Thermal Fouling of Heat Exchanger Tubes due to Heavy Hydrocarbon Droplets Impingement

Verhees, Pieter; Mahulkar, Amit V.; Heynderickx, Geraldine

doi:10.1080/01457632.2016.1206412

Cited by 4 publications

(2 citation statements)

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“…Unevaporated hydrocarbons become attached to the surface, and then, through chemical reactions at high temperature, form fouling deposits. 27,48 The total measured mass of convection section deposits corresponds to only 0.0982 wt % of the feedstock fed during the experiment. Even though low, this value is regarded as alarming considering that conventionally designed steam cracker convection section cannot be decoked without complete furnace shutdown.…”

Section: Resultsmentioning

confidence: 99%

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Crude to Olefins: Effect of Feedstock Composition on Coke Formation in a Bench-Scale Steam Cracking Furnace

Geerts

Ristic

Djokic

et al. 2020

Ind. Eng. Chem. Res.

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A novel experimental unit has been designed, allowing the examination of the fouling tendency in all relevant sections of a steam cracking furnace, that is, dry feed preheater (DFP), dilute feed preheater I & II (DFPH I & II), radiant section, and transfer line exchanger in a single experiment, using among others an electrobalance. Large differences in coke deposition have been observed in each of these sections when cracking a wide range gas oil (WRGO) and a naphtha fraction (NF). WRGO results in fouling rates which are 20, 86, 253, and 10 times higher in the DFP, DFPH I, DFPH II, and transfer line heat exchanger sections compared to the NF, whereas the fouling rate in the radiant section is 56% lower. The standard deviations are 13, 18, and 7% for DFP, DFPH I, and DFPH II, respectively. Online effluent analysis reveals that significantly less valuable olefins and more Pygas and pyrolysis fuel oil (PFO) are formed during WRGO cracking compared to NF cracking, that is, 16.2 wt % versus 21.9 wt % ethylene, 12.1 wt % versus 14.1 wt % propylene, 24.8 wt % versus 19.6 wt % Pygas, and 14.1 wt % versus 11.3 wt % PFO. This unit can thus provide vital information to develop single step crude to olefin process by examining possible heavy feedstocks.

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Section: Resultsmentioning

confidence: 99%

“…Therefore, incomplete evaporation of the feedstock could be the first step toward fouling deposit formation in this experiment. Unevaporated hydrocarbons become attached to the surface, and then, through chemical reactions at high temperature, form fouling deposits. , …”

Section: Resultsmentioning

confidence: 99%