铸坯热送热装工艺对加热炉能效的影响

Effect of hot delivery and hot charging process of slab on the energy efficiency of reheating furnace

为了探究热送热装工艺的节能优势,本文以某钢厂热送热装生产线为研究对象,通过测量铸坯温度、收集连铸坯生产参数,建立了铸坯在炉加热模型,利用有限元法计算了铸坯的温度云图分布和热量变化情况,比较了不同热履历铸坯在炉加热过程中的异同。同时,测量了不同装炉温度下的加热炉炉况,结合加热炉各段温度、空煤气流量、烟气流量等生产参数与铸坯吸热量的数值模拟计算结果,分析了不同装炉温度下加热炉的热平衡和燃耗。研究表明:相较于冷装,现有热装加热工艺可减少燃耗约11.81 kgce/t;通过调节生产节奏,解决了现有热送热装工艺存在的铸坯在炉时间过长的问题,优化后的工艺较冷装吨钢生产可节省燃耗约19.62 kgce/t。

In order to explore the energy-saving advantages of hot delivery and hot charging process,taking the hot delivery and hot charging production line of a steel plant as the research object,the numerical physical model of slab reheating in furnace was established by measuring the slab temperature and collecting the production data of continuous casting slab.The temperature nephogram and heat variation of the slab were obtained by using the finite element method,and the similarities and differences of the slabs with different heat histories in the reheating process were compared.Meanwhile,the furnace conditions were measured under different charging temperatures.Based on the production data of furnace temperature profile,air flow,fuel gas flow,and flue gas flow,as well as the numerical simulation results of slab heat absorption,the heat balance and fuel consumption of the furnace with different charging temperatures were calculated.Results show that compared with cold charging,the existing hot charging and heating process could reduce the fuel consumption by about 11.81 kgce/t.By adjusting the production pace,the problem of the existing hot delivery and hot charging process that the slab is in the furnace for too long has been solved.The optimized process reduced the fuel consumption by about 19.62 kgce/t compared with cold charging process.