太阳能与生物质能互补的能源系统研究

发布时间：2018-01-23 12:10

本文关键词： 太阳能热发电生物质直燃互补利用变辐照调节方法生物乙醇冷热电联产　出处：《中国科学院研究生院（工程热物理研究所）》2014年硕士论文　论文类型：学位论文

【摘要】：化石能源短缺以及化石能源利用过程中带来的环境污染和全球变暖已成为制约人类社会可持续发展的瓶颈,能源结构的变革势在必行,可再生能源以其清洁环保和取之不尽等优势将逐渐取代传统化石能源。近年来,太阳能和生物质能作为两种重要的可再生能源得到了国际学术界和工业界的高度关注。本学位论文依托国家自然科学重点基金项目、国家973项目等科研任务,开展了太阳能与生物质能互补利用的能源系统研究。具体工作如下： (1)为克服单独槽式太阳能热发电效率低和单独生物质直燃发电规模小的难题,提出了新型太阳能与生物质能互补发电系统,模拟计算了系统的热力性能,对系统进行了(?)平衡分析,讨论了新系统中利用太阳能取代汽轮机不同级抽汽加热给水对系统热力性能的影响。 (2)针对新型太阳能与生物质能互补发电系统在太阳辐照偏离设计点的运行工况,提出了变燃料进料量调节和变工质流量调节两种变辐照调节方法,研究并比较了太阳辐照强度从从500W/m2变化到900W/m2时两种变工况调节方法下的系统热力性能。变燃料进料量调节可以维持稳定出功和较高的太阳能净发电效率,变工质流量调节可以维持较高的太阳能份额。 (3)模拟研究了乙醇水蒸气重整制氢反应过程,探讨了反应的操作条件(包括温度、压力和水醇比)对重整反应产物的影响。将太阳能热驱动乙醇水蒸气重整的热化学反应过程与冷热电联产有机结合,提出了太阳能与生物乙醇热化学互补的微燃机冷热电联产系统。系统利用太阳能供热驱动乙醇水蒸气重整产生富氢气体,并以之作为燃料带动冷热电联产系统的运行,对系统进行了能量平衡分析和(?)平衡分析,模拟了系统在变辐照条件下的热力性能,讨论了微燃机透平入口初温、压比、回热器最小传热温差等关键参数对系统热力性能的影响。
[Abstract]:The shortage of fossil energy and the environmental pollution and global warming caused by fossil energy utilization have become the bottleneck restricting the sustainable development of human society. The transformation of energy structure is imperative. Renewable energy will gradually replace the traditional fossil energy in recent years because of its advantages of clean, environmental protection and inexhaustible. Solar energy and biomass energy as two important renewable energy have been highly concerned by the international academia and industry. Based on the research tasks of the National Natural Science Foundation and 973 projects, this dissertation has carried out the research on the energy system in which solar energy and biomass energy complement each other. The specific work is as follows: In order to overcome the problems of low efficiency of single trough solar thermal power generation and small scale of direct combustion power generation of biomass, a new type of solar energy and biomass energy complementary power generation system is proposed, and the thermodynamic performance of the system is simulated and calculated. The system has been drilled? The influence of solar energy instead of steam turbine's different stage extraction heating feed water on the thermodynamic performance of the new system is discussed. 2) aiming at the operating condition of a new type of solar energy and biomass energy complementary power generation system deviating from the design point of solar irradiation, two methods of variable irradiation regulation, variable fuel intake regulation and variable working fluid flow regulation, are proposed. This paper studies and compares the thermal performance of the system under two off-condition regulation methods when the solar radiation intensity changes from 500W / m2 to 900W / m2. The variable fuel feed regulation can maintain stable output and high power. Net solar power generation efficiency. Variable fluid flow regulation can maintain a higher share of solar energy. 3) the reaction process of ethanol steam reforming to produce hydrogen was simulated, and the operating conditions (including temperature) were discussed. The effect of pressure and ratio of water to alcohol on the products of the reforming was studied. The thermal chemical reaction process of ethanol steam reforming driven by solar energy was combined with the cogeneration of cold, heat and electricity. In this paper, a thermo-chemical co-generation system between solar energy and bioethanol is proposed. The system uses solar energy to drive the steam reforming of ethanol to produce hydrogen rich body. The system is used as fuel to drive the operation of the cogeneration system of cooling, heat and electricity, and the energy balance of the system is analyzed and analyzed. The equilibrium analysis simulates the thermal performance of the system under the condition of variable irradiation, and discusses the influence of the key parameters such as the initial temperature at the inlet of the micro gas turbine, the pressure ratio and the minimum heat transfer temperature difference of the regenerator on the thermal performance of the system.
【学位授予单位】：中国科学院研究生院（工程热物理研究所）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM61

【参考文献】