混燒飛灰中鋁金屬含量檢測方法建立暨濕式處理成效評估之研究

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Title:	混燒飛灰中鋁金屬含量檢測方法建立暨濕式處理成效評估之研究
Authors:	曾煜翔;Tseng, Yu-Hsiang
Contributors:	土木工程學系
Keywords:	固體再生燃料;流體化床鍋爐;含鋁金屬之混燒飛灰;混燒飛灰鋁金屬快篩檢測;混燒飛灰鋁金屬含量檢測;濕式處理;Solid Recovered Fuel;Circulating Fluidized Bed Boiler;Aluminum-Containing Co-fired Fly Ash;Rapid Aluminum Content Screening Test for Co-fired Fly Ash;Content Detection in Co-fired Fly Ash;Wet Treatment
Date:	2023-07-20
Issue Date:	2024-09-19 14:13:45 (UTC+8)
Publisher:	國立中央大學
Abstract:	固體再生燃料(SRF)由可燃性廢棄物製造而來，這類廢棄物包括民生廢棄物，例如塑膠、紙張及木材等。其中，部分來源再製成固體再生燃料因有鋁箔物質存在，與燃煤於CFB鍋爐進行混燒所衍生之混燒飛灰則因殘留鋁金屬物質，使得其再利用於水泥基材料中產生高度膨脹現象。本研究針對國內CFB鍋爐衍生之混燒飛灰進行材料性質分析，探討混燒飛灰應用於水泥基材料之膨脹因子。經研究結果顯示，混燒飛灰中之殘留鋁金屬成分於鹼性環境時，因氫氣產生進而造成試體高度膨脹。為提供鍋爐操作業者或再利用業者得以快速確認混燒飛灰具有產氫膨脹特性，建立混燒飛灰鋁金屬快篩檢測，以5分鐘試驗時間，即可有效鑑別混燒飛灰中殘留鋁金屬成分，即使混燒飛灰鋁金屬含量僅殘留0.02%，仍可藉由快篩檢測有效判別混燒飛灰中可反應性鋁金屬成分存在。此外，為量化混燒飛灰中可反應性鋁金屬含量，建立混燒飛灰鋁金屬含量檢測，並選定1.0M氫氧化鈉作為檢測試劑，即使混燒飛灰鋁金屬僅殘留0.02%，仍可有效檢出。最後，將具膨脹性混燒飛灰以濕式處理製作鹼激發砂漿試體，可發現試體已無高度膨脹現象發生，確認濕式處理可有效消弭研究之兩種混燒飛灰中可反應性鋁金屬。 ;Solid Recovered Fuel (SRF) is produced from combustible waste, which includes domestic waste such as plastics, paper, and wood. Notably, some of this waste is reprocessed into SRF and contains aluminum foil material. When co-fired with coal in a Circulating Fluidized Bed (CFB) boiler, the resulting fly ash retains aluminum metal substances. Consequently, its reuse in cement-based materials leads to volume expansion phenomena. This study carried out material property analysis on co-fired fly ash derived from domestic Circulating Fluidized Bed (CFB) boilers, investigating the expansion factor of co-fired fly ash applied to cement-based materials. The research findings reveal that the residual aluminum content in the co-fired fly ash leads to significant expansion of the specimens due to hydrogen production in an alkaline environment. In order to provide a quick identification method for boiler operators or recycling businesses to confirm the hydrogen expansion characteristics of co-fired fly ash, a rapid aluminum content screening test for co-fired fly ash has been established. This test allows effective identification of residual aluminum content in the co-fired fly ash within a 5-minute test period, even if the aluminum content is as low as 0.02%. In addition, to quantify the reactive aluminum content in co-fired fly ash, an aluminum content detection method for co-fired fly ash has been established, choosing 1.0M sodium hydroxide as the detection reagent. This method can effectively detect the presence of aluminum, even if the co-fired fly ash only contains a residual aluminum content of 0.02%. Finally, expansive co-fired fly ash was subjected to wet treatment to produce alkali-activated mortar specimens. It was observed that the specimens no longer exhibited significant expansion, confirming that the wet treatment effectively eliminates the reactive aluminum present in the two types of co-fired fly ash studied.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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