Removal of dioxins and related aromatic hydrocarbons from flue gas streams by adsorption and catalytic destruction |
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| Authors: | Liljelind P Unsworth J Maaskant O Marklund S |
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| Institution: | 1. Environmental Chemistry, Chemistry Department, Umeå University, SE-902 87 Umeå, Sweden;2. Fuels Business Group, Shell Global Solutions, Shell Research and Technology Centre, Thornton, P.O. Box 1, Chester CH1 3SH, UK;3. CRI Technology Services BV, Koninginnegracht 23, 2514AB The Hague, Netherlands;1. Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China;2. Aviation Electromechanical System Integration of Aviation Science and Technology Key Laboratory, Nanjing 211106, People’s Republic of China;1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, PR China;2. Beijing Construction Engineering Group Environmental Remediation Co., Ltd, Beijing, PR China;1. Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China |
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| Abstract: | The dioxin removing capacity of the shell dedioxin system (SDDS – a Ti/V oxidative type catalyst) has been tested using the Umeå lab-scale incinerator over the temperature range 100–230°C and at space velocities of 8000 and 40,000 h−1. Other analogous organic compounds, such as PCBs, PAHs, chlorobenzenes and chlorophenols have also been investigated. Results show a high degree of dioxin removal already at 100°C (82%), which occurs mainly by adsorption. When the temperature is raised a transition towards destruction is seen and at 150°C, gas hour space velocity (GHSV) 8000 and at 230°C, GHSV 40,000 virtually all removal is by destruction. High PCDD/F destruction efficiencies are reported (>99.9%, based on I-TEQ); the other dioxin-related species and PAHs are also removed and destroyed to a significant extent. The SDDS has proved to be an effective means of destroying organic compounds in the gas phase, particularly dioxins, at temperatures as low as 150°C. |
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