The effect of temperature and pressure on n-heptane thermal cracking in regenerative cooling channel

Wu, Yong; Wang, Xiaohan; Song, Qianshi; Zhao, Luoguang; Su, Hang; Li, Haohan; Zeng, Xiaojun; Zhao, Daiqing; Xu, Jinliang

doi:10.1016/j.combustflame.2018.04.036

Cited by 33 publications

(20 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of experimental study of pyrolysis of n ‐heptane are partly summarized in the reviews . Processes were studied in a flow reactor when the reagent was diluted with nitrogen, argon, water vapor, and without dilution with a carrier gas; as well as processes in the shock tube . It was found that decomposition of n ‐heptane under the action of temperature is a radical‐chain process and is described by the Kosyakov‐Rice mechanism with additions .…”

Section: Resultsmentioning

confidence: 99%

“…It was found that decomposition of n ‐heptane under the action of temperature is a radical‐chain process and is described by the Kosyakov‐Rice mechanism with additions . The main products of pyrolysis of n ‐heptane are hydrogen, methane, ethylene, ethane, propylene . α ‐olefins C4‐C6 (butene‐1, pentene‐1, hexene‐1) are also always present in the product mixture, the first of them at moderate temperatures and small degrees of conversion belongs to the main products.…”

Section: Resultsmentioning

confidence: 99%

“…As the pressure increases, the rate constant of n ‐heptane decomposition increases and the selectivity of products changes due to the faster growth of the rates of bimolecular processes, such as the detachment of the H atom leading to the formation of alkanes, as compared to monomolecular reactions such as the breakdown of radicals, leading to the formation of ethylene . As a result, the selectivity of the formation of hydrogen and ethylene decreases, the formation of n ‐alkanes, starting from ethane, and α‐olefins increases . Increase in the temperature leads to increase in the selectivity of the formation of light products, especially methane, ethylene, hydrogen .…”

Section: Resultsmentioning

confidence: 99%

“…As a result, the selectivity of the formation of hydrogen and ethylene decreases, the formation of n ‐alkanes, starting from ethane, and α‐olefins increases . Increase in the temperature leads to increase in the selectivity of the formation of light products, especially methane, ethylene, hydrogen . With a further increase in temperature to 1300 K or more, new products appear, such as acetylene, methyl acetylene, allene, vinyl acetylene, pentadiene‐1,3 isomers, hexadiene‐1,5, benzene …”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Microwave discharge in liquid n‐heptane with and without bubble flow of argon

Averin

Билера

Lebedev

et al. 2019

Plasma Processes & Polymers

View full text Add to dashboard Cite

Emission spectra and gas products of microwave discharge in liquid n‐heptane with and without argon bubbling (6–40 l h−1) are investigated. The discharge was excited in a system with a coaxial input of energy. The pressure above the surface of the liquid was equal to atmospheric pressure. It is shown that the addition of argon changes the spectral composition of the plasma radiation, in which the emission of hydrogen and argon atomic lines appears. The addition of argon does not affect the rotational and vibrational temperatures of the state C2true(d3normalΠgtrue), the composition and the ratio of the main gas products (H2, CH4, C2H2, C2H4).

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Microwave discharge in liquid n‐heptane with and without bubble flow of argon

Averin

Билера

Lebedev

et al. 2019

Plasma Processes & Polymers

View full text Add to dashboard Cite

show abstract

“…It is well known that the flame centerline temperature varies with the total heat release rate (depends on MLR) and ambient pressure at different heights . Take the experiments at 6 kPa/min during pressurization and depressurization as examples in Figure .…”

Section: Results and Conclusionmentioning

confidence: 99%

Effects of static pressure, pressurization, and depressurization on n‐heptane pool fires in an airplane cargo compartment

Yang

Yao

et al. 2019

Fire and Materials

View full text Add to dashboard Cite

Summary The cargo compartment of an airplane in flight is a complex environment with dynamic pressure (pressurization and depressurization), nonconservative oxygen, and unidirectional ventilation. In this study, n‐heptane pool fires were performed under static pressure, pressurization, and depressurization in a full‐scale airplane cargo compartment. The static pressure included 30 and 90 kPa, the pressurization was from 30 to 90 kPa at rates of 6, 12, 19, and 25 kPa/min, while the depressurization was from 90 to 30 kPa at rates of 6, 12, 17, and 20 kPa/min. The effects of pressure, oxygen concentration, and ventilation on pool fire characteristics including fuel mass loss rate (MLR), flame centerline temperature, and flame shape under each condition were concluded. The results show that the predominant factor of MLR was different in three conditions. The flame is divided into four regimes, in which the fuel vapor regime is used to emphasize the influence of fuel vapor on flame temperature above the fuel surface. The concept of average flame shape is put forward to reflect the flame occurrence probability. And its bottom, which named average flame root, presents the negative correlation with compartment pressure.

show abstract