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研究生:曾映棠
研究生(外文):Ying-Tang Tseng
論文名稱:化學溶劑吸收再生法回收廢氣中二氧化碳之溶劑使用成本分析
論文名稱(外文):Analyses on Solvent Utilization Costs for Carbon Dioxide Recovery from Flue Gas by Chemical Solvent Methods
指導教授:白曛綾
指導教授(外文):Hsunlin Bai
學位類別:碩士
校院名稱:國立交通大學
系所名稱:環境工程所
學門:工程學門
學類:環境工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:90
中文關鍵詞:溶劑使用成本再生熱化學溶劑吸收法
外文關鍵詞:solvent utilization costsheat of regenerationchemical absorption method
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本研究針對處理廢氣中二氧化碳所使用的各種醇胺溶劑之溶劑使用成本分析,研究考慮溶劑消耗成本及再生熱成本,並假設SOx濃度對溶劑之二氧化碳去除效率影響很小。
研究結果顯示,影響二氧化碳吸收溶劑成本之關鍵因子以SOx濃度的影響最大,其也影響最佳溶劑之選擇;其次為再生熱能成本,尤其是在低SOx濃度下,再生熱能佔整個溶劑使用成本的比例最大,惟其值只隨溶劑之組成不同才有所改變。當SOx濃度高(如500 ppm)時,30%MEA為最具經濟效益之醇胺溶劑,其溶劑使用成本為1.97 kTWD/tonne-CO2,此時之去除率約95%;若SOx濃度在54ppm以下時,則溶劑受SOx毒化之影響較不顯著,此時使用18%MEA+12%AMP應較為經濟;而SOx濃度若能降低至10ppm時,則18%MEA+12%AMP之溶劑使用成本可降低至0.87 kTWD/tonne-CO2,此時之去除率約90%。因此廢氣之淨化前處理效果將為決定最佳醇胺溶劑,以降低分離回收二氧化碳成本之主要影響關鍵。
此外本研究亦進行非醇胺溶劑之溶劑使用成本評估,由於NaOH-CaO再生法及氨水再生法不受SOx濃度所影響,又加上價格低廉,使NaOH-CaO再生法之溶劑使用成本可低至0.9 kTWD/tonne-CO2,而氨水再生法之溶劑使用成本可低至0.5~0.72 kTWD/tonne-CO2,因此以非醇胺溶劑來回收煙道氣中二氧化碳具有相當高之應用潛力。但本研究係採用非醇胺之理論熱能損耗來得到溶劑使用成本,因此未來研究需探討實際之再生熱損耗,以了解其實際應用價值。
This study aimed at solvent utilization costs by chemical absorption of carbon dioxide recovery from flue gas. Both of the solvent consumption costs and the heat of regeneration costs are principal items to affect solvent utilization costs. The costs are estimated based on the assumption that influence of SOx concentration (under 500 ppm) on CO2 removal efficiency are negligible.
The results show that the concentration of SOx, the solvent purchase price, and the L/G ratio are the major factors influence the solvent utilization costs. Using 30%MEA as the chemical solvent appears to be the most economical amine at high SOx concentration (as 500 ppm), it’s solvent utilization costs is 1.97 kTWD /metricton-CO2 at removal efficiency of about 95%. When the SOx concentration is lower than around 54 ppm, the solvent consumption by SOx poison is less significance and 18%MEA+12%AMP appears to be more economical than 30%MEA. If SOx concentration can be reduced to 10 ppm, the solvent utilization costs of 18%MEA+12%AMP can be reduced to 0.87 kTWD/metricton-CO2, at 90% CO2 removal efficiency. Therefore, the best amine solvent will be determined by the pretreatment of flue gases to remove SOx and other gases that may poison the chemical solvent.
The solvent utilization costs of non-amine solvent is estimated in this study also. Due to NaOH-CaO and ammonia regeneration methods are not affected by SOx concentration, and they have cheaper purchase prices, the solvent utilization costs can be lower to 0.9 kTWD/metricton-CO2 for NaOH-CaO solvents,and 0.5~0.72 kTWD/metricton-CO2 for ammonia solvent. So non-amine solvents have high potential to replace amine solvent on recovery from CO2 of flue gas. But it needs to confirm their field applications.
目錄 i
表目錄 iii
圖目錄 iv
符號說明 vii
第一章 前言 1
1.1 研究源起 1
1.2 研究目的 2
第二章 文獻回顧 3
2.1 吸收法簡介 3
2.2 二氧化碳分離回收系統介紹 4
2.3 醇胺之分類及其特性 5
2.4 醇胺損失因子 9
2.4.1 毒化損失 10
2.4.2 揮發損失 10
2.5 醇胺溶劑之相關文獻 10
2.6 成本評估之文獻 12
2.7 非醇胺吸收劑之介紹 13
2.7.1 氫氧化鈉-氧化鈣 13
2.7.2 氨水 14
第三章 研究方法 17
3.1建立成本評估流程 17
3.1.1相關資料收集 17
3.1.2本研究之假設條件 18
3.1.3損耗率之估算 18
3.1.4移除每公噸二氧化碳之溶劑消耗成本 19
3.1.5再生熱能消耗之成本估算 20
3.2影響溶劑使用成本之關鍵因子分析 21
3.3 評估各種吸收劑之溶劑使用成本效益 21
3.4 非醇胺溶液之溶劑使用成本評估 21
3.4.1 NaOH-CaO之溶劑使用成本評估 21
3.4.2 氨水之溶劑使用成本評估 23
第四章 結果與討論 25
4.1 影響醇胺成本之關鍵因子分析-以MEA為例 25
4.1.1 醇胺揮發之影響 25
4.1.2 液氣比之影響 26
4.1.3 SOx濃度的影響 26
4.1.4 醇胺價格之影響 26
4.1.5 再生熱之影響 27
4.1.6 研究小結 27
4.2 18%MEA+12%AMP與30%MEA比較 27
4.3 其他醇胺之CO2溶劑使用成本比較 29
4.3.1 SOx濃度對各醇胺去除CO2之溶劑使用成本比較 29
4.3.2 與30%MEA等溶劑使用成本之醇胺購買價格評估 31
4.4 非醇胺溶劑之溶劑使用成本 32
4.4.1 NaOH-CaO之溶劑使用成本 32
4.4.2 氨水之溶劑使用成本 34
4.5 醇胺溶劑與非醇胺溶劑之溶劑使用成本比較 35
4.6 與文獻中之成本分析資料比較 35
第五章 結論與建議 37
5.1 結論 37
5.2 建議 38
參考文獻 40
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