Pyrolysis and coking of endothermic hydrocarbon fuel in regenerative cooling channel under different pressures

Jin, Baitang; Jing, Kai; Liu, Jie; Zhang, Xiangwen; Liu, Guozhu

doi:10.1016/j.jaap.2017.04.010

Cited by 77 publications

(28 citation statements)

References 31 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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“…Nevertheless, according to the research results of Ref. , coke was always generated quickly when the outlet bulk temperature of the fuel is higher than 1000 K. Therefore, 1000 K was qualitatively deemed as a boundary of coking region. If COT enters this region, the channels may be blocked by coke.…”

Section: Freely Distributed Parallel Minichannelsmentioning

confidence: 99%

Flow distribution of hydrocarbon fuel in parallel minichannels heat exchanger

et al. 2018

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In this article, the flow distribution of the Chinese No. 3 jet fuel in parallel minichannels heat exchanger under high temperature condition was investigated. The models of PFR and choked flow were established based on the real fluid model. The formation mechanism of flow maldistribution of the fuel in the freely distributed channels was studied. It was found that: under low heat flux, the slight flow rate deviation will be spontaneously eliminated; under high heat flux, the slight deviation of flow rate and heat flux will be enlarged and result in the channel with smaller flow rate entering the coking region. The feasibility and influence factors of the control method of flow distribution based on choked flow were discussed. The experimental results indicated that the minichannels fuel‐cooled plate with choked flow could maintain uniform flow distribution when the total fuel outlet temperature reached 1035 K. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2781–2791, 2018

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“…The temperature of hypersonic or supersonic aircrafts surface rises sharply with the increase of flight speed and cruise time, which causes serious damage to the airframe components. The endothermic hydrocarbon fuel with high heat sink value can realize regenerative cooling of aircraft, which has become a hot spot in the field of hypersonic or supersonic aircrafts around the world. − The endothermic hydrocarbon fuel is a complex hydrocarbon mixture, which usually contains many kinds of alkanes and cycloalkanes. , n -Tridecane, widely existing in jet fuel and rocket fuel, is a typical component of various endothermic hydrocarbon fuels . Isopropylcyclohexane with monocyclic structure occurs in some kinds of endothermic hydrocarbon fuel occasionally. , n -Butanol is a kind of renewable resource, which is often used as an additive to improve the oxygen cosntent of fuel. − Furthermore, the fuel containing n -butanol is also easier to be ignited because of its low autoignition temperature. , Therefore, n -butanol has potential application in the field of endothermic hydrocarbon fuel.…”

Section: Introductionmentioning

confidence: 99%

Densities and Viscosities for the Ternary System of Isopropylcyclohexane (1) + n-Tridecane (2) + n-Butanol (3) and Corresponding Binaries at T = 293.15 to 333.15 K

Lei

Dai

et al. 2020

J. Chem. Eng. Data

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It has been proven that alcohols can regulate the performance of aviation fuels. In this work, the densities (ρ) and viscosities (η) for the ternary system of isopropylcyclohexane (1) + n-tridecane (2) + n-butanol (3) and the corresponding binary systems have been measured to understand the physical properties of endothermic hydrocarbon fuel with alcohol over the whole composition range at temperatures from 293.15 to 333.15 K under atmospheric pressure (p = 0.1 MPa). The Redlich–Kister equation has been used to fit the excess molar volumes (V m E) and viscosity deviations (Δη) of binary systems, while four semiempirical equations (Singh, Cibulka, Nagata–Tamura, and Redlich–Kister) have been applied to correlate V m E and Δη of the ternary system. For all binary systems, the values of V m E are positive. The values of Δη for binary systems containing n-butanol are all negative. For the ternary system, the values of V m E are all positive and the values of Δη are all negative over the entire concentration range. All results have been interpreted with the perspective of intermolecular interaction and structural effect.

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Pyrolysis and coking of endothermic hydrocarbon fuel in regenerative cooling channel under different pressures

Cited by 77 publications

References 31 publications

Investigation on Carburization during the Repeated Coking and Decoking Process

Investigation on Carburization during the Repeated Coking and Decoking Process

Flow distribution of hydrocarbon fuel in parallel minichannels heat exchanger

Densities and Viscosities for the Ternary System of Isopropylcyclohexane (1) + n-Tridecane (2) + n-Butanol (3) and Corresponding Binaries at T = 293.15 to 333.15 K

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