Deposition characteristics of particles in backward-facing step flow and a radiant syngas cooler

Zhang, Yan; Yang, Kai; Zhang, Xinru; Zhang, Xinxin

doi:10.1016/j.csite.2023.102799

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…The 1/8 structure is used for the analysis due to the symmetry of the RSC. The temperature of the upper cone membrane exceeds 800 K because of the recirculation zone at the inlet jet of the upper part. , The high-temperature syngas is entrained at the upper part of the RSC, which comes into contact with the upper cone membrane wall, resulting in a high-temperature area on the upper cone membrane wall. The upper part of the cylinder membrane wall is affected by the recirculation zone, which is complicated for the flow of high-temperature syngas.…”

Section: Resultsmentioning

confidence: 99%

“…Li et al analyzed the flow, heat, and mass transfer processes in the RSC after adding a water injection system, and the modified RSC improved the reliability of the gasification system. Zhang et al investigated the flow field and particle behavior in the convective backward-facing step flow region in the RSC, explaining the deposition characteristics of different particles in the recirculation zone.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of the Integral Thermal Deformation Behavior of a Radiant Syngas Cooler for an Entrained-Flow Gasifier

Zhang,

Xu,

Gong

et al. 2023

Ind. Eng. Chem. Res.

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A radiant syngas cooler (RSC) is an important device in the heat recovery type of entrained-flow gasifier that can effectively improve the energy utilization efficiency. In this work, a three-dimensional (3D) industrial RSC model is established. Heat transfer characteristics and integral thermal deformation behavior are studied by numerical simulation, combining the principle of fluid–structure coupling to explore the variation of integral thermal deformation under different operating conditions. The simulation results indicate that the setting of the radiation screen has different effects on the uneven heating of the membrane wall in the circumferential direction, varying with heights. An equivalent stress concentration area in the middle and upper parts under industrial constraints is shown on the cylinder membrane wall. The equivalent stress of the upper cone membrane wall surface exceeds the allowable stress of the material. The thermal deformation of the top sealing structure and the bottom is 45.6 mm and 64.5 mm, respectively. The upward movement of the fixed support reduces the thermal deformation of the top sealing structure while increasing the thermal deformation of the bottom. An increase in the inlet temperature causes an increase in the thermal deformation of the top sealing structure and the equivalent stress at the middle and upper parts of the cylinder membrane wall while having an insignificant impact on the thermal deformation of the bottom. The deposition of ash and slag reduces the thermal deformation of the top sealing structure and the total heat transfer rate of the cylinder membrane wall. With a slight effect on the total thermal deformation, increasing the slag thickness decreases the total heat transfer rate.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Integral Thermal Deformation Behavior of a Radiant Syngas Cooler for an Entrained-Flow Gasifier

Zhang,

Xu,

Gong

et al. 2023

Ind. Eng. Chem. Res.

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show abstract

“…In these methods the stresses and therefore, interaction forces between fluid and particles are obtained directly. In an Eulerianl-Lagrangian method, Zhang et al (2023), obtained deposition characteristics of particles in backwardfacing step flow and a radiant syngas cooler. They used k-ε model for obtaining turbulency.…”

Section: Introductionmentioning

confidence: 99%

Simulation of particles motion, deposition and loading in a channel with two built in square obstacles by Homogenized Lattice Boltzmann method

Goharrizi

2023

Preprint

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Loading of particles occurs in some industries and nature, such as slurry flow, aeolian landforms and also in filters. It can cause some difficulty in normal operation of devices and systems. Therefore, its study is necessary. In this research the motion, rolling, deposition and loading of some particle in a Poiseuille flow channel with two built in square blocks are simulated in details. For validation two neutrally buoyant particles movement were simulated and those trajectory and equilibrium positions were compared with the pervious works. A good agreement between them was observed. Next some particles at the inlet of a channel with two obstacles were released under a Poiseuille flow. The trajectory of particles specially when those are in the position near the deposition, and also those rotational angles were obtained. It is seen that when the particle collides to the blocks walls, they suddenly change the rotational direction. Also, it is seen that the particles near the deposition when trapped between the other particles continue those movements with zigzag, roundtrip, rise and fall until they stop. It is observed that the most loading of particles between two blocks occurs for particles with medium density. Also, it is seen that the particles travel the most length of their path by sliding.

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Numerical simulation of ash deposition behavior in radiant syngas cooler coupled with impact surface temperature

Zhang,

Gong,

et al. 2024

Chemical Engineering Science

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Deposition characteristics of particles in backward-facing step flow and a radiant syngas cooler

Cited by 4 publications

References 31 publications

Numerical Simulation of the Integral Thermal Deformation Behavior of a Radiant Syngas Cooler for an Entrained-Flow Gasifier

Numerical Simulation of the Integral Thermal Deformation Behavior of a Radiant Syngas Cooler for an Entrained-Flow Gasifier

Simulation of particles motion, deposition and loading in a channel with two built in square obstacles by Homogenized Lattice Boltzmann method

Numerical simulation of ash deposition behavior in radiant syngas cooler coupled with impact surface temperature

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