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年度	107	專案性質	實驗性質
專案類別	研究專案	研究主題	整治
申請機構	中臺科技大學	申請系所	環境與安全衛生工程系
專案主持人	張益國	職等/職稱	副教授
專案中文名稱	設計底泥水力漩流器分離顆粒並驗證
中文關鍵字	底泥, 水力漩流, 分離
專案英文名稱	Designed hydrocyclone for sediments separation and performance validation
英文關鍵字	Sediment, Hydrocyclone, Separation
執行金額	970,000元
執行期間	2018/1/10 至 2018/11/30
計畫中文摘要	在河川或港區底泥疏濬過程中，受污染底泥實屬關注之焦點。近年來有許多處理方法被提出用於處理、再利用河川或港區底泥。而污染物經常附著於底泥細小顆粒(如黏土及砏土)表面上，在此一情形下，應可利用物理分離技術，先將大顆粒物質先予分離，可減容降低待處理污染底泥之體積。本研究搭配三維流場模擬軟體 FLUENT 進行模擬，設計水力漩流分離設備及操作條件，促進粗細顆粒分離，選取適當之粒徑(例如目標粒徑63µm設計達80%以上分離效率)，驗證實際效能與設計值差異。 經FLUENT模擬，水力漩流器最適設計條件為: 管徑156mm；入口直徑75mm、底部出口直徑33mm；入口進流速度4m/s。於此條件下，模擬出63μm顆粒可達82.1%分離效率。再經實驗驗證，台中灌溉渠道底泥小於63μm顆粒分離效率為78.0%，略低於設計分離效率；高雄港浚泥小於63μm顆粒分離效率為82.3%，接近設計分離效率。整體而言，本研究設計底泥水力漩流器可有效分離粗細顆粒，達分級效果。 關鍵詞: 底泥、水力漩流、分離
計畫英文摘要	Contaminated sediments in the river or harbor remain being significant issues during dredging operations. Numerous methods have been suggested in recent years for remove, treating and beneficial uses of river/harbor sediments. In this research, the basic characteristics and the geochemistry of the sediments were studied. The content of heavy metals contaminants might be primarily governed by the grain size. The optimum separation process was approached through hydrocyclone separation, which is designed to separate coarse and fine-grained particles by high settling velocity of particles. Furthermore, the FLUENT flow simulations are helping to calculate the cut-off size and fractional efficiencies in hydricyclone separators. The designed hydrocyclone performance validations are achieved by comparing the results from experiments with simulating results predicted by the FLUNET. The validation was set on target particle (63 µm fine particle) could reached separation efficiency better than 80%. Results from the FLUNET simulation showed that the optimum designed hydrocyclone parameters were nominal diameter of hydrocyclone of 156mm, inlet pipe diameter of 75mm, splitoff diameter of 33mm, inletvelocity 4m/s. Under upon conditions, a separation rate 82.1% for 63μm particle (fine particle) was calculated by FLUENT. Furthermore, hydrocyclone separation experiments were conducted, and the results showed that the 63μm particle separation efficiency were 78.0% for Taichung irrigation canal sediments, and 82.3% for Kaohsiung harbor sediments. It is concluded that comparing FLUENT simulation and experimental data, the designed hydrocyclone were effective in fine particles capture (63 μm) for sediments. The coarse and fine-grained particles could be separated well by hydrocyclone operation. Keywords: Sediment, Hydrocyclone, Separation