湿膜加湿器加湿性能的数值模拟分析

湿膜加湿是一种比较新型的空气加湿方法，从湿膜加湿器的加湿机理出发，建立了数学控制方程，利用有限差分法将控制方程离散，并利用MATLAB软件编程序求解。通过数值求解的结果，研究了湿膜加湿器的加湿性能，并对影响加湿性能的因素进行分析，为提高加湿性能提供理论依据。     

增湿器Ⅰ长期高温服役的脆化现象浅析

分析了增湿器Ⅰ产生脆化现象的原因。结果表明:奥氏体不锈钢因长期处于480℃高温服役,析出碳化物和σ相,致使材料严重脆化。     

一种超声波加湿器的动态性能研究

一种能应用于小型装置或实验室调节湿度的超声波加湿器,它通过加湿振子激振产生直径几微米的均匀雾状水粒来加湿.在对该种加湿器的工作过程进行了分析后,根据质量平衡原理,推导出加湿器加湿的动态数学模型,并对一个具体的装置进行了动态性能仿真和实验分析.结果表明本文建立的动态数学模型仿真得出的阶跃响应时间常数,及在不同占空比下加湿器出口的相对湿度与实验结果比较接近,能较好地反应加湿器中的加湿过程;另外仿真和实验结果也表明该加湿装置能根据加湿器工作时间占空比的不同,在很宽的范围内控制出口的湿度.     

加湿器智能控制系统的研究与设计

In recent years, home intelligence has become the trend of the development of life, people have higher and higher require- ments for the degree of home intelligence, and intelligent electrical equipment is more and more popular and recognized by every- one.Aiming at this situation, an intelligent control system is designed for the humidifier. The system uses a single chip microcomput- er as the control core and combines monitoring, control, display, alarm and execution modules to realize the real-time monitoring, alarm and control of air temperature and humidity, providing more convenience for intelligent family and providing some preference for the intelligentization design of electronic equipment.     

An analytical model of Nafion™ membrane humidifier for proton exchange membrane fuel cells

This paper introduced a one-dimensional analytical model to quantitatively examine the humidifying capacity of a Nafion™ membrane humidifier. Water permeability for the Nafion™ membrane was calculated, depending on the thickness of the Nafion™ membrane. Relative humidity for a carrier gas passed through the Nafion™ membrane humidifier was simulated at various gas flow rates, which showed good agreement with experimental data. Simulations were also conducted to predict humidity levels as a function of length and height of the gas flow channel. This analytical model can be used in future work to properly design Nafion™ membrane humidifiers for use in PEM fuel cell systems.     

增湿器产生应力腐蚀裂纹的原因探究

通过某实例分析,介绍了合成氨生产过程中增湿器内表面产生裂纹的原因是硫化氢应力腐蚀,并提出了行之有效的改进措施,实践证明,取得了较好的使用效果。     

质子交换膜燃料电池系统平板膜增湿器性能

分析了影响燃料电池系统中平板膜增湿器性能的因素,基于溶解扩散理论,描述平板膜增湿器增湿机制.利用费克定律、傅里叶定律、牛顿冷却定律建立了平板膜增湿器传质传热模型,通过实验和模型相结合的方式分析各个参数如何对平板膜增湿器传质、传热起作用,为气液换湿的平板膜增湿器设计提供依据.     

Thermodynamic performance experiment and cooling number calculation of a counter-flow spray humidifier in the HAT cycle

An experimental investigation of the thermodynamic performance of a counter-flow spray humidifier was conducted on the basis of theoretical analysis of the heat and mass transfer mechanism inside the humidifier. Critical parameters such as the temperature and relative humidity of air and the temperature of water at the inlet and outlet were measured. The influence of every measured parameter on the thermal performance of the humidifier was obtained under different experimental conditions. The cooling number, whose variation was also obtained, was calculated according to the measured data. The experimental results show that both the temperature and the temperature increment of outlet humid air and the temperature of outlet water increase with an increase of the water-gas ratio, whereas the cooling number decreases. Under all experimental conditions, the outlet humid air reaches or is close to the saturation level. The lower cooling number is favorable for the system, but it has an optimal value for a certain humidifier. __________ Translated from Journal of Power Engineering, 2006, 40(9): 1263–1267 [译自: 动力工程]     

一种神经网络PID控制在燃料电池测试系统中的应用研究

对燃料电池测试系统中露点加湿器的温度控制进行研究,提出了一种用BP神经网络进行参数整定、积分分离的PID控制算法.利用神经网络的任意非线性表达能力,通过对系统的学习来调整PID参数,实现最优的PID控制.通过在实际燃料电池测试系统中的实验表明,这一算法实现的PID控制系统控制稳态好、过冲小、收敛快.     

电热式加湿器的阻力计算及应用

简述了电热式加湿器的结构及其运行中出现的有关阻力的问题,提出管路阻力及加湿箱液面计算的方法,并分析了管路阻力对加湿器运行性能的影响。