摘要
行政院環境保護署為掌握大型固定污染源空氣污染物排放狀況，推動「連續自動監測設施(CEMS)」，所得監測數據可用於申報空污費及排放量，更可於發生公害糾紛事件時，鑑定污染排放責任，所以連續自動監測數據正確性相當重要。 本文以A、B、C三家設有CEMS的燃煤汽電共生電廠為研究對象，彙整99年至102年煤碳使用量、防制設備操作參數及CEMS數據等資料，並以檢測方式量測SO2和NOx未經防制設備處理的排放量、管道排放量、推估防制設備去除效率、及每噸燃料污染物排放係數。有鑑於過去曾有業者傳送不實的CEMS監測數據，本文彙整了真實數據與不實數據，並針對煤碳使用量與排放數據的相關性及相對準確度測試查核(RATA)的同期數據二方面進行比較分析，應用於檢核CEMS數據的正確性。 研究結果顯示，102年煤碳使用量對排放量的影響較為顯著，與選擇性觸煤還原設備的加藥量(氨水)、污染物排放濃度無顯著相關，分析不實數據傳送期間，結果均無相關性。另透過檢測計算B、C廠SO2排放係數為18.22S及10.36S kg/Ton-煤；NOX排放係數為4.51及7.05 kg/Ton-煤。B、C廠防制設備去除效率以檢測結果計算，SO2分別為97.5 %及91.5 %，NOX為80.8 %及90.4 %。分析102年3廠執行相對準確度測試查核(RATA)當月的同期CEMS數據趨勢，並與98年的不實監測數據進行比較，發現3廠98年在執行RATA時段各測項CEMS的時間變化趨勢，與其他時段明顯不同。由上述結果顯示，可透過燃料使用量和相關污染物排放量相關性分析及RATA數據分析來判定即時監測數據有效性。
並列摘要
In order to manage large stationary emission sources of air pollutants, Taiwan Environmental Protection Administration requires the setup of “Continuous Emission Monitoring System (CEMS)” for collecting air pollution fees and compiling emission inventory. The on-line emission characteristics can further facilitate the forensics of pollution liability when settling down pollution dispute. Therefore, the correctness of the continuous emission monitoring data is important. This study selected three coal-fired cogeneration power plants with the installation of CEMS named A, B, and C for investigation. Data from coal consumption, operating parameters of air pollution control devices (APCD), and CEMS were collected from 2010 to 2013. Meanwhile, SO2 and NOX production and emissions were measured to estimate the removal efficiency of APCD and emission factors of SO2 and NOX per tonne. The objective of this study is to investigate the emission characteristics of SO2 and NOX from coal-fired cogeneration power plants and apply to inspect the correctness of CEMS data. The results showed that the amount of coal consumption was more correlated with the emissions and not the concentrations of pollutants and dosages (ammonia) of selective catalytic reduction (SCR) devices for data in 2013. Therefore, coal consumption can be utilized to judge the correctness of monitoring data. Based on the results of manual sampling before and after APCD, the emission factor of SO2 is 18.22S kg/Ton-coal in plant B with S as the sulfur content of coal and 10.36S kg/Ton-coal in plant C. In contrast, the emission factors of NOX in plant B and C are 4.51 kg/Ton-coal and 7.05 kg/Ton-coal, respectively. And the removal efficiency of flue gas desulfurization device is 97.5 % in plant B and 91.5 % in plant C, while that of SCR is 80.8 % in plant B and 90.4 % in plant C. Additionally, the time variations of CEMS data of plants A, B, and C before illeagal findings in 2009 were different from that of 2013 by comparing Relative Accuracy Test Audit (RATA) data and time variations of CEMS data. It implies that the correlation between fuel consumption and pollutant emissions and RATA data can be used to determine the validity of continuous monitoring data.