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Title: Slag transport models for vertical and horizontal surfaces. [SLGTR code]

Abstract

In a coal-fired MHD system, all downstream component surfaces that are exposed to combustion gases will be covered by a solid, liquid, or solid-liquid film of slag, seed, or a mixture of the two, the specific nature of the film depending on the physical properties of the slag and seed and on local conditions. An analysis was made of a partly-liquid slag film flowing on a cooled vertical or horizontal wall of a large duct, through which passed slag-laden combustion gases. The model is applicable to the high-temperature steam generators in the downstream system of an MHD power plant and was used in calculations for a radiant-boiler concept similar to that in the 1000-MWe Gilbert-STD Baseline Plant study and also for units large enough for 230 and 8 lb/s (104.3 and 3.5 kg/s) of combustion gas. The qualitative trends of the results are similar for both vertical and horizontal surfaces. The results show the effects of the slag film, slag properties, and gas emissivity on the heat flux to the steam tubes. The slag film does not reduce the rate of heat transfer in proportion to its surface temperature, because most of the heat is radiated from the gas andmore » particles suspended in it to the slag surface.« less

Authors:
;
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
OSTI Identifier:
6798999
Alternate Identifier(s):
OSTI ID: 6798999
Report Number(s):
ANL/MHD-78-1
DOE Contract Number:
W-31-109-ENG-38
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; COAL-FIRED MHD GENERATORS; SLAGS; COMPUTER CODES; S CODES; FLOW MODELS; COMBUSTION PRODUCTS; COMPUTER CALCULATIONS; FILMS; FLOW RATE; HEAT TRANSFER; MASS TRANSFER; MATHEMATICAL MODELS; MHD CHANNELS; PLASMA SEEDING; THERMAL CONDUCTIVITY; VISCOSITY; DIRECT ENERGY CONVERTERS; ENERGY TRANSFER; MHD GENERATORS; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES 300104* -- MHD Generators-- Duct Engineering & Fluid Dynamics

Citation Formats

Chow, L S.H., and Johnson, T R. Slag transport models for vertical and horizontal surfaces. [SLGTR code]. United States: N. p., 1978. Web. doi:10.2172/6798999.
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Chow, L S.H., & Johnson, T R. Slag transport models for vertical and horizontal surfaces. [SLGTR code]. United States. doi:10.2172/6798999.
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Chow, L S.H., and Johnson, T R. Sun . "Slag transport models for vertical and horizontal surfaces. [SLGTR code]". United States. doi:10.2172/6798999. https://www.osti.gov/servlets/purl/6798999.
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@article{osti_6798999,
title = {Slag transport models for vertical and horizontal surfaces. [SLGTR code]},
author = {Chow, L S.H. and Johnson, T R},
abstractNote = {In a coal-fired MHD system, all downstream component surfaces that are exposed to combustion gases will be covered by a solid, liquid, or solid-liquid film of slag, seed, or a mixture of the two, the specific nature of the film depending on the physical properties of the slag and seed and on local conditions. An analysis was made of a partly-liquid slag film flowing on a cooled vertical or horizontal wall of a large duct, through which passed slag-laden combustion gases. The model is applicable to the high-temperature steam generators in the downstream system of an MHD power plant and was used in calculations for a radiant-boiler concept similar to that in the 1000-MWe Gilbert-STD Baseline Plant study and also for units large enough for 230 and 8 lb/s (104.3 and 3.5 kg/s) of combustion gas. The qualitative trends of the results are similar for both vertical and horizontal surfaces. The results show the effects of the slag film, slag properties, and gas emissivity on the heat flux to the steam tubes. The slag film does not reduce the rate of heat transfer in proportion to its surface temperature, because most of the heat is radiated from the gas and particles suspended in it to the slag surface.},
doi = {10.2172/6798999},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1978},
month = {Sun Jan 01 00:00:00 EST 1978}
}
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Technical Report:
View Technical Report (2.38 MB)
DOI:  10.2172/6798999
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