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Title: Structural-chemical modeling of transition of coals to the plastic state

Abstract

The structural-chemical simulation of the formation of plastic state during the thermal treatment (pyrolysis, coking) of coals is based on allowance for intermolecular interactions in the organic matter. The feasibility of transition of coals to the plastic state is determined by the ratio between the onset plastic state (softening) and runaway degradation temperatures, values that depend on the petrographic composition and the degree of metamorphism of coals and the distribution of structural and chemical characteristics of organic matter. 33 refs., 8 figs., 2 tabs.

Authors:
;  [1]
  1. FGUP Institute for Fossil Fuels, Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
21037051
Resource Type:
Journal Article
Resource Relation:
Journal Name: Solid Fuel Chemistry (English Translation); Journal Volume: 41; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; PYROLYSIS; COKING; ORGANIC MATTER; MATHEMATICAL MODELS; VITRINITE; DECOMPOSITION; PLASTICITY

Citation Formats

A.M. Gyul'maliev, and S.G. Gagarin. Structural-chemical modeling of transition of coals to the plastic state. United States: N. p., 2007. Web. doi:10.3103/S0361521907010053.
A.M. Gyul'maliev, & S.G. Gagarin. Structural-chemical modeling of transition of coals to the plastic state. United States. doi:10.3103/S0361521907010053.
A.M. Gyul'maliev, and S.G. Gagarin. Thu . "Structural-chemical modeling of transition of coals to the plastic state". United States. doi:10.3103/S0361521907010053.
@article{osti_21037051,
title = {Structural-chemical modeling of transition of coals to the plastic state},
author = {A.M. Gyul'maliev and S.G. Gagarin},
abstractNote = {The structural-chemical simulation of the formation of plastic state during the thermal treatment (pyrolysis, coking) of coals is based on allowance for intermolecular interactions in the organic matter. The feasibility of transition of coals to the plastic state is determined by the ratio between the onset plastic state (softening) and runaway degradation temperatures, values that depend on the petrographic composition and the degree of metamorphism of coals and the distribution of structural and chemical characteristics of organic matter. 33 refs., 8 figs., 2 tabs.},
doi = {10.3103/S0361521907010053},
journal = {Solid Fuel Chemistry (English Translation)},
number = 1,
volume = 41,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}
  • High speed pressing and its attendant time advantages are largely governed by the quality of the coal, the pressure requirement, isothermal residence before pressing and the required end strength. Increasing the pressing pressure not only raises end strength as a result of comprehensive caking action but also extends the range of strength within the capacity of a charge of given compilation; it also reduces the pressing time without detracting from end quality. Isothermal residence is critical as it determines the forming behaviour of the coal and the coke quality variation limits. In a typical case, extension of residence from 20more » to 60 seconds enabled a gas coal to be formed satisfactorily in a 0.15s press routine at the moderate pressure of 1-2 MPa, giving a double strength product.« less
  • A method is described for determining the rheological parameters of coals and coal charges with a grain size of up to 3 mm in the plastic state. For this purpose a viscometer is used with a falling coaxial cylinder. The method developed permits the elimination of the distortion of the results obtained when the sample swells and its properties change continuously with time. The rheological parameters of a number of coals in the state of greatest softening are given. The results obtained have been used to develop a mathematical model of the coal-caking process. 5 refs.
  • The scientific principles of charge blending can only be developed on the basis of further data on the interactions between constituents in the plastic state. This article is concerned with the interactions between coals in different blends as revealed by the quantitative and qualitative data on the liquid phase extracted from the plastic mass by the KhPI centrifuge test. The results of research on alternative blends of graded Donbas coals show that coals from the Western Donbas reduce caking capacities significantly.
  • The plastic state of coals and features of the properties of well caking coals are discussed. 18 refs.