基于机理的流化床干燥器数值模拟研究  

Numerical Simulation of Fluidized Bed Dryer Based on Mechanism

作　　者：丁一[1] 汪洁 张婷暄 刘昱明 孙怀宇[1] DING Yi;WANG Jie;ZHANG Tingxuan;LIU Yuming;SUN Huaiyu(Shenyang University of Chemical Technology,Shenyang Liaoning 110142,China;China Petroleum Materials Zhengzhou Co.,Ltd.,Henan Zhengzhou 450003,China)

机构地区：[1]沈阳化工大学,辽宁沈阳110142 [2]中国石油物资郑州有限公司,郑州河南450003

出　　处：《辽宁化工》2024年第11期1782-1785,1789,共5页Liaoning Chemical Industry

摘　　要：流化床干燥是很多生产流程中重要的单元操作,此过程同时涉及流体流动、传热、传质和相变等过程,整体上比较复杂。连续操作的干燥过程具有大惯性和非线性的特点,不易对过程进行准确的设计和控制。为了更好地了解流化床干燥器内的参数分布和动态特性,从机理模拟的角度进行了研究。采用将设备空间分为多个单元块的拟二维方式,对干燥过程进行模拟。在单元块内建立了物料衡算、热量衡算及传热传质过程的微分模型,由于干燥过程是非稳定过程,选用四阶龙格库塔法对单元块内的微分方程进行数值计算。在单元块之间建立了固体及气体的流动模型。使用C#开发了单元块模拟平台软件,并在其上实现了单元块内的计算程序及单元格之间流动的计算。应用此方法,对流化床干燥器进行了模拟计算。软件能够得到干燥器内的温度及湿度分布等,并能对干燥器进行一定的动态模拟。Fluidized bed drying is an important unit operation in many production processes.This process involves fluid flow,heat transfer,mass transfer,phase change and other processes,which is complex on the whole.The continuous drying process has the characteristics of high inertia and nonlinearity,making it difficult to accurately design and control the process.In order to better understand the parameter distribution and dynamic characteristics inside the fluidized bed dryer,the research was conducted from the perspective of mechanism simulation.The drying process was simulated by dividing the equipment space into multiple unit blocks in a quasi two-dimensional manner.A differential model for material balance,heat balance,and heat&mass transfer processes was established within the unit block.Due to the unstable nature of the drying process,the fourth order Runge Kutta method was used to numerically calculate the differential equations within the unit block.A solid and gas flow model was established between the unit blocks.A unit block simulation platform software was developed by C#,and the calculation program within the unit block and the calculation of flow between cells were implemented on it.This method was applied to simulate the fluidized bed dryer.The software can get the temperature and humidity distribution in the dryer,and it can carry out certain dynamic simulation of the dryer.

关 键 词：流化床干燥器 动态模拟 软件开发 微分方程 单元块法 

分 类 号：TQ015.9[化学工程]