風力蓄壓儲能系統之研發

Abstract

空氣是一種具有多種優點的再生能源，它是免費、隨處可得，儲存起來的空氣壓力可作多樣的 應用，如用氣壓推動發電機發電、過濾污水、產生推力驅動汽車、冲打漁塭水以提供氧氣等，所以 儲存空氣壓力的方法，特別是如何有效和低成本地利用風力來儲存壓縮的空氣便值得作深入的研 究。本計畫擬開發一種利用風力來壓縮空氣和將氣壓儲存在複合材料壓力容器中的風力蓄氣壓系 統，其中此系統所用之風機為垂直式，葉片是用複合材料製作，並具創新的葉型，可使葉片在不同 的轉角位置都能產生正扭矩，有助於風機的起動和效率的提升。在風速大於5m/s 時，風機便可產生 足夠扭力來驅動一創新凸輪和活塞來壓縮空氣及將壓縮的空氣儲存在複合材料壓力容器中，使空氣 壓力可以達到3 個大氣壓以上。故本複合材料空壓產生和儲存系統因質輕耐腐蝕，易於搬運及組裝， 適合用在沿海及離島地區。本計畫將利用空氣動力分析、最佳設計、有限單元法等方法來研製此系 統中的重要部件如風力葉片、凸輪和活塞組、壓力容器等；各重要部件均進行強度、疲勞試驗或液 壓試驗，瞭解其失效模態，以確保設計和製造方法的合宜性。組裝後之系統進行功能、效率和可靠 性等項目的測試，以驗證系統的可用性。最後，本系統與污水過濾部件整合，測試其應用性及穩定 性，並掌握系統在應用面之整合技術。

Air is a renewable energy with many advantages such as free for use and being able to be extracted anywhere. Pressurized air can find many applications. For instance, it can be used to generate electricity, filter contaminated/waste water, power a car, pump air into fish ponds etc. Therefore, how to pressurize air and store the pressurized air, especially, how to use wind power to do it in an efficient and cost effective way has become an important topic of research. In this proposal, a new air pressurized and storage (APS) system is developed. The system uses a new vertical-axis-wind turbine (VAWT) to produce power to actuate a cam and piston pair for pressurizing air. Through a pipe, the pressurized air is the stored in a series of composite pressure vessels which can store at least 3 bar pressurized air. The wind blades of the VAWT are made of composite materials and able to produce enough torque to produce the pressurized air at wind speed above 5m/s. The cross-sectional profiles of the wind blades are designed in such a way that the wind turbine can produce positive torque at any rotating angle. The excellent characteristics of the wind blades can help the wind turbine increase its mobility, corrosion resistance, and efficiency. Therefore, the proposed APS system having the advantages of being easy for transportation and assembling is suitable to be installed at the coastal areas and remote islands. In this project, the techniques of computational aerodynamics, optimization, finite element method will be used to develop the critical parts such as wind blade, cam and piston pair, and pressure vessel. All the critical parts after fabrication are subjected to strength and fatigue tests or fluid pressure testing. Through the failure mode analyses of the parts, the suitability and sufficiency of the design and fabrication methods are verified. After assembling the APS system, the functional, efficiency, and endurability tests are performed to validate the design suitability of the system. Finally, the APS system is used to filter contaminated/wasted water to attain the system integration technology for filtration applications.