Experimental Study of the Inner Solid Circulation Pattern in the Multistage Riser

Zhang, Xiaolai; Wu, G.; He, Yan

doi:10.1021/acs.iecr.1c02513

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…Most studies on the riser reactor have concentrated on improving the distribution of catalyst particles by experiments. The motion trajectory of glass beads (with a mean diameter of 120 μm) was studied in a diameter-changing riser by particle image velocimetry (PIV) measurement under the conditions of different height/diameter ratios . When the height/diameter ratio was higher than 2.0, the gas–solid mixing was the most sufficient.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Hydrodynamics of the Riser Reactor for Catalytic Cracking of Crude Oil to Chemicals

Wang

Jiao

et al. 2023

Ind. Eng. Chem. Res.

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Direct catalytic cracking of crude oil to chemicals (ccCOTC) has become the development trend in the petrochemical industry. A riser is one of the key reactors in a ccCOTC process. In this work, a two-fluid model (TFM) was used to simulate a relationship between the reactor geometry and gas–solid flow in a typical riser (inside diameter of 17 mm and height of 4.5 m) established in our laboratory, with the aim of improving chemical yield and optimizing the reactor geometry in a ccCOTC process. The effects of key geometric parameters, including the angle between an oblique pipe for catalyst return and the vertical riser (α), the distance between the nozzle orifice and catalyst return oblique pipe (L), the ratio of height to diameter in the prelifting zone (H/D), and the number of catalysts returning to oblique pipes (n), on the distribution of catalyst particles and product profiles were studied. An optimized reactor geometry was proposed according to the index of gas–solid dispersion evenness. To further know the effect of the riser geometry on the product distribution, the two-fluid model (TFM) coupled with a four-lumped kinetic model was used to predict the cracking product profiles along the riser axial. It was found that the ccCOTC riser can remarkably enhance the yield of target chemicals (C2–C4 olefins, benzene, toluene, and xylene), which was approximately 3.1% higher than the result from the pilot test (using the riser before geometry optimization). This work could provide fundamental support on the design of a reactor to maximize light olefins and monocyclic aromatic hydrocarbons in the ccCOTC process.

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Section: Introductionmentioning

confidence: 99%