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鋼鐵企業能耗瓶頸診斷數學模型及應用

Mathematical model for diagnosis of energy consumption bottlenecks in steel plants and its application

  • 摘要: 針對鋼鐵廠物質流和能量流對能耗同時產生影響的問題,建立了能耗瓶頸診斷模型.模型分別用鋼比系數和工序能耗衡量物質流和能量流,其功能是將噸鋼綜合能耗的變化分解為鋼比系數的變化和工序能耗的變化,從而將兩種因素的影響相分離,尋找能耗瓶頸.模型分析通過三步進行,分別針對總流程、區域和工序,形成了系統的分析體系.同時,提出了貢獻指數的概念,以定量地描述各個因素對噸鋼綜合能耗的影響大小.利用該模型對某鋼廠2001年和2007年的能耗指標進行實例分析,找出了相應的能耗瓶頸為煉鐵區域和軋鋼區域鋼比系數的增加與煉鋼區域工序能耗的上升,并提出了增加熱送熱裝比、降低加熱爐燃料消耗等節能對策.

     

    Abstract: In order to solve the problem that material flows and energy flows both have influences on energy consumption in steel plants,a diagnosis model of energy consumption bottlenecks was established.The model uses steel ratio and process energy consumption to measure the material flows and energy flows,respectively.The function of the model is to decompose the change in energy consumption per ton steel into the changes in steel ratio and process energy consumption,so that the two factors effects can be separated, and thus the energy consumption bottlenecks can be found. The model analysis was done through three steps, correspondingly aiming at the main-process stream, the district and the process. Meanwhile, a new concept of contribution index was defined, which can indicate the effects of every factor on the energy consumption per ton steel. The model was applied to analyze the energy consumption indexes of a typical iron and steel enterprise in China using the data of energy consumption in 2001 and 2007, and the energy consumption bottlenecks in the steelmaking process were analyzed. The result shows that the restraining factors of energy consumption are the steel ratio of iron making district and steel rolling district and the process energy consumption of steel making district. At last, energy-saving measures, such as increasing the ratio of hot load and hot transportation and cutting down the fuel consumption of heating furnaces, were proposed.

     

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