Pyrolysis of tire powder: influence of operation variables on the composition and yields of gaseous product |
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| Affiliation: | 1. Department of Mechanical Engineering, The University of Hong Kong, 7/F Haking Wong Building, Pokfulam Road, Hong Kong, China;2. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, 81 Xianlie Zhong Rd., Guangzhou 510070, China;1. Grupo de Investigaciones Ambientales (GIA), Universidad Pontificia Bolivariana (UPB), Circular 1 N° 74-50, Medellín, Colombia;2. Instituto de Carboquímica (ICB-CSIC), Miguel Luesma Castán 4, 50018 Zaragoza, Spain;1. School of Environmental Science & Technology, Dalian University of Technology, Dalian, 116024, Liaoning, China;2. Guangzhou Environmental Protection Investment Group, Guangzhou, 510000, Guangdong, China;1. State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, PR China;2. China-EU Institute for Clean and Renewable Energy at Huazhong University of Science and Technology, Wuhan, 430074, Hubei, PR China;3. Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, PR China;1. Laboratory of Energy, Mechanical and Engineering, Faculty of Engineering Sciences, University of M''hamed Bougara (UMBB), Independance Avenue, 35000 Boumerdes, Algeria;2. GEPEA, UMR 6144, Department of Energy Systems and Environment, Ecole des Mines de Nantes, 04 rue Alfred Kastler, BP 20722 F-44307 Nantes Cedex 3, France |
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| Abstract: | The pyrolysis of tire powder was studied experimentally using a specially designed pyrolyzer with high heating rates. The composition and yield of the derived gases and distribution of the pyrolyzed product were determined at temperatures between 500 and 1000 °C under different gas phase residence times. It is found that the gas yield goes up while the char and tar yield decrease with increasing temperature. The gaseous product mainly consists of H2, CO, CO2, H2S and hydrocarbons such as CH4, C2H4, C2H6, C3H6, C3H8, C4H8 and C4H6 with a little other hydrocarbon gases. Its heating value is in the range of 20 to 37 MJ/Nm3. Maximum heating value is achieved at a temperature between 700 and 800 °C. The product distribution ratio of gas, tar and char is about 21:44:35 at 800 °C. The gas yield increases with increasing gas residence time when temperature of the residence zone is higher than 700 °C. The gas heating value shows the opposite trend when the temperature is higher than 800 °C. Calcined dolomite and limestone were used to explore their effect on pyrolyzed product distribution and composition of the gaseous product. It is found that both of them affect the product distribution, but the effect on tar cracking is not obvious when the temperature is lower than 900 °C. It is also found that H2S can be absorbed effectively by using either of them. About 57% sulfur is retained in the char and 6% in the gas phase. The results indicated that high-energy recovery could not be achieved if fuel gas is the only target product. In view of this, multi-use of the pyrolyzed product is highly recommended. |
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