Study on air-blast atomizing nozzles application in methanol-to-propylene reactors

In order to apply two-channel air-blast atomizing nozzles into an industrial MTP multistage quenching fixed-bed reactor,the nozzles were deployed in the feeding distributors of the fixed-bed,and then industrial adaptivity of the nozzles installed in the fourth bed of the reactor with the diameter of 12 m was studied.The relationships among feeding rates of sideline reactants,inlet & outlet temperatures of the reactor bed and bed temperatures in different locations were also analyzed.The results showed that at induction phase,the feeding rates of gas-phase reactants and liquid-phase reactants arrived at 10 070 m3/h and 1 297 kg/h,with the corresponding inlet & outlet temperatures of the bed being 460 ℃ and 485 ℃ respectively.At the stable phase,the feeding rates of liquid-phase reactants and gas-phase reactants were 1 069 kg/h and 10 811 m3/h,and the corresponding inlet & outlet temperatures of the bed were 459 ℃ and 490 ℃.During the period of the deactivation,the feeding rates of gas-phase reactants slightly decreased to 10 006 m3/h,while the feeding rate of liquid-phase reactants increased to 1 302 kg/h,and the inlet & outlet temperatures of the bed became 466 ℃ and 490℃.Compared with Luqi nozzles,it is easier for the two-channel air-blast nozzles to regulate the bed temperature of the MTP reactor.