CFD modeling of ash deposition distribution in an industrial radiant syngas cooler to enhance the operation performance

Wang, Bo; Guo, Qinghua; Gong, Yan; Xu, Jianliang; Yu, Guangsuo

doi:10.1016/j.cep.2022.109083

Cited by 3 publications

(3 citation statements)

References 39 publications

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“…The impact surface between adjacent tubes exhibits axial guiding characteristics, resulting in a distinct flow field compared to planar impact jets. The radiation screen is positioned proximity to the central flow channel in RSC which leads to thicker and stronger adhered deposit than circumferential membrane wall . Therefore, in order to achieve efficient sootblowing in the RSC, the dynamic pressure of the sootblowing jet should be more than 5000 Pa on the radiation screen and 1000 Pa on the circumferential membrane wall.…”

Section: Resultsmentioning

confidence: 99%

“…The radiation screen is positioned proximity to the central flow channel in RSC which leads to thicker and stronger adhered deposit than circumferential membrane wall. 34 Therefore, in order to achieve efficient sootblowing in the RSC, the dynamic pressure of the sootblowing jet should be more than 5000 Pa on the radiation screen and 1000 Pa on the circumferential membrane wall. It is essential to investigate the flow characteristics near the wall surface of the membrane walls to determine the appropriate sootblowing parameters.…”

Section: Sootblowing Flow Field Characteristics With Water Wallmentioning

confidence: 99%

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Optimization of a Sootblowing System for Effective Deposit Removal in Radiant Syngas Cooler Using Numerical Simulation

Xia,

Gong,

Guo

et al. 2024

Ind. Eng. Chem. Res.

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The radiant syngas cooler (RSC) absorbs heat and generates steam, which is an indispensable part of the entrained-flow gasification system. The fly ash particles and molten slag adhere to the membrane wall of the RSC, resulting in an increasing thermal resistance of the membrane wall and a decreasing efficiency of the gasification system. The impact force of high-pressure airflow from the sootblowers can remove ash and slag deposits. In this study, a two-dimensional model of sootblowing without an impact wall surface and a three-dimensional model of water wall tubes in the industrial-scale RSC for a 2000 t/d entrained-flow coal gasifier are established. The effects of impingement angle, distance, and pneumatic supply pressure of sootblowers are numerically investigated to improve the sootblowing efficiency. The sootblowing gas flow characteristics and deposit removal performance analysis are studied as well. The results show that the core region of the sootblowing jet is located at a distance of 42 mm from the nozzle, exhibiting a jet velocity of 340 m/s under basic operating conditions. The effective impact distance range is insufficient when the pneumatic supply pressure is below 6.8 MPa. The effective sootblowing region reaches the largest area when the sootblowing angle is 30°and the sootblowing distance is 110 mm for radiation screens. The practical installation of sootblowers would be more optimal by selecting a smaller impact angle which can enhance the efficiency in a sootblowing system. The shorter sootblowing distance is suitable for removing high strength deposits, but it is not conducive to overall removal of ash and slag. The effective sootblowing area increases from 29.3 to 355.0 cm 2 when the pneumatic supply pressure of the sootblower is raised from 6.9 to 8.1 MPa.

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Section: Resultsmentioning

confidence: 99%

Section: Sootblowing Flow Field Characteristics With Water Wallmentioning

confidence: 99%

Optimization of a Sootblowing System for Effective Deposit Removal in Radiant Syngas Cooler Using Numerical Simulation

Xia,

Gong,

Guo

et al. 2024

Ind. Eng. Chem. Res.

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“…The difference is that molten particles' cooling and curing effects when they hit the wall were also considered. Wang et al [10] numerically studied the ash particles' movement and deposition in the one-cylinder type of RSC and quantitative predicted the deposited ash amount.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Deposition Characteristics in the Initial Deposition Stage in RSC

Zhang

Yang

Zhang

et al. 2023

J. Phys.: Conf. Ser.

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The coal gasification syngas cooler is important for recovering the sensible heat generated during coal gasification. The ash layer formed on the heat transfer surface can seriously decrease the heat exchange efficiency. Establishing the initial layer is a prerequisite for massive ash deposition and will accelerate the accumulation of the ash and slag particles. In this study, numerical simulations are conducted to analyze the behavior of ash particles in large-scale industrial equipment. The deposition characteristics during the initial fouling and slagging stage in RSC are explored. The results show that in this stage, ash or slag particles mainly stick on the side wall, and only small particles deposit on the upper cone. The surface energy is the dominant factor influencing the composition of the initial layer. The adhesion ratio of FeS2 and ZnS particles is over ten times higher than that of SiO2 particles. With the decrease of the inlet flow rate and the increase of the inlet swirl velocity, the location corresponding to the maximum deposition proportion moves upward, and the local maximum deposition proportion increases.

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

Zhang

Yang

Zhang

et al. 2023

Case Studies in Thermal Engineering

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CFD modeling of ash deposition distribution in an industrial radiant syngas cooler to enhance the operation performance

Cited by 3 publications

References 39 publications

Optimization of a Sootblowing System for Effective Deposit Removal in Radiant Syngas Cooler Using Numerical Simulation

Optimization of a Sootblowing System for Effective Deposit Removal in Radiant Syngas Cooler Using Numerical Simulation

Numerical Analysis of the Deposition Characteristics in the Initial Deposition Stage in RSC

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

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