Upper Limits to Combustibility of Pulverized Coal in Blast Furnace Raceway and Desirable Injection Position

Tamura, Kenji; Ueno, Hideki; Yamaguchi, Kazuyoshi; Sugata, Masayasu; Amano, Shigeru; Yamaguchi, Kazushige

doi:10.2355/tetsutohagane1955.77.6_775

Cited by 14 publications

(13 citation statements)

References 3 publications

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“…Regarding the hardness of these particles, the crushed particle has a larger value than the agglomerated particle. The fuel equivalence ratio 9) of waste plastics and pulverized coal are 1.93 and 2.11 respectively. The details of analysis methods as shown in Fig.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…These finding is basically different from the behavior of pulverized coal which is conventionally used as a fuel. 9) In the case of pulverized coal, the combustion efficiency decreased with an increase in particle diameter. 9) On the contrary, coarse plastics particles shows higher combustion and gasification efficiency than fine plastics particles.…”

Section: Change Of Raceway Phenomena By Plastics In-mentioning

confidence: 99%

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Development of Waste Plastics Injection Process in Blast Furnace.

et al. 2000

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At Keihin No. 1 Blast Furnace, waste plastics recycling system was installed in Oct. 1996. Before the installation of that system, the behavior of waste plastics injected into the blast furnace has been studied with the raceway hot model and the commercial blast furnace so as to investigate the possibility of effective waste plastics utilization in the blast furnace. From the observation of plastics particle injected into the raceway of blast furnace, it was estimated that combustibility of coarse plastics was much different from that of pulverized coal. The combustion point of coarse plastics located to deep domain in raceway compared with that of pulverized coal. Although C 1 -C 4 hydrocarbons due to the decomposition of plastics was detected in in-furnace, the decomposition products of plastics in the blast furnace top gas and dust were the same as that of pulverized coal injection. The preparation method of plastics had an influence on the combustion and gasification behavior in the raceway. The coarse plastics gave high combustion and gasification efficiency compared with fine plastics and pulverized coal, and CO 2 gasification rate of unburnt char derived from waste plastics was much higher than that of pulverized coal. Thus, it was concluded that coarse waste plastics could be effectively utilized as a reducing agent in the blast furnace. On the basis of above results, the waste plastics recycling system was designed.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Change Of Raceway Phenomena By Plastics In-mentioning

confidence: 99%

Development of Waste Plastics Injection Process in Blast Furnace.

et al. 2000

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“…This high-vicious Ϫ1 mm fine and high CaO/SiO 2 Ϫ1 mm fine and dripping slag between raceway and in dead man, with the increase of Ϫ3 mm fine, might be one of the main causes deteriorating the gas and liquid permeabilities at the dead man surface and lowering the temperature with increase of dripping slag hold-up. The ratio of unburnt char increases in the case of air ratio less than 0.80 15) during high PCR and low FR. The increase of this unburnt char might be one of the causes deteriorating the gas and liquid permeabilities at the dead man by the increase of the slag viscosity due to its suspension to the dripping slag and the increase of Ϫ3 mm fine due to its preferential reaction with FeO slag and CO 2 .…”

Section: Viscosity and Melting Point Of Dripping Slag Andmentioning

confidence: 99%

“…19) because of air ratio more than 0.80. 15) Figure 18 shows the behavior of pulverized coal ash in the raceway under high PCR operation and a mechanism lowering the gas and liquid permeabilities at the dead man surface, which have been arranged based on the views put forth up to the previous Section. In the case of PCR being high, the viscosity of Ϫ1 mm fine at a range of 2 to 3 m from the tuyere nose increases due to ash originated in pulverized coal.…”

Section: Viscosity and Melting Point Of Dripping Slag Andmentioning

confidence: 99%

Behavior of Pulverized Coal Ash and Physical Properly of Dripping Slag under High Pulverized Coal Injection Operation.

Ichida

Orimoto

Tanaka³

et al. 2001

ISIJ International

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“…Peak Position in Raceway to Tuyere in High-PCR Operation and Countermeasures Figure 1 shows the calculation results of gas composition and gas temperature in the cases of all-coke operation and high-PCR operation (PCRϭ181 kg/t) obtained by the one-dimensional raceway model 4) developed by Tamura et al It is found therefrom that the CO 2 or temperature peak position of combustion, that is, CO 2 or gas temperature peak position in the case of high-PCR operation (PCRϭ181 kg/t) is getting nearer the tuyere than that in the case of allcoke operation. According to the hot model experiment results, it comes out that when the CO 2 or temperature peak position of combustion (peak position of gas temperature) comes near the tuyere, the furnace wall temperature at bosh (a place of 500 mm above the tuyere center) is rising.…”

Section: Points Involved In Approach Of Co 2 or Temperaturementioning

confidence: 99%