By K. Ishii
For you to lessen the price of working 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 dangerous results on gasoline move and permeability of the coke column. The capability of the furnace to devour those debris via resolution loss is maybe one of many obstacles to coal injection. it truly 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 technology (JSPS) and the Iron and metal Institute (ISIJ) to guage learn 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 reside furnace functions, and furnace functionality.
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Additional resources for Advanced Pulverized Coal Injection Technology and Blast Furnace Operation
5 p s. The film was analyzed by image processor to divide the image brightness into 255 graduations. The conditions for this experiment were: a gas velocity in the blowpipe of 82 m/s, a gas temperature of 120O0C,and a PC injection rate of 200 kglthm. Figure 3-3 shows one set of example photographs. One lance was placed above the blowpipe. The gas velocity in the injection lance was 15 mls. These high-speed photographs that were image-processed at different levels of luminescent intensity show the high-luminescence flames clearly.
Symp. 195. 16) R. H. Essenhigh, M. K. Misra and D. W. Shaw: Combust. 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.
Inaba:the146th,Nishiyama-Memorial-Lecture, ISIJ, (1993), 203. 3) M. Shimizu:Research Group of Pulverized Coal Combustion in Blast Furnace1(1995),JSPS54. Kamijo:Tetsuto- Hagane,81(1995),1114. 54-2037 (1995) CHAPTER 2 Characteristics of pulverized coal combustion A large number of types of coal imported into Japan from many foreign countries. This situation suggests that the coal used in Japan is in great variety, and this requires that the combustion technologies have to be developed to apply to any coal to attain high combustion efficiency and low environmental pollution.
Advanced Pulverized Coal Injection Technology and Blast Furnace Operation by K. Ishii