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題 名 | Evaluation of Fuel Co-Firing Technique and Its Applications to Fossil Fuel Fired Power Boilers=燃料混燒技術及其在火力發電應用上之探討 |
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作 者 | 陳石麟; 林瑞繁; 張進發; 顧宏基; 陸仲才; 林昌宏; 陳景林; 李國楨; | 書刊名 | 台電工程月刊 |
卷 期 | 607 1999.03[民88.03] |
頁 次 | 頁1-16 |
分類號 | 448.14 |
關鍵詞 | 飛灰未燃碳; 氮氧化物; 燃料共燒; 電腦模擬; Carbon-in-ash; Nitrogen oxides; NOx; Fuel co-firing; Computer simulation; |
語 文 | 英文(English) |
中文摘要 | 本研究以燃燒專用軟體(GLACIER)為工具,針對現場之需求進行電腦模擬分析,評 估鍋鑪操作條件及燃料共燒對鍋爐性能之影響,同時顯示此技術對解決燃燒、熱傳及污染等 相關問題之功能。電腦模擬對象包括臺中四號機、興達一號機及大林六號機等三座鍋鑪,研 究的重點是分析操作模式、粉煤共燒、油、氣共燒及低NOx控制設備對爐內燃氣溫度、流場 分佈、NOx排放、及飛灰未燃碳含量之影響。 電腦模擬研究結果顯示,BOOS(燃燒器停用)位置影響火燄形狀、爐內溫度及流場分佈 ,同時影響NOx排放及飛灰未燃碳含量。模擬假設所有燃燒器以相同之煤及空氣量燃燒,但 各燃燒器所顯示之燃燒效率並不相同,其中以底層燃燒器之燃燒效率最高。OFA(火上風) 降低NOx排放,但增加飛灰未燃碳含量。 粉煤共燒之結果視機組及煤炭之特性而定,煤炭之含灰量影響飛灰之未燃碳含量。共燒 時底層燃燒器燒反應度最差之煤炭,可以增長煤粒在爐膛之滯留時間。降低粉煤細度,不一 定能降低未燃碳含量。燃氣鍋爐模擬結果指出,FGR(煙氣迴流)降低火燄溫度,有效控制天 然氣Thermal NOx之形成,降低NOx排放。油、氣共燒時,六號油放在前牆底層或後牆底層所 產生之NOx與全燒氣時類似。 |
英文摘要 | A reacting CFD code, called GLACIER was used to demonstrate its capability in solving combustion and heat transfer related problems in fossil fuel fired power boilers. Three Taipower boilers were selected for the study: Taichung Unit 4, Hsinta Unit 1 and Talin Unit 6. The simulations were focused on several operational practices currently employed at Taipower, including burners out of service (BOOS), overfire air (OFA), flue gas recirculation (FGR), coal co-firing, and gas and oil co-firing. The model input data were based on the furnace design information, fuel properties and boiler operation conditions. The simulation results indicated that BOOS affected the flame patterns and the flow fields in the furnace, While the NOx emissions ad the amounts of unburned carbon in fly ash were dependent upon specific BOOS configuration. All burners were not equal in their contributions to the total carbon-in-ash. Among them, bottom row burners consistently yielded the lowest carbon-in-ash. In addition, OFA reduced NOx but increases unburned carbon. The result of co-firing different coals through differet burner rows was system as well as coal dependent. Co-firing different coals affected the total carbon-in-ash but the actual overall burnout may not change depending upon the overall ash content of the fuel. It would be more beneficial to fire the least reactive coal through the lowest burner row so that longer residence time would be available for these coal particles. However, finer grinding to eliminate the largest coal particle sizes might not be effective in improving burnout. Simulation of the gas fired boiler showed that FGR is very effective in controlling the NOx emissions. Co-firing 20 percent No. 6 oil with 80 percent natural gas has minimal impacts on the NOx emissions from the gas fired boiler. |
本系統中英文摘要資訊取自各篇刊載內容。