本研究之目的為瞭解都市垃圾焚化爐冷啟動過程，煙道廢氣排放多氯聯苯醚(PCDEs)之濃度及特徵。於2011年，本研究針對台灣南部地區一座連續運轉之都市垃圾焚化爐中，3號爐和1號爐進行採樣分析。整個採樣期程，從焚化爐冷啟動開始起算共47小時。3號爐及1號爐分別起爐一次，一次採樣共計15個樣品(A~O)。採樣期程分為三個階段：初期（燃燒室溫度緩慢升至200℃）、中期（燃燒室溫度迅速上升到850℃）及後期（燃燒室溫度穩定保持在1000℃左右）。
研究結果顯示，都市垃圾焚化爐冷啟動時，總PCDEs濃度在起爐8-11小時後，即位於冷啟動中期達到高峰值；此時爐內溫度達到267~440 ℃，位於PCDEs低溫可能再合成之溫度區間(250℃~450℃)。經計算後，估計3號爐和1號爐在冷啟動的47小時內，分別共排放了1.01 mg及3.08 mg的總PCDEs。這種PCDEs大量排放的現象，是由於冷啟動時，溫度經過類似PCDD/Fs之低溫再合成之溫度區間(250℃~450℃)所導致。亦有文獻結果顯示，即使起爐達到穩定燃燒狀態，所排放的總PCDD/Fs濃度仍會因記憶效應偏高，因此推測PCDEs濃度亦受記憶效應影響而偏高；起爐後47小時，3號爐和1號爐煙道總PCDEs濃度分別為0.0383及0.0189 ng/Nm3。上述現象顯示出都市垃圾焚化爐系統中PCDE記憶效應之重要性。3號爐和1號爐於2011年，一整年不含起爐所排放之總PCDEs分別為7.17 mg及7.05 mg。然而，一年中若有一至八次冷啟動，平均所排放之總PCDE佔整年總排放量之比例，分別可達22.3% 至 70.5%。
3號爐和1號爐於2011年一整年，含起爐一次所排放總PCDEs分別為8.2 mg及10.1 mg。然而，若冷啟動次數增加為一年二至八次，則估計所排放之總PCDEs平均增加率分別可達整年總排放量之21.9%至153.6%；換句話說，即每年所排放PCDEs之總量，由22.3上升至46.4 mg。因此如何避免不必要之焚化爐冷啟動，對控制PCDEs之排放非常重要。

The aim of this study is to know the polychlorinated diphenyl ether (PCDE) concentrations and characteristics in the stack flue gas of municipal solid waste incinerators and their continuous emission scenario under cold-start condition. In this study, two incinerators (3 and 1) of a continuously operating MSWI in Taiwan were investigated in 2011. Each incinerator ran the cold start-up one time. Each of the whole sampling periods remain 47 hours after the beginning of cold start-up and fifteen samples were collected (sample A~O). The sampling period was divided into three parts: the initial stage (combustion chamber temperature rose slowly to 200℃) , the middle stage (combustion chamber temperature rose quickly to 850℃), and the final stage (combustion chamber temperature remained steadily at about 1000℃). The result showed that during the cold start of MSWIs, the peak of total PCDE concentration was at the time of 8-11 hours after burner started; which was in the middle stage of the cold-start. At that time, the temperature of combustion chamber reached 267~440℃ and it was in the temperature window (250℃~450℃) of the PCDD/F de novo synthesis. In the incinerator 3 and 1, after careful calculation, the amount of PCDE emission during start-up was estimated to be 1.01 and 3.08 mg, respectively within 47 hrs. During the cold start, the phenomenon of high PCDE emission occurred since the temperature passed through the temperature window (250℃~450℃) of the PCDE de novo synthesis which was similar to PCDD/Fs. The previous study also showed that due to the memory effect, the PCDD/F concentrations, which sampled at a stable combustion condition after start-up, were 2~3 times higher than the mean concentration under normal operational condition. The PCDE concentrations effected by the memory were predictable. The PCDE concentrations were still high (0.0383 and 0.0189 ng/Nm3 in incinerator 3 and 1, respectively) even when 47 hours after the cold start. The above phenomenon demonstrated the significance of PCDE memory effect in the MSWI system. The annual PCDE emission under normal operational conditions excluding the cold-start was 7.17 mg for incinerator 3 and 7.05 mg for incinerator 1 in 2011. However, 1 to 8 times of cold-start can discharge approximately 22.3% to 70.5% of annual total PCDE emission. The amount of annual PCDE emission under normal operational conditions with one cold-start was 8.2 mg for incinerator 3 and 10.1 mg for incinerator 2 in 2011. However, if the cold-start was increased up to 2 and 8 times per year, the increment (%) of total PCDE emission would be elevated up to 21.9% and 153.6%, respectively; in the other word, the average annual PCDE emission rose from 22.3 to 46.4 mg. Therefore, how to avoid unnecessary cold-start is of great importance for controlling PCDE emission in municipal solid waste incinerators.

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