富氧燃烧条件对加热炉传热特性影响

doi:10.13228/j.boyuan.issn0449-749x.20230368

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Abstract Oxygen-enriched combustion has the advantages of increasing theoretical combustion temperature,reducing excess air coefficient and enhancing flue gas radiation capacity,so it has become a hot research topic in the field of industrial furnace. However,the influence of oxygen-enriched combustion position and the volume percent of oxygen on the flow and heat transfer process in steel rolling furnace is still unclear. In this paper,the flow models,oxygen-enriched combustion model and heat transfer model in the heating furnace are established and applied in the case reheating furnace. After the accuracy of the model is verified by the test data,the variation rules of temperature field,velocity field and billet heat transfer process in the furnace are analyzed when the oxygen-enriched combustion is located in the preheating stage,the first heating stage and the second heating stage respectively. Then the best position of oxygen-enriched combustion is obtained. Secondly,the variation law of flue gas heat loss,furnace thermal efficiency and energy saving rate is analyzed when the volume percent of oxygen changes from 21% to 49% in the fixed oxygen-enriched combustion position. Then the optimal range of the volume percent of oxygen is obtained. The results show that when the volume percent of oxygen is fixed,oxygen-enriched combustion is carried out in the preheating stage,the first heating stage and the second heating stage,the most obvious heat flux changes occur in the furnace positions of 17-25,17-34 and 29-44 m,respectively. The average heat flux increases at these locations were 4.95,7.42,and 7.95 kW/m²,respectively. When the oxygen rich combustion positions are fixed in the pre heating section,heating section 1,or heating section 2,and the volume percent of oxygen varies between 21% and 37%,for each 1% increase in the volume percent of oxygen,the flue gas loss decreases by 0.25%,0.55%,and 0.72%,the furnace thermal efficiency increases by 0.13%,0.3% and 0.39%,and the energy saving rate increases by 0.2%,0.99% and 1.09%,respectively. However,when the volume percent of oxygen is in the range of 37%-49%,the changes of flue gas loss,furnace thermal efficiency and energy saving rate are not obvious even if the oxygen-enriched combustion is implemented in the second heating stage. It can be seen that in the steel rolling reheating furnace,the high heat load stage implements oxygen rich combustion and the volume percent of oxygen is in the range of 21%-37% is the energy-saving effect most obvious.

Key words： reheating furnace oxygen-enriched combustion oxygen volume percent furnace thermal efficiency energy saving rate

Received: 30 June 2023

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	CHEN Demin
	LI Ning
	LIU Xiao
	ZHAO Yibo
	LI Xiuping
	CHEN Guang

Cite this article:

CHEN Demin,LI Ning,LIU Xiao等. Effect of oxygen-enriched combustion conditions on heat transfer characteristics of reheating furnace[J]. Iron and Steel, 2024, 59(2): 173-184.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230368 OR http://www.chinamet.cn/Jweb_gt/EN/Y2024/V59/I2/173

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