Injection of Solid Biomass Products into the Blast Furnace and its Potential Effects on an Integrated Steel Plant

Wang, Chuan; Larsson, Mikael; Lövgren, Jonas; Nilsson, Larsgunnar; Mellin, Pelle; Yang, Weihong; Salman, Hassan; Hultgren, Anders

doi:10.1016/j.egypro.2014.12.105

Cited by 42 publications

(14 citation statements)

References 4 publications

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“…Intensive work is being done to mitigate the CO 2 emissions in steel industry by partial substitution of fossil fuels (coal and coke) with renewable source of energy such as biomass. [7][8][9][10][11][12][13][14][15] One of biomass materials which could be used as binder for briquettes and reducing agent in blast furnace is lignin. Lignin is considered as the second most abundant renewable biomass on the earth after cellulose and it represents about 30% of the total raw biomass.…”

Section: Introductionmentioning

confidence: 99%

Novel Approach Towards Biomass Lignin Utilization in Ironmaking Blast Furnace

2017

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Growing concerns over fossil CO 2 emissions has created a considerable interest in an efficient utilization of renewable biomass in steel industry. Biomass lignin can be used as binder and reducing agent in the blast furnace briquettes. The traditional briquettes consist of various iron oxide-containing residues and cement is used as binder to give the proper mechanical strength. In the present study, cement (C) has been partially and totally substituted with lignin (L) to produce briquettes containing 0-12 wt.% lignin (L/C: 0, 10, 25, 50 and 100%). The mechanical strength has been evaluated based on drop test and tumbler index measurement. The partial replacement of cement with lignin up to 25% (3.0 wt.% lignin in briquettes) was exhibited adequate briquettes strength for blast furnace application. At higher substitution rate (L/C: 50 and 100%), the briquettes strength was sharply decreased. The briquettes with proper mechanical strength (L/C: 0, 10 and 25%) were subjected to self-reduction under inert atmosphere using thermogravimetric technique (TGA). The reduction rate of briquettes increased when increasing the cement substitution with lignin. The reduction took place in two main steps at 500-800°C and 800-940°C. Combined effect of gas diffusion and interfacial reaction were the rate determining step at the first stage while carbon gasification was controlling the second step of reduction. Interrupted reduction tests have been conducted to evaluate the compression strength after reduction. For all briquettes, the increased reduction temperature and lignin content deteriorated the briquette's mechanical strength due to the effect of dehydration and lignin gasification.

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Section: Introductionmentioning

confidence: 99%

Novel Approach Towards Biomass Lignin Utilization in Ironmaking Blast Furnace

2017

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“…The former can replace 22.8% while the later can replace only 20% of the injected pulverized coal. Further increase in the injection rate of bio-based materials requires further oxygen enrichment and it might lead to decreased RAFT temperature and increased the top gas temperature [108,109].…”

Section: Biomass Injectionmentioning

confidence: 99%

New Trends in the Application of Carbon-Bearing Materials in Blast Furnace Iron-Making

Ahmed

2018

Minerals

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The iron and steel industry is still dependent on fossil coking coal. About 70% of the total steel production relies directly on fossil coal and coke inputs. Therefore, steel production contributes by ~7% of the global CO2 emission. The reduction of CO2 emission has been given highest priority by the iron- and steel-making sector due to the commitment of governments to mitigate CO2 emission according to Kyoto protocol. Utilization of auxiliary carbonaceous materials in the blast furnace and other iron-making technologies is one of the most efficient options to reduce the coke consumption and, consequently, the CO2 emission. The present review gives an insight of the trends in the applications of auxiliary carbon-bearing material in iron-making processes. Partial substitution of top charged coke by nut coke, lump charcoal, or carbon composite agglomerates were found to not only decrease the dependency on virgin fossil carbon, but also improve the blast furnace performance and increase the productivity. Partial or complete substitution of pulverized coal by waste plastics or renewable carbon-bearing materials like waste plastics or biomass help in mitigating the CO2 emission due to its high H2 content compared to fossil carbon. Injecting such reactive materials results in improved combustion and reduced coke consumption. Moreover, utilization of integrated steel plant fines and gases becomes necessary to achieve profitability to steel mill operation from both economic and environmental aspects. Recycling of such results in recovering the valuable components and thereby decrease the energy consumption and the need of landfills at the steel plants as well as reduce the consumption of virgin materials and reduce CO2 emission. On the other hand, developed technologies for iron-making rather than blast furnace opens a window and provide a good opportunity to utilize auxiliary carbon-bearing materials that are difficult to utilize in conventional blast furnace iron-making.

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“…A traditional BF strongly relies on coke, and the coke rate is responsible for a large part of the production cost. Most of the new trends in blast furnace technology have focused on developing a coke alternative, such as natural gas injection, pulverized coal, waste plastic, biomass, coke oven gas and other hydrocarbon injections [3][4][5][6][7][8][9][10]. However, the practical applicability of these materials strongly depends on the natural resource distribution [11].…”

Section: Introductionmentioning

confidence: 99%

Energy Conservation and CO2 Abatement Potential of a Gas-injection Blast Furnace

Qie

Lyu

Lan

et al. 2020

High Temperature Materials and Processes

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AbstractThe gas-injection blast furnace (BF) is a new iron-making technology with an injecting gas instead of traditional pulverized coal injection (PCI) and recycling of the BF top gas through a gasifier. In contrast to traditional all-coke and PCI BFs, the coke rate will depend mostly on the heat consumption in a gas-injection BF with abundant injected gas, which results in a large coke-saving potential. Based on energy conservation, carbon recycling, CO2 abatement and fuel cost, the degree of direct reduction should be between 0.2 and 0.3. In addition, in terms of the effects of the gas injected and the rich oxygen rate in the tuyere region, the optimum injection parameters were obtained, which can reduce the coke rate to 273.36 kg/tHM, carbon recycling to 100.72 kg/tHM and abate carbon dioxide emissions by 94.00 Nm3/tHM. Theoretically, the minimum total carbon consumption value is 399.73 kg/tHM. These results illustrate the great potential for carbon recycling and coke saving in gas-injection BFs without increasing total carbon consumption.

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Injection of Solid Biomass Products into the Blast Furnace and its Potential Effects on an Integrated Steel Plant

Cited by 42 publications

References 4 publications

Novel Approach Towards Biomass Lignin Utilization in Ironmaking Blast Furnace

Novel Approach Towards Biomass Lignin Utilization in Ironmaking Blast Furnace

New Trends in the Application of Carbon-Bearing Materials in Blast Furnace Iron-Making

Energy Conservation and CO2 Abatement Potential of a Gas-injection Blast Furnace

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