Integrated electrolyser—metal hydride compression system

“…Figure 3Packed bed reactors. (a) A packed bed reactor with spiral fins[36]; (b) a packed bed reactor with metal foams[40]. Figure 4 Packed bed heat storage systems. (a) The gaseous reactant stored as liquid.…”

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confidence: 99%

Gas–solid thermochemical heat storage reactors for high-temperature applications

Pan

Zhao

2017

Energy

100

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“…a fuelling station, where hydrogen would be produced by electrolysis. Since electrolysis is nearly 65% efficient, its waste heat could be recycled through the compression operation, which is required to store the hydrogen [5].…”

Section: Introductionmentioning

confidence: 99%

“…We assume that sufficient purification of the gas can be performed without previous compression and that a large amount of heat can be recovered within the electrolyser's cooling system (up to 150 kJ per mol of H 2 produced). The interconnection project is described in much detail in our previous publications [5][6].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on a metal hydride based hydrogen compressor

Laurencelle¹,

Dehouche²,

Morin³

et al. 2009

Journal of Alloys and Compounds

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A three-stage metal hydride based hydrogen compressor prototype was built. It has been initially constructed for a hydrogen production facility using a low-pressure alkaline electrolyser. The compression system has been designed to transfer heat recovered from the electrolyser in the hydride beds to allow hydrogen desorption flow. The three-stage compressor achieves a compression ratio of 20:1 atm. It performs a thermal cycling of three AB 5 hydrides between 20 and 80°C. Its flow rate, for 25 g of each hydride bed, reaches about 20 L (NTP) of hydrogen per hour. The prototype is now operational. Some improvements in the heat transfer management system are also carried out before proceeding to the interconnection with the electrolyser and to the extent that the hydrogen produced satisfies the high purity requirement of the hydrides used in the compressor.

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“…Muthukumar et al [8] have built a single system with a smaller reactor but its hydrogendesorbed pressure was 4.38 MPa. And Laurencelle et al [9] have set up a three stage compression system with a high compressing ratio of 20, however, its hydrogendesorbed pressure was only 2 MPa. These systems cannot meet the requirements when the hydrogen compressors are considered to be applied to the fuel-cell vehicle.…”

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A 38 MPa compressor based on metal hydrides

Hu¹,

Qi²,

Yang³

et al. 2012

J. Shanghai Jiaotong Univ. (Sci.)

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Known as one of the most promising application of metal hydride (MH), the MH compressor can afford hydrogen with high pressure and high purity. Two AB5 type multi-component hydrogen storage alloys and vanadium are studied for the purpose of high pressure compression. A compact compression system has been built. Each designed small-size reactor contains seven special stainless-steel pipes. The single stage compressor can improve the hydrogen pressure from 2 up to 35 MPa with the hydrogen desorbed per unit mass of 207.8 mL/g. The two-stage compression can output hydrogen with pressure of 38 MPa steadily in whole 5.7 mol hydrogen output flow. However, its hydrogen desorbed per unit mass was only computed to 106.9 mL/g as a result of two reactors used in the cycle and the output mass of hydrogen increased less.Along with the development of hydrogen energy, metal hydride compressors have become a potential solution to take the place of traditional mechanical hydrogen compressors and been applied to the fuel-cell vehicle. With more and more different type metal hydrides have been exploited, it makes possible that high pressure ratio metal hydride compressors system can be realized. In fact, the Brookhaven Laboratory [1] has already developed a metal hydride compressor with MmNi 5 type alloys in 1976. It can elevate the pressure to 19.3 MPa with feed gas ranging from 6.9 to 13.8 MPa through cooling and heating cycles at 273 and 373 K. Shmal' ko et al. [2] designed another metal hydride compressor on hydrogen desorbed capacity of 10 m 3 /h, accomplishing a pressure ratio of 50 from 0.3 to 15.0 MPa with air cooling. Recently, Wang et al. [3] developed a two-stage compressor system that realized a compression ratio of 11 from 4 to 45 MPa with AB 5 and AB 2 alloys.Although studies of metal hydride compression have gain significant achievements in both literatures and experiments, the hydrogen storage alloys and compression system still need to be optimized to reach a higher pressure and realize continuous hydrogen-output since the reported desorbed hydrogen pressure around 15 MPa can't meet the requirement of fuel-cell vehicle. The parameters of operation circles and structures of reactors have been considered to be influential elements on the performance of compression [3][4][5][6][7] . Meanwhile, a compact system is also required when the compressor is used in a fuel-cell vehicle. Muthukumar et al. [8] have built a single system with a smaller reactor but its hydrogendesorbed pressure was 4.38 MPa. And Laurencelle et al. [9] have set up a three stage compression system with a high compressing ratio of 20, however, its hydrogendesorbed pressure was only 2 MPa. These systems cannot meet the requirements when the hydrogen compressors are considered to be applied to the fuel-cell vehicle. So in this study, a new shell-and-tube reactor and absorption/desorption system have been designed. It can produce hydrogen of 35 MPa in the single stage compression and implement the process of continuous and steady hydrogen outputting in 3...

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Integrated electrolyser—metal hydride compression system

Cited by 54 publications

References 13 publications

Gas–solid thermochemical heat storage reactors for high-temperature applications

Gas–solid thermochemical heat storage reactors for high-temperature applications

Experimental study on a metal hydride based hydrogen compressor

A 38 MPa compressor based on metal hydrides

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