Modeling And Optimization Of Byproduct Gas-Steam-Power System In Iron And Steel Works

The energy system of iron and steel works is mainly composed of gas,steam and power system.Studies have shown that a reasonable production decision-making program is a powerful guarantee for efficient and orderly operation of gas-steam-power system in iron and steel works.However,the current research is seldom used in production practice,as well as lack of comprehensive and practical research methods.For this reason,this paper takes the gas,steam and power into account when establishing the gas-steam-power system optimization model for the iron and steel works.And a multi-objective optimization model considering environmental costs and economic operations is established to solve pollutants emission.This article aims at obtaining reasonable decision-making plan to realize the efficient and orderly operation of the gas-steam-power system in iron and steel works.This paper summarizes the research theory and method of energy system optimization,puts forward the main logical as well as solution procedures,and abstracts the general modeling framework of gas-steam-power system in iron and steel enterprises.The established single objective of economic optimization model is applied to case enterprises,which shown the relative error is in the range from 0 to 10%for each equipment as adopting the input-output cost model.Comparing the total economic operating cost before and after optimization,it shows the total economic operating cost after optimization is reduced by 18,189 yuan,as well as the fuel and load distribution plan and grid trading scheme among units are given.Meanwhile,the fluctuation of coal price and gas surplus are analyzed,which demonstrates the utilization rate of blast furnace gas improves gradually with the increase of coal price.The result shows that the utilization rate of blast furnace gas continues to increase with the increase of coal price,but the consumption of steam coal and the output from power generation decrease continuously.And the output of power generation firstly increases and then gradually stabilizes as the increase of gas surplus.Contraposing to the production structure and energy pricing mechanism of gassteam-power system in the case enterprise,B4 boiler maintenance and waste heat recovery cost as two scenarios are set up,and the utilization of energy is analyzed.Finally,a multi-objective optimization model of the gas-steam-power system in iron and steel works is formed,meanwhile comparing and analyzing the operation of the system with and without the consideration of environmental cost.The results displays that pollutant discharge should be emphasized when modeling the gas-steam-power system in iron and steel works,and the multi-objective optimization algorithm can get a reasonable production plan compared with the single objective optimization model.In view of the current three kinds of pollution discharge standards,the results illustrates that it is essential to give priority to the ES2 when making the production plan for the gas-steam-power system in iron and steel works.