【摘要】：住宅用光熱沼氣聯(lián)合發(fā)電系統(tǒng)對(duì)于小規(guī)模利用太陽(yáng)能熱發(fā)電模式研究有著重要意義。該系統(tǒng)將光熱發(fā)電與沼氣發(fā)電相結(jié)合,以光熱發(fā)電作為首要的電能輸出部分,并加設(shè)了蓄熱系統(tǒng)和輔助熱源(沼氣),在太陽(yáng)輻射不足時(shí)由輔助熱源補(bǔ)足熱量,夜間沒有太陽(yáng)能時(shí)可利用沼氣進(jìn)行發(fā)電。從而使兩者協(xié)調(diào)工作以互補(bǔ)供電的形式對(duì)用戶供電,實(shí)現(xiàn)光熱與沼氣供電系統(tǒng)不間斷供電的目的。該系統(tǒng)由集熱子系統(tǒng),蓄熱子系統(tǒng),動(dòng)力子系統(tǒng)三部分構(gòu)成,其中集熱子系統(tǒng)核心部件采用復(fù)合拋物面槽式太陽(yáng)能集熱器(CPC聚光集熱器),動(dòng)力子系統(tǒng)采用微型汽輪發(fā)電機(jī),蓄熱系統(tǒng)采用創(chuàng)新結(jié)構(gòu)設(shè)計(jì)的垂直螺旋板中低溫相變蓄熱裝置蓄熱。文中首先利用Solidworks做出CPC聚光集熱器和蓄熱裝置模型圖,并利用LigntTools模擬CPC聚光集熱器光線軌跡,從而仿真得聚光集熱效率為42%。然后利用FLUENT軟件仿真蓄熱裝置中的吸熱、放熱過程,得到PCM相變材料的溫度、液相率等變化分布云圖,從而分析得出裝置放熱效率為91.6%。之后利用Simulink對(duì)系統(tǒng)各部分元件建模,包括介質(zhì)水熵、焓等參數(shù)計(jì)算模塊,對(duì)本文系統(tǒng)整體建模計(jì)算,進(jìn)行參數(shù)估算。通過對(duì)系統(tǒng)整體的建模分析可知,當(dāng)系統(tǒng)額定發(fā)電功率能夠達(dá)到滿足住宅用電20kW時(shí),系統(tǒng)峰值發(fā)電效率可達(dá)8.6%,年平均發(fā)電效率為3.7%。模擬出某一天的各子系統(tǒng)工作時(shí)間及配合工作方式,提出本文系統(tǒng)的控制策略,驗(yàn)證本文提出的宅用光熱沼氣聯(lián)合發(fā)電系統(tǒng)的工作可能性。根據(jù)各子系統(tǒng)裝置的參數(shù),構(gòu)建宅用光熱沼氣聯(lián)合發(fā)電系統(tǒng)實(shí)驗(yàn)平臺(tái)。結(jié)果表明該系統(tǒng)能夠達(dá)到宅用光熱沼氣聯(lián)合供電的目的,在農(nóng)村住宅使用太陽(yáng)能、沼氣等清潔能源供電方面提供了理論依據(jù)。
[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.
【學(xué)位授予單位】：沈陽(yáng)農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM61
，

本文編號(hào)：2177413