Numerical Simulation Of Paper Industrial Plants Under High Temperature And Humidity Environment

In recent years, with the development of modern paper industry, the volume of Paper Industrial plant is becoming bigger and bigger. The plant also generates a lot of heat and moisture in the paper production process, so Paper Industrial plants ventilation and wall condensation problems are becoming prominent questions to solve. With the development of the computer technology and numeric computing technology, it is possible to apply Computational Fluid Dynamics (CFD) to designs and analysis of airflow organization in HVAC engineering. This article is about the analysis of airflow organization and maintenance structure of Yueyang Paper Industry plant through the method of numerical simulation.In the simulation process, according to the situation that the wet sources and the heat sources are scattered, the paper modeled the wet sources and the heat sources appropriate simplification, sought to close to the maximum extent practical. Boundary conditions of Paper Industrial plant related to the success or failure of simulation. In this article, Papermaking workshop will be divided into three parts according to Paper Process of Yueyang Paper Industrial plant which to be known as wet end, drying department and completing department. The Heat and the moisture of the three parts were calculated respectively,We found that the heat and moisture dispersion of the papermaking workshop mainly concentrated in the wet end and drying department.The paper first gives introduction about the CFD basic theory and common commercial CFD software. Yueyang Paper Industry plant is simulated, with FLUENT software. According to the characteristics of papermaking workshop, a standard k-εmodel is used together with the algebraic equation of eddy viscosity directly in the near-wall region. The difference scheme is power law scheme. Boussinesq approximation and SIMPLE algorithm is adopted while control equations are solved on non-uniform staggered grid. In this way, simulation results of winter were obtained, such as temperature, relative humidity and water content, with the comparison of difference cases, the best case was chosen. The paper also found the dew point of the maintenance structure based on Fitting formula of water content. From the results of simulation, we found the temperature of the dew point in wet end is the highest of the maintenance structure, so it is positive for preventing wall condensation to strengthen air distribution and insulation measures here.