By K. Ishii
To be able to lessen the price of operating blast furnaces (BFs), injected pulverized coal is used instead of coke to fireplace BFs. because of this, unburned wonderful fabrics are blown with the gasoline into the bosh and useless guy parts with attainable dangerous results on fuel circulation and permeability of the coke column. The potential of the furnace to eat those debris via answer loss is perhaps one of many boundaries 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 used to be organize in 1993 as a cooperative study of the Japan Society for the merchandising of technology (JSPS) and the Iron and metal Institute (ISIJ) to guage study initiative into this challenge.
This booklet studies at the JSPS/ISIJ Committee's actions and describes the translation of findings drawn from combustion experiments and the result of dwell furnace functions, and furnace functionality.
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Extra info for Advanced Pulverized Coal Injection Technology and Blast Furnace Operation
Coal has a recognizable physical and chemical structure which affects its reactive processes. Each property has some technological relevance to the 2. CHARACTERISTICS OF PULVERIZED COAL COMBUSTION 19 pulverized coal combustion process: i) Specific energy means the thermal value of each coal consignment. Ash content provides an estimate of the mineral matter content of a sample, thus indicating both the amount of inert material being processed through the combustor and the extent of the ash disposal required afterwards.
2-8. Under pulverized coal combustion summarized by Es~enhigh'~) conditions, generally, the burnout time is proportional to the square of the particle diameter since pulverized combustion is controlled by diffusion of oxygen surrounding each particle. 4 Combustion characteristics of a single coal particle Figure 3- 14 shows a series of photographs of an instantaneous flame around a single particle after being ignited. These photographs are taken by a high-speed camera and show change of the flame pattern over time.
Raask: "Mineral Impurities in Coal Combustion", Hemisphere (1985). 15) K. Ohtake: Proc. of 3rd Int. 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.