主吸收塔整体热处理升温阶段研究及工艺优化

Research and process optimization of overall heat treatment heating stage of main absorption tower

为明确主吸收塔整体热处理时塔体温度分布情况,优化热处理工艺技术,改善热影响区组织以消除其残余应力,文中利用非稳态计算模型对其升温全阶段进行数值模拟。将充分燃烧后火焰外焰面形状作为入口边界,通过多物理场耦合模拟,研究其内部流场和温度场的分布特征及壁面温度分布情况。随后改变火焰入口参数,研究不同火焰参数对主吸收塔壁面温度分布的影响规律,并制定适宜的立式主吸收塔升温阶段的工艺参数,对常温至600℃的升温全过程进行研究,得出升温12 h 56 min后壁面平均温度达到606.62℃,壁面最高温度630.57℃,最低温度560.20℃,温差70.37℃,满足热处理规程要求。

In order to clarify the temperature distribution of the main absorption tower during the overall heat treatment,optimize the heat treatment technology and improve the structure of the heat-affected zone to eliminate its residual stress,the unsteady calculation model was used to simulate the whole heating stage of the main absorption tower.Taking the shape of the flame surface as the inlet boundary,the distribution characteristics of the internal flow field and temperature field and the temperature distribution of the wall surface were studied by multi-physical coupling simulation.Then,the flame inlet parameters were changed to study the effect of different flame parameters on the temperature distribution of the main absorption tower wall,the appropriate process parameters for the heating stage of the vertical main absorption tower were formulated,and heating process were studied at room temperature to 600℃.It is concluded that after heating up for 12 hours and 56 minutes,the average wall temperature reaches 606.62℃,the highest wall temperature is 630.57℃,the lowest temperature is 560.20℃,and the temperature difference is 70.37℃,which meets the requirements of heat treatment regulations.