Abstract

Oxygen is one of the most important energies used in converter steelmaking processes of integrated iron and steel works. Precisely forecasting oxygen consumption before processing can benefit process control and energy optimization. This paper assumes there is a linear relationship between the oxygen consumption and input materials, and random noises are caused by other unmeasurable materials and unobserved reactions. Then, a novel hybrid prediction model integrating multiple linear regression (MLR) and Gaussian process regression (GPR) is introduced. In the hybrid model, the MLR method is developed to figure the global trend of the oxygen consumption, and the GPR method is applied to explore the local fluctuation caused by noise. Additionally, to accelerate the computational speed on the practical data set, a K-means clustering method is devised to respectively train a number of GPR models. The proposed hybrid model is validated with the actual data collected from an integrated iron and steel work in China, and compared with benchmark prediction models including MLR, artificial neural network, support vector machine and standard GPR. The forecasting results indicate that the suggested model is able to not only produce satisfactory point forecasts, but also estimate accurate probabilistic intervals.

Highlights

  • In modern integrated iron and steel works, oxygen is one of the most important energy resources used in various production processes, such as oxygen-rich combustion for ironmaking, converter blowing for steelmaking, and flame cutting for casting [1]

  • To precisely monitor for oxygen consumption improves the process controlling performance in the steelmaking process, and benefits making a satisfactory schedule for oxygen production to achieve the goal of energy saving and economic profits [3]

  • This task is usually realized by static prediction models which obviously differ with dynamic prediction models

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Summary

Introduction

In modern integrated iron and steel works, oxygen is one of the most important energy resources used in various production processes, such as oxygen-rich combustion for ironmaking, converter blowing for steelmaking, and flame cutting for casting [1]. About 20% [2] plant-wide electric power is used to produce the oxygen, and more than 50% [2] oxygen is used in the steelmaking process. To precisely monitor for oxygen consumption improves the process controlling performance in the steelmaking process, and benefits making a satisfactory schedule for oxygen production to achieve the goal of energy saving and economic profits [3]. The main task of the steelmaking process is to produce various grades of steel by removing impurities in hot metal, such as excess carbon, silicon, manganese and phosphorus [4]. Converter steelmaking is a complex process including melting, purifying, and alloying which are carried out at approximately

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