Using Carbon Gasification for Nitrogen Monoxide Removal from Flue Gas by Zero Valent Iron Fluidized Bed

• Main Authors: Wen-Shi Shiu, 許文熙
• Other Authors: 陳孝行
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/wr8ub2

碩士 === 國立臺北科技大學 === 環境規劃與管理研究所 === 95 === This research uses fluidized column set reaction temperature of zero valent iron and the active carbon powder, to go pass through the experiment, to probe into different reaction temperature, entrance flow concentration and iron powder / carbon powder quantity. Also, this research stimulates the influential factors such as the flue gas under different oxygen concentration and influential nature towards carbon gasification produced CO and NO in the elimination of exhaust gas; obtains the unit iron powder NO elimination quantity of the fluidized bed at different reaction temperature; Simultaneously, through experimenting the XRD examination discusses its possible reaction mechanism. In the temperature effect aspect, when [NO] inlet = 240ppmv, Fe=0.5g, C= 0.5g, and flux is 0.3 L/cm2．min, NO removal efficiency of reaction temperature 573K has almost no effect. At 623 K, NO removal efficiency avg.≒39.7% and at about 12% O2 reacted efficiency. At 673K, 723 K, 773 K, when [NO] = 50ppmv breakthrough point, ZVI treatment ability are at 1.56mg NO/g Fe, 6.53 mg NO/g, and 7.89 mg NO/g Fe， when [NO] = 75ppmv breakthrough point, ZVI treatment ability are at 6.24mg NO/g Fe, 7.63 mg NO/g, and 8.63 mg NO/g Fe. It is shown under these temperature ranges, NO removal efficiency and the ZVI treatment ability increases along with the raise of the reaction temperature. In the entrance flow concentration effect, as to the changes of NO entrance flow concentration 240ppm, there are at least three times the tolerance ability that will not create damages or losses to the existing elimination ability. At 0.6, 0.7, 0.8 L/cm2．min, NO breakthrough time decreases as the flux increases. NO breakthrough time is obviously influenced by the carbon powder quantity. When iron powder quantity is fixed and when the carbon powder quantity increases, they are positively correlated to the NO breakthrough time. Its ZVI treatment ability (as mg NO/g Fe) increases along with the carbon quantity increase in proportion. The flue gas consisting oxygen concentration has influences over NO reduction. The increase in oxygen concentration in the flue gas obviously decreases the NO removal ability. Under the environment of high-temperature and low oxygen, solid carbon gasified to provide reducing agent CO. Using CO for reduction of NO by ZVI fluidized bed. In these studies, both higher temperature and more carbon weight can achieve higher the capacity of ZVI for De-NO. XRD (X-Ray powder Diffraction) were conducted to analyze the crystal structure and oxidation state of the reacted powders. Several species were determined from the spectrum：C,Fe0(ZVI),FeO•Fe2O3 and Fe3O4.