Theoretical And Experimental Study Of Pyrolytic Carbon Steam Gasification

Pyrolytic carbon as a key product of the pyrolysis of waste tires, its recovery and application problems is a hot issue of experts and scholars in recent years. Among them, the pyrolytic carbon in ash high severely restricts the scope and areas of pyrolytic carbon recycling. Based on the characteristics of pyroylic carbon containing vast majority fixed carbon, high ash content, etc.. Proposed that using steam as gasification agent and conducting the experimental study of pyrolytic carbon steam gasification. The aim is to provide a theoretical basis and technical support for enhancing the pyrolytic carbon utilization and broadening the use of pyrolytic carbon pathways.(1) By studying the fundamental properties of pyrolytic carbon, clearing some basic chemical and physical properties of pyrolytic carbon. Most of pyrolytic carbon is fixed carbon, and is rich in pore structure can be used as gasification feedstock. By studying the theory of pyrolytic carbon steam gasification, not only defined the gasification reaction mechanism and reaction factors of pyrolytic carbon, and summarizes some relevant experimental kinetic model for subsequent analysis.(2) Design and construct a pyrolytic carbon steam gasification reaction bench and discuss impact factors of pyrolytic carbon steam gasification reaction process(reaction temperature, S/M, pyrolytic carbon particle size and reaction time). The results showed that the reaction temperature, S/M, particle size and reaction time on the pyrolytic carbon steam gasification experiment gas production rate, the impact of gas composition, gas calorific value and carbon conversion rate results vary. By orthogonal experiment to determine the optimal conditions for the gasification reaction:reaction temperature 850℃, S/M 1.12, particle size greater than 120 mesh and reaction time 45 min.(3) Use the volume kinetic model and unreacted shrinking core kinetic model to analysis the experimental results of pyrolytic carbon steam gasification reaction, and obtain relevant reaction kinetic parameters under the both kinetic models. The analysised results revealed that: the volume kinetic model is more suitable to describethe pyrolytic carbon steam gasification reaction behavior than unreacted shrinking core kinetic model. In addition, with the help of pyrolytic carbon steam gasification reaction material and energy balance, verify the feasibility of pyrolytic carbon steam gasification methods.