CO 2 emission reduction and exergy analysis of smart steelmaking system adaptive for flexible operating conditions

Shinnosuke Hisashige, Takao Nakagaki, Takaiku Yamamoto

研究成果: Article

抄録

The iron and steel industry accounts for approximately 45% of the CO 2 emissions in the Japanese industrial sector, and therefore is investing in improvements to reduce the CO 2 emissions. Current projections are for the stock of scrap iron and steel products to increase in the future. Being already in the reduced state, such scrap can be regenerated to steel with lower CO 2 emissions than iron ore. The “Packed bed type Partial Smelting Reduction process” (PSR), which concurrently smelts scrap and reduces iron ore, is a promising method to utilize scrap iron. This work evaluates the feasibility of combining PSR with top gas recycling, a process commonly called the ‘SMART steelmaking system’. In the SMART system, CO 2 derived from the PSR gas is reduced into CO or CH 4 and recycled to the furnace as a reducing agent. The integrated whole process including shaft furnace, CO 2 electrolysis, pressure swing adsorption, and other conventional auxiliary systems was modelled in Aspen Plus, and CO 2 emissions reduction and exergy analysis of the system adaptive for flexible operating conditions was performed. Increasing the scrap ratio by 5% consistently lead to a 4% reduction in CO 2 emissions. Similarly, increasing the CO input rate by 100 kg/THM consistently resulted in a reduction of CO 2 emissions of approximately 3%. The maximum CO 2 emissions reduction of 22% was achieved at the condition of the operably highest scrap ratio and CO input rate.

元の言語English
ページ(範囲)598-606
ページ数9
ジャーナルISIJ International
59
発行部数4
DOI
出版物ステータスPublished - 2019 4 1

Fingerprint

Exergy
Steelmaking
Adaptive systems
Carbon Monoxide
Smelting
Iron scrap
Iron ores
Furnaces
Steel scrap
Iron and steel industry
Packed beds
Reducing agents
Gases
Electrolysis
Recycling
Steel
Reducing Agents
Adsorption

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

これを引用

CO 2 emission reduction and exergy analysis of smart steelmaking system adaptive for flexible operating conditions . / Hisashige, Shinnosuke; Nakagaki, Takao; Yamamoto, Takaiku.

:: ISIJ International, 巻 59, 番号 4, 01.04.2019, p. 598-606.

研究成果: Article

@article{d9f32befe9d6494fb0a5dcbb5ae860e7,
title = "CO 2 emission reduction and exergy analysis of smart steelmaking system adaptive for flexible operating conditions",
abstract = "The iron and steel industry accounts for approximately 45{\%} of the CO 2 emissions in the Japanese industrial sector, and therefore is investing in improvements to reduce the CO 2 emissions. Current projections are for the stock of scrap iron and steel products to increase in the future. Being already in the reduced state, such scrap can be regenerated to steel with lower CO 2 emissions than iron ore. The “Packed bed type Partial Smelting Reduction process” (PSR), which concurrently smelts scrap and reduces iron ore, is a promising method to utilize scrap iron. This work evaluates the feasibility of combining PSR with top gas recycling, a process commonly called the ‘SMART steelmaking system’. In the SMART system, CO 2 derived from the PSR gas is reduced into CO or CH 4 and recycled to the furnace as a reducing agent. The integrated whole process including shaft furnace, CO 2 electrolysis, pressure swing adsorption, and other conventional auxiliary systems was modelled in Aspen Plus, and CO 2 emissions reduction and exergy analysis of the system adaptive for flexible operating conditions was performed. Increasing the scrap ratio by 5{\%} consistently lead to a 4{\%} reduction in CO 2 emissions. Similarly, increasing the CO input rate by 100 kg/THM consistently resulted in a reduction of CO 2 emissions of approximately 3{\%}. The maximum CO 2 emissions reduction of 22{\%} was achieved at the condition of the operably highest scrap ratio and CO input rate.",
keywords = "Carbon recycling process, Rist model, Scrap usage",
author = "Shinnosuke Hisashige and Takao Nakagaki and Takaiku Yamamoto",
year = "2019",
month = "4",
day = "1",
doi = "10.2355/isijinternational.ISIJINT-2018-355",
language = "English",
volume = "59",
pages = "598--606",
journal = "ISIJ International",
issn = "0915-1559",
publisher = "Iron and Steel Institute of Japan",
number = "4",

}

TY - JOUR

T1 - CO 2 emission reduction and exergy analysis of smart steelmaking system adaptive for flexible operating conditions

AU - Hisashige, Shinnosuke

AU - Nakagaki, Takao

AU - Yamamoto, Takaiku

PY - 2019/4/1

Y1 - 2019/4/1

N2 - The iron and steel industry accounts for approximately 45% of the CO 2 emissions in the Japanese industrial sector, and therefore is investing in improvements to reduce the CO 2 emissions. Current projections are for the stock of scrap iron and steel products to increase in the future. Being already in the reduced state, such scrap can be regenerated to steel with lower CO 2 emissions than iron ore. The “Packed bed type Partial Smelting Reduction process” (PSR), which concurrently smelts scrap and reduces iron ore, is a promising method to utilize scrap iron. This work evaluates the feasibility of combining PSR with top gas recycling, a process commonly called the ‘SMART steelmaking system’. In the SMART system, CO 2 derived from the PSR gas is reduced into CO or CH 4 and recycled to the furnace as a reducing agent. The integrated whole process including shaft furnace, CO 2 electrolysis, pressure swing adsorption, and other conventional auxiliary systems was modelled in Aspen Plus, and CO 2 emissions reduction and exergy analysis of the system adaptive for flexible operating conditions was performed. Increasing the scrap ratio by 5% consistently lead to a 4% reduction in CO 2 emissions. Similarly, increasing the CO input rate by 100 kg/THM consistently resulted in a reduction of CO 2 emissions of approximately 3%. The maximum CO 2 emissions reduction of 22% was achieved at the condition of the operably highest scrap ratio and CO input rate.

AB - The iron and steel industry accounts for approximately 45% of the CO 2 emissions in the Japanese industrial sector, and therefore is investing in improvements to reduce the CO 2 emissions. Current projections are for the stock of scrap iron and steel products to increase in the future. Being already in the reduced state, such scrap can be regenerated to steel with lower CO 2 emissions than iron ore. The “Packed bed type Partial Smelting Reduction process” (PSR), which concurrently smelts scrap and reduces iron ore, is a promising method to utilize scrap iron. This work evaluates the feasibility of combining PSR with top gas recycling, a process commonly called the ‘SMART steelmaking system’. In the SMART system, CO 2 derived from the PSR gas is reduced into CO or CH 4 and recycled to the furnace as a reducing agent. The integrated whole process including shaft furnace, CO 2 electrolysis, pressure swing adsorption, and other conventional auxiliary systems was modelled in Aspen Plus, and CO 2 emissions reduction and exergy analysis of the system adaptive for flexible operating conditions was performed. Increasing the scrap ratio by 5% consistently lead to a 4% reduction in CO 2 emissions. Similarly, increasing the CO input rate by 100 kg/THM consistently resulted in a reduction of CO 2 emissions of approximately 3%. The maximum CO 2 emissions reduction of 22% was achieved at the condition of the operably highest scrap ratio and CO input rate.

KW - Carbon recycling process

KW - Rist model

KW - Scrap usage

UR - http://www.scopus.com/inward/record.url?scp=85065775495&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85065775495&partnerID=8YFLogxK

U2 - 10.2355/isijinternational.ISIJINT-2018-355

DO - 10.2355/isijinternational.ISIJINT-2018-355

M3 - Article

VL - 59

SP - 598

EP - 606

JO - ISIJ International

JF - ISIJ International

SN - 0915-1559

IS - 4

ER -