Development of Waste Plastics Injection Process in Blast Furnace.

Asanuma, Minoru; Ariyama, Tatsuro; Sato, Michitaka; Murai, Ryota; Nonaka, Toshiharu; Okochi, Iwao; Tsukiji, Hideaki; Nemoto, Kenichi

doi:10.2355/isijinternational.40.244

Cited by 105 publications

(57 citation statements)

References 6 publications

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“…The fundamental studies revealed it was feasible to inject coarse grains of waste plastics into blast furnace as an alternative to pulverized coal. 19,20) In 1999 injection quantity of waste plastics reached 45 000 tons in Japan, 21) and in 1996 the largest injection rate attained 60 kg/thm in Germany. 22) In this study, injection of hydrogen bearing matters, including humidified blasting (hereinafter abbreviated to HB), natural gas injection (NGI) and waste plastics injection (PLI) are investigated through numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Injection of Hydrogen Bearing Materials into Blast Furnace

2004

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Injection of hydrogen bearing matters into blast furnace has been attracting technical and scientific interests aimed to improve the furnace performance through enhancing hydrogen reduction. In this study, the operations of humidified blasting, natural gas and waste plastics injections are numerically examined in comparison with all-coke operation by means of multi-fluid blast furnace model. The model evaluations are carried out under constant raceway conditions and hot metal temperature throughout all tested cases. Since the injection of hydrogen bearers changes raceway conditions, the blast conditions that are used for model computation as tuyere inlet boundary condition, including blast rate, oxygen enrichment, temperature and humidity, are suitably adjusted to maintain raceway temperature and bosh gas flow rate. The model simulations reveal that in-furnace temperature level lowers while the enhancement of hydrogen reduction reduces the ratio of direct reduction with hydrogen bearer injection. The productivity improves, and coke rate shows a little increase in humidified blasting operation while it obviously decreases in the injections of natural gas and waste plastics. The other two cases, namely, natural gas and waste plastics injections, show remarkable improvement of furnace efficiency. The decrease in heat demands by direct reduction, solution loss and silicon transfer reactions contributes to the improvement of blast furnace efficiency with respect to hydrogen bearer injection.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Injection of Hydrogen Bearing Materials into Blast Furnace

2004

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“…One was ''light'' waste plastic having the apparent density of 0.52-0.56 g/cm 3, and the other was ''heavy'' plastic having the apparent density of 0.86 g/cm 3 . In the case of the light waste plastic, as shown in Fig.…”

Section: Influence Of Plastic Addition On Coke Qualitymentioning

confidence: 99%

“…where W is the mass of added plastic (g), N is the number of the added plastic particles, q is the plastic density (g/cm 3 ), r is the mean radius of the plastic (cm) and SA (cm 2 /g) is the specific surface area of the added plastic particles. As shown here, the total surface area is inversely proportional to the plastic radius and density.…”

Section: Influence Of Plastic Addition On Coke Qualitymentioning

confidence: 99%

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Use of Waste Plastics in Coke Oven: A Review

Nomura

2015

J. Sustain. Metall.

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To help in building a recycling-oriented sustainable society, Nippon Steel & Sumitomo Metal Corporation developed a waste plastic-recycling process using coke oven and put it into commercial operation in 2000. Now roughly 200,000 tons per year of waste plastics are processed in coke oven in Japan. In this process, the waste plastics collected from households are agglomerated to the sizes ranging from 20 to 30 mm in diameter and charged into coke ovens with coal at the blending ratio of about 1 mass%. Waste plastics are thermally decomposed into approximately 20 mass% coke, 40 mass% hydrocarbon oil (tar and light oil) and 40 mass% coke oven gas, which are utilized as iron ore-reducing agents in blast furnaces, raw materials for the chemical industry, and a fuel for power plants, respectively. Moreover, 92 mass% of the chlorine in waste plastics is released and absorbed by the ammonia liquor spray for cooling hot coke oven gas and converted to ammonium chloride. The waste plastic-recycling process using coke ovens is superior in that a large amount of waste plastics can be treated, useful materials can be recovered using the existing facilities, coke quality can be kept the same and the chlorine released from waste plastics can be fixed in the existing ammonia liquor spray system.

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“…The utilization of waste plastics in the blast furnace has been reported in several papers. [4][5][6] However, the massive combustion technology of waste plastics under the low oxygen excess rate is required for lowering reducing agent rate remarkably. Some studies on low temperature reduction of wustite or lowering carburization temperature of metal have been reported.…”

Section: Introductionmentioning

confidence: 99%

Design of Innovative Blast Furnace for Minimizing CO2 Emission Based on Optimization of Solid Fuel Injection and Top Gas Recycling

Murai¹,

Sato²,

Ariyama³

2004

ISIJ International

Self Cite

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The concept of innovative ironmaking process for aiming at energy half consumption has been proposed based on the basic experiments and mathematical calculations. For innovative ironmaking process, intensive combustion technology around raceway was examined by hot model experiments and three-dimensional mathematical simulation so as to utilize solid fuel such as plastics effectively. As results, it became clear that simultaneous injection of pulverized coal/plastics or pulverized coal/gas fuels is favorable to improve combustion efficiency remarkably. Decrease in thermal reserve zone temperature and top gas recycling besides plastics injection are found to be effective for lowering coke rate. In this process, productivity can be also improved owing to relaxation of flooding condition in the lower part of blast furnace. Productivity of 3.5 and more, that is determined by fluidization condition at top, can be expected in this innovative ironmaking process. Totally, it is evaluated that amount of carbon emission would be reduced by eighty-six percent provided sequestration of carbon dioxide is implemented. Finally, integrated ironmaking process with co-generating oxygen production process was proposed.

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Development of Waste Plastics Injection Process in Blast Furnace.

Cited by 105 publications

References 6 publications

Numerical Analysis on Injection of Hydrogen Bearing Materials into Blast Furnace

Numerical Analysis on Injection of Hydrogen Bearing Materials into Blast Furnace

Use of Waste Plastics in Coke Oven: A Review

Design of Innovative Blast Furnace for Minimizing CO2 Emission Based on Optimization of Solid Fuel Injection and Top Gas Recycling

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