Abstract
In order to clarify the thermal decomposition behavior of typical solid wastes (urethane RDF, wood chips and rubber chips), pyrolysis experiments were performed under two isothermal conditions, which are 500°C and 600°C respectively, employing a bench scale facility. Effects of steam injection were also investigated at the temperature of 600°C. The time change of the pyrolysis gas composition was measured continuously and the total weight of generated tar components and char were measured. Based on these measurements, mass and energy balances of pyrolysis products were determined. The effects of pyrolysis temperature and steam injection on pyrolysis behavior were quite different for each solid waste. It was found that the heating value of pyrolysis gas increases with the rise of pyrolysis temperature, and the peak value appears at the early stage of the pyrolysis process. It was also demonstrated that steam injection can significantly facilitate cracking of high molecular compounds and decompose char into H2, CO and C02, especially in the case of wood chips, where about twice gas yields was successfully obtained by steam injection.
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