Effects of structural parameters on the performance of a micro-reactor with micro-pin-fin arrays (MPFAR) for hydrogen production

Mei, Deqing; Qian, Miao; Yao, Zhehe; Liu, Binhong; Lou, Xinyang; Chen, Zichen

doi:10.1016/j.ijhydene.2012.09.011

Cited by 49 publications

(10 citation statements)

References 19 publications

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“…Other investigators [25] reported that increasing fin height (relative to the channel height for square fin cases) results an up to an increase of 44% for Nu and 7.4 kPa for pressure drop. Mei et al [30] found the heat transfer and pressure drop sensitive to the tip clearance for low Re cases. Similarly, smaller clearance brings better thermal performance but higher hydraulic resistance as well.…”

Section: Introductionmentioning

confidence: 99%

Entropy generation and optimization of laminar convective heat transfer and fluid flow in a microchannel with staggered arrays of pin fin structure with tip clearance

Shi

Dong

2015

Energy Conversion and Management

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Section: Introductionmentioning

confidence: 99%

Entropy generation and optimization of laminar convective heat transfer and fluid flow in a microchannel with staggered arrays of pin fin structure with tip clearance

Shi

Dong

2015

Energy Conversion and Management

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“…In the previous work, structure design, process and manufacture of methanol microreactor for hydrogen production, and reaction support of methanol microreactor for hydrogen production are mainly studied in the research of methanol steam reforming technology [6][7][8][9][10][11][12][13][14][15][16][17][18]. In the structure design of the microreactor, microreactors such as a plate-fin microreactor, cube-post microreactor, annular microreactor, and cylindrical microreactor have been developed [6][7][8][9][10]. In the process and manufacture of a methanol microreactor, processing technologies such as milling, special process, and microelectromechanical systems (MEMSs) have been used to manufacture straight channels, serpentine channels, spiral channels, etc.…”

Section: Introductionmentioning

confidence: 99%

Methanol steam reforming performance optimisation of cylindrical microreactor for hydrogen production utilising error backpropagation and genetic algorithm

Zheng

Zhou

et al. 2019

Chemical Engineering Journal

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To optimise methanol steam reforming performance of cylindrical microreactor for hydrogen production, an error backpropagation algorithm was used to build a mathematical model for reaction performance of different microreactors for hydrogen production. Additionally, a genetic algorithm (GA) was utilised to process the computational model to obtain the optimum reaction parameters. The reliability of the optimum reaction parameters of cylindrical microreactor for hydrogen production was verified by experiments. Firstly, take plate microreactor as an example, the porosity of porous copper fiber sintered sheet (PCFSS), reaction temperature of methanol steam reforming for hydrogen production, injection velocity of the methanol and water mixture, and catalyst loading of PCFSS were considered as input data, whereas methanol conversion was used as output data. The computational model for specific testing system was gained by utilising input and output data from specific testing system to train the mathematical model for different microreactors, combining with matrix laboratory (MATLAB) neural network toolbox and designed MATLAB program. The E max of 5% for plate microreactor and E max of 3.2% for cylindrical microreactor verified the good predictive ability and reliability of the computational model for plate and cylindrical microreactor, indicating the reliability and universal applicability of the mathematical model for different microreactors. Secondly, the effects and mechanisms of PPI, reaction temperature, injection velocity, and catalyst loading on methanol conversion were studied, relying on the computational model. Finally, the optimum reaction parameters were acquired using GA, MATLAB neural network toolbox and designed MATLAB program. The validity of the optimum reaction parameters of cylindrical microreactor for hydrogen production was confirmed by experiments. This study provides a reference method for methanol steam reforming performance optimisation for hydrogen production.Highlights >Error backpropagation algorithm is used to built general mathematical model.>Computational model is established based on general mathematical model.>Computational model shows good reliability and predictive ability. >Relations between reaction parameters and performance are studied. > Optimum reaction parameters are obtained by using genetic algorithm.Graphical abstract

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“…In general, the traditional microreactors for hydrogen production are classified into three types-parallel, curved, and micro-pin-fin arrays-and fabricated by means of MEMS, laser machining, electrical discharge machining, and traditional machining technology [7][8][9][10][11][12]. The catalyst is usually coated by means of impregnation as well as chemical and physical vapor deposition.…”

Section: Introductionmentioning

confidence: 99%

Development of cylindrical laminated methanol steam reforming microreactor with cascading metal foams as catalyst support

Zhou

Wang

et al. 2017

Fuel

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Abstract:In this study, the cascading metal foams were used as catalyst supports for constructing a new type of cylindrical laminated methanol steam reforming microreactor for hydrogen production. The two-layer impregnation method was used to load the Cu/Zn/Al/Zr catalysts, and the ultrasonic vibration method was then employed to investigate the loading performance of metal foams with different types and thicknesses. Furthermore, the effect of the type of catalyst placement, pores per inch (PPI) and foam type on the performance of methanol steam reforming microreactor was studied by varying the gas hourly space velocity (GHSV) and reaction temperature. Compared with two other types of catalyst placement studied, the microreactor containing catalyst-loaded metal foams without clearance cascading (3×2) showed the highest hydrogen production performance. When the PPI of the metal foam was increased from 50 to 100, both the methanol conversion and the H2 flow rate gradually increased. Our results also showed that a microreactor with Cu foam as a catalyst support exhibits increased hydrogen production and higher stability than those of a microreactor with Ni foam.

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Effects of structural parameters on the performance of a micro-reactor with micro-pin-fin arrays (MPFAR) for hydrogen production

Cited by 49 publications

References 19 publications

Entropy generation and optimization of laminar convective heat transfer and fluid flow in a microchannel with staggered arrays of pin fin structure with tip clearance

Entropy generation and optimization of laminar convective heat transfer and fluid flow in a microchannel with staggered arrays of pin fin structure with tip clearance

Methanol steam reforming performance optimisation of cylindrical microreactor for hydrogen production utilising error backpropagation and genetic algorithm

Development of cylindrical laminated methanol steam reforming microreactor with cascading metal foams as catalyst support

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