Understanding of Blast Furnace Performance with Biomass Introduction

被引:14
|
作者
Orre, Joel [1 ]
Okvist, Lena Sundqvist [1 ,2 ]
Boden, Axel [3 ]
Bjorkman, Bo [2 ]
机构
[1] Swerim, Dept Met, S-97437 Lulea, Sweden
[2] Lulea Univ Technol, Dept Civil Environm & Nat Resources Engn, Minerals & Met Engn, MiMeR, S-97187 Lulea, Sweden
[3] Relitor, S-97334 Lulea, Sweden
关键词
bio-coal; blast furnace; heat and mass balance; Rist diagram; CDRR diagram; REDUCING AGENT RATE; GAS INJECTION; REDUCTION; OPERATION; COMPOSITE; MODEL;
D O I
10.3390/min11020157
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The blast furnace still dominates the production and supply of metallic units for steelmaking. Coke and coal used in the blast furnace contribute substantially to CO2 emissions from the steel sector. Therefore, blast furnace operators are making great efforts to lower the fossil CO2 emissions and transition to fossil-free steelmaking. In previous studies the use of pre-treated biomass has been indicated to have great potential to significantly lower fossil CO2 emissions. Even negative CO2 emission can be achieved if biomass is used together with carbon capture and storage. Blast furnace conditions will change at substantial inputs of biomass but can be defined through model calculations when using a model calibrated with actual operational data to define the key blast furnace performance parameters. To understand the effect, the modelling results for different biomass cases are evaluated in detail and the overall performance is visualised in Rist- and carbon direct reduction rate (CDRR) diagrams. In this study injection of torrefied biomass or charcoal, top charging of charcoal as well as the use of a combination of both methods are evaluated in model calculations. It was found that significant impact on the blast furnace conditions by the injection of 142 kg/tHM of torrefied biomass could be counteracted by also top-charging 30 kg/tHM of charcoal. With combined use of the latter methods, CO2-emissions can be potentially reduced by up to 34% with moderate change in blast furnace conditions and limited investments.
引用
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页码:1 / 14
页数:14
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