tailieunhanh - Heat and Mass Transfer Modeling and Simulation Part 6

Tham khảo tài liệu 'heat and mass transfer modeling and simulation part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Process Intensification of Steam Reforming for Hydrogen Production 91 Optimum conditions of the reactor were obtained. Hydrogen yield reached mol h -gcat under condition of Tr 260 C W M and WGHV h-1 which can provide hydrogen for PEMFC with a hydrogen utilization of 80 and an fuel cell efficiency of 60 . A 3-D model coupling with parallel reaction kinetics was obtained by data fitting to describe its performance. Furthermore gradually increased catalyst activity in the reaction channel can be used to further reduce the cold spot effect Hydrogen content at reactor outlet increased by about compared with catalyst uniform distribution condition while outlet CO content reduced to less than . 2. Cold spray technology was successfully used to catalytic coatings fabrication for fuel reforming reaction and all the powers were effectively deposited onto the substrates. Components of the coatings were approximately identical to the initial powders. Performance of the coating was influenced by impact velocity and broken character of the particles especially for the NiO Al2O3 and CuO ZnO Al2O3 catalytic coatings. For the Cu coating carbon deposition is serious which resulted in nonstable activity in methanol steam reforming compared with Cu-Al2O3 coating. At condition of inlet temperature 265 C W M of space velocity of 162h-1 H2 content in the products for CuO ZnO Al2O3 catalytic coating reaches whereas CO content is only . Methane primary steam reforming on cold sprayed NiO Al2O3 coating also indicated a superior character to kernel catalyst in packed bed reactor as its high output. 3. Through interrupted distribution of catalytic surface at same conditions methanol conversion could be improved although the temperature in reaction channel became uneven. So in micro-reactors which utilize coating catalyst this interrupted distribution of surface can improve the efficiency of catalyst and thus reduce loading and cost of reforming .