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Aishi Zhu 《International Journal of Green Energy》2018,15(3):201-207
The storage of fresh agricultural products is not easy because of its high moisture. Dehydration is an efficient preservation method. The investigation of drying modeling and transfer characteristics are important for selecting operating conditions and equipment design. The drying behavior of Lactuca sativa slices, with the thickness of 2 mm, was investigated at 60.0–80.0°C and 0.60–1.04 m sec?1 velocity in a convective hot air drier. The mass transfer during the drying process was described using six thin drying models. The convective heat transfer coefficient α and mass transfer coefficient kH were finally calculated. The results showed that the drying process could be separated into three stages including accelerating rate, constant rate, and falling rate period, which was influenced by hot air temperature and velocity, and the Modi?ed Page model agreed well with the experimental data. When the operating temperature was increased from 60.0°C to 80.0°C, α was found increased from 88.07 to 107.93 W·m?2·K?1, and kH increased from 46.32 × 10–3 to 68.04 × 10–3 kg·m?2·sec?1·ΔH?1. With the increase of air velocity from 0.60 to 1.04 m·sec?1, α was increased from 78.85 to 101.35 W·m?2·K?1, and kH was enhanced from 51.78 × 10–3 to 65.85 × 10–3 kg·m?2·sec?1·ΔH?1. 相似文献
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基于利用烟气余热的污泥低温干化技术,通过模拟试验和结合工程实践,首次分析研究了污泥对烟气中颗粒物的去除作用及其影响因素.结果表明,被试的四种污泥对烟气中PM2.5、PM10和TSP的去除率分别为18%~42%、32%~55%和39%~62%,污泥对烟气中PM2.5去除率的大小与污泥的细微结构和有机质含量相关联,烟气中颗粒物的去除率随污泥堆积密度和污泥含水率的增加而增加,随污泥粒度的增加而减少,污泥粒径变小时,污泥中水分更容易蒸发成微小水滴,有利于烟气中的细小颗粒物被吸附和凝结. 相似文献
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Changes in nitrification rates of an acid grassland soil with and without air drying have been monitored over 9 days, after first flushing native nitrate from the soils with deionised water. The results confirmed that full re-establishment of nitrification after air drying takes several days, supporting the hypothesis that any immediate first flush of nitrate from air-dried soils originates from cell lysis or flushing of ‘stored’ nitrate. Ammonium spiking confirmed that nitrification was not ammonium substrate limited. It was also found that ammonium accumulates in the soil during the drying process, providing a substrate pool once the population of nitrifiers has re-established. Over the first week of incubation, nitrate immobilisation was less conspicuous in the soil that had been rewetted after air drying compared with the incubated field moist soil. 相似文献
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为实现放射性浓缩液最大程度减容,设计了桶内干燥系统,基于物料衡算与热量衡算,建立了干燥过程动态数学模型,考察了不同的工艺条件对系统总体运行参数的影响,预测了桶内物料质量、含盐率、理论料面高度、温度、蒸发速率等关键参数随时间的变化规律。结果表明:干燥总时长随加热功率、浓缩液含盐率、浓缩液温度、最终干燥盐分湿含率以及第一阶段单次加料体积的增大而减小;干燥初期,新物料的加入对桶内含盐率有较为显著的降低作用;提高干燥强度将降低料面高度,间接降低热能有效利用率;在典型的工艺条件下,桶内干燥系统理论干燥总时长为281.19h,平均蒸发速率为3.43kg/h,平均处理能力为4.05L/h。为桶内干燥系统设计及试验提供理论指导。 相似文献
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目前我国城市污水厂产生的湿污泥数量巨大,但大多未能得到安全处置。污泥干化作为解决城市污泥最终减量化、无害化、稳定化和资源化的重要处理方式,近年来得到广泛推广。与其他污泥干化工艺相比,"二段法"干化工艺在能耗、安全性等方面具有明显优势,越来越受到国内外的青睐。但另一方面,某些地区的污泥出现纤维含量高、易混入硬物、黏性高等问题,又阻碍其生产稳定运行。通过苏州工业园区污泥干化项目的实践,因地制宜,对"二段法"干化工艺在运行中出现的问题采取了针对性改进措施,实现了生产连续稳定运行。 相似文献
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In the present work, the thin layer drying kinetics of potato during natural convection solar drying was investigated experimentally. Cylindrical potato samples with length 50 mm and varying diameter of 8, 10 and 13 mm were dried in an in-house designed and fabricated laboratory scale mixed-mode solar dryer. Thirteen different thin-layer mathematical models were fitted to the experimental moisture ratio (MR) data. The obtained results indicated that the Modified Page model could satisfactorily describe the drying curve of potato cylinders with higher value of R2 and lower values of RMSE and χ2. The shrinkage parameter is incorporated in the analytical diffusion model to study the moisture transfer mechanism of potato cylinders. It was observed that the values of effective diffusion coefficient (Deff) and convective mass transfer coefficient (hm) are overestimated in the range of 85.02–90.27% and 39.11–45.11% for the range of sample diameter examined, without considering the shrinkage effect in the mass transfer analysis. A Multiphysics approach was adopted in this study to get insight into the drying behavior of potato cylinders in terms of food-moisture interactions during the solar drying process. The predicted results of MR are in close agreement with the experimental data. Moreover, the anisotropic behavior of shrinkage as well as the moisture distribution inside the potato cylinder was very well described by Multiphysics model. 相似文献
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