Abstract
The influence of the SiO2/S coating+sulfur/phosphorus-containing inhibitor on coke formation on the surface of HP40 cracking tube after 8years of service was evaluated at 850°C during thermal cracking of light naphtha. The surface morphology of HP40 alloy specimen after 8years of service was characterized by scanning electron microscope (SEM), energy dispersive spectrometry (EDS), and X-ray diffraction (XRD). The morphologies and structures of cokes were studied by SEM and Raman spectra. The results were compared with those of adding sulfur/phosphorus-containing coking inhibitor only and the blank run. Compared with the blank run, the amount of coke is decreased by about 69% by adding 200ppm sulfur/phosphorus-containing coking inhibitor only. However, the amount of coke is decreased by about 96% for the SiO2/S coating+50ppm sulfur/phosphorus-containing coking inhibitor. The surface of HP40 specimen is fully covered by the filamentous coke for the blank run, and the filamentous coke forms around microcracks using 200ppm sulfur/phosphorus-containing coking inhibitor only. However, a small amount of granular coke is formed using 50ppm sulfur/phosphorus-containing coking inhibitor+the SiO2/S coating. Meanwhile, the coke includes more amorphous coke according to SEM analyses and Raman spectra.
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