钢铁生产的水能关系分析

Analysis of water-energy nexus in iron and steel production

从钢铁生产过程中水资源使用时的能耗角度研究了钢铁联合企业的水能关系,提出了水能强度的概念来评价企业生产过程中水资源利用的节能水平,建立了钢铁企业的水能关系模型。以中国某大型钢铁联合企业为例,计算并分析了该企业的水能关系。该企业总的水能量为55 709kW·h/h,重复用水水能量占整个钢铁企业全部水能量的82%,补水水能量占16%,排水水能量占1%;各工序中热轧工序占比最大,其次是炼铁、炼钢工序,冷轧、烧结和炼焦工序较低。该企业的吨钢水能强度为0.208kW·h/m^3,炼铁工序的水能强度最高,热轧、炼钢工序次之,烧结、冷轧和炼焦工序较低。最后,从钢铁生产过程水资源利用的角度得到节能的方向及措施。

The nexus between water and energy in iron and steel enterprise was studied from the view of energy consumption of water usage in iron and steel production.And then the concept of water energy intensity was put forward to evaluate the energy-saving level of water resources utilization in the production process of enterprises,and the water-energy nexus model of iron and steel enterprise was established.Taking a large iron and steel enterprise in China as an example,the relationship between water and energy was calculated and analyzed.The total water-energy quantity of the enterprise was 55 709 kW·h/h,the energy of the reused water consumption accounted for 82% of the total water energy of the whole steel enterprise,the energy of hydration water accounted for 16%,and the drainage water energy only accounted for 1%.Hot rolling process accounted for the largest proportion of all processes,followed by ironmaking and steelmaking,and cold rolling,sintering and coking processes were the lowest.The water-energy intensity per ton of steel was 0.208 kW·h/m^3,and the water-energy intensity of the iron-making process was the highest,followed by hot rolling and steelmaking,and the sintering,cold rolling and coking processes were the lowest.Finally,the direction and measures for energy saving were obtained from the perspective of water resources utilization in iron and steel production.