The study of the waste plastics recycling process using the coke oven

Kato, Kenji; Komaki, Ikuo; Nomura, Seiji; Uematsu, Hiroshi; Kondoh, Hirotoshi; Shiraishi, Kimio

doi:10.1299/jsmeenv.2000.10.154

Cited by 5 publications

(16 citation statements)

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“…Heat is supplied from the combustion flues which are separated from the coking chamber by silica brick walls, and coal is transformed to coke through a stage of softening and cohesive zone as shown in Fig. 6 [7]. High-temperature COG leaving the coking chamber, which includes tar component, ammonia, water and so forth in gas phase, is flushed with the ammonia liquor at the gas exit part of the coking chamber (which is called the 'gooseneck'), and cooled to about 80°C.…”

Section: Outline Of Cokemaking Processmentioning

confidence: 99%

“…8 [6]. In this experiment, 100 g of plastic samples were carbonized, and the amounts of decomposition products of plastics [solid residue (coke), liquid (tar and light oil) and gas (COG)] were measured.…”

Section: Investigation On the Waste Plastic-recycling Process Using Cmentioning

confidence: 99%

“…Finally, the conversion rates of waste plastics into various products were investigated in a commercial-scale coke oven [6,7]. Tables 1 and 2 show the ultimate analysis and ash contents of waste plastics and the component of waste plastics, respectively.…”

Section: Investigation On the Waste Plastic-recycling Process Using Cmentioning

confidence: 99%

“…Therefore, it is necessary to pre-treat the collected waste plastics and change their shape and size to make them suitable for charging into coking chambers. Figure 16 shows the waste plastics pre-treating flow [6][7][8]. First, metals are removed from the waste plastics using magnetic sorting.…”

Section: Influence Of Plastic Addition On Coke Qualitymentioning

confidence: 99%

“…In the latter process, waste plastics are used to produce coke, coke oven gas (COG) and hydrocarbon oil in a coke oven [6,7]. Coke is produced in a coke oven by carbonizing (heat treating without oxygen at high temperature) coal.…”

Section: Introductionmentioning

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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Section: Outline Of Cokemaking Processmentioning

confidence: 99%

Section: Investigation On the Waste Plastic-recycling Process Using Cmentioning

confidence: 99%

Section: Investigation On the Waste Plastic-recycling Process Using Cmentioning

confidence: 99%

Section: Influence Of Plastic Addition On Coke Qualitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of Waste Plastics in Coke Oven: A Review

Nomura

2015

J. Sustain. Metall.

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Waste plastics recycling process using coke ovens

Kato

Nomura

Uematsu

2003

Journal of Material Cycles and Waste Management

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The Japan Iron and Steel Federation (JISF), as its voluntary energy-saving action plan, proposed a 10% energy reduction by 2010 with 1990 as the basis. Further, it has suggested an additional 1.5% energy saving by the use of waste plastics as a metallurgical raw material. The amount of processing of waste plastics which corresponds to this amount of energy conversion is about 1 million t scale during 1 year. Conventional known methods for recycle-processing of waste plastics include, for example, the method of injection into a blast furnace to use waste plastics as an iron-ore reducing agent instead of coal. On the other hand, the coking process is considered to be suitable as a waste plastic recycling facility because the process involves coal carbonization in a high-temperature and reducing atmosphere. Carbonization tests with mixed waste plastics were conducted with laboratory equipment and in actual coke ovens. As a result, it was confirmed that the waste plastics recycling process using coke ovens is feasible. Therefore, a waste plastics recycling process using coke ovens was started as a chemical recycling technology at Nippon Steel.

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CO2 reduction potentials by utilizing waste plastics in steel works

Sekine

Fukuda

Kato

et al. 2009

Int J Life Cycle Assess

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Background, aim, and scope Feedstock recycling has received attention as an effective method to recycle waste plastics. However, estimating the reduction potential by life cycle assessment using coke oven and blast furnace in steel works has been a challenging task due to the complex structure of energy flow in steel works. Municipal waste plastics consist of several plastic resins. Previous studies have generally disregarded the composition of waste plastics, which varies significantly depending on the geographical area. If the reduction potentials by using each plastic resin in steel works can be quantified, the potential of municipal waste plastics (mixtures of plastic resins) can be estimated by summing up the potential of each resin multiplied by the composition of each resin in municipal waste plastics. Therefore, the goal of this study is to investigate the reduction potentials of CO 2 emissions by using individual plastic resins (polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET)) and those for municipal waste plastics in the coke oven and blast furnace. Materials and methods A model was developed to clarify the energy flow in steel works. In order to estimate the changes in energy and material balance in coke ovens when waste plastics are charged, the equations to calculate the coke product yield, gas product yield, and oil product yields of each plastic resin were derived from previous studies. The Rist model was adopted to quantify the changes in the inputs and outputs when plastics were fed into a blast furnace. Then, a matrix calculation method was used to calculate the change in energy balance before and after plastics are fed into a coke oven. Results It was confirmed that product yields of municipal waste plastics (mixtures of plastic resins) could be estimated by summing up the product yield of each plastic resin multiplied by the composition of each resin in municipal waste plastics. In both cases of coke oven and blast furnace feedstock recycling, the reduction potential of CO 2 emissions varies significantly depending on the plastic resins. For example, in the case of coke oven chemical feedstock recycling, the reduction potential of PS and PP is larger than that of PE. On the other hand, in the case of blast furnace feedstock recycling, PE has the largest CO 2 emissions reduction potential, whereas the CO 2 emission reduction potential of PP is smaller than those of PE and PS. In both cases, PET has negative CO 2 emission reduction potentials, i.e., there is an increase of CO 2 emissions. In addition, the reduction potentials of CO 2 emissions are slightly different in each city. Discussions The differences in the reduction potentials of CO 2 emissions by coke oven chemical feedstock recycling of each plastic resin is attributable to the differences in calorific values and coke product yields of each plastic resin. On the other hand, the difference in the CO 2 emission reduction potential for each plastic resin in blast furnace feedstock recycling is att...

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The study of the waste plastics recycling process using the coke oven

Cited by 5 publications

References 0 publications

Use of Waste Plastics in Coke Oven: A Review

Use of Waste Plastics in Coke Oven: A Review

Waste plastics recycling process using coke ovens

CO2 reduction potentials by utilizing waste plastics in steel works

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