炉缸冷却壁对流换热系数计算及烘炉传热特性

doi:DOI：10.13228/j.boyuan.issn0449-749x.20180342

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Abstract The cooling performance of the hearth cooling stave is mainly reflected by the convective heat transfer between the cooling water and the pipe. For the empirical formula of the convective heat transfer coefficient commonly used in engineering calculations cannot satisfy different flow conditions， which will result in a large analysis error of the thermal stress of the hearth. Therefore， a blast furnace （BF） hearth structure is taken as an example in this article， and the expressions of comprehensive convective heat transfer coefficients of the cooling water in different flow states are deduced firstly utilizing the heat transfer criterion number equation. At the same time， the applicable range of the empirical formula for the convective heat transfer coefficient is discussed. Then， the expression of the comprehensive convective heat transfer coefficient of the cooling water in a laminar flow state while considering the attenuation of the thermal resistance is deduced by the iterative calculation method. Based on these conditions， the thermomechanical basis of the micro-water furnace heating and even the closed-water furnace heating is obtained through the transient heat transfer and cooling analysis of the hearth side stave heat transfer model under furnace heating conditions， which can be used to assess and perfect the initial formulation of the BF furnace heating system.

Key words： cooling stave convective heat transfer coefficient criterion number equation furnace heating transient heat transfer analysis

Received: 28 August 2018 Published: 09 May 2019

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	Articles by authors
	MA Xiao-gang
	CHEN Liang-yu
	LI Yang

Cite this article:

MA Xiao-gang,CHEN Liang-yu,LI Yang. Calculation of convective heat transfer coefficient of hearth cooling stave and furnace heating transfer characteristics[J]. Iron and Steel, 2019, 54(5): 19-26.

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http://www.chinamet.cn/Jweb_gt/EN/DOI：10.13228/j.boyuan.issn0449-749x.20180342 OR http://www.chinamet.cn/Jweb_gt/EN/Y2019/V54/I5/19

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