Abstract
The effect of the traditional energy saving mode on process engineering is decreasing, so the idea of system energy saving is developing vigorously. This paper summarizes the existing studies on energy saving from three aspects—energy saving technology, energy management, comprehensive evaluation or analysis—and clearly finds that related studies on energy saving have been gradually promoted to promote the development of system energy saving in the whole process engineering process. Among them, the calculation of energy saving brought by energy saving technology is a difficult point in the research. This paper proposes a novel calculation method of energy saving by taking the iron and steel production process (ISPP) as an example. According to the actual data provided by a steel plant in China, the calculation method is validated effectively.
Highlights
The production process refers to the whole integrated system of the manufacturing process, which is composed of different procedures and different equipment under industrial production conditions [1], including manufacturing process engineering
Based on the production process and production situation of a steel plant in China, this paper proposes an energy-saving calculation method to calculate the contribution of energy-saving technology
For the II-S, the direct energy saving per ton of steel from August to October 2019 is 38.335 kgce/tsteel, and the indirect energy saving per ton of steel is 122.062 kgce/tsteel, among which the indirect energy saving per ton of steel brought by energy-saving technology is 10.059 kgce/tsteel. The problem in this part of calculation is that φiron1 cannot be calculated, that is, the direct energy saving per ton of steel brought by energy-saving technology cannot be calculated
Summary
The production process refers to the whole integrated system of the manufacturing process, which is composed of different procedures and different equipment under industrial production conditions [1], including manufacturing process engineering. The iron and steel production process (ISPP) is the most typical type of manufacturing process engineering. It is an open system far from the equilibrium state, where the energy input and output modes are complicated, resulting in the difficulty of energy saving calculation. The total energy consumption in 2020 was 395.1624 million tons of standard coal, and 402.1703 million tons of standard coal in 2019. Comprehensive energy consumption per ton of steel in 2020 was 545.27 kgce/t, 6.51 kgce/t lower than that in 2019. The ratio of iron and steel in 2020 was 0.8429, 0.0072 lower than that in 2019, which is an important reason for the decrease in comprehensive energy consumption per ton of steel and the direction of China’s iron and steel industry optimization
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