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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/66006

    Title: 都市垃圾焚化爐廢氣處理系統除酸功能穩定度提升之研究;Study on enhancing the stability of acid gas removal efficiency for the flue gas treatment system of municipal solid waste incinerator
    Authors: 徐洪陞;HSU,HUNG-SHENG
    Contributors: 環境工程研究所在職專班
    Keywords: 垃圾焚化爐;廢氣處理系統;半乾式洗煙塔;酸性氣體;去除效率;Waste incinerator;Flue gas treatment system;Semi-dry scrubber;Acid gas;Removal efficiency
    Date: 2014-07-08
    Issue Date: 2014-10-15 17:21:20 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 近年來一般家戶垃圾的收集量顯著的減少,使得在台灣的大型都市垃圾焚化爐,具有餘裕處理一般事業廢棄物,但由於進入焚化爐的垃圾性質和組成,產生極大的變化,使得酸性氣體污染物的排放濃度,經常發生起伏變化的情形。本研究為了瞭解酸性氣體控制設施之操作的穩定度,以台灣北部地區某大型都市垃圾焚化爐,採用半乾式洗煙塔去除廢氣中酸性氣體,做為實廠研究對象,藉以探討各項操作變數,包括化學藥劑種類、反應溫度及化學藥劑計量比,對於酸性氣體去除效率的影響,並以情境模擬實驗,了解維持廢氣處理系統穩定度的策略。
    ;In recent year, the collected amounts of the general household solid wastes decreased significantly, thus the large municipal solid waste incinerators (MSWI) in Taiwan have headroom capacity to handle the general industrial solid waste. Consequently, due to the great changes in nature and composition of the solid wastes into MSWI, the emission concentration of acid gas pollutants with high fluctuating conditions was occurred frequently. In order to realize the stability of the facility for controlling the acid gas pollutants, a full scale of MSWI in northern Taiwan, using semi-dry scrubbers to remove acid pollutants in the flue gas, was employed in this study. The effects of the operating variables, include type of chemicals, reaction temperature and stoichiometric ratio of chemical, on the removal efficiency of acid gas pollutants were investigated. Scenario simulation experiments were also carried out to understand the strategies for maintaining stability of the flue gas control system.
    The results shown that when the flue gas at the temperature of 150 ℃ and using hydrate lime and sodium hydroxide as chemical agent at the stoichiometric ratio of excess dosing was 2.4 and 1.6, respectively, the HCl acid gas removal efficiency were both of over 96% and the SOx removal efficiency was above 86% and 78%, respectively. However, the increase of temperature of the flue gas, the HCI and SOx acid gas removal efficiency was gradually decreased. It also found that when the temperature of the flue gas increased to 210 ℃, only bicarbonate sodium at the stoichiometric chemical dosing ratio of 1.6, the HCl and SOx acid gas removal efficiency could be maintained above 96% and 85%, respectively.
    In addition, the strategies for maintaining stability of the acid gas control system, the result of this study indicated that adding an extra cooling water spray system to control the temperature of flue gas approximately between 140 ~ 150 ℃ if at the necessary. So that the best acid gas removal efficiency could be obtained at the lowest stoichiometric dosing ratio of hydrate lime. Establish a new dry hydrated lime spray system for supplying the extra hydrate lime to enhance the removal efficiency of acid gases, when the exhaust gas emission concentration of acid gases suddenly changes. Besides, use crane to blend all kinds of solid wastes in the refuse bunker in order to make the nature of the feed into the waste incinerator maintaining at a uniform steady state at all operation time.
    Appears in Collections:[環境工程研究所碩士在職專班] 博碩士論文

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