雙相流超音速渦輪地熱發電系統與關鍵設備的理論建立與模擬分析

Theoretical analysis of key equipment for a geothermal power generator system using a supersonic two-phase flow turbine

呂孟恩(Meng-En Lu)

指導教授 ： 陳希立

國立臺灣大學/工學院/機械工程學研究所/碩士(2020年)

https://doi.org/10.6342/NTU202003170

摘要

本研究的目標為建立全流式地熱發電機組的系統分析模型。此模型將以熱力學作為理論基礎進行分析，計算各階段的流體性質變化。透過代入實際地熱井作為初始條件，計算出發電功率和熱效率，作為評估發電系統之參考。然後考慮系統分析模型中不同的條件，藉此分析各項變因與輸出功率、熱效率的關係。從結果發現流體的溫度、乾度以及質量流率增加，對於輸出功率的提升有顯著效果，以及流體溫度、乾度提升，有助於熱效率改善的現象。為了更精確分析發電系統，針對兩相流超音速噴嘴以及斜衝擊式渦輪機，瞭解其物理特性和分析理論。從噴嘴與渦輪機的理論分析結果，加強先前的系統分析模型。

關鍵字

地熱發電系統 ； 熱力學 ； 超音速流 ； 噴嘴 ； 渦輪機

並列摘要

The purpose of this research is to establish an analysis model of a total flow geothermal power plant system. The analysis theory of this model is based on thermodynamics, and this model calculates the changes in fluid properties at each stage. By entering the initial conditions of actual geothermal wells, the power output and thermal efficiency are calculated, which is able to be a reference for evaluating the power generation system. Then different conditions in the analysis model are considered to realize the relationship between power output and thermal efficiency. From the results, the increase in the temperature, quality and mass flow rate of the fluid has a significant effect on the improvement of the power output, and the increase in the temperature and quality of the fluid contributes to the improvement of thermal efficiency. In order to analyze the power generation system more accurately, the physical characteristics and analysis theory of the two-phase flow supersonic nozzle and the oblique imposed turbine present in the research. The previous system analysis model is modified with the analysis results of nozzles and turbines.

並列關鍵字

geothermal power generation system ； thermodynamics ； supersonic flow ； nozzle ； turbine

參考文獻

2019年台灣電力公司永續報告書

2018非生產性質行業能源查核年報

R. Bertani, Geothermal power generation in the world 2010-2014 update report, Geothermics, 60, 31-43, 2016.

宋聖榮，“臺灣地熱能源發展的現況、展望與困境”，國立臺灣大學地質科學系

Liangyu Xia, Yabo Zhang, An overview of world geothermal power generation and a case study on China—The resource and market perspective, Renewable and Sustainable Energy Reviews, 112, 411-423,2019