By K. Ishii
With a view to lessen the price of operating blast furnaces (BFs), injected pulverized coal is used instead of coke to fireplace BFs. due to this, unburned effective fabrics are blown with the gasoline into the bosh and lifeless guy parts with attainable damaging results on fuel circulation and permeability of the coke column. The capability of the furnace to eat those debris by means of resolution loss is perhaps one of many obstacles to coal injection. it really is, accordingly, vital to appreciate the physicochemical and aerodynamic behaviour of fines together with the switch of in-furnace phenomena.
The Committee of Pulverized Coal Combustion and In-Furnace response in BF was once organize in 1993 as a cooperative examine of the Japan Society for the advertising of technological know-how (JSPS) and the Iron and metal Institute (ISIJ) to guage examine initiative into this challenge.
This publication stories at the JSPS/ISIJ Committee's actions and describes the translation of findings drawn from combustion experiments and the result of stay furnace purposes, and furnace functionality.
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Extra resources for Advanced Pulverized Coal Injection Technology and Blast Furnace Operation
32 2. 3 Char combustion In char combustion after evolving volatile matter, lump combustion in stoker boilers and coal stoves and so on, combustion behaviors inside a particle should be considered. Farben(BASF) Data - - - - - - - - . ' . ~ >. * .. * - . :,... ,. , ,: ;' . ,. 2-8 Relationship between burnout time and particle diameter of coal particle 2. CHARACTERISTICS OF PULVERIZED COAL COMBUSTION 33 It is also difficult to explain the detailed characteristics of combustion behavior there. Therefore, many kinds of modeling have been carried out.
1 Fez03 Fez03 H20 A1203 H20 Specifica gravity (kg m-3) Melting point (K) 2650 1983 2083 (Mullite) 2900 2500 3100 3100 3350 3350 2570 3100 4500 4200 5140 5200 4300 3400 'The specific gravity of silicate minerals is in the range of 2500 to 3500 kg m'3;it increases with A1203/Si02 ratio and decreases with Hz0 content. The silicates containing Na,K,CA,Mg,and Fe do not have a definite melting point temperature. b ~ i t the h exception of rutile, the oxide minerals rarely occur in coal. '~enotesloss of water.
3-8 Gas concentration change nearby injection lance 3. COMBUSTION BEHAVIOR OF PC PARTICLE GROUP 45 analyzed at the same facility. 3-8') These results indicate that the gas composition varies widely across the blowpipe immediately after the lance and demonstrate the large effect that flow patterns of PC particle groups have on combustion. 2 Effect of coal type Kugisaki et aL3)conducted an experiment using the experimental combustion apparatus shown in Fig. 3-9 to clarify the structural change of PC with combustion by injecting PC at a rate of 5 kg/h into vitiated air.