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 (ρ_syngas) has a more significant influence on the syngas consumption than the velocity of sootblowing syngas flow (v_avg), especially when the sootblowing time is small.

中文翻译：

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辐射式合成气冷却器中吹灰过程中沉积物断裂的动态特性和工作压力的影响

在气流床气化炉的运行过程中，位于辐射式合成气冷却器（RSC）的壁管上的灰烬沉积会降低传热效率。合成气吹灰是去除RSC中炉渣沉积物的有效方法。在这项研究中，通过结合内聚区法（CZM）和耦合的欧拉-拉格朗日分析法开发了3D数值模型，以研究吹灰过程中RSC中的沉积物破裂过程。使用ABAQUS的准静态分析获得了炉渣样品的应力-应变曲线，与实验测试吻合得很好，并为CZM模型提供了详细的力学参数。发现了沉积物断裂的动力学特征。主要骨折发生在1.0至1.5 ms之间，骨折部位的形状不是圆形而是椭圆形。P）也进行了研究。研究发现，较高的压力导致较低的断裂速度，更长的吹灰时间和更多的合成气消耗。基于存款断裂的程度相同，合成气消耗增加时P <3.5兆帕，和合成气的密度（ρ_合成气）对合成气的消耗比吹灰合成气的速度更显著影响流动（v_平均），尤其是当吹灰时间短。