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1.
针对加热炉汽化冷却系统所产饱和蒸汽在非采暖期大量放散的现状,通过实例提出可用这类蒸汽制冷,作为夏季某些单位空调之用。这样就可以用较少的投资解决非采暖期的汽冷余热浪费问题,合理利用热能,降低轧钢成本。 相似文献
3.
The half-lives (t
1/2) for evaporative loss ofn-alkyl andn-alkenyl acetates from rubber septa were determined at temperatures varying from 15 to 35 °C. The changes int
1/2 with temperature gave high correlations with the equation, Int
1/2 = H/RT+y
o where H is the heat of vaporization,R is the gas constant,T is the absolute temperature, andy
o is a constant. Half-lives changed dramatically with temperature and the degree of change with temperature increased with increasing molecular weight. For mixtures, component ratios changed with temperature, but the degree was modest. At 20 °C there was a 7.5-fold ratio oft
1/2 between members of the homologousn-alkyl orn-alkenyl acetates differing by two carbon atoms. The large change int
1/2 with temperature and with number of carbon atoms is a consequence of the thermodynamic relationships and the temperature range of pheromone usage. Therefore, a similar degree of change inf
1/2 with temperature and number of carbon atoms will apply to other formulations of the same type (those in which the rate of evaporation is first order). The values oft
1/2 at 20 °C mainly agreed very well with those reported previously at room temperature. However, our previously reported values for pentadecyl and hexadecyl acetate were revised. Half-lives were shown to depend on the vapor pressure of a compound in the formulation substrate, but not on the vapor pressure of the pure compound.Mention of a commercial or proprietary product does not constitute an endorsement by the USDA. 相似文献
4.
Zinc vaporization of Mn-Zn ferrites was quantitatively characterized in terms of oxygen partial pressure P O2 , temperature, grain size and sample geometry. The amount of zinc loss was measured as a function of time at various temperatures by a thermogravimetric method. The weight loss due to irreversible zinc vaporization showed a linear behavior with time and increased exponentially with temperature. The observed weight loss due to zinc evaporation at 1100°C was small, whereas a significant weight change was detected at 1200°C. The weight loss was even greater in a reducing atmosphere ( P O2 = 5 × 10−5 ). Below 1300°C, the diffusion of elemental zinc was sufficiently fast to compensate the zinc loss at the interface region, resulting in a linear dependence on time. At temperatures ≥1400°C, the weight change no longer followed the linear dependence and showed a rather parabolic behavior with a concave upward slope. The core shape and the gas flow around ferrite cores were important factors that affected the rate of zinc vaporization, but not the grain size. 相似文献
5.
6.
颗粒多孔表面强化沸腾传热动力学研究 总被引:4,自引:0,他引:4
通过对颗粒多孔层几何结构、沸腾两相流及传热的理论分析,提出了微型通道薄膜环状蒸发物理模型和沸腾传热机理,建立了颗粒多孔表面强化沸腾传热动力学模型。该动力学模型与实验数据吻合良好,可用于工程设计。 相似文献
7.
应用FaetSage热力学软件对不同温度下的FeO—CaO—SiO2-Cl体系中Zn、Ph挥发行为进行分析,采用气流携带法对FeO—CaO-SiO2-Cl体系中Zn、Pb挥发物的饱和蒸气压进行测定,并通过试验分析了温度对其体系中Zn、Pb挥发率的影响。结果表明,温度为970~1030K条件下FeO-CaO-SiO2-Cl体系中Zn、Pb主要以氯化物形式存在,氯化物的饱和蒸气压均随着温度的升高而增加,且InP~1/T呈较好的线性关系,其体系中Zn、Pb挥发率亦随着温度的升高而增加。 相似文献
8.
Wei-Mon Yan 《加拿大化工杂志》1993,71(1):54-62
Numerical results are presented for effects of latent heat transport associated with film vaporization on laminar mixed convection heat and mass transfer in a vertical channel with a half channel width b = 0.01 m. The influences of the inlet liquid mass flowrate and wall temperature on the film vaporization and the associated heat and mass transfer characteristics are examined for air-water and air-ethanol systems with gas Reynolds number Reg = 2000. Predicted results obtained by including transport in the liquid film are contrasted with those where liquid film transport is neglected, showing that the assumption of an extremely thin film made in Lin et al. (1988) and Yan and Lin (1989) is only valid for systems having small liquid mass flow rates. Additionally, it is found that the interfacial heat flux is predominantly determined by latent heat transfer connected with film evaporation. 相似文献
9.
从理论上建立硫酸闪蒸的数学模型,并给出其具体算法,从而对硫酸闪蒸过程进行过程模拟.为验证模型及算法的有效性,对硫酸的闪蒸进行实验.实验证明了模型的准确性. 相似文献
10.
氟化电热蒸发ICP-AES中的基体干扰及机理研究 总被引:2,自引:0,他引:2
陈世忠 《武汉工业学院学报》2003,22(2):72-74
对氟化辅助电热蒸发电感耦合等离子体原子发射光谱(FETV-ICP-AES)中的基体效应及其机理进行了初步探讨。考察了基体元素Na、Ca、Zn对待测难熔元素Y的语线强度、蒸发过程和激发过程的影响。所得实验结果表明,与常规ICP-AES相比,在FETV-ICP-AES中的基体效应明显降低,其主要原因与试样的蒸发和激发(电离)分步进行,ETV-ICP体系具有更高的激发温度以及待测物和基体在蒸发过程中发生了选择挥发有关。 相似文献