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題名 | 臺中電廠選擇性還原脫硝觸媒再生可行性評估=Evaluation Study for SCR Catalysts Regeneration of Taichung Power Plant |
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作者 | 廖逸飛; 島田裕; 張玉金; Liao, Yi-fei; Shimada, Hiroshi; Chang, Yu-ching; |
期刊 | 台電工程月刊 |
出版日期 | 20060400 |
卷期 | 692 民95.04 |
頁次 | 頁45-61 |
分類號 | 448.13 |
語文 | chi |
關鍵詞 | 觸媒再生; 脫硝; 清洗; 補塗; 磨光; Catalyst regenration; Denitrification; Washing; Recoating; Polishing; |
中文摘要 | 本研究之目的在於深入調查並了解臺中發電廠現有選擇性還原脫硝觸媒的劣化情形,進一步了解其劣化因素,並依其劣化因素評估選擇出最適當的觸媒再生方法。此外,亦研究臺中發電廠脫硝設備與觸媒目前的運轉情形及作為未來運轉方式的改善。 研究結果發現,因煤灰覆蓋觸媒表面,使臺中發電廠觸媒劣化;再者,於觸媒反應器內部,接近反應器入口處觸媒劣化越嚴重。透過分析發現,觸媒表面幾乎偵測不出TiO₂,此證明觸媒表面煤灰覆蓋較嚴重。另外,本研究推測,煤灰中的鈣成分和煙氣裡的SO₂(或SO₃)在觸媒表面或裏層形成硫酸鈣,並造成觸媒性能劣化。關於臺中發電廠8號機脫硝裝備的性能,本研究估計目前的觸媒依然有效。但由於煤灰沉積,致煙器的路徑變窄及觸媒反應降低,依此事實觀之,需要相當注意脫硝設備的性能。據此,建議在SCR反應器入口和出口量測煙氣,以釐清脫硝設備的真實性能。 本研究證實以清洗、補塗和磨光等方法均可以恢復性能,至於各方法性能恢復的程度,若磨光能將觸媒表面結垢完全去除則以磨光最佳;如果觸媒表面黏著及累積的煤灰在SO₂氧化率可接受的情況下,以補塗次佳。然所有方法中,清洗方法有較簡便,且不會減少觸媒體積或改變組成等優點,對需要恢復觸媒性能的場合最為有效。故在考量到臺中發電廠觸媒之情況,本研究認為以組合式再生法較為適合。 |
英文摘要 | In the examinations ever executed, as coal ash covered the catalyst surface, the performance of catalyst in Taichung Power Plant deteriorated. Furthermore in a plate of catalyst, the closer it is to the gas inlet, the worse the deterioration is. On the contrary, the closer it is to the outlet, the better the performance is. As a result of the analysis of catalyst surface, TiO₂, a component of catalyst support, hasn't been detected on the catalyst surface. It proved that the surface had been exceedingly covered with coal ash. On the basis of the assessment of correlation between NOx removal efficiency and the masking component, we estimate that the deterioration factor should be a kind of reaction resistance caused by Gypsum, which is generated as a compound of Calcium in the coal ash and SO₂ (or SO₃) that spreads on or in the catalyst from the exhaust gas. As for the performance of the denitrification equipment in Unit 8 of Taichung Power Plant, we estimated that the catalyst still survived in the capacity of performance. Nonetheless, as ash deposition occurred, the gas passageway narrowed and the area of catalyst reaction decreased. And the performance of the denitrification equipment is in a significantly servere condition. Moreover, in order to clarify the actual performance of the equipment, the exhaust gas measurement be conducted at both inlet and outlet of SCR reactor is recommended. Through the regeneration test, we have confirmed that the performance could be restored with water washing, recoating and polishing. Among different regeneration methods, although recoating showed a higher performance recovery rate, we are still concerned that sulfating may cause rapid performance decline due to the increase of SO₂ oxidation ratio and the subsequent recoating on the coal ash adhered on catalyst surface. However, compared with other methods, although water washing resulted in the same or even lower rate of performance recovery, it has the advantages such as no change of catalyst volume and catalyst component takes place so that multiple regenerations become possible. Accordingly, in consideration of the catalyst condition in Taichung Power Plant, it is better to carry out a kind of combined regeneration, and for example, at first to do washing with water, then to perform polishing following the aggravation of contamination on catalyst surface. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。