谷物干燥机单位耗热量与处理量折算规则的研究

我国各种型式粮食干燥机的标准较多,而规定的标准环境条件几乎相同。但烘干机在实际生产使用和检测时,试验条件不可能统一在标准规定的状态下,因为没有标准折算规则,所以同一台干燥机在南方和北方或同一时间不同地区,就会出现合格或不合格的不同结果,无法进行科学的对比和评价。《谷物干燥机单位耗热量与处理量折算规则》标准的研究和制订,能够正确、科学和合理地用同一尺度把测试结果折算到一个标准状态下进行比对,能对粮食干燥机的主要性能指标进行正确评价,为干燥机的设计、生产制造和验收提供依据。     

干燥过程特性和干燥技术的研究策略

从对干燥过程特性认识的进展，变温干燥方法对提高干燥过程速率及防止降速干燥阶段物料变质的作用、干燥过程强化、节能和产品质量之间的关系，干燥理论和干燥过程模型化的进展及存在困难，以及近年来国际上对干燥技术的关注重点等方面为依据对我国的干燥技术研究策略作了简要的评述。     

环己醇生产工艺中水伴热系统的热耗量计算

以实际工艺数据和物料的物性参数为依据,采用热阻力方程和热传导方程,计算了环己醇生产工艺中水伴热系统的热耗量以及低压蒸汽的热效率,评价了原工艺设计中用低压蒸汽作为冬季管道伴热介质的优劣,验证了高温冷凝水作为伴热介质的可行性。     

降低燃天然气熔窑的单位玻璃液热耗

通过对天然气为燃料的熔窑使用中单位热耗高的问题进行分析,积极采取措施,将其控制在合理的范围内。     

粮仓搅拌干燥装置的试验研究

低温筒仓和自然通风干燥是常用的玉米干燥方式,但存在物料降水、降温不均匀和效率低等问题。针对低温筒仓干燥存在的问题,深入研究了仓内螺旋搅拌器的工作原理,设计了搅拌干燥试验台,研究了螺旋搅拌器结构参教和运动参教对搅拌器性能的影响,对七种不同尺寸的螺旋和两种粮食的干燥均匀性进行了对比试验,选出了较好的结构参数,为搅拌器的设计和应用提供了理论依据。     

旋转闪蒸干燥机干燥漂粉精热效率研究

研究了旋转闪蒸干燥设备干燥漂粉精时的运行热效率,研究了旋转闪蒸干燥设备在不同温度条件下干燥漂粉精的参数,并研究了干燥温度对漂粉精有效氯的影响.结果显示,随着温度的升高,漂粉精干燥需要的时间变短,最大干燥速率也随着干燥温度升高逐渐升高.根据闪蒸干燥机干燥过程中测定的运行参数,计算得到的干燥机热效率也随着干燥温度的升高而逐...     

多层圆振动流化床干燥机用于氢氧化锂干燥的研究

对多层圆振动流化床干燥机用于氢氧化锂的干燥进行了实验研究。得出了颗粒的停留时间与振动强度以及颗粒湿含量的关系,测出氢氧化锂在多层圆振动流化床干燥机中的干燥特性,并与该颗粒物料在箱式烘箱中的干燥特性进行比较。结果表明：颗粒的临界湿含量,在静态及振动流化床条件下,基本相同;但对于等速干燥速度,多层圆振动流化床条件下是静态条件下的22倍左右。这对了解多层圆振动流化床干燥机的干燥机理,以及对其进行放大设计,具有一定的参考价值。     

ZKY-01型箱式木材真空干燥机及干燥工艺的试验研究

介绍了ZKY-01型箱式木材真空干燥机的结构，采用浮压手段对榆木和酸枝木进行真空干燥试验。试验结果表明，ZKY-01型箱式木材真空干燥机的干燥效果与常规干燥相比，干燥速度大大提高，其干燥时间仅为常规干燥时间的15％左右；干燥质量好，没有发生端裂、表裂与变形等干燥缺陷；被干锯材的应力试片其齿条基本通直，应力指标为0．42％-0．76％。箱式木材真空干燥机具有一定的发展潜力。     

干燥的研究与发展：过去，现在和未来

简短回顾了国际干燥研讨会（IDS）和《干燥技术》期刊的发展史，并简要说明了干燥技术研发主题的时代和地理变化。最后提出在时下流行的研发领域竞争背景下，干燥技术研发在未来所面临的挑战。     

Experimental Research on Parallel Conversion Control of Drying Temperature in a Closed-Loop Heat Pump Dryer

The paper proposes a method to handle the challenge of temperature control in a closed-loop heat pump dryer that can operate both in heating cycle and refrigeration cycle. It is hard to avoid the violent fluctuations of drying temperature as the operation mode changes. Hence, the parallel conversion control is introduced to realize the accurate control of drying temperature. The main idea of the controller design lies in the use of different membership functions and fuzzy control rules for the two operation modes. Experimental results show that the temperature fluctuations are reduced when using parallel conversion control with fast and stable response as compared to the fixed-frequency and PID control system. One of the parameters, R _f , representing the value of undershoot ratio is 0.4, 0.48, and 0.64 when drying temperature is fixed at 30, 35, and 38°C, respectively, with a parallel conversion controller. In order to study the application prospects of the parallel conversion control system, a comparison experiment with different compressor frequency ranges was also conducted.     

回热式热泵干燥高湿稻谷的试验研究

应用带有嵌入回热器的热泵装置,对华南地区高湿稻谷进行干燥试验,测定其干燥速率、能耗和品质。并与同期作业的燃油低温循环稻谷干燥机进行对照。试验结果表明：回热式热泵干燥机的干燥速率较燃油低温循环干燥机提高20％,干燥周期缩短约12％,而干燥能耗及费用可节省30％以上,干燥品质两者无差异。     

Simulation of Grain Drying in Natural Convection Dryer

All the works so far on simulation of grain drying by natural convection of air presents conflicting reslts on the drying time forecast. In this work the models of Hukill, Thompson and Michigan are tested in same type of dryer. Appropriate equations are developed to correct the drying time, starting form the models of Thompson and Hukill. The solution of the equations of michigan model is developed on fintie difference and similarly and some speical technuques are utilized on the Thompson model. 53 test results are utilzed here to validate the simulation model of drying.     

Experimental Study of the Heat and Mass Transfer During Drying in a Fluidized Bed Dryer

ABSTRACT

Drying curves obtained in a pilot-scale fluidized bed dryer using biological source solids (sawdust, soya and fish meal) were used to estimate the parameters involved in heat and mass transfer phenomenas: heat transfer coefficient and moisture diffusivity coefficient. Parameters involved in mass transfer were estimated from drying models based on diffusional mechanisms and others that in addition consider internal and external resistance to the mass transfer. The estimate ef ective diffusivity coefficient was between 2x10-11 to lx10 (m2/s) for the considered products. Heat transfer coefficient was estimated from drying data points in the constant drying rate period when the external resistance to the mass transfer controls the process.     

Experimental Study on Energy Consumption of Combined Conventional and Dehumidification Drying

Conventional drying, dehumidification drying, and combined conventional-dehumidification drying of wood were experimentally studied in this article. The results showed that the energy consumption in the dehumidification drying is the least but its drying time is the longest. The energy consumption in the combined drying is more than that in the dehumidification drying but less than that in the conventional drying, and the drying time is half of that in the dehumidification drying. The advantages of the combined conventional and dehumidification drying are discussed from the experiments results.     

Experimental Study on Energy Consumption of Combined Conventional and Dehumidification Drying

Conventional drying, dehumidification drying, and combined conventional-dehumidification drying of wood were experimentally studied in this article. The results showed that the energy consumption in the dehumidification drying is the least but its drying time is the longest. The energy consumption in the combined drying is more than that in the dehumidification drying but less than that in the conventional drying, and the drying time is half of that in the dehumidification drying. The advantages of the combined conventional and dehumidification drying are discussed from the experiments results.     

Modelling and Simulation of Momentum, Heat, and Mass Transfer in a Deep-Bed Grain Dryer

This article concerns the modelling and simulation of a deep-bed grain dryer in a large diameter-column. Two-dimensional (2D) models of deep-bed grain dryers were built by considering simultaneously momentum, heat, and mass transfer in the drying phase together with coupled heat and mass balance in the grain phase. The dynamic equations are solved numerically by using finite difference method. The momentum equations are applied to simulate pressure drop and velocity field of the drying air across the bed. The mass and heat balance in the two phases determine the profile of temperature and moisture content in both phases. Further, drying rate curves for various temperature of inlet drying gas together with moisture content of grain were simulated. The simulated profiles are in close agreement with experimental data.     

热量回收系统工艺参数对变换蒸汽消耗的影响

采用对变换反应器和变换工艺进行计算机模拟、求出变换系统的吨氨蒸汽消耗的方法,对热量回收系统不同工艺参数（主要包括饱和热水塔及水加热器的各项温度参数,系统阻力,蒸汽温度等）条件下的吨氨蒸汽消耗分别进行了计算,并给出了各参数与吨氨蒸汽消耗之间的变化关系。