Effects of endothermic hydrocarbon fuel composition on the pyrolysis and anti-coking performance under supercritical conditions

Sun, Dong; Li, Chunying; Du, Yonghua; Kou, Liangang; Zhang, Jianwei; Li, Yuan; Wang, Zhixuan; Li, Jiangwei; Feng, Hao; Lü, Jian

doi:10.1016/j.fuel.2018.11.003

Cited by 48 publications

(7 citation statements)

References 41 publications

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“…33−35 In general, filamentous carbon and spherical carbon can be attributed to metal catalytic effect and vapor-phase condensation, respectively. 36,37 This phenomenon implies that the metal catalytic coking has been inhibited and the mechanism of condensation of aromatic compounds is primary. Different from that, there are some filamentous coke produced on sheets 3 # and 5 # , and some metal particles on the top of filamentous coke are formed by the decomposition of transition-state carbides, which further control the continuous growth of coke (Figure 6b,c).…”

Section: Resultsmentioning

confidence: 99%

“…Because the fuel contains less aromatic hydrocarbon precursors, the coke generated on sheet 1 # is almost spherical coke, as shown in Figure a. At present, it is generally accepted that the coking formation on the inner surface of the stainless tube mainly results from metal catalytic coking. − In general, filamentous carbon and spherical carbon can be attributed to metal catalytic effect and vapor-phase condensation, respectively. , This phenomenon implies that the metal catalytic coking has been inhibited and the mechanism of condensation of aromatic compounds is primary. Different from that, there are some filamentous coke produced on sheets 3 # and 5 # , and some metal particles on the top of filamentous coke are formed by the decomposition of transition-state carbides, which further control the continuous growth of coke (Figure b,c).…”

Section: Resultsmentioning

confidence: 99%

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Investigation on Carburization during the Repeated Coking and Decoking Process

Wang

Gong

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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In this work, stainless steel blank tube and TiN-coated tube obtained by atmospheric-pressure chemical vapor deposition were used to explore the carburization during the repeated coking and decoking process. Various analytical techniques including scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Raman spectroscopy were applied to analyze the morphology, composition, and type of coke. To protect the pipeline, the on-line decoking method was used to determine the amount of coke. During the coking experiment, it was observed that carburization and metal outdiffusion occurred on the inner surface of the microchannel by scanning the cross section of reaction sheets. Moreover, the coke mass of the blank tube in the next coking experiment increased evidently after the previous coking and decoking cycle. However, under the same experimental condition, TiN coatings transforming into TiO2–TiC x N y –TiN multilayer films could still maintain anticoking performance because it alleviated the carburization and metal outdiffusion.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Investigation on Carburization during the Repeated Coking and Decoking Process

Wang

Gong

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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“…In contrast, a liquid hydrocarbon can provide the required cooling without the problems allied with a cryogenic fuel. 14 The heat sink capacity of a hydrocarbon fuel depends on the chemical composition of the fuel and operating severity. 15 The chemical heat sink capacity of a fuel is proportional to its extent of cracking at a particular temperature and pressure condition.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the cost of fuels, logistics, and safety can be the other issues. In contrast, a liquid hydrocarbon can provide the required cooling without the problems allied with a cryogenic fuel 14 …”

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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“…As aircraft speeds increase, gradually severe aerodynamic heating causes the temperature of the fuselage to rise rapidly, causing it to approach or even exceed the heat resistance limitation that the existing structural materials can withstand. , To address these harsh thermal management challenges, researchers have proposed the regeneration cooling technology, which adopts propitious endothermic hydrocarbon fuels as the coolant due to the high chemical heat sink (as high as 2.5 MJ/kg) generated by the thermal pyrolysis or catalytic decomposition of these fuels. , Unfortunately, thermal pyrolysis suffers from several adverse factors, such as high activation energy, slow reaction rate, and uncontrollable products, which cannot satisfy the requirements for a heat sink in practical applications. , In contrast, catalytic decomposition can effectively reduce the reaction activation energy, accelerate the decomposing reaction rate, regulate the selectivity of olefin products, and promote the formation of small molecular products. , In addition, the catalytic decomposition effectively improves the heat sink value and contributes to the subsequent ignition and combustion processing of fuels. , …”

Section: Introductionmentioning

confidence: 99%

Decomposition Mechanism of Isoprenoid Hydrocarbon p-Menthane in the Presence of Pt@FGS Nanoparticles: A ReaxFF-MD Study

et al. 2022

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Pt@FGS nanoparticles have shown effective enhancement in the decomposition of hydrocarbon fuels. To further explore the potential enhancing mechanisms of Pt@FGS nanoparticles, the catalytic decomposition of p-menthane, a bioderived isoprenoid “drop-in” fuel with great promise, is investigated here using the reactive force-field molecular dynamics (ReaxFF-MD) simulations. The results show that the Pt@FGS nanoparticles exhibit good catalytic reactivity with a reduction of the activation energy by nearly 62%. Possible initial reactions of enhanced p-menthane (PMT) decomposition are discussed, which suggests that the supported Pt-cluster plays a key role in the dehydrogenation of PMT, as does the oxygen-containing functional group of the functionalized graphene sheets (FGS). It is also interesting to note that the presence of Pt@FGS causes the initial reactions, which are dominated by H-abstraction, favorable in both kinetics and thermodynamics.

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Effects of endothermic hydrocarbon fuel composition on the pyrolysis and anti-coking performance under supercritical conditions

Cited by 48 publications

References 41 publications

Investigation on Carburization during the Repeated Coking and Decoking Process

Investigation on Carburization during the Repeated Coking and Decoking Process

Regenerative cooling capacity of hydrogenated carene under supercritical environment

Decomposition Mechanism of Isoprenoid Hydrocarbon p-Menthane in the Presence of Pt@FGS Nanoparticles: A ReaxFF-MD Study

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