高炉炉底密封板上翘机理及预防措施

doi:10.13228/j.boyuan.issn0449-749x.20130660

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Abstract The phenomena of the upturned bottom sealing plate were found from several blast furnaces (BFs) field surveys. The bottom sealing plates of some Blast Furnaces were even upturned 100-140 mm height, which led to bottom transformed into pot shape, the gas leaked from bottom and the bottom cooling effects weakened. It’s harmful for the longevity and efficient productivity of BF. The temperature field and thermal stress field mathematical model of hearth bottom was established and the effects of abnormal expansion, normal thermal expansion of lining bricks, thickness of bottom sealing plate, expansion joint and refractory cushion mortar on upturned height of bottom sealing plate were analyzed. Because of the abnormal expansion of lining bricks, big upward pressure at the tuyere combined bricks can be generated and the bottom sealing plate would be upturned finally. However, the normal thermal expansion of lining bricks could not result in the large upturned height of bottom sealing plate. The accumulation and enrichment of harmful elements such as alkalis, zinc and plumbum might lead to abnormal expansion of bricks and the upturning of bottom sealing plate. It can mitigate the transformation of bottom sealing plate with increasing thickness of bottom sealing plate. The appropriate expansion joint and good refractory cushion mortar can absorb the thermal expansion, but it can’t solve the large abnormal expansion. In order to restrain and reduce the phenomena of upturned bottom sealing plate, the enough expansion gap should be needed at the tuyere combined bricks and the front of tuyere-cooler casing should not be deep into the lining bricks. And also the charging amount of harmful elements should be controlled strictly and the discharging ability of harmful elements needs to be improved.

Key words： blast furnace hearth bottom bottom sealing plate upturned abnormal expansion

Received: 25 November 2013 Published: 02 December 2014

PACS:

TF573.1

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	Articles by authors
	LI Xiang-Long
	CHENG Su-Sen
	YU Ying-Sheng

Cite this article:

LI Xiang-Long,CHENG Su-Sen,YU Ying-Sheng. Mechanism and Preventive Measures of Upturned Blast Furnace Bottom Sealing Plate[J]. Iron and Steel, 2014, 49(12): 18-23.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20130660 OR http://www.chinamet.cn/Jweb_gt/EN/Y2014/V49/I12/18

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