Quantitative measurement of particle size distributions of carbonaceous nanoparticles during ethylene pyrolysis in a laminar flow reactor

Mei, Junyu; Wang, Mengda; You, Xiaoqing; Law, Chung K.

doi:10.1016/j.combustflame.2018.11.010

Cited by 19 publications

(4 citation statements)

References 41 publications

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“…[71]. A temperature of 523 K was found optimal to minimise soot agglomeration as well as thermophoretic, adsorption and condensation losses within the system [72][73][74]. The probe-tip dilution ratio corresponds to the limit of minimum species losses during the collection process [3].…”

Section: Pah Speciesmentioning

confidence: 99%

Quantification of PAH concentrations in premixed turbulent flames crossing the soot inception limit

Shariatmadar

Hampp

Lindstedt

2021

Proceedings of the Combustion Institute

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The current study quantifies the impact of equivalence ratio and rate of strain on the spatial distribution of major species and soot precursors in premixed turbulent ethylene flames crossing the soot inception limit. A back-to-burnt (BTB) opposed jet configuration is used to provide accurate control of the turbulent and chemical timescales. The upper nozzle features fractal grid generated turbulence and premixed ethylene/air mixtures with flames stabilised against well-defined hot combustion products emerging from the lower nozzle. The study combines simultaneous PAH/CH 2 O-PLIF and elastic light scattering (ELS) with probe sampling. Gas chromatography-mass spectrometry (GC-MS) and gas chromatography-thermal conductivity detection (GC-TCD) were used to quantify concentrations of major species and poly-aromatic hydrocarbons (PAHs). The laser based diagnostics show that the rate of strain exerts a dominant impact on the growth of soot particles with low turbulent Reynolds numbers (50 ≤ Re t ≤ 94) used to promote soot formation. The probe measurements indicate that acetylene, 1-methylnaphthalene (1-MN), m/z = 154, m/z = 276 and benzo(a)pyrene correlate with soot formation and that the equivalence ratio is the controlling PAH growth parameter. It is further shown that the spatial extent of the PAH containing reaction zone exceeds three integral length scales.

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Section: Pah Speciesmentioning

confidence: 99%

Quantification of PAH concentrations in premixed turbulent flames crossing the soot inception limit

Shariatmadar

Hampp

Lindstedt

2021

Proceedings of the Combustion Institute

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“…The existence of coke damage to the oxide film was large, mainly in two aspects. (1) The cook initially grew in the cracks of Cr 2 O 3 oxide film, which promoted the expansion of cracks, and then accelerated Cr 2 O 3 spalling. (2) The thickening of the coke layer increased the carbon activity and decreased the partial pressure of oxygen, and eventually Cr 2 O 3 reacted with the coke body to form a layer of Cr 3 C 2 carbide layer (6Cr 2 O 3 +8C→4Cr 3 C 2 +9O 2 ).…”

Section: Edx Analysismentioning

confidence: 99%

“…In the 1930s, related experts developed the technology of producing ethylene by pyrolysis of petroleum and obtained a reliable pyrolysis method. The pyrolyzer is the most significant equipment in ethylene plant, where carbon chain fracture occurs in raw oil at about 900℃ [1]. The tube is the important part of the whole pyrolyzer.…”

Section: Introductionmentioning

confidence: 99%

Investigation on failure of 35Cr45Ni steel at high temperature

Yang

Han²,

Li³

et al. 2023

J. Phys.: Conf. Ser.

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The 35Cr45Ni steel with the high service temperature of about 1150°C was wildly used in ethylene pyrolysis device. However, the structure of 35Cr45Ni steel will change greatly after it was in service for a long time at high temperature. Therefore, in this paper, focusing on the 35Cr45Ni furnace tubes with different service time (0 and 6 years, i.e. original sample and failed sample), the microscopic morphology and elemental composition analysis were carried out to determine its failure behaviour. The results showed that the fracture morphology of the failed tube was mainly characterized by intergranular cracking, and there were carbides on the local surface of the crack, which was brittle cracking at low temperature. The precipitated phase in original 35Cr45Ni steel was mainly austenitic, M7C3 carbide and MC carbides. In a long-time service at 1000°C, the transformation of M7C3→M23C5 and MC(NbC)→Nb3Ni2Si occurred, and dispersed secondary M23C6 carbide was precipitated in the grain. Additionally, The NbC→Nb3Ni2Si transformation promoted the M7C3 to M23C5 process and the carbide precipitation as well as coarsening.

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“…Soot, as one of the byproducts of incomplete combustion of hydrocarbon fuels, is detrimental to both environment and human health [1][2][3]. During the past several decades, numerous experimental, theoretical and modelling efforts have been made to gain insights regarding its formation mechanism [4][5][6][7][8][9][10][11][12][13][14]. Coagulation efficiency η, which measures the sticking probability of two particles upon collisions, has been shown to be a key parameter in soot modelling studies [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%