Shanghai Xinzhuang Instrument Co., Ltd. utilizes commercial CFD software to analyze the temperature, velocity, humidity fields, and material flight trajectory within a spray drying tower. This includes monitoring changes in humidity and temperature of the gas medium. To better understand droplet drying characteristics, custom user programs—especially dry models—are often added. Additionally, due to the turbulent nature of the gas flow inside the drying tower, selecting an appropriate turbulence model significantly affects simulation accuracy, especially when using a rotary air inlet configuration, where turbulence effects are more pronounced.
Recent transient simulations of spray drying have shown that the internal flow field changes over time, causing irregular droplet movement. As a result, even with identical droplet settings, different drying outcomes can occur. Although some residual solvents may be acceptable, droplets might still re-enter high-temperature zones during their flight, which requires further investigation and validation.
A new type of small spray dryer has been developed, combining cryogenic dehumidification with a specialized atomization system to continuously produce low-temperature, low-humidity ice powder. Supercritical spray drying is another emerging technology, used to prepare protein liposome powders. Comparisons between supercritical and subcritical drying methods reveal differences in particle size distribution and morphology. Studies on sugar and chicken protein drying using supercritical techniques show particles ranging from 1–60 μm, with spherical shapes and smooth surfaces. However, supercritical fluids have limited compatibility with water, making direct use in aqueous solutions challenging. Thus, integrating supercritical fluid technology with traditional spray drying remains a promising research area, though it's still underdeveloped in China, despite global interest.
With advancements in computer technology, solving complex mathematical models for spray drying has become more feasible. International research has focused on modeling, calibrating, and optimizing CFD simulations for various drying systems, including horizontal, centrifugal, and large-scale pressure spray drying. These studies have led to significant improvements in understanding and optimizing the drying process.
Shanghai Xinzhuang has a team of industry-recognized experts and top-tier technical professionals. We are committed to delivering the highest quality products and services to earn our customers' trust. Every product and every step of the process receives our full attention and dedication.
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