Thermal cracking characteristics of n-decane in the rectangular and circular tubes

Lei, Zhiliang; Liu, Bin; Qin, Hui; He, Kuo; Bao, Zewei; Zhu, Quan; Li, Xiangyuan

doi:10.1016/j.cjche.2019.01.034

Cited by 17 publications

(13 citation statements)

References 23 publications

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“…The above‐mentioned parameters' effect on the reactor performance considering the coke deposition inside the reactor tube has been investigated in this study. Occurring coke formation leads to the pressure drop, 31 and a distinct reduction in reactor outlet diameter 14 happens, inevitably. Both of these phenomena are indicating factors for the thermal cracking shutdown time.…”

Section: Resultsmentioning

confidence: 99%

“…There are two main approaches, zone method and computational fluid dynamics (CFD). By these techniques, different effective key parameters, such as tube shapes, sizes, configurations, furnace dimension, burner styles, and their arrangements, fuel composition, distinct combustion, turbulence, and radiation models have been investigated 13–18 . Dedeyne et al, 19 have proposed spherical dimples inside the reactor tube in order to increase radial heat flux profile uniformity for propane thermal cracking and investigated it using CFD simulation.…”

Section: Introductionmentioning

confidence: 99%

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A comprehensive sensitivity analysis on the performance of pseudo‐steady propane thermal cracking process

Ghasemi

Gilani

Shirmohammadi

et al. 2021

Env Prog and Sustain Energy

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The propane thermal cracking reactor process is investigated in an industrial furnace with an alternative wall burner arrangement. Temperature and heat distribution of the furnace is obtained by three‐dimensional computational fluid dynamics (CFD) simulation technique using Ansys Fluent software. Ten calculation domains are adopted to decrease calculation costs. Different fuel rate ratios are selected as the main effective parameter on reactor performance. Different ratios of base fuel rate (0.0695 kg/s) have been considered. The obtained reactor tube wall temperature profile is used for a one‐dimensional pseudo‐steady reactor operation. By the proposed new arrangement, the created coke layer thickness is lower about 3 mm compared with the base case after 700 h. Meanwhile, Propane conversion is increased by 4%. Besides, reactor feed flow rate variations are considered one of the essential parameter on reactor operation. Despite surging in propylene yield after coke formation, ethylene yield decreases during the process. By increasing the fuel rate in each reactor flow rate, ethylene increased while propylene yield descended. The maximum allowable pressure drop is 2.7 bar. At 0.5ṁ fuel rate and 0.85 kg/s reactor flow rate, pressure drop, reactor lifetime, and ethylene yield are 1.23 bar, 1444 h, and 28%; respectively. In the reactor flow of 0.85 kg/s, by raising fuel rate 0.5–2ṁ ethylene yield is increased from 28% to 46.83%, while process operating time is reduced to 780 h. According to the results, 0.8–0.85 kg/s could be considered as an appropriate range for reactor feed flow rate.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comprehensive sensitivity analysis on the performance of pseudo‐steady propane thermal cracking process

Ghasemi

Gilani

Shirmohammadi

et al. 2021

Env Prog and Sustain Energy

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“…N-Decane is one of the important components of jet fuels. 13 Therefore, it is of considerable significance to study the properties of the n-decane and exo-tetrahydrodicyclopentadiene mixture.…”

Section: ■ Introductionmentioning

confidence: 99%

“…N -decane is a straight-chain alkane with 10 carbon numbers just like exo -tetrahydrodicyclopentadiene and has lower viscosity than exo -tetrahydrodicyclopentadiene. N -Decane is one of the important components of jet fuels . Therefore, it is of considerable significance to study the properties of the n -decane and exo -tetrahydrodicyclopentadiene mixture.…”

Section: Introductionmentioning

confidence: 99%

Densities and Viscosities of the Ternary System exo-Tetrahydrodicyclopentadiene (1) + n-Decane (2) + 1,2,3,4-Tetrahydronaphthalene (3) and the Corresponding Binary Systems at T = (293.15–333.15) K

Dai

Wang

et al. 2021

J. Chem. Eng. Data

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The densities (ρ) and viscosities (η) of the ternary system exo-tetrahydrodicyclopentadiene + n-decane + 1,2,3,4-tetrahydronaphthalene and the three corresponding binary systems, exo-tetrahydrodicyclopentadiene + n-decane, 1,2,3,4-tetrahydronaphthalene + n-decane, and exo-tetrahydrodicyclopentadiene + 1,2,3,4-tetrahydronaphthalene, were measured at temperatures ranging from 293.15 to 333.15 K and at pressure p = 0.1 MPa. The densities and viscosities were determined using a vibrating-tube densimeter and an automatic microviscometer based on the rolling ball principle, respectively. The values of excess molar volumes (V m E) and the viscosity deviations (Δη) of every mixture were calculated with the measured data. The V m E and Δη values of the three binary systems and the ternary system were fitted to the Redlich–Kister equation and four semi-empirical equations, respectively. The V m E values are negative for the binary systems of exo-tetrahydrodicyclopentadiene + n-decane and 1,2,3,4-tetrahydronaphthalene + n-decane with the minimum at about x = 0.5, while the V m E value of the binary system exo-tetrahydrodicyclopentadiene + 1,2,3,4-tetrahydronaphthalene is positive with the maximum at x = 0.5. The Δη values of the three binary systems are negative over the entire concentration range. For the ternary system, the V m E values are positive when exo-tetrahydrodicyclopentadiene and 1,2,3,4-tetrahydronaphthalene are dominant. Otherwise, the V m E values turn out to be negative. The Δη values are negative over the entire concentration range. These phenomena can be explained by physical interactions and structural effects between components.

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“…Thermal cracking would occur when the temperature of endothermic hydrocarbon fuel is pretty high, which would influence the flow and heat transfer [20]. According to Lei et al [21], the cooling capacity can be promoted by thermal cracking, which is beneficial for the thermal protection. Therefore, the flow and heat transfer of endothermic hydrocarbon fuels with thermal pyrolysis was extensively studied.…”

Section: Introductionmentioning

confidence: 99%

A Parametrical Study on Convective Heat Transfer between High-Temperature Gas and Regenerative Cooling Panel

Wang

Zhang

et al. 2021

Energies

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Thermal protection is still one of the key challenges for successful scramjet operations. In this study, the three-dimensional coupled heat transfer between high-temperature gas and regenerative cooling panel with kerosene of supercritical pressure flowing in the cooling channels was numerically investigated to reveal the fundamental characteristics of regenerative cooling as well as its influencing factors. The SST k-ω turbulence model with low-Reynolds-number correction provided by the pressure-based solver of Fluent 19.2 is adopted for simulation. It was found that the heat flux of the gas heated surface is in the order of 106 W/m2, and it declines along the flow direction of gas due to the development of boundary layer. Compared with cocurrent flow, the temperature peak of the gas heated surface in counter flow is much higher. The temperature and heat flux of the gas heated surface both rises with the static pressure and total temperature of gas. The heat flux of the gas heated surface increases with the mass flow rate of kerosene, and it hardly changes with the pressure of kerosene. Results herein could help to understand the real heat transfer process of regenerative cooling and guide the design of thermal protection systems.

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Thermal cracking characteristics of n-decane in the rectangular and circular tubes

Cited by 17 publications

References 23 publications

A comprehensive sensitivity analysis on the performance of pseudo‐steady propane thermal cracking process

A comprehensive sensitivity analysis on the performance of pseudo‐steady propane thermal cracking process

Densities and Viscosities of the Ternary System exo-Tetrahydrodicyclopentadiene (1) + n-Decane (2) + 1,2,3,4-Tetrahydronaphthalene (3) and the Corresponding Binary Systems at T = (293.15–333.15) K

A Parametrical Study on Convective Heat Transfer between High-Temperature Gas and Regenerative Cooling Panel

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