烧结矿粒度组成对竖冷炉运行影响的DEM模拟

doi:10.13228/j.boyuan.issn0449-749x.20210594

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Abstract In order to improve the voidage distribution in the vertical cooling furnace and promote the heat transfer between hot sinter and cooling gas, three working conditions with gradually decreasing particle size distribution range were designed from the perspective of reducing the upper limit of sinter feeding particle size. Based on the quasi three-dimensional slot model of a single furnace cavity in the vertical cooling furnace of MeiSteel, the variation laws of sinter velocity distribution, voidage distribution and pressure drop distribution in the furnace were studied by discrete element method. The results showed that, with the feeding particle size composition of 10-150 mm, a rectangular low-speed zone was formed above the central hood, which reduced the uniformity of downward moving speed of sinter. The low voidage area gradually expanded and formed the distribution of low voidage in the middle area and high voidage in the edge and center area of the furnace cavity. The voidage segregation was the most serious and the distribution uniformity was the worst in the furnace. 40% of area in the furnace was the high pressure drop area, which was mainly distributed in the middle area. 20% of area was the low pressure drop area, which was mainly distributed in the central area, and resulting in the most serious gas flow segregation in the furnace. By reducing the upper limit of feeding particle size, the rectangular low-speed zone was eliminated and the integrity of sinter flow was improved. When the feeding particle size composition of 10-90 mm was adopted, the minimum voidage was increased, and the difference of voidage between the middle area and the side wall as well as the central area was reduced, so that the segregation degree of voidage was the minimum and the uniformity was the highest. At the same time, the composition reduced the maximum value and increased the minimum value of pressure drop, and expanded the range of medium pressure drop zone, so as to alleviate the gas flow segregation distribution in the furnace and improve its distribution uniformity. Reducing the upper limit of sinter feeding particle size by adding secondary crushing process can become a practical direction to improve the operation of sinter vertical cooling furnace. In the future, the most suitable sinter feeding particle size range and the mass percent of each particle size section should be studied.

Key words： sinter vertical cooling furnace velocity distribution voidage pressure drop

Received: 28 September 2020

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	QI Teng-fei
	HUANG Jun
	SUN Jun-jie
	ZHANG Yong-jie

Cite this article:

QI Teng-fei,HUANG Jun,SUN Jun-jie等. DEM simulation for effect of sinter particle size composition on operation of vertical cooling furnace[J]. Iron and Steel, 2022, 57(5): 40-47.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210594 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I5/40

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