蓄热式轧钢加热炉热工特性及节能降耗研究

发布时间：2018-05-05 18:42

  本文选题：蓄热式加热炉 + 强化辐射换热　； 参考：《西安建筑科技大学》2017年硕士论文

【摘要】：轧钢加热炉是钢铁生产过程中的重要设备之一,也是轧钢工序的主要耗能设备,提高加热炉热效率、降低单位产品能耗、减少污染物排放,对钢铁企业的节能降耗、可持续发展具有积极作用。近年来,蓄热式加热炉经过不断的发展进步,各项性能指标优良,与传统加热炉相比,排烟温度低、炉子热效高,并且可使用单一高炉煤气进行燃烧,烟气中NOx含量低,炉温均匀稳定、加热质量好,所以蓄热式轧钢加热炉得到了钢铁企业的广泛应用。因此,研究蓄热式轧钢加热炉的热工特性,挖掘其节能潜力、提高其能源利用效率,对钢铁企业实现节能降耗具有重要实际意义。本论文在分析了蓄热式加热炉炉内的综合换热过程的基础上,根据辐射传热的相关理论,研究了黑体强化炉内辐射换热技术的节能原理;借助ANSYS软件包中的ICEM-CFD和Fluent软件,建立了蓄热式加热炉黑体强化炉内热交换的三维几何模型,选用k-?湍流模型、涡耗散模型、P-1模型以及快速型、热力型NOx生成模型,分别进行了黑体强化加热炉与无黑体强化加热炉炉膛温度场的数值模拟;通过分析黑体强化炉内辐射换热过程、温度场分布状况及强化效果,在实际加热炉内设计并安装黑体元件,强化炉内辐射传热;通过对蓄热式加热炉热平衡测算,分析了炉内黑体元件的安装对其热工性能及相关能耗指标的影响。结果表明:蓄热式加热炉炉内炉墙、炉顶壁面安装黑体元件,具有强化炉内辐射换热的能力,不仅节能降耗而且能够延长炉衬寿命、提高钢坯加热质量;黑体元件不仅增大了炉体内表面积及黑度,壁面辐射换热率提高,炉内换热强度增大,而且使炉温分布更加均匀稳定,炉膛温度略有升高且在中部保持稳定,有利于减少钢坯的温差和加热缺陷;加热炉安装黑体元件与未安装相比,炉体外表面温度降低了2~5℃,炉体散热减少11.43%;加热炉钢坯的燃料消耗量降低8.3%,热效率提高6.3%,产量提高11.4%,实现约8.2%的节能率。
[Abstract]:The reheating furnace is one of the important equipments in the process of steel production, and it is also the main energy consuming equipment in the rolling process. It can improve the heat efficiency of the heating furnace, reduce the energy consumption per unit product, reduce the pollutant emission, and save energy and reduce the consumption of the iron and steel enterprises. Sustainable development plays a positive role. In recent years, the regenerative reheating furnace has been developed continuously, and the performance indexes are excellent. Compared with the traditional heating furnace, the temperature of exhaust gas is lower, the heat efficiency of the furnace is high, and the single blast furnace gas can be used for combustion, and the content of NOx in the flue gas is low. The furnace temperature is uniform and stable, and the heating quality is good, so the regenerative reheating furnace is widely used in iron and steel enterprises. Therefore, it is of great practical significance for iron and steel enterprises to study the thermal characteristics of regenerative steel rolling reheating furnace, tap its energy saving potential and improve its energy utilization efficiency. On the basis of analyzing the comprehensive heat transfer process in regenerative furnace, according to the theory of radiation heat transfer, the energy saving principle of blackbody enhanced radiation heat transfer technology in furnace is studied, and the ICEM-CFD and Fluent software in ANSYS software are used. In this paper, a three-dimensional geometric model of blackbody enhanced heat exchange in regenerative furnace is established. Turbulent model, vortex dissipation model and fast and thermodynamic NOx generation model are used to simulate the temperature field of blackbody enhanced furnace and blackbody enhanced furnace respectively, and the radiation heat transfer process in blackbody enhanced furnace is analyzed. Distribution of temperature field and strengthening effect, blackbody element is designed and installed in actual heating furnace, radiation heat transfer in furnace is enhanced, heat balance of regenerative furnace is measured, The influence of installation of blackbody elements on thermal performance and related energy consumption index is analyzed. The results show that the blackbody elements are installed on the wall of the furnace and the top wall of the regenerative furnace, which can enhance the radiation and heat transfer in the furnace, not only save energy and reduce the consumption, but also prolong the service life of the furnace lining and improve the heating quality of the billet. The blackbody element not only increases the surface area and blackness of the furnace, but also increases the heat transfer rate of the wall surface radiation and the heat transfer intensity in the furnace, and makes the temperature distribution of the furnace more uniform and stable, and the furnace temperature increases slightly and keeps stable in the middle of the furnace. It is advantageous to reduce the temperature difference and heating defect of the billet, and the temperature of the outer surface of the furnace body is reduced by 2 ~ 5 鈩，

本文编号：1848858