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題 名 | 大林電廠一、二機組燃用相同煤質產生不同運轉結果研究=Study on the Performance Discrepancies between #1 and #2 Units of Ta-Lin Power Station |
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作 者 | 江滄柳; 賴維祥; 姜巍棠; 李俊明; 李聰盛; 劉軒誠; 林昌宏; 梁丁發; 李國楨; | 書刊名 | 台電工程月刊 |
卷 期 | 630 2001.02[民90.02] |
頁 次 | 頁10-31 |
分類號 | 448.14 |
關鍵詞 | 電廠; 氮氧化物排放; 燒失量; 渦流結構; Power plant; NOx emission; Unburned carbon; Vortex structure; |
語 文 | 中文(Chinese) |
中文摘要 | 本文益現場量測、實驗模擬觀察與電腦睥值模擬等方式研探討臺電舒鉰大林火力發 電廠1、2號機組雖皮用相同煤質然料,但然燒所產生的氮氧化物及燒失量均有相當差異之原 並提供且體建議,以降低兩部機組氮氧化物及燒失量,進而改善鍋爐效率。 由實驗結果得知,當模型四角落之進氣入口數目相同時,發現雷射切面中央出現渦流現 象,當四角落之進氣量不平均時,渦流將不易辨識,亦即空氣進氣量不平均時將導致渦流結 構變弱。此外,模型底部隙縫會造成模型內氣流之不穩定,其渦流結構也有變弱的現象。 根據現場量測及資料收集之結果獲知:在相同之飼煤率之下,2號機之空然比較低且其 褣氣溫度較高。而且,經數值模擬研究證實,較低之過量進口氣會造成2號機之然燒及?氣 溫度皆較高,同亦會泄生較多量之氮氧化物。由於進氣溫度主要受燃氣溫度影響,而燃氣溫 度又為過量進口空氣量之多寡所決定,因此,過量進口空氣現量之多寡應為造成二部機組? 燒發生差異之主要原因。 |
英文摘要 | The performance discrepancies in Nox emission and unburned carbon in ash between #1 and #2 units of Ta-Lin Power Station using the coal of equivalent quality have been investigated by local spot measurement, experimental simulations and numerical simulations. Recommendations for the reduction of Nox emission and unburned carbon in ash well as the improvement of boiler efficiency have been proposed in this study. The results obtained from the flow observation of the boiler model show that the central vortex occurs as the flow rates are equivalent at the four inlet corners. The strength of the vortex becomes weaker if the discrepancies in flow rates at the four inlet corners are significant. Moreover, the air leakage on the bottom of the model causes the instability of the internal flow, resulting in a weaker vortex structure. On site of Tai-Lin Power Station, it has been found that under equivalent coal feeding rates, the inlet air flow-rate and temperature of #2 unit are apparently lower and higher, respectively, than those of #1 unit. As confirmed by numerical simulations, these discrepancies lead to higher combustion temperature, exhausted gas temperature, and Nox emission of #2 unit. Since the inlet are temperature is heated by the exhausted gas through the air hearter, the lower inlet air temperature is heated by the exhausted gas through the air heater, the lower inlet air flow-rate of #2 unit is conceived as the main factor responsible for the performance discrepancies in Nox emission and unburned carbon in ash between #1 and #2 units of Ta-Lin Power Station. |
本系統中英文摘要資訊取自各篇刊載內容。