喷雾干燥的计算机模拟

对喷雾干燥的计算机模拟计算进行了初步探讨,用FORTRAN语言编制了程序,对喷雾干燥过程进行了总体衡算和微元衡算,使计算快速、准确,而且便于程序与数据管理,结果表明,计算机完全可以替代人工手算.     

喷雾干燥法烟气脱硫过程的数学模拟

影响喷雾干燥法烟气脱硫过程的因素很多，如液滴初始粒径、液滴初始速度、烟气入口温度、烟气入口速度和SO2入口浓度等。在分析喷雾干燥塔内气液两相流动及单个粒子与气相之间传热传质过程的基础上，建立了喷雾干燥法烟气脱硫过程的数学模型，模拟分析并讨论了上述各因素对脱硫效率的影响，并通过实验对模型进行了验证。     

喷雾干燥的数学模型和技术进展

介绍了国外在计算机模型基础上发展起来的喷雾干燥技术的最新进展,由于数字模型回答了喷雾干燥过程中的许多问题,新的喷雾干燥设备（它们更多的是喷雾干燥塔,流化床一体化装置）可以提供较好的品质控制,耗能少,细粉少而效率更高。     

过热高浓度磷酸一铵溶液逆流喷雾干燥数学模型

研究了影响粉状磷酸一铵喷雾干燥的各种主要因素;建立了喷雾干燥塔工程放大的数学模型,为研究气流式喷雾干燥或实际应用提供了技术基础。     

喷雾干燥的研究进展

介绍了国内外喷雾干燥领域的最新研究进展,阐述了喷雾冷冻干燥、超临界喷雾干燥等方面的研究结果,探讨了关于喷雾干燥过程数学模拟的研究方法和结论,总结、归纳并提出了目前国内外较新的关于喷雾干燥的研究课题和方向。     

过热高浓度磷酸—铵溶液逆流喷雾干燥数学模型

研究了影响粉状磷酸－铵喷雾干燥的各种主要因素;建立了喷雾干燥塔工程放大的数学模型,为研究气流式喷雾干燥或实际应用提供了技术基础。     

苏打粉喷雾干燥工艺的模拟与优化

以年产4万t苏打粉为例,应用Aspen plus软件,模拟NaHCO₃浆料与空气在喷雾干燥塔中通过并流向下的方式传质传热,得到符合要求的苏打粉。运用灵敏度分析确定泵的压力、空气温度和进料量分别对产品温度、湿度、平均直径和能耗的影响。再加入复合模糊控制算法,通过仿真实验验证该控制算法适合在苏打粉喷雾干燥控制过程中推广。     

喷雾干燥塔模糊控制模型及仿真

本文在研究喷雾干燥塔的传统控制的基础上,提出利用模糊控制方法并建立了模糊控制模型,仿真结果表明利用模糊控制方法进行喷雾干燥塔的控制是可行的。     

不同喷雾干燥方式对粉末橡胶结构与性能的影响

采用热空气喷雾干燥和过热蒸汽喷雾干燥制备粉末橡胶,并研究其干燥胶粉的形态结构及性能。FT-IR表明,热空气喷雾干燥比过热蒸汽喷雾干燥更容易引入含氧基团,造成粉末橡胶氧化分解。SEM表明过热蒸汽喷雾干燥使物料干燥程度更高,有利于水分蒸发。GPC表明热空气喷雾干燥容易破坏橡胶分子链,降低橡胶分子量,过热蒸汽喷雾干燥更能保持橡胶原有分子链。     

喷雾干燥塔的节能方法

本文简要介绍了喷雾干燥塔的使用特点,并探讨了其节能方法。     

实验室用压力式喷雾干燥器的研究

实验室用压力式喷雾干燥器是目前建筑陶瓷行业所急需的.笔者主要介绍了研究本课题的意义及创新之处,并阐述了本课题的研究内容及关键技术.     

Soda Ash Production from Trona in a Spray Dryer

Production of soda ash from Trona solution was achieved in a spray dryer reactor. Fractional conversion of NaHCO₃ reached to values close to unity in this unit within a residence time of less than a second. Results indicated that above 140°C, heat transfer limitations played a significant role on the calcination process taking place in the spray dryer. Equilibrium limitations may become important only at very low temperatures and at high CO₂ and H₂O partial pressures. Results obtained in the spray dryer and from the thermal gravimetric analysis of Trona crystals agreed well. It was also shown that the predictions of the unreacted core model are in good agreement with the kinetic data. © 1997 SCI.     

A Three-Dimensional Numerical Study of the Gas/Particle Interactions in an Industrial-Scale Spray Dryer for Milk Powder Production

Gas/particle interaction plays an important role in modern spray dryers and may have influences on wall deposition, agglomeration, powder degradation, etc. In the present study, the three-dimensional (3-D) transient multiphase flow in an industrial-scale spray dryer has been investigated using the CFD package FLUENT. The Eulerian–Lagrangian approach and two-way coupling method were used in the simulations. The reaction engineering approach (REA model) for milk particles has been implemented. Some new characteristics of the gas flow pattern and the particle behavior (e.g., temperature–time profiles) were identified from the numerical results; for example, the milk particles flow in such a way that makes the central jet oscillation more nonlinear. The discrete phase enhances the turbulence near the air/droplet inlet but damps it downstream. The transient turbulent flow causes significant uncertainties in the particle tracking, which presented some challenges in simulations. The study has highlighted the importance in performing 3-D transient simulations in order to understand the industrial-scale dryers.     

Numerical Study of the Drying Process of Different Sized Particles in an Industrial-Scale Spray Dryer

Development of high-performance spray dryers that are more energy efficient and are able to produce high-quality milk powders is very important for the future of the dairy powder industry. Understanding and optimization of the exiting dryers are also of great value. Computational fluid dynamics is a powerful tool to simulate and help understanding the characteristics of spray drying and to introduce potentially improved designs. The present study has concentrated on the multiphase flow in an industrial-scale spray dryer using the CFD package FLUENT. A Eulerian-Lagrangian approach is used in the simulations. A new drying model, REA model, for milk particles has been implemented for the first time in a CFD application. The numerical results match well with the plant data. It is argued that the “reflecting wall” boundary condition produced more physically correct results for normal dryer operation than the “escaping wall” boundary condition. The second one is an oversimplification. The influences of the particle size and particle size distribution, residence time, kinetic energy, and maximum temperature have been analyzed. The initial droplet size range was set to be from 100 to 500 µm with Rosin-Rammler distribution function. One significant result of this study is that rather dense particle clouds of medium-size particles (224–285 µm) are found near the side walls. They are transported upwards along the side wall (conical wall surface) and then are dispersed. It is found the particles with initial diameters of between 225 and 270 µm have the largest residence times.     

Modeling of Dust Explosion in the Industrial Spray Dryer

Standard ANSYS FLUENT software was used to model a dust explosion inside a counter current spray-drying tower by replacing the dust with a flammable gas–air mixture. Two sets of computational fluid dynamics (CFD) calculations for a dust explosion in the tower were carried out at a uniform gas concentration and variable concentration in the dryer, which reflect the distribution of wet and dry powder zones in the spray dryer. The CFD calculation showed that a dust explosion developed from the ignition point mostly to the upper part of the tower. The temperature, velocity, and reaction profiles followed the same upward pattern. Results of the calculations allowed us to determine the position and parameters of venting devices that should be installed to minimize the risk of damage to the dryer construction.     

引进离心喷雾干燥器油润滑系统的失效报警原因与故障排除

对引进的离心喷雾干燥器油润滑系统失效报警的原因进行了分析 ,提出了相应的故障排除方法。     

微型喷雾干燥机

介绍一种专为实验室开发研制的微型喷雾干燥机的工作原理、结构型式、性能参数等。该机型具有体积小、能耗低、操作控制简单、易于移动拆洗等特点。     

300Mw机组容量脱硫喷淋塔内部流场模拟研究

采用Fluent软件对300 Mw机组容量的脱硫喷淋塔的内部流场进行了数值模拟,使用Gambit软件对该模型采用非结构化四面体网格进行网格划分。研究了烟气的不同的入口形式,不同的入口角度对流场的影响。结果表明:120°和180°双入口烟道,入口角度为15°斜向下时,具有较好的流场分布。