顶煤气循环氧气高炉工艺是一种新型高炉炼铁工艺,具有大幅降低燃料比、减少CO2排放和提高铁水生产效率等优点。对于氧气高炉的内部生产状态、整体生产指标、能量利用以及经济效益等进行了深入的系统性研究。通过顶煤气循环氧气高炉多流体模型,对风口喷吹循环煤气与风口炉身同时喷吹循环煤气2种路线下不同操作参数对氧气高炉的冶炼状态、生产指标、氧气高炉的能量利用效率以及经济效益的影响进行了研究对比。结果表明,随着理论燃烧温度的增加,氧气高炉焦比上升,产量进一步增大,高炉的热力学完善度和㶲效率降低,氧气高炉的综合效益增加。在只有风口喷吹循环煤气的条件下,与理论燃烧温度2 000 ℃的案例相比,理论燃烧温度为2 184 ℃时,焦比上升至243.9 kg/t,产量增加至5 538.3 t/d,热力学完善度由90.69%降低至88.30%,经济效益由13 540 万元/a上升至16 252 万元/a。与风口喷吹循环煤气的路线相比,风口和炉身同时喷吹循环煤气的顶煤气循环氧气高炉具有更大的产量、节焦量、热力学完善度、㶲效率以及更高的综合经济效益。在理论燃烧温度为2 184 ℃,炉腹煤气流量为3 881 m3/min时,风口炉身同时喷吹的顶煤气循环氧气高炉的产量提高51.46%,焦比降低43.82%,CO2减排32.52%,热力学完善度为92.19%,㶲效率为86.51%,综合效益为25 621万元/a。
Abstract
Top gas recycling oxygen blast furnace process is a new process of blast furnace ironmaking process, which has the advantages of greatly reducing fuel ratio, reducing CO2 emission and improving the production efficiency of iron. The internal production state, production indexes, energy utilization and economic benefit of top gas recycling oxygen blast furnace are studied systematically. Calculated by the multi-fluid model of the top gas recycling oxygen blast furnace, the influence of different operating parameters on the smelting state, production index, energy utilization efficiency and economic benefit of the oxygen blast furnace with the recycling gas tuyere being injected from furnace tuyere and the recycling gas tuyere being injected fromtuyere and the furnace shaft are studied and compared. The results showed that with the increase of theoretical combustion temperature, the coke ratio of top gas recycling oxygen blast furnace rose, the production increased further, the thermodynamic perfection degree of blast furnace and the exergic efficiency decreased, while the comprehensive benefit of oxygen blast furnace increased. With the recycling gas only injected from tuyere, under the case of theoretical combustion temperature of 2 184 ℃, the coke ratio rose to 243.9 kg/t, the yield increased to 5 538.3 t/d, and the thermodynamic perfection degree decreased from 90.69% to 88.30% compared with case of theoretical combustion temperature of 2 000 ℃. The economic benefit increased from 135.4 million yuan/a to 162.52 million yuan/a. Compared with the tuyere injection of recycling gas, the top gas recycling oxygen blast furnace with recycling gas injection both in the tuyere and shaft has greaterproduction, higher coke saving, thermodynamic perfection, exergic efficiency degree and higher comprehensive economic benefit. Under the condition of theoretical combustion temperature of 2 184 ℃ and gas flow rate of furnace belly of 3 881 m3/min, exergy efficiency of exergy and exergy was 86.51%, while exergy output of exergy and exergy were increased by 51.46%, coke ratio decreased by 43.82%, CO2 emission decreased by 32.52%, thermodynamic completeness of 92.19%, exergy efficiency of 86.51%. The comprehensive benefit is 256.21 million yuan/a.
关键词
顶煤气循环 /
氧气高炉 /
数值模拟 /
能量利用效率 /
经济效益 /
碳排放
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Key words
top gas recycling /
oxygen blast furnace /
numerical simulation /
energy utilization efficiency /
economic benefit /
carbon emission
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脚注
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基金
国家自然科学基金资助项目(51904063); 中央高校基本科研业务费资助项目(N2225046); 中国宝武低碳冶金创新基金资助项目(BWLCF202102); 河北省重点研发计划资助项目(21314001D); 第七批“万人计划”资助项目(ZX20220553)
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