環境資源報告成果查詢系統

排放管道排氣各成分熱值含量調查技術開發

中文摘要 本計畫旨在建立排放管道中排氣熱值之量測技術,用以提供環保署環檢所標準作業之參考依據。針對排放管道排氣熱值分析方法,經評估後使用ASTM D4891燃燒直測熱值方法進行技術開發。燃燒直測法將排放管道氣體導入燃燒腔體,氣體與燃料混合燃燒,測得火焰溫度變化經計算得排放熱值。燃燒直測法系統需1小時穩定間即可連續量測熱值,最重要的零點及全幅校需約 90 秒的時間讀值達到穩定(T90),總時間約需5分鐘。檢量線範圍由甲烷定之,可由甲烷濃度5%-100%所分析的熱值46-1012BTU/ft3,實測結果與理論值比對介於90.91-99.41%之間,誤差範圍小於10%。利用甲烷實驗結果,利用燃燒直測法建立熱值分析方法準確度100.03±1.35%,精密度0.68%。本計畫測試物種乙烯、二甲苯、乙醛、二氯乙烷、硫化氫及氨的熱值理論值與實際值差異均可在誤差範圍20%以內。針對燃燒塔異常排放可能產生高熱值廢氣,本計畫開發之高熱值排氣自動稀釋系統,使用全幅氣體即100%甲烷進行長時間測試平均值1010BTU/ft3標準偏差為24 BTU/ft3,結果顯示落在系統設定準確度為±3%以內。7場次實測分析結果顯示,燃燒直測法所測得的總熱值與層析法連續監測的總熱值均有不錯的正相關,除了文中所探討可能誤差原因需要更進一步釐清外,GC設備監測熱值/燃燒直測法熱值差異均可在20%以內。基於本計畫的研究技術成果,建議環檢所建立燃燒可直測法應用於排放管道的熱值量測,提供石化工業產業標準檢測技術,作為環保署訂定標準作業草案之參考。建議未來可針對石化製程上、中、下游廢氣燃燒塔的成分進行檢測分析探討與GC設備監測熱值差異原因,並建立廢氣燃燒塔廢氣資料庫,比對熱值分析結果和成分分析結果在不同製程、不同成分廢氣燃燒塔的相關性。
中文關鍵字 石化工業;排放管道採樣;熱值

基本資訊

專案計畫編號 EPA-102-1602-02-03 經費年度 102 計畫經費 2450 千元
專案開始日期 2013/03/12 專案結束日期 2013/12/31 專案主持人 杜敬民
主辦單位 環檢所 承辦人 王振興 執行單位 工業技術研究院 綠能與環境研究所

成果下載

類型 檔名 檔案大小 說明
期末報告 1.排放管道排氣各成分熱值含量調查技術開發_期末報告定稿1021220.pdf 5MB

Development of Heating Value Measurement Technology in Stack

英文摘要 The objective of this project was to establish analytical method for heating value in flare stacks for EPA to establish the standard operation procedure. The heating values in flare stacks were measured by stoichiometric combustion method based on ASTM D4891. Stoichiometric combustion method burned the mixture of sample gas, air, and fuel, and then calculated the heating values depending on the temperature variation of combustion. For the stability of the stoichiometric combustion system, one hour warming up time was required before continuous monitoring heating values. Afterwards, ninety-second reading time rule for each calibration points, zero and span, was required for obtaining reliable data, and the total time was about 5 minutes. The standard methane gas (5% to 100%), theoretically resulting in 46 to 1012 BTU/ft3 after combustion, was used to make the calibration curve. The ratios of measured value to theoretical value were between 90.91% to 99.41%, and the error was less than 10%. Based on methane’s experimental results, the accuracy of this analytical method for heating value using stoichiometric combustion method was 100.03±1.35%, and the precision was 0.68%. For all other experimental compounds, including ethylene, xylene, acetaldehyde, 1, 2-dichloroethane, hydrogen sulfide, and ammonia, the errors of the ratio of measured value to theoretical value were all within 20%. As for the high-heating-value waste streams due to abnormal emissions, one auto-dilution system for high-heating-value emissions was developed in this project to handle this abnormal situation. According to our experimental results using the standard calibration gas - 100% methane to simulate the abnormal situation, the measured values were 1010±24 BTU/ft3 and the accuracy of this auto-dilution system was better than 97%. As for field tests, based on our results of 7 sessions, the heating values measured by stoichiometric combustion method and by gas chromatography method had positive correlation. The errors of the ratio of heating values measured by stoichiometric combustion method to by gas chromatography method were within 20%. But the reasons causing the errors need to be further studied in the future. The results of this study suggested that the stoichiometric combustion method could be used for measuring heating values in flare stacks in petroleum plants. Besides, the results of this study could be used to establish standard operation procedure for EPA. To understand the difference of the measured values between by stoichiometric combustion method and by gas chromatography method, the composition of waste streams from different manufacturing processes and different flare stacks must and be studied in the future.
英文關鍵字 Petrochemical Industry;Stack Sampling;Heating value