Numerical Simulation Study of Co-injection of Pulverized Coal and Hydrogen in the Tuyere-Raceway

IF 2.5 3区材料科学 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY

Journal of Sustainable Metallurgy Pub Date : 2024-06-03 DOI:10.1007/s40831-024-00840-3

Zhenhua Wang, Junhong Zhang, Chenghao Xie, Lihua Gao, Zhijun He, Wenlong Zhan

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Abstract

Hydrogen can replace partially pulverized coal in the blast furnace injection as the clean and high-calorific energy, which can reduce energy consumption and carbon emission in molten iron production. In this study, a discrete phase model is used to describe the complex flow and thermochemical behavior associated with the co-injection of hydrogen and pulverized coal in the raceway. The effect of hydrogen injection rate on the raceway is studied from the aspects of gas velocity, temperature, concentration distribution and coal burnout rate. It can be concluded that with the hydrogen injection rate increases, the gas velocity slightly increases and the gas temperature decreases significantly at the deeper location of the coke bed. With the hydrogen injection rate increase every 10 m³·t⁻¹, the theoretical combustion temperature decreases about 14 K and the amount of gas in the bosh increases about 46.91 m³. When the hydrogen injection rate increased to 50 m³·t⁻¹, the coke ratio is reduced by 8.66%, and the concentration of CO and hydrogen along the axis of tuyere increases by 0.5% and 7.79%, respectively. However, when the hydrogen injection rate exceeds 30 m³·t⁻¹, the pulverized coal burnout rate decreases.

Graphical Abstract

Abstract Image

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Tuyere-Raceway 煤粉和氢气共注数值模拟研究

氢气作为清洁的高热值能源，可替代高炉喷吹中的部分煤粉，从而降低铁水生产的能耗和碳排放。本研究采用离散相模型来描述与滚道中氢气和煤粉共喷相关的复杂流动和热化学行为。从气体速度、温度、浓度分布和煤粉燃尽率等方面研究了氢气注入率对滚道的影响。结果表明，随着氢气喷射速率的增加，焦炭层较深位置的煤气速度略有增加，煤气温度明显下降。注氢率每增加 10 m3-t-1，理论燃烧温度降低约 14 K，焦炭床中的煤气量增加约 46.91 m3。当注氢率增加到 50 m3-t-1 时，焦比降低了 8.66%，CO 和氢气沿塔轴线的浓度分别增加了 0.5%和 7.79%。但当注氢量超过 30 m3-t-1 时，煤粉燃尽率下降。

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来源期刊

Journal of Sustainable Metallurgy Materials Science-Metals and Alloys

CiteScore

4.00

自引率

12.50%

发文量

151

期刊介绍： Journal of Sustainable Metallurgy is dedicated to presenting metallurgical processes and related research aimed at improving the sustainability of metal-producing industries, with a particular emphasis on materials recovery, reuse, and recycling. Its editorial scope encompasses new techniques, as well as optimization of existing processes, including utilization, treatment, and management of metallurgically generated residues. Articles on non-technical barriers and drivers that can affect sustainability will also be considered.