移動式顆粒床之進口粉塵濃度與再生循環對過濾效率的影響

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Title:	移動式顆粒床之進口粉塵濃度與再生循環對過濾效率的影響
Authors:	許端祐;Syu, Duan-you
Contributors:	機械工程學系
Keywords:	移動式顆粒床過濾器;粉塵濃度;篩分效率;過濾效率;moving granular bed filter;dust concentration;screening efficiency;collection efficiency
Date:	2017-01-19
Issue Date:	2017-05-05 17:42:06 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究依據先前開發針對中高溫除塵技術-移動式顆粒床過濾器及周邊子系統(如:氣體輸送系統、濾材/粉塵篩分系統及濾材循環再生系統等)，進行長時間冷性能連續化過濾運轉測試，本研究之實驗結果能提供未來建立中高溫除塵技術開發與商業化之依據。本論文中探討在顆粒床過濾器在面對不同粉塵濃度的情形下的情形；在滾筒篩分系統中，由於操作方法及粉塵含量的不同導致顆粒濾材與粉塵的篩分效率變化影響再生效率；在顆粒濾材之再生循環過程中，將微量粉塵經由再生循環管路回送至床體內部，其對整體顆粒床過濾效率之影響；以及在不同進氣口粉塵濃度的影響下，顆粒床過濾器整體過濾效率、壓降及出口粉塵粒徑的變化。實驗結果顯示，在滾筒篩分系統中，粉塵含量的多寡對其整體的篩分效率影響不大；在顆粒床過濾器整體之過濾效率方面，進風口於低粉塵濃度的條件下，顆粒床過濾器有著良好的過濾效率，其整體過濾效率的結果皆維持在99%以上，出口粉塵平均粒徑為1.75 μm 以下。但在進氣口於高粉塵濃度的條件下，由於顆粒床過濾器其床體內部粉塵含量處於過飽和的情形，使得顆粒床過濾器整體的過濾效率、出口粉塵粒徑皆產生大幅度的波動；研究實驗結果顯示，於濾材質量流率480 g/min、滾筒轉速21.5 rpm，在入口表面風速70 cm/s 的條件下，可以得到較佳的過濾效率與出口粉塵平均粒徑，分別為98.6 %與 3.65 μm。;This study is based on the high temperature dust removal technology- Moving Granular Bed Filter and other subsystems (e.g. Gas delivery system, Filter/dust screening system and Filter recycle system) operation test for long term. The experimental results can provide the future development of high-temperature dust removal technology and commercial basis. This thesis investigated the operation of granular bed filter in different conditions of dust concentration, the regeneration efficiency is affected by the different separation rates due to different operation methods and dust contents in the drum screening system, the influence of overall efficiency of the granular bed filter from trace dust through the regeneration cycle pipeline back into the granular bed in the regeneration process, and the variation of the whole collection efficiency, pressure drop and export dust size in different inlet dust concentration. The experimental results showed that the amount of dust contents cannot affect its overall screening efficiency in the drum screening system. For the overall filter efficiency of the granular bed filter, the import with low dust concentration can provide great collection efficiency and low export dust size, each of them are more than 99% and less than 1.75μm respectively. But when the condition of high dust concentration that collection efficiency and dust size has a large fluctuation due to supersaturation of the dust content inside the granular bed. The experimental results show that the mass flow rate of filter media is 480 g/min and the rotational speed is 21.5 rpm. On the condition of inlet velocity of 70 cm/s, the collection efficiency and dust size is 98.6% and 3.65 μm.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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