A Flow-chart for Iron Making on the Basis of 100% Usage of Process Oxygen and Hot Reducing Gases Injection.

Tseitlin, M. A.; Lazutkin, S. E.; Styopin, Gennady Michail

doi:10.2355/isijinternational.34.570

Cited by 56 publications

(45 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The methods are defined as follows. (1) Simple blast replacement: The normal blast gas volume is decreased, and sufficient volume of top gas is recycled in order to maintain tuyere gas volume, (2) Oxygenenriched blast replacement: The normal blast gas volume is decreased and sufficient volume of recycled top gas andadditional enriching oxygen is added in order to maintain both tuyere gas total volume and tuyere gas oxygen volume. (3) Hot reducing gas (HRG) replacement: As per oxygen enriched blast replacement, except C02 is removedfrom recycled top gas.…”

Section: Methodsof Top Gasrecyclingmentioning

confidence: 99%

See 1 more Smart Citation

Prediction of Blast Furnace Performance with Top Gas Recycling.

1998

View full text Add to dashboard Cite

Section: Methodsof Top Gasrecyclingmentioning

confidence: 99%

“…Top gas recycling was experimentally tested on a small furnace and was found to significantly decrease fuel rate while increasing productivity. 1) This paper uses a previously presented mathematical model of the blast furnace2,3) to estimate blast furnace performance under various top gas recycling strategies.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Blast Furnace Performance with Top Gas Recycling.

1998

View full text Add to dashboard Cite

“…2) In order to suppress the emission rates, the use of non-fossil reductants, e.g., biomass, [3][4][5] BF top gas recycling 2,[6][7][8][9] and CO 2 capture and storage 10) have been proposed as potential solutions. Even though top gas recycling in the blast furnace is an old idea, and has been practiced already in the 1980'es in several campaigns at Toulachermet in Russia, 11) the awakened interest in the technique is due to the potential of suppressing the coke rate and dramatically reduce emissions if the stripped CO 2 can be stored.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Top Gas Recycling Conditions under High Oxygen Enrichment in the Blast Furnace

Helle

Saxén

et al. 2010

ISIJ Int.

View full text Add to dashboard Cite

Primary steelmaking is among the most energy intensive industrial processes in the world and being mainly coal-based it substantially contributes to the global fossil CO 2 emissions. It is therefore important to study potential ways of suppressing the use of fossil reductants and the rate of emissions in the process. This paper analyzes by simulation and optimization the concept of recycling CO 2 -stripped top gas in the blast furnace under massive oxygen enrichment, and its impact on the production economy and emissions of the steel plant. The effect of CO 2 emissions and stripping/storage costs on the optimal states is presented. The system studied is demonstrated to exhibit complex transitions between the optimal states. The findings throw light on the importance of selecting a proper state of operation for achieving a cost-efficient production of steel with reduced environmental impact.KEY WORDS: blast furnace; top gas recycling; economic optimization; CO 2 emissions. 931© 2010 ISIJ concept with tuyere injection of the CO 2 -stripped and heated top gas together with oxygen-enriched blast is evaluated by simulation. The performance of the process is optimized with respect to oxygen injection, top gas recycling rate and temperature, and oil injection rate using a linearized model of the blast furnace. However, since top gas recycling dramatically affects the material and energy flows in the whole plant, 14) the entire system should be studied in order to evaluate the overall benefits. The present study therefore comprises the coke plant, sinter plant, hot stoves, blast furnace, stripping unit, the basic oxygen furnace and power plant, paying attention to the costs and the emissions of the process, and the optimal states of operation of the system are studied with different price settings for CO 2 emissions and stripping/storage. The SystemWe study the units in an integrated steel works from the raw material processing units through one blast furnace to the basic oxygen furnace (BOF), 5) with liquid steel as the main product (Fig. 1). The models were developed on the basis of process data from a Finnish integrated steel works. The core of the analysis is the blast furnace with oil injection and top gas recycling, which is modeled in more detail. In the next subsection, the models are briefly described. For more details, the reader is referred to Refs. 15, 16). Process Models and CO 2 EmissionsThe main focus of the study is put on the blast furnace, for which a more detailed description is used while the other unit processes are described in a simplified way (see Appendix). The sinter plant is modelled by expressing the produced sinter, the required coke and limestone as well as the recovered heat as linear functions of the ore inflow. The coke plant is described by linear relations between the mass flow rate of feed coal and the mass flow rate of coke and volume flow rate of (purified) coke oven gas (COG). The (internal) flow rate of coke, available for the blast furnace, is given by the difference of the coke ...

show abstract

“…17,18) The prediction by both numerical simulation and trial BF operation indicated that the shaft injection of hot reducing gas, in which CO 2 was stripped from the recycled gas, led to an increase in production and simultaneously a decrease in fuel rate. [19][20][21][22][23] As a whole, top gas recycling technology combining shaft injection was proved to make positive contribution to cutting down CO 2 emission from BF. On the other hand, although the utilizations of COREX © 2011 ISIJ tric power generation, chemical products and BF shaft injection, [24][25][26][27][28][29][30] as a typical nitrogen-free process, it is much more applicable to capture and remove CO2 and H2O in the top gas and to recycle it for re-injection.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Pre-reduction Shaft Furnace with Top Gas Recycling Technology Aiming to Cut Down CO2 Emission

Yagi

et al. 2011

ISIJ Int.

View full text Add to dashboard Cite

Top gas recycling is considered as one of the highest potential technologies to improve reduction efficiency and correspondingly to reduce carbon consumption. As a typical nitrogen free ironmaking process, pre-reduction shaft furnace of COREX ® process (COREX ® shaft furnace) for short is suitable to adopt the technology aiming to cut down CO2 emission. Under the premise of constant total injection volume, three kinds of reducing gas injection methods are numerically studied by employing a two-dimensional mathematical model. The method that 20% of total reducing gas in volume fraction is blasted through normal inlet (NI) while the rest through down pipe inlet (PI) rather than deadman inlet (DI) could apparently improve gas flow in the inactive zone located near the bottom direct reduced iron (DRI) outlet, thus increasing DRI reduction degree to 61% under present calculation conditions. Meanwhile, either decreasing the vertical height of PI or increasing its diameter makes further improvement on furnace efficiency. After adopting top gas recycling to the shaft furnace by NI+PI method with optimal parameters, CO utilization ratio reaches above 46% when DRI reduction degree correspondingly increases by 12%, what's more, CO2 emission from the whole process is reduced by about 540 Nm 3 /tHM. The results prove that top gas recycling technology promotes reduction efficiency inside shaft furnace and greatly reduces the greenhouse gas emission, which will contribute to suppressing global warming.

show abstract

A Flow-chart for Iron Making on the Basis of 100% Usage of Process Oxygen and Hot Reducing Gases Injection.

Cited by 56 publications

References 0 publications

Prediction of Blast Furnace Performance with Top Gas Recycling.

Prediction of Blast Furnace Performance with Top Gas Recycling.

Optimization of Top Gas Recycling Conditions under High Oxygen Enrichment in the Blast Furnace

Prediction of Pre-reduction Shaft Furnace with Top Gas Recycling Technology Aiming to Cut Down CO2 Emission

Contact Info

Product

Resources

About