摘要
采用多孔喷嘴的水喷射器系统,以加温水为工作流体,饱和蒸汽为引射流体,考察工作水温度、工作水流量和蒸汽温度等操作参数对喷射器系统引射性能和加热性能的影响,同时对喷射器出口混合流体的品质进行评价。结果表明,当工作水温度较低时,喷射器的质量引射系数和加热系数均随着工作水流量的增大而逐渐减小;而工作水温度相对较高时,质量引射系数随工作水流量的增大变化不明显;当工作水温度逐渐升高时,喷射器的质量引射系数和加热系数均逐渐减小,且工作水温为75℃时喷射器的加热系数急剧下降;当吸入蒸汽的温度升高时,喷射器的质量引射系数稍有所增加;但加热系数在工作水温度较高时没有明显提高,在工作水温度较低时反而随蒸汽温度的增加有所下降。通过对喷射器混合流体温度和焓值的分析发现,工作水温度较低,吸入蒸汽温度较高时,混合流体的温度和焓值都较高,因而其后续循环利用的潜能较大。
This study is aimed at testing and running a multi-nozzle water ejector system by using heated water as an energy source, or as a working fluid, in the same way as an ejecting fluid in the saturated steam. While doing our research, we have investigated the effects of such operating parameters, as the temperature of working water, the flowing rate of the said water and the temperature of the steam on the ejecting and heating performance of the ejector system. At the same time, we have also assessed the quality of the mixed fluid coming from the outlet of the ejector. The results of the entire experimental investigation prove that for lower temperatures of working water, the mass ejecting coefficient and the heating coefficient of the ejector tend to decrease with the increase of the current of the working water; however, even for the higher temperatures of the working water, the mass ejecting coefficient of the ejector proves also to vary insignifi- cantly. Another consequence can be discovered is that when the tem- perature of the working water has been gradually rising up, the mass ejecting coefficient and the heating coefficient of the ejector tends to drop down gradually, too, with the heating coefficient decreased rather sharply with the temperature of the working water heated to 75 ~C. In addition to the above results, with the increased inhale of temperature of the steam, the mass ejecting coefficient tends to in- crease slightly, though the heating coefficient also refused t9 improve remarkably at the high temperature of the working water. From the analysis of the temperature and enthalpy of the mixed fluid, it can be concluded that the temperature and enthalpy of the mixed fluid com- ing from the outlet are likely to stay relatively higher at the tempera- ture of working water being lower and the temperature of steam in- haled being higher. As a consequence, the mixed fluid under the above said conditions, there exists a more promising potential to be disclosed in the subsequent recycles.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2013年第1期67-71,共5页
Journal of Safety and Environment
关键词
环境工程学
节能技术
喷射器
质量引射系数
加热系数
操作参数
environmental engineering
technology of energy saving
ejector
mass ejecting coefficient
heating coefficient
operating parameters
