Instantaneous measurements of granular blast furnace slag thermal parameters

ZHANG Yanguo; ZHANG Ying; YANG Xiaoxiao

doi:10.16511/j.cnki.qhdxxb.2019.22.048

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Journal of Tsinghua University(Science and Technology) ›› 2020, Vol. 60 ›› Issue (3) : 248-253. DOI: 10.16511/j.cnki.qhdxxb.2019.22.048

NUCLEAR ENERGY AND NEW ENERGY

Instantaneous measurements of granular blast furnace slag thermal parameters

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Abstract

An instantaneous measurement method was developed to measure the surface temperature and surface emissivity of blast furnace slag for investigating dry granulation and waste heat recovery from blast furnace slag. The system was used to measure temperature-gray scale and emissivity-temperature relationships from granular blast furnace slag images captured by a high-speed camera based on the surface gray scale level. The surface temperature and the surface emissivity of the granular blast furnace slag could then be obtained by combining the measured surface gray scale with these relationships for the granular blast furnace slag. The results show that the surface emissivity decreases with decreasing slag surface temperature. The slag surface emissivity is about 0.89 at 1 402℃.

Key words

surface temperature / blast furnace slag / dry granulation / waste heat recovery / surface emissivity

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ZHANG Yanguo, ZHANG Ying, YANG Xiaoxiao. Instantaneous measurements of granular blast furnace slag thermal parameters[J]. Journal of Tsinghua University(Science and Technology). 2020, 60(3): 248-253 https://doi.org/10.16511/j.cnki.qhdxxb.2019.22.048

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