基于钢锭生产过程换热模型的工艺节能优化

Energy saving optimization based on heat exchange model of ingot production process

为了改善钢锭加热工艺,减少钢锭生产过程中能源消耗,研究上海宝山钢铁集团的蓄热式均热炉和钢锭系统热过程工艺,建立了生产全流程数值仿真模型,包括模内冷却模型、模外冷却模型、保温模型以及炉内加热过程模型。首先,将模型采用交替隐式差分格式进行离散,运用追赶法(TDMA)进行求解;其次,采用温度跟踪法对钢锭系统热过程各模型进行实测验证;第三,以所建立的数学模型为基础,对钢锭生产过程进行了计算,并根据实际生产为背景对现有的加热工艺进行节能优化。研究结果表明:使用该模型对钢坯加热生产过程进行模拟计算温度时,模内冷却过程、模外冷却过程和保温过程最大相对误差分别为2.1%,2.6%和2.9%,相对误差在合理范围内,证明了数学模型的正确可靠,能够满足工程的实际需要。在使用该模型的优化方案后,生产过程中110号和210号加热法的平均节能率为10.3%和6.3%,节能效果明显。

In order to improve the heating process of ingot and reduce the energy consumption in the process of ingot production,regenerative soaking furnace and thermal process technology of ingot system in Shanghai Baoshan Iron and Steel Group were studied in detail.On the basis of this process,a numerical simulation model of the whole production process was established,including in-mold cooling model,out-of-mold cooling model,heat preservation model and in-furnace heating process model.Firstly,the model was discretized by alternating implicit difference scheme and solved by catch-up method(TDMA).Secondly,the thermal process models of ingot system were verified by temperature tracking method.Thirdly,based on the established mathematical model,the ingot production process was simulated,and the existing heating process was optimized for energy saving according to the actual production.The results show that when the model is used to simulate the billet heating production process,the maximum relative errors of temperature of in-mold cooling process,out-mold cooling process and heat-keeping process are 2.1%,2.6%and 2.9%,respectively.The relative errors are within a reasonable range,which proves that the mathematical model is correct and reliable,and can meet the practical needs of the project.After using the optimized scheme of the model,the average energy saving rate of heating method No.110 and No.210 in the production process is 10.3%and 6.3%,respectively,and the energy saving effect is obvious.