By K. Ishii
For you to lessen the price of operating blast furnaces (BFs), injected pulverized coal is used instead of coke to fireside BFs. because of this, unburned tremendous fabrics are blown with the fuel into the bosh and useless guy components with attainable harmful results on gasoline move and permeability of the coke column. The potential of the furnace to eat those debris by means of resolution loss is perhaps one of many boundaries to coal injection. it's, consequently, very important 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 used to be manage in 1993 as a cooperative study of the Japan Society for the advertising of technology (JSPS) and the Iron and metal Institute (ISIJ) to judge study initiative into this challenge.
This ebook experiences 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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Additional info for Advanced Pulverized Coal Injection Technology and Blast Furnace Operation
The photographic images show these combustion flames. The photographs show different images corresponding to the distance from the lance. At distances of 150 and 300 mm from the injection lance, the flames are located somewhat above the center of the view from the observation hole and do not spread over the whole field of view. This indicates that combustion proceeds in a dispersed manner within the cross section of the blowpipe. At distances of 600 and 900 mrn from the lance, the combustion of PC spreads over the entire view.
Although depending on coal type, fixed carbon is also burnt during the volatile matter evolution. With the progress of combustion, particle temperature rapidly increases. After almost all the volatile matter is evolved, char combustion becomes dominant. The rate of char combustion is relatively slow compared to that of volatile matter evolution or combustion. Finally, ash is produced after the combustion completes. ive heat transfer I Burner nozzle Distance from the burner Fig. 2-4 Illustration of combustion phenomena of PC 28 2.
3. 17) Y. Yamamoto, T. Ohe, I. Naruse and K. Ohtake: Trans. Jpn. Soc. Mech. , ser. 649. 18) R. H. Essenhigh: Proc. of the 16th Symp. 353. This Page Intentionally Left Blank CHAPTER 3 Combustion behavior of PC particle group In a blast furnace, pulverized coal (PC) particles are injected into the hot blast from a lance with small diameter. The hot blast temperature is 1000 to 1200°C and the gas velocity of the hot blast is over 100-200 rn/s in the blowpipe and tuyere. Under these conditions, the injected PC particles are instantaneously heated in the hot blast; subsequently, they ignite and start burning.