Flow pattern analysis and multi-objective optimization of helically corrugated tubes used in the intermediate heat exchanger for nuclear hydrogen production

Hu, Qingxiang; Yuan, Kun; Peng, Wei; He, Suqin; Zhao, Gang; Wang, Jie

doi:10.1016/j.ijhydene.2021.11.098

Cited by 16 publications

(5 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Multi-objective methods are useful when the reactor needs to achieve several goals [73][74][75][76]. For instance, in the reactor proposed in this work, a high yield of hydrogen may be achieved with a low conversion of nitrobenzene, which is undesired.…”

Section: Optimization Of the Operating Conditions Of Chemical Reactorsmentioning

confidence: 99%

Multi-objective optimization of aniline and hydrogen production in a directly coupled membrane reactor

Díaz

Willis

2022

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Section: Optimization Of the Operating Conditions Of Chemical Reactorsmentioning

confidence: 99%

Multi-objective optimization of aniline and hydrogen production in a directly coupled membrane reactor

Díaz

Willis

2022

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

“…The matrix method cannot avoid the random error generated by the test, the balance method lacks objectivity, and the analysis results may vary from person to person. Therefore, based on the variance method, this paper objectively analyzes the significance of each factor and the interaction between factors on the results and eliminates the random error in the test [32,33]. By means of the gray relational analysis, the dimension of the three optimization indices was reduced to one optimization index [34], which reduced the processing difficulty and clarified the optimization purpose.…”

Section: Comprehensive Evaluation Value Of Gas Extraction Effectmentioning

confidence: 99%

Determination of Gas Extraction Borehole Parameters in Fractured Zone on ‘Borehole in Place of Roadway’ Based on RSM-GRA-GA

et al. 2022

View full text Add to dashboard Cite

Large-diameter gas extraction borehole is considered an effective method by which to realize coal mine methane exploitation and outburst prevention. Efficient gas extraction can be achieved by selecting the right borehole parameters. In this paper, by comparing several conventional objective weighting methods, the PCA was used to assign the weights to the research indices, the optimization objective was reduced from multi-dimensional to one-dimensional with the help of the gray correlation analysis. The study of gas extraction effect under different borehole parameters based on the response surface model. Numerical simulations were used to analyze the mixed volume of gas extraction, the pure volume of extraction and the concentration in the upper corner after extraction under different schemes. Finally, a genetic algorithm degree model was used to solve the solution and determine the optimal arrangement of borehole parameters. The study shows that (1) the weight shares of borehole stratum, borehole diameter and borehole spacing were 0.385, 0.285 and 0.33, respectively, in the reduced dimensional analysis of the PCA. (2) Using the results of improved gray correlation analysis as a comprehensive evaluation value to measure the effect of gas extraction, the optimal range of the model was 28–30 m borehole level, 190–210 mm borehole diameter and 5.5–6.5 m borehole spacing. (3) Using the genetic algorithm to solve the model, we obtained the borehole layer 28.79 m, borehole diameter 199.89 mm, borehole spacing 5.76 m. The borehole gas extraction effect was good under this parameter. The extraction mixed volume was 129.8 m3/min, the extraction pure volume was 9.16 m3/min, the upper corner concentration was 0.52%, and the prediction accuracy of the model was 97.8%.

show abstract

“…Thus, it is regarded as an ideal reactor type for nuclear hydrogen production due to its continuous and stable process heat supply. [11][12] The thermochemical water-splitting cycle is an important research direction for nuclear hydrogen production. In particular, the iodine-sulfur (IS) cycle, a wellknown and promising cycle, is considered the most suitable for coupling with a VHTR to achieve efficient hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

“…For the HI section, the heavy phase ( 11) is first heated by E-1 0 before entering the purification reactor (R-2 0 ), where the reverse Bunsen reaction occurs to remove residual H 2 SO 4 . Then, stream (12) enters the vapor-liquid separator (Sep-3 0 ), and the separated vapor phase ( 13) is condensed by E-4 0 and sent to the Bunsen section. The liquid phase ( 14) is mixed with the liquid phase (20) flowing out from the bottom of the distillation column (DT-9 0 ), and then cooled by E-6 0 and divided into two streams to enter the cathode and anode of the EED cell (U-8 0 ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of internal heat exchange network and hydrogen production efficiency of iodine–sulfur cycle for nuclear hydrogen production

Peng

et al. 2022

Intl J of Energy Research

Self Cite

View full text Add to dashboard Cite

Summary Nuclear energy enables large‐scale carbon‐free hydrogen production, and the coupling of the very‐high‐temperature gas‐cooled reactor and iodine–sulfur (IS) cycle has the potential to achieve efficient hydrogen production. This study develops the flowsheet of IS process, performs process simulation, designs the internal heat exchange network using pinch point technology, and discusses the thermal efficiency of hydrogen production in detail. The results show that if all heat released by heat exchangers in H2SO4 and HI sections can be fully recovered and utilized, the upper bound of the thermal efficiency of the IS process is 51.9%. The pinch point temperature difference has little impact on the performance of the heat exchange network of the H2SO4 section, but greatly influences the performance of the heat exchange network of the HI section. When the pinch point temperature difference is 5°C to 20°C, the input heat duties required by the H2SO4 and HI sections are reduced by 23.9% to 25.0% and 20.8% to 50.8%, respectively, compared with those without heat exchange networks. After designing the heat exchange network, considering the recovery and utilization of a portion of waste heat, a more realistic hydrogen production efficiency of 30.0% to 37.1% corresponding to the pinch point temperature difference of 5°C to 20°C is given. Highlights Process simulation of IS cycle is conducted to analyze its energy consumption. Internal heat exchange network is designed using pinch point technology. Network performance is studied at different pinch point temperature differences. Thermal efficiency of hydrogen production is discussed in detail.

show abstract

Flow pattern analysis and multi-objective optimization of helically corrugated tubes used in the intermediate heat exchanger for nuclear hydrogen production

Cited by 16 publications

References 40 publications

Multi-objective optimization of aniline and hydrogen production in a directly coupled membrane reactor

Multi-objective optimization of aniline and hydrogen production in a directly coupled membrane reactor

Determination of Gas Extraction Borehole Parameters in Fractured Zone on ‘Borehole in Place of Roadway’ Based on RSM-GRA-GA

Analysis of internal heat exchange network and hydrogen production efficiency of iodine–sulfur cycle for nuclear hydrogen production

Contact Info

Product

Resources

About