Investigation On Fabrication And Pressure Drop And Heat Transfer Of Honeycombed Stainless Steel Fiber Sintered Felt

Catalytic reaction is the effective method in the field of volatile organic compounds elimination. The performance and working life of catalysts are deeply influenced by catalytic supports. A novel catalyst support — stainless steel fiber sintered felt with honeycombed channels(SSFSFHC) is prepared in this paper. The SSFSFHCs contain the characteristics of low pressure drop of honeycombed support and radial mass transfer of fibrous support. The preparation processes, steady-state heat transfer and pressure drop of SSFSFHC have been systematacially studied in this paper. The detailed researches are shown below:(1)The preparation and characterization of SSFSFHCThe parameters of multi-tooth tool and cutting process are confirmed to manufacture the stainless steel fibers. The surface of stainless steel fiber is full of sags and crests characterized by laminar and jagged structures, and the diameter of fiber range from 130μm to 150μm. The preparation procedures are confirmed and the formed SSFSFHCs composed of threedimensional reticulated skeleton, irregular open pores and interconnected parallel channels.What’s more, the influence of honeycombed channels on local deformation of felt have been studied. The results show that, honeycombed channels result in the formation of local compressed section around them. The compressed section extends with the channel diameter increasing, and the equivalent porosity of compressed section decreases with the channel diameter increasing.(2)The pressure drop characteristics of SSFSFHCThe influence of structural parameters on pressure drop characteristics have been studied through wind tunnel experiments. Results show that the permeability and inertia coefficient almost remain unchanged when channel diameter increasing. But with the porosity and channel occupied area ratio increasing, the permeability increases whereas the inertia coefficient decreases. Under the same conditions, the inertia coefficients of rough surface felts are higher than that of smooth surface felts and metallic foams. What’s more, the modified correlations of permeability and inertia coefficient of stainless steel fiber sintered felt with honeycombed channels and rough surface are inferred.(3)The steady-state heat transfer characteristics of SSFSFHCThe influence of structural parameters on steady-state heat transfer characteristics have been studied through auxiliary plate method. Results show that the effective thermal conductivity increases with porosity and channel occupied area ratio decreasing, but increases with hot side temperature and channel diameter increasing. The equivalent resistance model of SSFSFHC is built up and the equivalent thermal conductivity of SSFSFHC is inferred. In addition, the correlations of effective thermal conductivity of felts without channels based on experimental results and Parallel-Series model are inferred. Finally, it is showed that experimental results is in accordance with the equivalent thermal resistance model for the influence of honeycombed channels on thermal conductivity of SSFSFHC.(4)The orthogonal analysis of the influence of factors on the performance of SSFSFHCThe orthogonal experiments have been used to study the influence of porosity, channel diameter, channel occupied area ratio and their interactive effects on the effective thermal conductivity, permeability and inertia coefficient of SSFSFHC. The influence level of those three single factors and their interactive effects on the performance of SSFSFHC are studied as well. Finally, the most appropriate structural parameters of SSFSFHC are selected out for applied as catalytic support of VOCs removing.