生物质能在炼铁领域应用的研究现状及展望

doi:10.13228/j.boyuan.issn0449-749x.20220329

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Abstract Under the national carbon emission peak and neutrality targes,the ironmaking industry should develop alternative energy to reduce the consumption of primary fossil fuels along with the improvement of production technology,which is one of the key ways to achieve low-carbon development. As a clean and renewable energy,biomass energy has the characteristics of wide sources,environment-friendly and carbon neutral. Natural biomass energy has high volatile content and is easy to burn,while the physical and chemical properties of biochar after pyrolysis are close to those of coal. The application of biomass energy as fuel and reducing agent in ironmaking can effectively play its role in energy conservation and emission reduction. Based on the analysis of the physical and chemical properties of biomass energy,the research status of the application of biomass energy in coke preparation,blast furnace injection,sintering and pelletizing are mainly introduced. It is pointed out that the co-pyrolysis technology of biomass and pulverized coal is the key to coking with biomass blended coal. In order to promote the application of biomass coke in blast furnace smelting,it is necessary to explore the influence of biomass coke on the permeability of blast furnace soft melt zone. Then,it is pointed out that the main factors effecting pulverized coal injection with biomass energy include calorific value,combustion characteristic temperature and combustion rate of biomass. A new technology of coal gasification with biomass and breeze is put forward,which can broaden the selection range of biomass energy for blast furnace injection,and produce high-quality hydrogen rich reduction gas for blast furnace injection. Furthermore,the quality of sinter can be guaranteed and significant emission reduction effect can be achieved by adjusting the proportion of biomass and sintering process parameters. Pellets with high metallization rate and suitable bond index can be obtained through strictly controlling the kind of biomass and its content. At the same time,the effect of biomass addition content on the quality of sinter and pellets should be researched further. Finally, most of the above studies are in the basic research stages. Therefore,it is suggested that the production practice of biomass energy in blast furnace ironmaking,sintering,pelletizing should be accelerated in order to deeply evaluate the application potential of biomass energy in low-carbon ironmaking fields.

Key words： biomass energy sinter blast furnace injection biomass pellet emission reduction

Received: 09 May 2022

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