共查询到19条相似文献,搜索用时 218 毫秒
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概略介绍了PPC干燥系统工艺,从物料衡算、热量衡算的角度详细介绍了本系统内关键设备的选型,同时从设备组成、原理、材质等方面重点解析了本系统核心设备的结构特点,为相似物料特征的干燥系统设备选型提供了有益参考. 相似文献
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热泵干燥节能技术研究与经济评价 总被引:1,自引:0,他引:1
本文提供了一套热泵干燥实验装置及流程,并在整个干燥周期内对其动态性能进行了全面考察。对装置的适宜操作范围进行实验,运用正交实验法找到一组使得热泵干燥单位能耗最小的最优操作条件。以陶瓷粘土、木材、棉布为干燥物料,进行热泵干燥与电加热干燥节能对比实验表明,热泵干燥的节能效果为50~57%。本文还对热泵干燥、电加热干燥、蒸汽加热干燥的一次能源消耗和能源费用进行了比较和经济评价。 相似文献
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对影响聚丙烯粉料干燥效果的因素和设备结构进行分析,并对整个系统做热量衡算和物料衡算,分析了循环氮气的流量、流化床的干燥温度等因素影响粉料干燥的效果。 相似文献
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Heat pump–assisted dryers are an alternative method for drying heat-sensitive food products at low temperature and less relative humidity with lower energy consumption. The mathematical models of a heat pump dryer consist of three submodels; namely, drying models, heat pump models, and performance models. Heat and mass balance of both refrigerant and air circuits in all components of the system are used for development of mathematical models. The models are used for design of different components of heat pump dryers operating under constant drying rate condition. A simple stepwise design procedure for batch-type, closed-loop heat pump dryer is also presented. 相似文献
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水循环式热泵干燥装置是指热泵和干燥部分通过水循环耦合而成的热泵干燥系统,是一种中小型热泵干燥装置的结构型式。对水循环式热泵干燥装置的开机过程、调控特性、能源效率进行了分析,相关结论可为推广应用提供参考。 相似文献
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Simulation of the heat pump cycle and the drying process has been carried out to obtain the design parameters of the dryer. The analysis indicates that a specific moisture extraction rate (SMER) greater than 3.4 kg/kWh can be obtained. A box-type heat pump dryer has been developed and investigated for the performance of drying of shredded radish. Heat pump drying took 1.0–1.5 times longer than hot air drying. However, the heat pump dryer showed considerable improvement in energy savings. The SMER of the heat pump dryer was about three times higher than that of the hot air dryer. 相似文献
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热泵干燥具有节能、低温干燥及环境友好等特点,控制热泵干燥装置运行在较佳的状态,是保证热泵干燥装置效率和可靠性的基础。以带循环空气旁通的封闭式热泵,干燥装置为例,对热泵干燥装置的调控方法进行了分析,给出了装置的被控参数和一组较佳的控制参数,并建立了各控制参数的计算公式。 相似文献
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Saffron is the most expensive spice and Iran is the largest producer of this crop in the world. Saffron quality is profoundly affected by the drying method. Recent research has shown that hybrid photovoltaic–thermal solar power systems are more efficient in comparison with individual photovoltaic and thermal systems. In addition, heat pump dryers are highly energy efficient. Furthermore, they are suitable for heat-sensitive crops such as saffron. Therefore, in the present study, the performance of a hybrid photovoltaic–thermal solar dryer equipped with a heat pump system was considered for saffron drying, in order to obtain a high-quality product and reduce fossil fuel consumption. The effect of air mass flow rate at three levels (0.008, 0.012, and 0.016 kg/s), drying air temperature at three levels (40, 50, and 60°C), and two different dryer modes (with and without the heat pump unit) on the operating parameters of the dryer was investigated. The results of the investigation showed that total drying time and energy consumption decreased as air flow rate and drying air temperature increased. Applying a heat pump with the dryer led to a reduction in the drying time and energy consumption and an increase in electrical efficiency of the solar collector. The average total energy consumption was reduced by 33% when the dryer was equipped with a heat pump. Maximum values for electrical and thermal efficiency of the solar collector were found to be 10.8 and 28%, respectively. A maximum dryer efficiency of 72% and maximum specific moisture extraction rate (SMER) of 1.16 were obtained at an air flow rate of 0.016 kg/s and air temperature of 60°C when using the heat pump. 相似文献
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Guadalupe Huelsz Leonardo Urbiola-Soto Francisco López-Alquicira Raúl Rechtman Guillermo Hernández-Cruz 《Drying Technology》2013,31(5):576-586
A total energy balance method for venting electric tumbler dryers was developed and the experimental methodology and calculation details are provided in this article. The energy to evaporate the water in the load; the energy to heat the water, textile, and dryer; energy losses by convection and radiation; and the energy not used in the process were considered to calculate the total output energy. This method was applied to a domestic venting electric tumble dryer. The results of the method suggested areas of improvement. The maximum difference between the measured total input and the calculated total output energies was 2.6%, indicating the accuracy of the method. 相似文献
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One of the methods with the most potential to reduce energy consumption in grain drying is heat recovery from the dryer exhaust air. A parallel plate heat exchanger to recover heat energy from the exhaust air of a recirculating batch grain dryer was examined by theoretical assessments as well as by measurements in a scaled-down research dryer and experimental heat exchanger. In addition to the heat transfer performance, the operability in dusty conditions was investigated. Finally, the optimization of the heat exchanger was introduced by the aid of the calculation models and practical measurement. The heat exchanger performed satisfactorily, providing an average energy saving of approximately 18%. A significant improvement in the performance could be achieved by increasing the air velocity. No severe dust accumulation was observed, and a heat exchanger of this type could provide remarkable energy saving possibilities in grain drying. Further tests are necessary to ensure the operability in long-term use. 相似文献