Analysis on optimization and influencing factors of exergy loss in ironmaking system of steel enterprise
CHEN Baoqi1,2, NA Hongming1,2, YUAN Yuxing1,2, WANG Weichen1,2, DU Tao1,2
1. SEP Key Laboratory of Eco-Industry, Northeastern University, Shenyang 110819, Liaoning, China; 2. National Frontiers Science Center for Industrial Intelligence and Systems Optimization, Northeastern University, Shenyang 110819, Liaoning, China
Abstract：The steel industry is a typical high-energy consuming industry. China is the world′s largest steel producer, with crude steel production consistently ranking first in the world. China′s steel production is mainly based on the BF-BOF production process, among which the energy consumption of the ironmaking system accounts for a huge proportion. Reducing energy loss in the ironmaking system and improving energy utilization efficiency are of great significance for the further development of energy conservation and emission reduction in China′s steel industry. The exergy analysis method reveals the transfer, loss, utilization, and degradation of exergy in energy from the perspectives of "quantity" and "quality", facilitating the exploration of energy-saving potential and promoting the energy-saving and consumption reduction work of the system. Based on the theory of energy balance, material balance and exergy balance, combined with actual equipment production modes and technical parameters, an optimization model for the ironmaking system is established, which includes four processes, coking, sintering, pelletizing and blast furnace process. The goal is to minimize the exergy loss of the ironmaking system, and then analyze the main factors that affect the reduction of exergy loss in the ironmaking system and their action patterns. The results show that,the total exergy loss of ironmaking system decreased from 5 474.89 MJ/t to 4 775.84 MJ/t, with a decrease of 12.77%. The blast furnace process contributed 45.91% of the exergy loss in ironmaking system,the direct exergy saving caused by the reduction of process exergy loss is 202.98 MJ/t. And the indirect exergy saving caused by the change of iron ratio is 496.08 MJ/t; Reducing the moisture and ash content of coking coal, reducing the self return rate and the air leakage rate of sintering machine are helpful to reduce the system exergy loss. The improvement of sinter grade, blast temperature and oxygen enrichment rate of blast furnace blast, coal injection rate of blast furnace, lump ore ratio and pellet ratio in burden structure are helpful to reduce system exergy loss.
陈宝奇, 那洪明, 袁喻兴, 王维辰, 杜涛. 钢铁企业炼铁系统㶲损优化及影响因素分析[J]. 钢铁, 2023, 58(11): 141-149.
CHEN Baoqi, NA Hongming, YUAN Yuxing, WANG Weichen, DU Tao. Analysis on optimization and influencing factors of exergy loss in ironmaking system of steel enterprise[J]. Iron and Steel, 2023, 58(11): 141-149.
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