Experimental Investigation on Pyrolysis of <i>n</i>-Decane Initiated by Nitropropane under Supercritical Pressure in a Miniature Tube

Jia, Zhenjian; Zhou, Weixing; Yu, Wangyang; Han, Zhixiong

doi:10.1021/acs.energyfuels.9b00593

Cited by 21 publications

(4 citation statements)

References 46 publications

(83 reference statements)

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“…They also studied supercritical fuel in a vertical helical pipe, which presented that the heat transfer intensity of the outside was 31.5% larger than that of the inside due to the centrifugal secondary flow (Wen et al, 2017b). Jia et al (2019) explored the effect of an initiator (nitropropane) on the hydrocarbon pyrolysis in a miniature pipe, and it was demonstrated that the pyrolysis temperature of n-decane was reduced by 100 K. Qin et al (2013) clarified the parameter-dependent chemical recuperation process of supercritical hydrocarbon fuel. Liang et al (2017) researched the impact of high pyrolysis on thermal Most of the above studies focused on the flow characteristics and thermal performances of supercritical aviation kerosene as well as the cracking reactions.…”

Section: Supercritical Aviation Kerosenementioning

confidence: 99%

Research status of supercritical aviation kerosene and a convection heat transfer considering thermal pyrolysis

Zhang

Xie

et al. 2022

HFF

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Purpose This paper aims to comprehensively clarify the research status of thermal transport of supercritical aviation kerosene, with particular interests in the effect of cracking on heat transfer. Design/methodology/approach A brief review of current research on supercritical aviation kerosene is presented in views of the surrogate model of hydrocarbon fuels, chemical cracking mechanism of hydrocarbon fuels, thermo-physical properties of hydrocarbon fuels, turbulence models, flow characteristics and thermal performances, which indicates that more efforts need to be directed into these topics. Therefore, supercritical thermal transport of n-decane is then computationally investigated in the condition of thermal pyrolysis, while the ASPEN HYSYS gives the properties of n-decane and pyrolysis products. In addition, the one-step chemical cracking mechanism and SST k-ω turbulence model are applied with relatively high precision. Findings The existing surrogate models of aviation kerosene are limited to a specific scope of application and their thermo-physical properties deviate from the experimental data. The turbulence models used to implement numerical simulation should be studied to further improve the prediction accuracy. The thermal-induced acceleration is driven by the drastic density change, which is caused by the production of small molecules. The wall temperature of the combustion chamber can be effectively reduced by this behavior, i.e. the phenomenon of heat transfer deterioration can be attenuated or suppressed by thermal pyrolysis. Originality/value The issues in numerical studies of supercritical aviation kerosene are clearly revealed, and the conjugation mechanism between thermal pyrolysis and convective heat transfer is initially presented.

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Section: Supercritical Aviation Kerosenementioning

confidence: 99%

Research status of supercritical aviation kerosene and a convection heat transfer considering thermal pyrolysis

Zhang

Xie

et al. 2022

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“…Li et al 76 have examined the combustion energy of JP-10 fuel, and the estimated value of the combustion energy is 39 MJ/L, and it is sufficient to maintain the required thrust for a supersonic vehicle. Jia et al 77 have studied the influence of nitropropane on the cracking performance of ndecane in a tubular reactor (1 m in length and 1 mm in diameter). The work was carried out in the temperature range A summary of the consequence of different initiators on the cracking characteristics of hydrocarbon fuels is tabulated in Table 6.…”

Section: Suitability Of Initiators To Enhance the Endothermicity Of H...mentioning

confidence: 99%

Heat Management in Supersonic/Hypersonic Vehicles Using Endothermic Fuel: Perspective and Challenges

et al. 2021

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In this study, an in-depth analysis has been performed on various technoengineering aspects of hydrocarbon cracking under supercritical conditions toward developing an endothermic fuel. The paper is segregated into several sections with specific emphasis. The major areas covered in this work include physicochemical characteristics of different endothermic fuels, supercritical pyrolysis of hydrocarbon fuels, phenomena of coking, and its suppression from an application viewpoint. The influence of various parameters (e.g., temperature, pressure, catalysts, space−time, etc.) on fuel conversion, endothermicity, and coke propensity has been emphasized in detail. The typical value of endothermic heat sink capacity for different fuels consisting of C 8 to C 15 hydrocarbons ranges from 500 to 1150 kJ/kg over temperature and pressure ranges of 550−750 °C and 25−55 bar, respectively. The effectiveness of various additives/initiators in improving endothermicity has been screened for wide ranges of temperature and pressure. Physicochemical properties like distillation characteristics, hydrocarbon composition, °API gravity, and sulfur content of different hydrocarbon fuels are compared in a single window. Most of the findings are abridged meticulously with relevant tables and plots. Toward the end, we have highlighted the critical issues/challenges on the experimental findings and prospective.

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“…The addition of 10 wt% of trimethylamine (TEA) can improve the n‐heptane fuel conversion by about 25% 23 . The presence of 4 wt% of nitropropane improved the conversion of n‐decane from 10% to 27% at 614°C 24 . About 4% of diphenyl selenide can improve the capacity of the total heat sink of n‐heptane and n‐decane to a tune of about 17% and 10%, respectively, at 570°C 25 .…”

Section: Introductionmentioning

confidence: 99%

“…[20][21][22] The addition of 10 wt% of trimethylamine (TEA) can improve the n-heptane fuel conversion by about 25%. 23 The presence of 4 wt% of nitropropane improved the conversion of n-decane from 10% to 27% at 614 C. 24 About 4% of diphenyl selenide can improve the capacity of the total heat sink of nheptane and n-decane to a tune of about 17% and 10%, respectively, at 570 C. 25 DeBlase et al 26 investigated the influence of aliphatic and aromatic content on the endothermicity of hydrocarbon fuels. Conversion of nheptane at 540 C and 30 bar pressure enhanced by about 20% in the presence of 3 wt% of TEA.…”

Section: Introductionmentioning

confidence: 99%

Regenerative cooling capacity of hydrogenated carene under supercritical environment

Konda

Dinda

2022

Intl J of Energy Research

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Summary The thermal cracking characteristic of an in‐house prepared plant‐derived hydrogenated carene (H‐Carene) fuel is examined above its critical temperature and pressure. The experiments were performed for a wide range of temperatures between 450°C and 650°C at 40 bar pressure in a tubular flow reactor. At 650°C and 40 bar pressure, the conversion of the H‐Carene fuel is about 40%, and the estimated value of chemical heat sink capacity is 488 kJ/kg of fuel. The aptness of triethylamine (TEA) as an initiator to improve the heat sink capacity of the H‐Carene fuel is also examined. The investigation showed that the initiator improved the fuel conversion and endothermicity. The endothermic heat sink capacity of the H‐Carene increased by about 28% at 650°C with 5% (by weight) of TEA. It is noted that the sensitivity of temperature on the coke formation rate is higher than the initiator sensitivity for a similar range of the conversion change. The thermal cracking of H‐Carene follows a first‐order kinetic model, and the estimated value of the apparent activation energy of the H‐Carene cracking reaction is about 95 kJ/mol. The work shows that the heat sink capability of the plant‐derived H‐Carene fuel is comparable with JP‐7, a petroleum‐derived fuel. Novelty Statement The manuscript presented the cracking characteristics of hydrogenated carene under supercritical conditions emphasizing various features like detailed characterization, feed conversion, product distribution, cooling capacities, coke deposition rate, cracking kinetics, and so on. It also highlighted the suitability of an amine‐based initiator to enhance the endothermicity of the fuel. The study is unique and not found in any article which addressed the above aspects altogether.

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Experimental Investigation on Pyrolysis of n-Decane Initiated by Nitropropane under Supercritical Pressure in a Miniature Tube

Cited by 21 publications

References 46 publications

Research status of supercritical aviation kerosene and a convection heat transfer considering thermal pyrolysis

Research status of supercritical aviation kerosene and a convection heat transfer considering thermal pyrolysis

Heat Management in Supersonic/Hypersonic Vehicles Using Endothermic Fuel: Perspective and Challenges

Regenerative cooling capacity of hydrogenated carene under supercritical environment

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