Temperature Measurement Method for Blast Furnace Molten Iron Based on Infrared Thermography and Temperature Reduction Model.

Dong Pan,Zhipeng Chen,Weihua Gui,Yongfang Xie,Chunhua Yang,Zhaohui Jiang

doi:10.3390/s18113792

Abstract

The temperature measurement of blast furnace (BF) molten iron is a mandatory requirement in the ironmaking process, and the molten iron temperature is significant in estimating the molten iron quality and control blast furnace condition. However, it is not easy to realize real-time measurement of molten iron temperature because of the harsh environment in the blast furnace casthouse and the high-temperature characteristics of molten iron. To achieve continuous detection of the molten iron temperature of the blast furnace, this paper proposes a temperature measurement method based on infrared thermography and a temperature reduction model. Firstly, an infrared thermal imager is applied to capture the infrared thermal image of the molten iron flow after the skimmer. Then, based on the temperature distribution of the molten iron flow region, a temperature mapping model is established to measure the molten iron temperature after the skimmer. Finally, a temperature reduction model is developed to describe the relationship between the molten iron temperature at the taphole and skimmer, and the molten iron temperature at the taphole is calculated according to the temperature reduction model and the molten iron temperature after the skimmer. Industrial experiment results illustrate that the proposed method can achieve simultaneous measurement of molten iron temperature at the skimmer and taphole and provide reliable temperature data for regulating the blast furnace.

Highlights

Blast furnace (BF) ironmaking, which refers to the continuous production of molten iron in blast furnace (BF) using coke, iron ore and flux, is one of the key processes in the iron and steel industry, and the molten iron temperature (MIT) produced by BF is a main parameter that reflects the BF condition, the molten iron quality, and the energy consumption status [1,2,3]
Considering that the taphole is connected to the blast furnace hearth, the MIT at taphole can be seen as the MIT in the hearth of the BF
Order to avoid the influence of after environmental disturbances on infrared casthouse, theinenvironmental disturbances the skimmer are much less than those measurement results, these infrared thermal images of molten iron flow are captured by an infrared at the taphole

Summary

Introduction

Blast furnace (BF) ironmaking, which refers to the continuous production of molten iron in BFs using coke, iron ore and flux, is one of the key processes in the iron and steel industry, and the molten iron temperature (MIT) produced by BF is a main parameter that reflects the BF condition, the molten iron quality, and the energy consumption status [1,2,3]. A real-time measurement method of MIT would be of great use for maintaining a stable operation of a BF and regulating the molten iron quality [4,5]. A BF can be considered as a closed high-temperature large vertical reactor, as a result, there is no method to directly detect the MIT in the BF hearth. Given the high-temperature and harsh environment during the tapping process, direct detection of the MIT

Methods

Results

Discussion

Conclusion