高炉喷吹富氢煤造气工艺的㶲分析

doi:10.13228/j.boyuan.issn0449-749x.20220630

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Abstract For the new iron-making process integrated with blast furnace and hydrogen-rich coal gasification,the exergy analysis model is established according to the mass flow obtained from the mass and heat balance model to evaluate its energy utilization. The exergy flows and main exergy indexes such as exergy loss,thermodynamic perfection degree and exergy efficiency of the traditional blast furnace and two kinds of new iron-making process are calculated and analyzed comparatively. Compared with the mass flow of traditional blast furnace,the resource consumption and by-products of new process such as ore,blast,slag and top gas produced significantly reduce. Notably,the coke ratio of case No.1 and case No.2 is reduced by 9.2% and 22.3% respectively. Although the coal ratio increases by 18.6% and 26.1%,the fuel rate decreases by 1.1% and 8.2%. The exergy structure of new process is different from that of traditional blast furnace. Its exergy input includes the exergy of coke in blast furnace and the exergy of coal in gasifier. Besides,the exergy of coke oven gas and industrial oxygen injected in gasifier also be involved. Although the total exergy input of new process is 5.4% and 5.1% higher than that of traditional blast furnace,the available quality of externally supplied top gas is higher,the exergy obtains is more. The total exergy loss of case No.1 and case No.2 is significantly reduced by 16.5% and 21.7% than that of traditional blast furnace,and the thermodynamic perfection degree increases from 82.0% of traditional blast furnace to 85.6% and 86.5%,which indicates the energy utilization quality is improved. Additionally,the exergy efficiency of new process is increased,in particular the exergy efficiency of case No.2 increases by 6.8%. Therefore,the blast furnace integrated with hydrogen-rich coal gasification has higher energy conversion and utilization efficiency,which demonstrated it is a very effective iron-making process.

Key words： integrated system of blast furnace and hydrogen-rich coal gasification exergy analysis model mass flow exergy flow exergy evaluation

Received: 08 October 2022

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