住宅用光热沼气联合发电系统的建模与仿真
发布时间：2018-08-11 15:33
【摘要】：住宅用光热沼气联合发电系统对于小规模利用太阳能热发电模式研究有着重要意义。该系统将光热发电与沼气发电相结合,以光热发电作为首要的电能输出部分,并加设了蓄热系统和辅助热源(沼气),在太阳辐射不足时由辅助热源补足热量,夜间没有太阳能时可利用沼气进行发电。从而使两者协调工作以互补供电的形式对用户供电,实现光热与沼气供电系统不间断供电的目的。该系统由集热子系统,蓄热子系统,动力子系统三部分构成,其中集热子系统核心部件采用复合抛物面槽式太阳能集热器(CPC聚光集热器),动力子系统采用微型汽轮发电机,蓄热系统采用创新结构设计的垂直螺旋板中低温相变蓄热装置蓄热。文中首先利用Solidworks做出CPC聚光集热器和蓄热装置模型图,并利用LigntTools模拟CPC聚光集热器光线轨迹,从而仿真得聚光集热效率为42%。然后利用FLUENT软件仿真蓄热装置中的吸热、放热过程,得到PCM相变材料的温度、液相率等变化分布云图,从而分析得出装置放热效率为91.6%。之后利用Simulink对系统各部分元件建模,包括介质水熵、焓等参数计算模块,对本文系统整体建模计算,进行参数估算。通过对系统整体的建模分析可知,当系统额定发电功率能够达到满足住宅用电20kW时,系统峰值发电效率可达8.6%,年平均发电效率为3.7%。模拟出某一天的各子系统工作时间及配合工作方式,提出本文系统的控制策略,验证本文提出的宅用光热沼气联合发电系统的工作可能性。根据各子系统装置的参数,构建宅用光热沼气联合发电系统实验平台。结果表明该系统能够达到宅用光热沼气联合供电的目的,在农村住宅使用太阳能、沼气等清洁能源供电方面提供了理论依据。
[Abstract]:The photothermal biogas combined power generation system for residential use is of great significance to the research of solar thermal power generation model on a small scale. The system combines photothermal power generation with biogas power generation, takes photothermal power generation as the primary power output part, and adds a heat storage system and auxiliary heat source (biogas) to replenish the heat from the auxiliary heat source when the solar radiation is insufficient. Biogas can be used to generate electricity when no solar energy is available at night. So that they can supply power to users in the form of complementary power supply, and realize the purpose of uninterrupted power supply of light and heat power supply system and biogas power supply system. The system is composed of three parts: heat collection subsystem, heat storage subsystem and power subsystem. The core components of the collection subsystem are the composite paraboloid trough solar collector (CPC concentrator), and the power subsystem uses micro turbine generator. The thermal storage system adopts the innovative structure design of the low temperature phase change heat storage device in the vertical spiral plate. In this paper, the model diagram of CPC concentrator and heat storage device is made by using Solidworks, and the ray track of CPC concentrator is simulated by LigntTools. Then the endothermic and exothermic processes in the heat storage device are simulated by FLUENT software, and the temperature and liquid phase change distribution of PCM phase change material are obtained, and the exothermic efficiency of the device is 91.6. Then Simulink is used to model the components of the system, including the calculation module of the medium entropy, enthalpy and other parameters. The whole system is modeled and calculated, and the parameters are estimated. Through modeling and analysis of the whole system, it can be seen that when the rated power of the system can meet the residential 20kW, the peak generation efficiency of the system can reach 8.6, and the annual average generation efficiency is 3.7. The working time and working mode of each subsystem are simulated, and the control strategy of the system is put forward, which verifies the feasibility of the system proposed in this paper. According to the parameters of each subsystem, the experimental platform of the photothermal biogas combined power generation system for residential use is constructed. The results show that the system can achieve the purpose of combined power supply of light and heat biogas, and provide the theoretical basis for the use of solar energy, biogas and other clean energy in rural residential power supply.
【学位授予单位】：沈阳农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM61
，
本文编号：2177413
[Abstract]:The photothermal biogas combined power generation system for residential use is of great significance to the research of solar thermal power generation model on a small scale. The system combines photothermal power generation with biogas power generation, takes photothermal power generation as the primary power output part, and adds a heat storage system and auxiliary heat source (biogas) to replenish the heat from the auxiliary heat source when the solar radiation is insufficient. Biogas can be used to generate electricity when no solar energy is available at night. So that they can supply power to users in the form of complementary power supply, and realize the purpose of uninterrupted power supply of light and heat power supply system and biogas power supply system. The system is composed of three parts: heat collection subsystem, heat storage subsystem and power subsystem. The core components of the collection subsystem are the composite paraboloid trough solar collector (CPC concentrator), and the power subsystem uses micro turbine generator. The thermal storage system adopts the innovative structure design of the low temperature phase change heat storage device in the vertical spiral plate. In this paper, the model diagram of CPC concentrator and heat storage device is made by using Solidworks, and the ray track of CPC concentrator is simulated by LigntTools. Then the endothermic and exothermic processes in the heat storage device are simulated by FLUENT software, and the temperature and liquid phase change distribution of PCM phase change material are obtained, and the exothermic efficiency of the device is 91.6. Then Simulink is used to model the components of the system, including the calculation module of the medium entropy, enthalpy and other parameters. The whole system is modeled and calculated, and the parameters are estimated. Through modeling and analysis of the whole system, it can be seen that when the rated power of the system can meet the residential 20kW, the peak generation efficiency of the system can reach 8.6, and the annual average generation efficiency is 3.7. The working time and working mode of each subsystem are simulated, and the control strategy of the system is put forward, which verifies the feasibility of the system proposed in this paper. According to the parameters of each subsystem, the experimental platform of the photothermal biogas combined power generation system for residential use is constructed. The results show that the system can achieve the purpose of combined power supply of light and heat biogas, and provide the theoretical basis for the use of solar energy, biogas and other clean energy in rural residential power supply.
【学位授予单位】：沈阳农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM61
，
本文编号：2177413
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