A physical and chemical examination of an ethylene steam cracker coke and of the underlying pyrolysis tube

Bennett, M. J.; Price, J. B.

doi:10.1007/bf00552071

Cited by 68 publications

(66 citation statements)

References 6 publications

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“…In the same way, reasons for the difference between rates for the steels at 982°C and their similarity at 1080°C attract attention. It has long been known [1][2][3] that heat resisting steels, which invariably contain small but significant amounts of silicon, develop a thin, siliconrich oxide layer beneath their chromia scales. This layer is thought to be important in slowing the rate of chromia scale growth by acting as a partial barrier to diffusion.…”

Section: Oxidationmentioning

confidence: 99%

“…In purely oxidising conditions [1][2][3], the alloys form duplex scales of chromia overlaid by manganese-rich spinel. A silicon-rich sublayer can also develop at the scale-alloy interface [1][2][3][4][5]. The limited information available [6,7] for the simultaneous attack on these alloys by both carbon and oxygen indicates that similar reaction products are formed.…”

Section: Introductionmentioning

confidence: 99%

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High temperature corrosion of cast heat resisting steels in CO+CO2 gas mixtures

Xu¹,

Monceau²,

Young³

et al. 2008

Corrosion Science

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. b s t r a c tTwo commercial variants of the cast heat resistant grade HP40Nb (Fe-25Cr-35Ni, Nb modified) were exposed to CO/CO 2 gases at 982 and 1080°C in order to simulate exposure to the carbon and oxygen potentials realised in steam reformers under normal and overheated conditions. Both alloys developed external chromium-rich oxide scales, intradendritic silica precipitates and interdendritic oxide protrusions where primary, interdendritic carbides were oxidised in situ. Surprisingly, the lower silicon content alloy developed a more continuous internal silica layer, thereby slowing external scaling. Intradendritic oxidation was fast in both alloys, and is attributed to interfacial oxygen diffusion. Both alloys underwent rapid internal carburisation, indicating that their oxide scales failed to prevent carbon access to the underlying alloys under these reaction conditions.

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Section: Oxidationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High temperature corrosion of cast heat resisting steels in CO+CO2 gas mixtures

Xu¹,

Monceau²,

Young³

et al. 2008

Corrosion Science

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show abstract

“…in chemical or nuclear plant [1][2][3]. A number of reviews and proposed mechanisms have been published [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Temperature and Carbonyl Sulphide on Carbon Deposition on 20Cr25Ni Stainless Steel

et al. 2017

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In this paper, the results of a systematic study of the effect of temperature and COS concentration on the formation of carbon deposits on a 20Cr25Ni austenitic stainless steel under a depositing gas of 1000 vppm ethene in 1%CO/CO 2 have been presented. Carbon deposits were found over the temperature range of 550-725°C after 4 h exposure. COS additions to the ethene-bearing gas inhibited 123Oxid Met (2017) 87:667-678 DOI 10.1007 the deposition process, but the effect was concentration and temperature dependent. The results have been interpreted in terms of the oxidation process and the adsorption of sulphur on the catalytic Ni-rich particles.

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“…Alloy microstructures consist mainly of austenite dendrites and primary, interdendritic, chromium-rich carbide, M 23 C 6 . In the case of niobium-modified compositions, NbC is also present.…”

Section: Introductionmentioning

confidence: 99%

Subsurface microstructural changes in a cast heat resisting alloy caused by high temperature corrosion

Oquab

Monceau

et al. 2010

Corrosion Science

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author -deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 3807 b s t r a c tA cast HP ModNb alloy (Fe-25Cr-35Ni-1Nb, wt.%) was oxidised and carburised in CO-CO 2 corresponding to a C = 0.1 and p O 2 = 3 Â 10 À16 atm at 1080°C. Formation of an external, chromium-rich oxide scale led to depletion of this metal in a deep alloy subsurface zone. Within that zone, secondary chromium-rich carbides dissolved, primary carbides oxidised, solute silicon and aluminium internally oxidised, and extensive porosity developed. Pore volumes correspond to the difference between metal loss by scaling and metal displacement by internal oxidation, assuming the scale-metal interface to be fixed. The pores are concluded to be Kirkendall voids.

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A physical and chemical examination of an ethylene steam cracker coke and of the underlying pyrolysis tube

Cited by 68 publications

References 6 publications

High temperature corrosion of cast heat resisting steels in CO+CO2 gas mixtures

High temperature corrosion of cast heat resisting steels in CO+CO2 gas mixtures

The Effect of Temperature and Carbonyl Sulphide on Carbon Deposition on 20Cr25Ni Stainless Steel

Subsurface microstructural changes in a cast heat resisting alloy caused by high temperature corrosion

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