Reduction Effects of CO&lt;SUB&gt;2&lt;/SUB&gt; Emission from Steel Products by Reduction Agent Injection into Blast Furnace

Narita, Nobuhiko; Sagisaka, Masayuki; Inaba, Atsushi

doi:10.2320/jinstmet1952.65.7_589

Cited by 6 publications

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“…If surplus gas was generated from the coal and waste plastics, the gas was assumed to be used for the generation of electricity in a joint thermal power plant with an efficiency of 38% (Narita et al 2001). The CO 2 emission intensity of electricity and oil production were assumed to be 0.45 kg CO 2 /kWh (Matsuno and Betz 2000).…”

Section: Matrix Calculation To Estimate the Energy And Materials Flow mentioning

confidence: 99%

“…In recent years, studies targeting feedstock recycling have been increasing, and the estimation of the environmental effect by feedstock recycling has attracted interest (Plastic Waste Management Institute 2005a; Molgaard 1995;Song et al 1999;Arena et al 2003;Ross and Evans 2003;Holmgren and Henning 2004;Finnveden et al 2005;Noda et al 2001;Perugini et al 2005;Narita et al 2001;Ziebik and Stanek 2001;Inaba et al 2005).…”

Section: Introductionmentioning

confidence: 98%

“…There have been some attempts to estimate the reduction potential of environmental impact by feedstock recycling of waste plastics in steel works in which life cycle assessment (LCA) was applied (Narita et al 2001;Ziebik and Stanek 2001;Inaba et al 2005). Inaba et al reviewed these previous studies in great detail and discussed the influence of setting system boundaries because there was no consistency in previous studies (Inaba et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Matrix Calculation To Estimate the Energy And Materials Flow mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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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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“…Keywords: Blast furnace feedstock recycling; coke oven chemical feedstock recycling; composition of waste plastics; life cycle inventory analysis; matrix calculation method Vol.5 No.4 る。 (P l a s t i c W a s t e M a n a g e m e n t I n s t i t u t e 2005a ; Molgaard 1995;Song et al 1999;Arena, et al 2003;Ross & Evans 2003;Holmgren & Henning 2004;Finnveden et al 2005;Noda et al 2001;Perugini et al 2005;Narita et al 2001;Ziebik & Stanek 2001;Inaba et al 2005) 製鉄所における廃プラスチックのフィードストックリサイクルの環境負荷への影響を推計するのに、LCAを適用した既存研究はいくつか行われている。 (Narita et al 2001;Ziebik & Stanek 2001;Inaba et al 2005 Table 7. CO 2 emissions when 1 ton of PE is fed into coke oven Table 9.…”

Section: Recommendation and Perspectivesunclassified

CO2 Reduction Potentials by Utilizing Waste Plastics in Steel Works

SEKINE¹,

FUKUDA²,

Kato³

et al. 2009

Journal of Life Cycle Assessment, Japan

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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 LCA 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 (PE, PP, PS, 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 attributable to the difference in calorific values and the carbon and hydrogen content of e...

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Blast furnace feedstock and coke oven chemical feedstock

Nomura

2020

Plastic Waste and Recycling

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Reduction Effects of CO<SUB>2</SUB> Emission from Steel Products by Reduction Agent Injection into Blast Furnace

Cited by 6 publications

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CO2 reduction potentials by utilizing waste plastics in steel works

CO2 reduction potentials by utilizing waste plastics in steel works

CO2 Reduction Potentials by Utilizing Waste Plastics in Steel Works

Blast furnace feedstock and coke oven chemical feedstock

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