顶燃式热风炉周期性工作的数值模拟

Numerical study on periodic work of a top combustion hot blast stove

提高高炉热风炉热风温度对于降低能耗、实现经济绿色发展具有重要意义。以某2 500 m^(3)高炉热风炉为原型,建立了顶燃式热风炉的三维数学模型。采用Fluent软件对热风炉在"两烧一送"工况下烧炉和送风的过程进行多次连续性仿真模拟。选用可实现的k-ε湍流模型、P-1辐射模型和涡流耗散模型分别应用于模拟流体的流动、辐射传热以及化学燃烧。在此基础上,进一步分析了混烧不同比例的焦炉煤气对热风炉内部温度场和热风温度的影响。模拟结果表明,在这两个工作过程中,热风炉蓄热室内部温度相差200℃,这是冷风在蓄热室中所吸收的热量;混烧1%和2%焦炉煤气均可以提高热风平均温度20℃。

Improving the hot blast temperature of the hot blast stove is of great significance for reducing energy and realizing economic green development. Taking a 2 500 m^(3) blast furnace hot blast stove as a prototype, a three-dimensional mathematical model of top combustion hot blast stove was established. Fluent software was used to carry out several continuous simulations of hot blast stove combustion and air supply under the operation of "two stoves blasting, one stove supplying air". The realizable k-ε turbulence model, P-1 radiation model and eddy dissipation model were applied to simulate fluid flow, radiation heat transfer and chemical combustion, respectively. And on this basis, the influence of coke oven gas in different proportions on the temperature field and the hot blast temperature in the hot blast stove was further analyzed. The simulation results show that the temperature difference in the regenerator of the hot blast stove is 200 ℃ during these two working cycles, which is the heat absorbed by cold air in regenerator. Also, under this working condition, coke oven gas can increase the hot blast temperature by 20 ℃ when the mixing proportion is 1% and 2%, respectively.