Simulation analysis of fracture process of slag deposits surrounding wall tubes during steam sootblowing

Shao, Lintao; Jian-ping, Kuang; Yang, Weijuan; Zhang, Yu; Zhou, Zhijun; Xia, Zhihong; Wang, Zhihua

doi:10.1631/jzus.a1900030

Cited by 1 publication

(3 citation statements)

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“…Therefore, the Eulerian material boundary must be computed during each time increment, and it does not correspond to an element boundary. The syngas component of high temperature and high pressure is based on the Eulerian analysis in this study 6 . The contact between the Eulerian and the Lagrangian materials is based on the penalty contact method 25 .…”

Section: Methodsmentioning

confidence: 99%

“…Sootblowing is an effective and conventional method to remove deposition and fouling on the heat transfer tubes in the coal‐fired boiler and has some applications in the RSC. The sootblowing medium can be steam, air, water, or syngas 6,7 . Deposition removal performance is manifold and dependent not only on characteristics of the deposit, such as mechanical strength, elastic (Young's) modulus, and chemical composition, but also on the operating parameters, such as sootblowing gauge pressure and RSC operating pressure.…”

Section: Introductionmentioning

confidence: 99%

“…Given that the slag deposits are assumed as brittle materials, the CZM can be used to predict the behavior of slag or deposit from the RSC through ABAQUS. However, this effective method has not been applied to simulate the deposit fracture process in the RSC to date even though our previous study simulated using the CZM and investigated the deposit fracture characteristics in coal‐fired boilers 6 . This study attempted simulation investigation by CZM of deposit fracture in the RSC.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic characteristics of deposit fracture and impacts of operating pressure during sootblowing in the radiant syngas cooler

Shao

Bai²,

Yang

et al. 2021

Asia-Pacific J Chem Eng

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During the operation of entrained‐flow gasifiers, the ash deposits located on the wall tubes in the radiant syngas coolers (RSC) reduce the heat transfer efficiency. Syngas sootblowing is an effective method to remove the slag deposits in the RSC. In this study, a 3D numerical model was developed by combining the cohesive zone method (CZM) and the coupled Eulerian–Lagrangian analysis to investigate the deposit fracture process in RSC during sootblowing. The quasi‐static analysis using ABAQUS obtained the stress–strain curve of the slag sample, which agreed well with the experimental tests and provided the detailed mechanical parameters to the CZM model. The dynamic characteristics of deposit fracture were discovered. The main fracture occurred between 1.0 and 1.5 ms, and the shape of the fracture area was not round but elliptical. The RSC operating pressure (P) was also investigated. The study found that higher pressure led to lower fracture speed, longer sootblowing time, and more syngas consumption. Based on the same extent of deposit fracture, syngas consumption increased when P < 3.5 MPa, and the density of syngas (ρsyngas) has a more significant influence on the syngas consumption than the velocity of sootblowing syngas flow (vavg), especially when the sootblowing time is small.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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