Process analysis and optimization of innovative Ohmic-heating reactor for enhanced steam methane reforming
Conventional steam methane reforming(SMR)reactor(cSMR reactor)often exhibit significant radial temperature gradients,increasing the risk of catalyst deactivation due to carbon deposits.A novel design,the Ohmic-heating fixed-bed reactor with inner and outer tubes for steam reformingr(eSMR reactor),has been proposed to replace the conventional combustion-based heating method employed in industrial reactor.Using a two-dimensional quasi-homogeneous fixed-bed reactor simulation,the performance differences between eSMR and cSMR reactor were compared,and the effects of eSMR reactor structure and operating conditions on its performance were analyzed.The results show that compared to cSMR,eSMR reactor exhibits a 26.6%higher outlet average methane conversion rate,a 121 K higher outlet average temperature,and a more uniform radial temperature distribution.When the inner-to-outer tube diameter ratio is 0.589,the radial temperature gradient is minimized in eSMR reactor.Increasing the inlet temperature,heating voltage,and steam-methane ratio all enhance the outlet average methane conversion rate and outlet average temperature in eSMR reactor,while the effect of increasing inlet pressure is the opposite.This research can offer valuable insights for the development of Ohmic heating-based steam methane reforming reactors.
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