The Design,Simulation And Application Of Continuous Pyrolysis Reactor For Oily Sludge

The production of oily sludge is increasing every year,oily sludge must be disposed of immediately.Pyrolysis is extremely important as a way to dispose of oily sludge.As a key part of pyrolysis,pyrolysis equipment directly determines the effect of pyrolysis.In response to the problem of oily sludge,this project developed a vertical continuous pyrolysis device,analyzed the working principle of the pyrolysis equipment and the movement of the particles.The components of the device were designed,and the continuous pyrolysis device was determined to have a conveying capacity of 3 kg/h,a spiral diameter of 50 mm,a pitch of 30 mm,a shaft diameter of 25 mm,and a theoretical spiral speed of the vertical section of 122.2 r/min.In addition,COMSOL was used to simulate the movement and heat of the internal materials during the operation of the pyrolysis reactor in the first time.The spiral speed and temperature were changed between 60-120 r/min and 400-750? to obtain different velocity and temperatures field distributions.When the feed rate is 120 r/min,the speed of the sludge particles reaches 0.33m/s.It proves that the material is strenuously moving in the furnace,accelerating mass transfer and heat transfer.When the temperature is 923 K and the feeding speed is 1 r/min,the length of the constant temperature interval is 775 mm,which proves the rationality of the device design.On this basis,cold experiments were carried out on sand,wet soil and oily sludge to analyze the transportation of different materials.The influence of different materials and rotational speed on the conveying effect is analyzed.The comparison shows that the conveying effect is dry sand>oily sludge>wet soil.The faster the feeding speed is,the shorter the residence time of materials in the device is.When the feeding speed is 4 r/min,the residence time is 0.55 h.During the test,the problem of the device was corrected in time to ensure the stability of material transportation in cold condition.Finally,the pyrolysis experiment of oily sludge was carried out to investigate the effect of the device on the pyrolysis of oily sludge at different temperatures,feeding rates and stirring intensity.It mainly includes pyrolysis gas yield,pyrolysis oil yield and residue oil content.The physical and chemical properties of pyrolysis products were analyzed.Finally,the oil content of oily sludge was reduced to 1.8%,which reached the expected target of less than 2%,and proved the feasibility of the device for treating oily sludge.