竖罐式和环冷式烧结矿冷却过程的数值模拟

Numerical simulation of sinter cooling processes in vertical tank and annular cooler

针对烧结矿冷却的两种基本模式——环冷式和竖罐式,分别建立了环冷机、竖罐内对流换热过程的非稳态模型,并运用场协同理论进行了分析比较.结果表明:在相同的冷却效果下,竖罐式冷却过程传热的场协同数明显大于环冷式,因此可以大大加强热烧结矿高温显热的回收.同时研究了气料比、料层总高度、料层半径等因素对于竖罐式烧结矿冷却过程场协同数的影响,从节约能耗的角度,指出了在兼顾冷却传热性能、实际生产需求的条件下,应当选择相对较小的气料比,且冷却竖罐应由'瘦高型'向'矮胖型'发展.

Based on the two basic sinter cooling models either in annular cooler or in vertical tank, relative two-dimensional unsteady models of convective heat transfer process are established respectively. Analyses and comparison are made by using the field synergy theory. The result shows that in the condition of same cooling effect, the field synergy number of sinter cooling process in the vertical tank is obviously larger the that in the annular cooler. Therefore, the former is better on the performance of the heat recovery of sinter. What is more, the effects of the ratio of gas to sinter, the total height of bed layer and the radius of bed layer to the field synergy number on sinter cooling process in vertical tank are investigated. For energy saving, the optimal selective operating parameters are proposed by consideration of both the actual production demand and heat transfer of cooling process.