Advanced Pulverized Coal Injection Technology and Blast Furnace Operation

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K. Ishii
Elsevier, Nov 10, 2000 - Science - 324 pages
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In order to reduce the cost of running blast furnaces (BFs), injected pulverized coal is used rather than coke to fire BFs. As a result of this, unburned fine materials are blown with the gas into the bosh and dead man areas with possible detrimental effects on gas flow and permeability of the coke column. The capacity of the furnace to consume these particles by solution loss is probably one of the limitations to coal injection. It is, therefore, important to understand the physicochemical and aerodynamic behaviour of fines including the change of in-furnace phenomena.

The Committee of Pulverized Coal Combustion and In-Furnace Reaction in BF was set up in 1993 as a cooperative research of the Japan Society for the Promotion of Science (JSPS) and the Iron and Steel Institute (ISIJ) to evaluate research initiative into this problem.

This book reports on the JSPS/ISIJ Committee's activities and describes the interpretation of findings drawn from combustion experiments and the results of live furnace applications, and furnace performance.

 

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Contents

Chapter 1 IntroductionHigh rate PCI operation in Japan
1
Chapter 2 characteristics of pulverized coal combustion
15
Chapter 3 Combustion behavior of PC particle group
37
Chapter 4 PC Combustion in blast furnace
63
Chapter 5 Modeling of pulverized coal combustion
83
Chapter 6 Advanced injection lances for high rate PCI
123
Chapter 7 Phenomena in blast furnace with high rate PCI
133
Chapter 8 Generation of fine in blast furnace at high rate PCI
169
Chapter 9 Burden properties suitable for high rate PCI
217
Chapter 10 Upper limit of PCR
259
Index
299
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Page 18 - Subbituminous coal is difficult to distinguish from bituminous and is dull, black colored, shows little woody material, is banded, and has developed bedding planes. The coal usually splits parallel to the bedding. It has lost some moisture content, but is still of relatively low heating value. Bituminous coal is dense, compacted, banded, brittle, and displays columnar cleavage and a dark black color. It is more resistant to disintegration in air than are subbituminous and lignite coals.
Page 18 - The process of conversion of plant materials, such as peat, to coal is called "coalification" and takes place in stages producing a variety of coal products. Hendrickson (1975) provides the following description of some of these coal types: •Lignite, the lowest rank of coal, was formed from peat which was compacted and altered. Its color has become brown to black and it is composed of recognizable woody materials imbedded in pulverized (macerated) and partially decomposed vegetable matter. Lignite...
Page 18 - The higher rank coals are classified according to fixed carbon on the dry basis...
Page 18 - It is more resistant to disintegration in air than are subbituminous and lignite coals. Its moisture content is low, volatile matter content is variable from high to medium, and its heating value is high. Several varieties of bituminous coal are recognizable. Anthracite is the highly metamorphosed coal, is jet black in color, is hard and brittle, breaks with a conchoidal fracture, and displays a high luster. Its moisture content is low and its carbon content is high. Neither peat nor graphite are...
Page 16 - Brown Coals and Lignites - Classification by Types on the Basis of Total Moisture Content and Tar Yield...

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