张国钰,许建良,龚岩,等. 辐射废锅内辐射屏水冷管热变形数值模拟研究[J]. 煤炭学报,2023,48(12):1−9. doi: 10.13225/j.cnki.jccs.2023.0112
引用本文: 张国钰,许建良,龚岩,等. 辐射废锅内辐射屏水冷管热变形数值模拟研究[J]. 煤炭学报,2023,48(12):1−9. doi: 10.13225/j.cnki.jccs.2023.0112
ZHANG Guoyu,XU Jianliang,GONG Yan,et al. Numerical simulation on thermal deformation of water-cooling pipe for radiation screen in radiant syngas cooler[J]. Journal of China Coal Society,2023,48(12):1−9. doi: 10.13225/j.cnki.jccs.2023.0112
Citation: ZHANG Guoyu,XU Jianliang,GONG Yan,et al. Numerical simulation on thermal deformation of water-cooling pipe for radiation screen in radiant syngas cooler[J]. Journal of China Coal Society,2023,48(12):1−9. doi: 10.13225/j.cnki.jccs.2023.0112

辐射废锅内辐射屏水冷管热变形数值模拟研究

Numerical simulation on thermal deformation of water-cooling pipe for radiation screen in radiant syngas cooler

  • 摘要: 煤气化技术是煤炭清洁高效利用的有效途径,其中带辐射废锅的气流床气化工艺能够有效回收高温合成气显热,提高能源利用率。辐射废锅内部增设辐射屏水冷管,可在保持辐射废锅水冷壁整体结构紧凑的同时提高传热面积。为研究气化炉操作条件下辐射废锅内辐射屏水冷管的热变形,笔者利用流体−结构耦合原理建立三维辐射屏模型进行模拟分析。模拟结果表明:在正常操作工况下,水冷管整体在距顶部5.30 m处温度达到最大值。在周向方向上,最靠近炉膛中心的1号水冷管表面温度成抛物线形分布,向火侧中间位置温度最高,向火侧和背侧最大温差达到60 K;在相邻水冷管的冷却作用下,2−5号水冷管表面温度成双峰状分布。水冷管的空间布置直接影响水冷管表面的温度分布。未加固定的辐射屏水冷管中最靠近炉膛中心的1号水冷管局部变形量最大为5.20 cm,π方向的最大偏移量为4.58 cm,超过相邻水冷管的间距,水冷管之间易发生碰撞。水冷管间增加固定后,水冷管发生整体变形,最大热变形量为3.28 cm,较未加固定的减小36.9%,π方向的相对偏移基本消失,水冷管之间的局部变形远小于管间距。增加固定可有效避免水冷管之间的碰撞。进口合成气温度和表面沉积的变化不同程度影响水冷管表面温度梯度和变形量,偏移方向均为水冷管的π/2侧。

     

    Abstract: Coal gasification technology is an effective way to the clean and efficient utilization of coal, the entrained-flow gasification process with radiant syngas cooler (RSC) can effectively recover the sensible heat from high temperature syngas and improve energy utilization rate. The radiation screen adopted inside the RSC is not only keeping the overall structure compact, but improving the heat transfer area greatly. In order to study the thermal deformation of the radiation screen in the RSC under gasification operating conditions, a three-dimensional radiation screen model is established by using the fluid-structure coupling principle to simulation analysis. The simulation results show that under normal operating conditions, the temperature of the whole water-cooling pipe reaches the maximum value at 5.30 m from the top. In the circumferential direction, the surface temperature of the pipe 1 closest to the center of the RSC is parabola distribution. Temperature in the middle of the fire-facing side is the highest, and the maximum temperature difference between the fire-facing side and its back side reaches 60 K. Due to the cooling action of adjacent water-cooling pipe, the surface temperature of pipe 2-5 becomes bimodal distribution. The spatial arrangement has direct effect on the surface temperature distribution of water-cooling pipe. The local deformation of pipe 1 closest to the center of the RSC in water-cooling pipe without fixed is the largest, which is 5.20 cm. Maximum offset in π direction is 4.58 cm, far exceeding the pitch of water-cooling pipes, and the collision between water-cooling pipes is prone to occur. The overall deformation arises after water-cooling pipe is fixed. Maximum thermal deformation of water-cooling pipe with fixed is 3.28 cm, which is 36.9% lower than that of water-cooling pipe without fixed. The relative shift in the π direction basically disappears. Local deformation between the water-cooling pipe is smaller than the distance between the pipes. The occurrence of collision between water-cooling pipes is disappeared for the fixed action of the fixture. The changes of inlet syngas temperature and surface deposition affect the surface temperature gradient and deformation of water-cooling pipe with varying degrees, the offset direction is π/2 side of the water-cooling pipe.

     

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