博碩士論文 92336015 詳細資訊




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姓名 廖其貴(Chi-Kuei LIAO)  查詢紙本館藏   畢業系所 環境工程研究所在職專班
論文名稱 Dry Scrubber 吸收技術去除毒性氣體之研究(半導體低壓化學氣相沈積製程為例)
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摘要(中) 本研究以現有不同乾式化學吸收技術(Dry scrubber),對低壓化學氣相沉積製程(Chemical Vapor Deposition LPCVD)尾氣排放毒性氣體處理的效果,並分析不同吸收劑及吸附劑處理效率及副產物,以及三種不同處理設備的經濟成本評估。
實驗結果顯示:LPCVD製程尾氣經霍氏轉換紅外光(Fourier Transform Infrared Spectroscopy FTIR),其尾氣成份主要是SiF4、HCl、HF、及CO,經由三種不同吸收、吸附劑(AC、AC-OH及FeOOH)對前端氣體之去除效率皆>99%,FeOOH吸收劑所產生的副產品分析濃度為N.D。
摘要(英) Semiconductor and TFT-LCD processes use a significant amount of special gases. Most of these special gases are halogenated acid gases, e.g., Cl2, HCl, ClF3, and HBr, etc… The special gases are toxic to human and cause corrosion on pipes and process tools. Major treatment processes for those gases are wet scrubbing, burn + wet scrubbing and dry scrubbing processes. However, some gases have low solubility in water and burn process could cause fire hazard and consume significant energy. Semiconductor Industry Association recommends the dry local scrubber for CVD cleaning and etching as well as ion implantation. The objective of this study was to investigate the treatment ability of toxic gases from semiconductor processes by dry local scrubbers. Low pressure chemical vapor deposition process (LPCVD) was the primary target of this study and the ClF3 is used as the cleaning gas for wafer.
Three dry local scrubbers were studied, including the regular activated carbon, activated carbon coated with NaOH and CaOH, and FeOOH catalyst. A FTIR was used to detect the target gas and byproducts from the LPCVD process as well as the byproducts after the dry local scrubbers. Results showed that the major gases from the LPCVD process are SiF4, HCl, HF and CO. ClF3 was consumed during the process. Those gases were removed by the three types of dry scrubbers with efficiency higher than 99%. However, CFCs (chlorination fluorinated carbons) and methanol were detected in the effluent gases of the two activated carbons of local scrubbers, but negligible for FeOOH. Cost comparison of the three dry scrubbers showed the waste treatment cost are major problems for the dry scrubbers. The FeOOH can be recycled locally and therefore, the operation cost of the FeOOH was lowest.
Based on these observation, it were concluded the dry local scrubbers are high efficiency, and have low maintenance, no wastewater and toxic gases and low risk on fire hazard on special gas treatment. However, the activated carbon type of local scrubber can produce significant amount of by-products and waste treatment is major problem. The FeOOH type local scrubber can overcome those problems.
關鍵字(中) 關鍵字(英) ★ Dry scrubber
★ LPCVD
★ AC
★ AC-OH
★ FeOOH
論文目次 第一章 前言 1
1-1 研究緣起 1
1-2 研究目的 8
第二章 文獻回顧 10
2-1 現有之減量技術 10
2-1.1 Dry scrubber(乾式化學吸收技術) 10
2-1.2 Hot chemical bed/wet scrubbing(觸媒焚化後洗滌技術) 11
2-1.3 thermal(burn)/wet scrubbing(高溫焚化後洗滌技術) 11
2-1.4 Wet scrubbing(濕式氧化洗滌技術) 13
2-2 現有PFC之減量技術 16
2-3 管末處理技術 16
第三章 研究方法及工作實施方法 19
3.1 工作實施方法 19
3.2 美國環保署TEST METHOD 320 21
3.2-1 簡介 22
3.2-1.1範圍及適用性(applicability) 22
3.2-1.2 方法範圍及靈敏度(sensitivity) 22
3.2-2 方法概要 22
3.2-2.1 原理(principle) 22
3.2-2.2 採樣及分析(Sampling and Analysis) 23
3.2-2.3 標準圖譜(reference spectra) 23
3.2-2.4 操作要求 23
3-2.3 定義 23
3-2.4 干擾(interferences) 24
3-2.4.1分析干擾 24
3-2.4.2採樣系統干擾 24
3-2.5 安全 24
3-2.6 設備與零件 25
第四章 結果與討論 26
4-1 廢氣成分及相關濃度分析結果 26
4-2 不同吸收劑及吸附劑處理的分析 32
4-2.1 尾氣經不同吸收劑及吸附劑處理後的副產品 33
4-3 經濟性之評估 36
第五章 結論與建議 38
5-1 結論 38
5-2 建議 38
參考文獻 40
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指導教授 王鯤生(Kuen-Sheng Wang) 審核日期 2005-7-25
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