Research On Analyzing Method Of Energy Consumption For Pelletizing Of Iron And Steel Mill

Energy is the base on which human society relies for survival and development, having important status in development of national economy. As lack of energy per capita, China has been paying highly attention to energy conservation and energy comprehensive utilization. As energy consumption of iron and steel industry contributes 15% of total national industrial energy consumption, energy conservation and emission reduction of iron and steel industry has been paid much attention to. Energy consumption analysis is the base to carry out the work of energy saving and energy comprehensive utilization, and is the prerequisite to apply measures for energy conservation and consumption reduction, which provides thoughts and basis to explore potential of energy conservation and improve energy efficiency.At present there are many studies of energy consumption analysis about steel making.But most of them are in inclined to professional technology analysis or macro decision support, which are difficult to apply the results to guide actualizing of measures of energy saving. Steel making industry comprises long production processes, of which each work procedure runs relatively independently. In order to increase energy efficiency, work procedure could be taken as the investigation subject. However, the existing study is lack of systematic analysis to work procedure energy consumption, including energy consumption range delimiting, influencing factors analysis and energy consumption modeling.To solve the above problem, this study will choose the energy consumption of shaft furnace pelletizing as research object to develop an analysis method of work procedure energy consumption. In the steel complex, pelletizing provides iron pellet for the blast furnace iron making, the continuity and complexity of energy consumption in the production of pelletizing can stand for characters of work procedures in steel making, and this study can provide analysis of energy consumption of other work procedures with some reference.This article proposes a method to delimit the range of work procedure energy consumption at first, and to choose materials, equipments and energy relating to energy consumption. This can eliminate interference and make the research object more specific. Within energy consumption boundaries, the total consumption is broken down into several sub-accounts, and each sub account is consumed by a equipment. Then the analysis of work procedure energy consumption is converted into analysis of sub-account, the work procedure energy consumption, and the sum of all the sub-accounts. This study chooses stepwise to select the key influencing factors of sub-account, and establishes regression equation between sub-account and key factors. This regression equation is the stepwise model of sub-account, which gathers the key influencing factors of each sub-account into the key influencing factor set of work procedures. Based on the regression equations of sub-accounts, the work procedure energy consumption model is built, which is validated by the verification of sub-account stepwise model. At last, to continue the thought of breaking apart, this study discusses how the stepwise model can be applied to evaluate the work procedure energy consumption, by inverting the evaluation of work procedure to evaluation of sub-accounts.This paper takes one pellet plant of an iron and steel works as an example, to validate the energy consumption analysis method proposed in this study. Within energy consumption boundaries of this pellet plant, stepwise is used to analysis the key factors of gas consumption in shaft furnace and power consumption in cooling blower, and stepwise models are established. The measured data and model output are compared, and the result showed the fitness of the model is above 95%.