两段式塔式太阳能电站系统及腔式吸热器设计

发布时间：2018-05-31 01:45

本文选题：两段式塔式太阳能发电 + 系统组成　；参考：《华北电力大学》2014年硕士论文

【摘要】：塔式太阳能热发电技术是一项非常有前途的应用技术,由于塔式太阳能聚光温度高,可以获得较其他几种太阳能热发电高的热电转化效率,同时该技术适合于大容量发电。目前,国内外对于塔式太阳能发电技术都做了大量的研究,塔式太阳能发电技术应用已经接近大规模应用。在现有国内外塔式太阳能热发电研究的基础上,本文提出了一种新型的两段式塔式太阳能发电系统,首先对系统进行了整体设计,系统主要包括定日镜场、吸热器Ⅰ、汽水分离装置、吸热器Ⅱ、天然气补燃装置、蓄热系统和动力发电系统,对各个子系统进行了介绍,并给出了系统的分析计算方法和工质侧的热力学计算方法。然后,分析了两段式塔式太阳能系统的运行调节。太阳能热发电系统在运行时,需要考虑光照条件和变工况运行的影响。根据影响条件的变化,将系统的调节方式分为四种运行方式,并进一步分析了每个运行方式的汽水流程,通过计算得出了流量与光照条件的关系,吸热器Ⅰ出口工质干度的变化,以及不同光照条件下不同热负荷时蓄热量的变化,得出不同光照条件、不同负荷时的运行方式分布图,使得对系统的调节更加直观。最后,对吸热器建立辐射换热模型,分析几何结构尺寸与换热效果之间的影响,通过分析计算吸热器各面之间角系数、平均热负荷及开窗理论折算温度T0的影响,确定了吸热器尺寸。对吸热器进行了压降计算,分析气液两相流动特点,确定了受热面的管道布置,并通过水动力计算对其进行优化。
[Abstract]:The tower - type solar thermal power generation technology is a very promising application technology , because the tower - type solar concentrating temperature is high , the thermoelectric conversion efficiency higher than that of other types of solar thermal power generation can be obtained , and meanwhile , the technology is suitable for large - capacity power generation . At present , the tower - type solar power generation technology has a large amount of research on the tower - type solar power generation technology , and the tower - type solar power generation technology application has been close to the large - scale application .

This paper presents a new two - stage tower - type solar power generation system based on the existing domestic and international tower solar thermal power generation system . First , the whole system is designed . The system mainly includes heliostats , heat absorber I , steam - water separating device , heat absorber II , natural gas burning device , thermal storage system and power generation system . The subsystems are introduced , and the analytical calculation method and thermodynamic calculation method of working medium side are given .

Then , the operation regulation of the two - stage tower type solar system is analyzed . In operation , the solar thermal power generation system needs to take into account the influence of lighting conditions and variable working conditions . According to the change of the influencing conditions , the regulation mode of the system is divided into four operating modes , and the change of the heat storage capacity at different heat loads under different lighting conditions is obtained through calculation , and the distribution chart of the operation mode at different lighting conditions and different loads is obtained , so that the regulation of the system is more visual .

In the end , the radiation heat transfer model is established for the heat absorber , the influence of the size of the geometry structure and the heat transfer effect is analyzed . By analyzing the influence of the angle coefficient , the average heat load and the theoretical conversion temperature T0 of the heat absorber , the size of the heat absorber is determined . The heat absorber is subjected to pressure drop calculation , the characteristics of the two - phase flow of the gas - liquid are analyzed , the pipeline arrangement of the heated surface is determined , and the heat absorber is optimized by the hydrodynamic calculation .
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615

【参考文献】