Thermal cracking of recycled hydrocarbon gas-mixtures for re-pyrolysis: Operational analysis of some industrial furnaces

Gál, Tivadar; Lakatos, Béla G.

doi:10.1016/j.applthermaleng.2007.03.020

Cited by 7 publications

(7 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In modern reactors, the residence time is controlled by the tube diameter and reactor flow rate, and they have a residence time of 0.08-0.25 s. A lower residence time could be obtained by decreasing the tube diameter. Gál and Lakatos [44] reported that the conversion of n-butane was increased by increasing the residence time from 0.3 s to 0.65 s and 1.1 s (Figure 10a). The same trend was also observed for the ethylene yield, and compared with the yield at a residence time of 0.3 s, it was 7% and 11.1% higher at the residence times of 0.65 s and 1.1 S, respectively.…”

Section: Residence Timementioning

confidence: 96%

“…It has been reported that both radical reactions and molecular secondary reactions are involved in the reaction; however, in a higher-temperature reaction (above 750 • C), the molecular reactions are the dominant reactions. Gál and Lakatos [44] studied the effect of coil outlet temperature (COT) on the product yields and variation in the coke formation rate, using natural gas as a feedstock for the steam cracking process. They reported that by increasing the COT from 830 • C to 845 • C, the ethylene yield increased from 30% to 35%, and increasing the temperature above 845 • C did not cause a considerable increase in the yield (Figure 9a).…”

Section: Temperaturementioning

confidence: 99%

“…It is important to have an optimum ratio of steam to hydrocarbon to avoid negative effects on product yields and reduce the specific energy consumption of the production unit. The influence of the steam-to-hydrocarbon ratio in the steam cracking of natural gas was studied by Gál and Lakatos [44], and the basic value for ST:HC was considered to be 0.5 in that study. Their results (Table 5) showed that reducing the ST:HC ratio up to 10% did not significantly affect the product yields, but a shorter reaction time was expected due to the higher coke formation.…”

Section: Steam-to-hydrocarbon Ratiomentioning

confidence: 99%

“…Table 5. Effect of the steam-to-hydrocarbon ratio on the product yields [44]. The product distribution in the thermal cracking of atmospheric gas oil at 800 • C and a residence time of 0.4 s was studied by Abghari et al [52].…”

Section: Steam-to-hydrocarbon Ratiomentioning

confidence: 99%

See 3 more Smart Citations

A Review on the Production of Light Olefins Using Steam Cracking of Hydrocarbons

Gholami

Tišler

et al. 2021

Energies

View full text Add to dashboard Cite

Light olefins are the main building blocks used in the petrochemical and chemical industries for the production of different components such as polymers, synthetic fibers, rubbers, and plastic materials. Currently, steam cracking of hydrocarbons is the main technology for the production of light olefins. In steam cracking, the pyrolysis of feedstocks occurs in the cracking furnace, where hydrocarbon feed and steam are first mixed and preheated in the convection section and then enter the furnace radiation section to crack to the desired products. This paper summarizes olefin production via the steam cracking process; and the reaction mechanism and cracking furnace are also discussed. The effect of different operating parameters, including temperature, residence time, feedstock composition, and the steam-to-hydrocarbon ratio, are also reviewed.

show abstract

Section: Residence Timementioning

confidence: 96%

Section: Temperaturementioning

confidence: 99%

Section: Steam-to-hydrocarbon Ratiomentioning

confidence: 99%

Section: Steam-to-hydrocarbon Ratiomentioning

confidence: 99%

See 2 more Smart Citations

A Review on the Production of Light Olefins Using Steam Cracking of Hydrocarbons

Gholami

Tišler

et al. 2021

Energies

View full text Add to dashboard Cite

show abstract

“…The results were suitable to predict coke formation inside heater tubes. The thermal cracking of recycled hydrocarbon gas-mixtures for repyrolysis was studied by Gál and Lakatos (2008) using a mechanistic kinetic model containing 233 individual reactions. Furthermore, a three-dimensional two-phase flow-reaction simulation was carried out based on a two-fluid model and an 11-lump kinetic model.…”

Section: Coupled Simulation Of Mechanistic Kinetic Model and Transfermentioning

confidence: 99%

Progress in kinetic predictions for complex reaction of hydrocarbons: from mechanism studies to industrial applications

Shi

Tan

Sun

2016

Reviews in Chemical Engineering

View full text Add to dashboard Cite

AbstractKinetic predictions for complex reaction systems of hydrocarbons are theoretically and technologically crucial to the petrochemical industry. Among several proposed kinetic models, a lumping kinetic model is a comparatively simple and developed method wherein a complex system is lumped into several pseudo-components. To acquire more accurate mechanistic information, kinetic models at the mechanistic level are developed, such as single-event kinetic and structure-oriented models. However, the number of kinetic parameters increases exponentially in these methods. Lumping kinetic methods are then reexamined, and kinetic models, such as relumping single-event kinetic methods, bimolecular methods, and special pseudo-component methods, are proposed to simplify the reaction system. Many mathematical methods, such as annealing algorithm or artificial neural networks, have also been developed to solve these complex reaction problems. Although a number of complex intrinsic reaction studies have been introduced, the combination of excellent prediction performances and practical industrial applicability remains a central challenge facing this field. This situation motivated this study, to review the recent development of reaction prediction models and their application in industrial processes. Furthermore, the practical applications of these possible pathways of kinetic predictions for mechanistic studies are addressed.

show abstract

Coupled simulation of the flue gas and process gas side of a steam cracker convection section

2009

View full text Add to dashboard Cite

A coupled simulation of the flue gas and process gas side of the convection section of a steam cracker is performed, making use of the CFD software package Fluent. A detailed overview of the operating mode of the different heat exchangers suspended in the convection section is obtained. The asymmetric inlet flow field of the flue gas in the convection section, and the radiation from the convection section walls leads to large differences in outlet temperatures of the tubes located in the same row. The flow fields and temperature fields in the tubes of a single heat exchanger differ significantly with e.g., outlet temperatures of the hydrocarbon-steam mixture ranging from 820 K to 852 K. Moreover, the simulations reveal the presence of hot spots on the lowest tube row, possibly causing fouling. V

show abstract

Thermal cracking of recycled hydrocarbon gas-mixtures for re-pyrolysis: Operational analysis of some industrial furnaces

Cited by 7 publications

References 11 publications

A Review on the Production of Light Olefins Using Steam Cracking of Hydrocarbons

A Review on the Production of Light Olefins Using Steam Cracking of Hydrocarbons

Progress in kinetic predictions for complex reaction of hydrocarbons: from mechanism studies to industrial applications

Coupled simulation of the flue gas and process gas side of a steam cracker convection section

Contact Info

Product

Resources

About