利用旋轉填充床進行化學氧化吸收去除氮氧化物之性能評估

Performance Evaluation of Nitrogen Oxides Removal Using Chemical Oxidation and Absorption via a Rotating Packed Bed

洪振耀(Chen-Yao Hong)

指導教授 ： 蔣本基

共同指導教授 ： 潘述元(Shu-Yuan Pan)

國立臺灣大學/工學院/環境工程學研究所/碩士(2021年)

https://doi.org/10.6342/NTU202102462

摘要

自工業革命以來，科技與經濟活動蓬勃發展，大幅的改善與提高的人們的生活品質，然而伴隨著空氣污染物的排放，過去易被忽略的環境與生態問題也逐一浮現，其中，氮氧化物為指標性空氣污染物之一，對於環境與人體的傷害日益受到重視，政府部門所訂定的氮氧化物排放標準逐漸加嚴，也使科學家開始發展更有效率的氮氧化物去除技術。應用超重力旋轉床去除氮氧化物為相當具有潛力的空氣污染控制技術，透過離心力使反應器內產生高質傳的特性，可於一般常溫下操作，也大幅縮減傳統氧化吸收的濕式洗滌法所需要的設備體積。
本研究為利用超重力旋轉填充床進行化學氧化吸收程序去除氮氧化物，過程中包含測試各式氣相與液相藥劑、旋轉床操作條件與高中低濃度污染物負荷於氧化吸收程序中的去除效率。研究結果顯示以一氧化氮為主要成分 ((NO)⁄(NO_X≈0.9)) ，總濃度為200 ppm的氮氧化物，於氣液比20、超重力因子86、氣相氧化劑為二氧化氯與液相吸收劑為亞硫酸鈉的操作條件下，氮氧化物的總去除率達98.99 %；當污染物濃度提高至750 ppm時，以相同的操作條件，氮氧化物的總去除率仍可維持在98 %以上，且尾氣濃度也符合法規排放標準。此外，本研究中也對系統質傳係數進行因次分析，並建立相關的數學模式；另一方面，為了考量此技術於未來實務操作的可能性，對系統進行簡易的能耗評估與成本分析。期盼透過本研究的模組實驗、數學模式與能耗成本分析，提高此技術於實廠中應用的可行性。

關鍵字

氮氧化物控制技術 ； 超重力技術 ； 旋轉填充床 ； 氧化吸收程序 ； 質量傳輸 ； 成本分析

並列摘要

Since the industrial revolution, technological and economic activities have developed vigorously, which greatly improves people's quality of life. However, with the emission of air pollutants, environmental and ecological problems that were easily overlooked in the past have gradually emerged. Among them, more and more people are concerned about the harm of nitrogen oxides to the human body and the environment. Besides that, nitrogen oxide emission standards set by government agencies are becoming stricter. Therefore, scientists have started to develop more efficient technologies for removing nitrogen oxides. Using a high-gravity rotating bed to remove nitrogen oxides is a potential technology for air pollution control. The centrifugal force creates high mass transfer properties in the reactor. It can operate at normal temperature and greatly reduces the volume required for traditional wet scrubbing of oxidation absorption. ‒
This study uses the rotating packed bed to perform a chemical oxidation absorption process to remove nitrogen oxides. The method includes testing various gas and liquid phase agents, rotating bed operating conditions, and removing high, medium and low concentration pollutants in the oxidation absorption process. The research shows that when using nitrogen oxides with a total concentration of 200 ppm ((NO)⁄(NO_X≈0.9)) as the pollutant source, the overall removal efficiency of nitrogen oxides reaches 98.99% under the best operating conditions (gas-liquid ratio of 20, high gravity factor of 86, chlorine dioxide as a gas phase agent and sodium sulfite as a liquid phase agent); if the pollutant concentration has been increased to 750 ppm, the total degree of separation of nitrogen oxides can still be kept above 98% under the same operating conditions, and the exhaust gas concentration also corresponds to the legal emission standards. In addition, the dimensional analysis of the mass transfer in the system, the estimation of the mass transfer coefficient and the associated prediction models were established in this study; In the practical implementation, a simple cost analysis of the system was carried out. By simulating module experiments, establishing mathematical models and evaluating economic efficiency, this technology should be more realistic in the future.

並列關鍵字

NOX control technology ； High-gravity technology (HiGee) ； Rotating packed bed ； Oxidation-absorption process ； Mass transfer ； Cost analysis

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