Influence of Silicon and Silicon/Sulfur-Containing Additives on Coke Formation during Steam Cracking of Hydrocarbons

Wang, Jidong; Reyniers, Marie‐Françoise; Geem, Kevin Van; Marin, Guy

doi:10.1021/ie070970w

Cited by 50 publications

(82 citation statements)

References 41 publications

(137 reference statements)

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“…And it is mainly composed of (Cr, Fe)-spinel and a small amount of Fe 2 O 3 . In a carburizing atmosphere, (Cr, Fe)-spinel and iron oxide can be reduced to fine metallic particles which can act as catalysts for the formation of filamentous coke [11,12]. The influence of the cracking time on the coking rate is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The catalytic activity decreases when the metal surface is covered with coke, and the coke formation rate decreases rapidly. Meanwhile, the coke mechanism changes from catalytic coking to pyrolytic coking which has a stead-state coking rate [12,13]. Coke will grow by the reactions of gas-phase species with active sites on the coke surface.…”

Section: Resultsmentioning

confidence: 99%

“…The density of the coke is taken from reference [12], which was obtained from the measurement of coke produced during an industrial naphtha cracking. S is the surface area of the specimen (12×10 -4 m 2 ).…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Influence of coke thickness on the on-line SiO2/S coating preparation and its thermal shock property

Wang¹,

Zhou²,

Xu³

2015

Proceedings of the 2015 International Conference on Advanced Engineering Materials and Technology

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Abstract. SiO 2 /S coating was prepared on the surface of HP40 specimen with different thicknesses of coke. The influence of coke on the coating deposition and thermal shock property was studied. Scanning electron microscopy, X-ray diffractometry and X-ray energy dispersive spectroscopy were used for microstructure and microchemical analysis. The morphologies of cokes and SiO 2 /S coatings were investigated. The results show that the oxide layer of HP40 specimen formed at 850˚C for 2 hour is porous and mainly composed of (Cr, Fe)-spinel and a small amount of Fe 2 O 3 . The coking rate initially is high, then decreases with increasing cracking time, and finally reaches a stable value after 20 minutes. The diameter of coke changes from 1μm to 0.2μm, and then is about 0.5μm. The thickness of the coke layer changes from 0.56μm to 2.58μm. The thickness of coke layer has an important influence on the morphology and thermal shock property of the on-line SiO 2 /S coating. With increasing the thickness of the coke layer, the coating becomes rough and incompact. When the thickness of the coke layer is 0.56μm, the coating can bear 13 thermal shock tests. And the coating is out of service when the coke layer is 2.58μm. It is suggested that a thorough decoking should be carried out to improve the adhesion between the on-line coating and the inner surface of the cracking tube.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of coke thickness on the on-line SiO2/S coating preparation and its thermal shock property

Wang¹,

Zhou²,

Xu³

2015

Proceedings of the 2015 International Conference on Advanced Engineering Materials and Technology

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show abstract

“…A lot of effort has been made for the suppression of coke formation, including surface pretreatments (Bao et al, 2018), coatings (Tang et al, 2014;Schietekat et al, 2015) and the application of additives (Wang et al, 2008;Rahimi et al, 2014). Coating technology has been widely used in the past 30 years in steam cracking because of the low effects on the target product yields and the normal operation of a cracker, the low operational cost, though a continuous addition is needed when the additives are applied, and the good coking inhibition property.…”

Section: Introductionmentioning

confidence: 99%

PREPARATION AND SIMULATION OF THE ON-LINE SiO2/S COATING FOR COKING INHIBITION IN THE INDUSTRIAL CRACKING FURNACE

Wang

Ding

Huo

2019

Braz. J. Chem. Eng.

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Coke formation inside radiant coils is one of the main problems during thermal cracking of hydrocarbons. The on-line preparation of the coating for coking inhibition is a promising technology because it provides more flexibility to the operators on site. The SiO 2 /S coating was prepared on the inner surface of coils in an 8-year-served GK-VI industrial cracking furnace. The effects of the coating preparation process on the operation of TLE were studied. The coking rates of the tube with and without coating preparation were evaluated by the trend change of tube metal temperature. Simulations of the coating deposition process were further carried out using the computational fluid dynamics approach. The results showed that a significant temperature increase at the outlets of TLEs during coating preparation were due to the accumulation of SiO 2 and S in a loose form under the TLE operating conditions when the concentration of coating precursors was 7500 ppm (wt. %). In the three tests, coating precursors were mainly completely consumed in tubes and TLEs. For the coated tube, the run time was extended by 4-7 days because the catalytic coking was decreased. No significant changes in the distribution of products and molar yields of main products were observed. In the simulations, it was found that increasing the inlet flow rate led to a more uniform thickness and improved the mass content of sulfur in the coating. In the tube bend section, circumferential nonuniformities for the deposition were due to circumferential differences in the temperatures and mass fractions. The mass fraction of S in the coating was within the range of 0.02%-0.1%. The control step for the SiO 2 /S coating deposition was kinetic. Based on the simulation results, the optimized coating preparation parameters were determined, i.e., the inlet flow rate of 15t/h, the outlet temperature of 1093K and the inlet mass concentration of 3000 ppm (wt. %).

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“…Some coatings have been prepared in a pilot plant setup [9,10,15]. However, all the coatings were not analyzed in detail.…”

Section: Introductionmentioning

confidence: 99%

Anti-coking property of the SiO2/S coating during light naphtha steam cracking in a pilot plant setup

Zhou

Wang

Luan

et al. 2011

Journal of Analytical and Applied Pyrolysis

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Influence of Silicon and Silicon/Sulfur-Containing Additives on Coke Formation during Steam Cracking of Hydrocarbons

Cited by 50 publications

References 41 publications

Influence of coke thickness on the on-line SiO2/S coating preparation and its thermal shock property

Influence of coke thickness on the on-line SiO2/S coating preparation and its thermal shock property

PREPARATION AND SIMULATION OF THE ON-LINE SiO2/S COATING FOR COKING INHIBITION IN THE INDUSTRIAL CRACKING FURNACE

Anti-coking property of the SiO2/S coating during light naphtha steam cracking in a pilot plant setup

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