienced in themore » full-scale reactors. Relatively simple and inexpensive experimental apparatus and procedures were used to obtain accurate data over a wide range of operating conditions for estimating the inside wall heat transfer coefficient and the effective radial thermal conductivity. Correlations of these parameters developed from in-house data resulted in much-improved predictions of an actual plant reactor and agreed well with the overall heat transfer coefficient obtained from a reactor heat balance. At sufficiently high Reynolds number (Re > 300--500), the equations h{sub w}D{sub p}/k{sub f} = Pr{sup 1/3}Re{sup 1/2} and k{sub r,e}/k{sub f} = RePr/Pe{sub r}{sup {infinity}} accurately correlate the radial heat transfer data as a function of Reynolds number. The effective radial thermal conductivity is independent of particle conductivity under industrial reaction conditions (i.e., high flow rates).« less