Study On Pretreatment And Co-refining Process Of Heavy Oil And Waste Tire Powder

In recent years,the production of waste tires in China has risen sharply.The traditional recycling process cannot realize the resource utilization of waste tires.The pyrolysis process of waste tires has the disadvantages of high pyrolysis temperature and poor pyrolysis efficiency due to its inability to operate continuously.Therefore,the combination of heavy oil and waste tire powder is proposed to overcome the above disadvantages.However,there is a serious swelling reaction between the waste tire powder and the heavy oil during the mixing process,resulting in a sharp increase in the viscosity of the mixed raw materials and a deterioration in stability,resulting in the transportation of the mixed raw materials.The pipeline of the process is blocked.In this paper,heavy oil and waste tire powder are taken as research objects.According to the change of the properties of waste tire powder and heavy oil mixed raw materials at different temperatures,the corresponding raw material pretreatment process is developed to prepare oilslurry raw materials with good dispersibility and high stability..The co-pyrolysis reaction of heavy oil and waste tire powder was carried out under nitrogen and hydrogen atmosphere to obtain pyrolysis products and its application was explored.The change of the properties of the raw materials of heavy oil and waste tire powder with temperature can be roughly divided into three stages: the swelling phenomenon mainly occurs at room temperature,so that the raw materials have no fluidity;the crosslinking phenomenon mainly occurs at room temperature to 200 °C.When the temperature rises,re-crosslinking will occur under stirring conditions,and the rubber powder particles will re-bond together to become a rubber block with strong viscosity and elasticity;after 200 °C,the main phenomenon of slurry formation will occur,and the raw materials will be transformed from solids.For liquids with fluidity,the rubber undergoes desulfurization and degradation,and the three-dimensional network structure is broken.According to the change of properties,the corresponding pretreatment process is developed.Through the pretreatment process,the heavy oil can be uniformly dispersed with the waste tire powder,and the fluid cement slurry has the pretreatment temperature of 260 ° C as the best and the pretreatment time is 20 min.Through the co-pyrolysis experiments of different types of heavy oil and waste tire powder under nitrogen and hydrogen atmosphere,it is found that CT is not suitable for co-pyrolysis experiments with waste tire powder.FCCS and MRAR have better effects,and the pyrolysis effect under hydrogen atmosphere is better than that.Pyrolysis effect under nitrogen atmosphere.The calorific value of pyrolysis gas in nitrogen and hydrogen atmosphere is higher than that of natural gas,which is a good combustion gas.The pyrolysis oil has higher synergistic effect on heavy oil and tire powder.The composition of oil is higher than that of pyrolysis alone.Subsequent hydrogenation of good raw materials;pyrolysis carbon black after acid washing /alkali washing surface performance and medium reinforcing carbon black,has a good application prospects.