Electrochemical Regeneration Kinetic Mechanism And Electric Field Simulation Of Complex Iron Catalysts

In order to meet the needs of small area and light weight of the FLNG sulfur recovery unit,the high efficiency complex iron liquid phase oxidation reduction sulfur recovery process needs to further implement the rapid regeneration of the desulfurization catalyst,which can effectively reduce the scale of the device.In this paper,the kinetic mechanism of the electrochemical regeneration of the complex iron catalyst was systematically studied.The sample machine was designed and produced in the electrochemical regeneration device for the complex iron catalyst.The regeneration efficiency of air regeneration and electrochemical regeneration was compared and studied.The electric field simulation of the electrochemical regeneration device of the complex iron catalyst was carried out by COMSOL software to optimize the structure of the electrochemical regeneration device of the complex iron catalystThe electrochemical regeneration process of the complex iron catalyst includes Electrolysis Regeneration and fuel cell regeneration.The fuel cell method realizes the rapid regeneration rate of the complex iron catalyst and can produce electric energy.The regeneration of the electrolysis method has the advantages of controlled electrolysis voltage and rapid regeneration rate.In this paper,the dynamic mechanism of two ways of electrochemical regeneration anodic process was studied by means of experimental test and finite element simulation,and the structure was optimized.By using electrochemical measurement techniques such as EIS,cyclic voltammetry and polarization curves,the kinetic mechanism of the electrode process of five kinds of anode materials,such as platinum electrode,platinum-plated titanium electrode,graphite,A alloy and B alloy,was systematically studied.For the electrochemical regeneration process of the complex iron catalyst,the platinum-plated titanium electrode was selected as the anode material for the electrochemical regeneration device of the complex iron catalyst fuel cell,and the A alloy and B alloy were selected as the anode materials of the electrochemical electrochemical regeneration device.By analyzing the electrode process of the electrochemical regeneration process,the electrode reaction mechanism under the mixed control of diffusion and electrochemical process is clarified.In this paper,a medium scale experimental prototype of air regeneration and electrochemical regeneration compounded sulfur recovery is designed and produced,and the comparison of treatment capacity in two ways is carried out.The results show that when the flow rate of catalyst is 2.0-2.5m³/h,the critical flow rate of the unit can be10L/minH₂S+35L/minCO₂ under the condition of air regeneration;Under the condition of electrochemical regeneration,the critical treatment flow is 28L/minH₂S mixed gas.The electrochemical regeneration rate of the device is 26.25%,about 3 times that of air regeneration.In this paper,the COMSOL software is used to simulate the electric field of the electrochemical regeneration device for the complex iron catalyst.Two different structures are designed in parallel arrangement and cross arrangement.The simulation results show that the arrangement of the intersecting arrangement has a greater potential difference,which shows that the driving force of the spontaneous reaction is greater and is suitable for fuel cell type.The distribution of potential and current density in parallel arrangement of electrode plates is more uniform,which is suitable for electrolytic regeneration process.