CIESC Journal ›› 2023, Vol. 74 ›› Issue (5): 1939-1949.DOI: 10.11949/0438-1157.20230140

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Effect of burner bias angle on distribution characteristics of gasifier slag layer

Bimao ZHOU1(), Shisen XU2, Xiaoxiao WANG1, Gang LIU2, Xiaoyu LI2, Yongqiang REN2, Houzhang TAN1()   

  1. 1.MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
    2.Huaneng Clean Energy Research Institute, State Key Laboratory of Coal Based Clean Energy, Beijing 102209, China
  • Received:2023-02-21 Revised:2023-05-04 Online:2023-06-29 Published:2023-05-05
  • Contact: Houzhang TAN

烧嘴偏转角度对气化炉渣层分布特性的影响

周必茂1(), 许世森2, 王肖肖1, 刘刚2, 李小宇2, 任永强2, 谭厚章1()   

  1. 1.西安交通大学热流科学与工程教育部重点实验室,陕西 西安 710049
    2.中国华能集团清洁能源技术研究院有限公司,煤基清洁能源国家重点实验室,北京 102209
  • 通讯作者: 谭厚章
  • 作者简介:周必茂(1997—),男,硕士研究生,2960474331@qq.com
  • 基金资助:
    中国华能集团有限公司科技项目(HNKJ21-H68)

Abstract:

The ash-slag ratio (the fly ash carried away by syngas to slag deposited on the wall) of the gasifier is critical to the service life of subsequent syngas cleaning equipment. Optimizing the bias angle of burners is an effective way to control the ash-slag ratio of gasifier. The effects of the bias angle of four burners in the first stage of HNCERI (Huaneng Clean Energy Research Institute) gasifier on the ash-slag ratio, slag layer and refractory material are studied by numerical simulation method. The numerical simulation results show that when the bias angle of burners increases from 0°to 4.5°, the ash-slag ratio decreases from 2.0 to 0.8, and the average residence time of liquid slag layer reduced by 31.5%. With the increase of bias angle, the thickness of liquid/solid slag layer increases at the slag tap hole. While the thickness of solid slag layer decreases and the thickness of liquid slag layer increases at H=4.45—5.07 m. The velocity of liquid slag is negatively correlated with the viscosity of the liquid slag and positively correlated with the thickness of the liquid slag. The liquid slag thickness is mainly affected by the velocity of the liquid slag and the particle deposition rate. With the increase of the bias angle, the average temperature of the refractory material surface above the burner plane increases and below the burner plane decreases. When the bias angle is 3.5°, the highest temperature of the refractory material is the lowest. On the premise of effectively reducing the ash-slag ratio, reducing the possibility of the slag block, slag layer falling off and refractory material ablation, the HNCERI gasifier burner deflection angle is recommended to be 3.5°.

Key words: gasification, viscosity, complex fluids, optimal design, ash-slag ratio, slag flow characteristics

摘要:

气化炉灰渣比(合成气携带走的飞灰与沉积至壁面的熔渣的质量比)是影响后续合成气净化设备寿命的关键因素,优化烧嘴偏转角度是控制气化炉灰渣比的有效方法。采用数值模拟方法,研究了HNCERI (Huaneng Clean Energy Research Institute)气化炉一段四烧嘴偏转角度对气化炉灰渣比、壁面渣层及耐火材料的影响。数值模拟结果表明,烧嘴偏转角度由0°增加至4.5°,灰渣比由2.0降低至0.8,液态渣层平均停留时间减少31.5%。偏转角度增加,渣口位置液/固态渣层厚度均增加;H=4.45~5.07 m位置固态渣层厚度下降,液态渣层厚度则增加。液态渣层流速与黏度呈负相关,与厚度呈正相关,液态渣层厚度主要受流速和颗粒沉积率影响。偏转角度增加,烧嘴平面上方耐火材料表面平均温度升高,烧嘴平面下方耐火材料表面平均温度降低,偏转角度为3.5°时耐火材料需要承受的最高温度取得最低值。在有效降低灰渣比前提下,为减少气化炉堵渣、渣层脱落和耐火材料烧蚀概率,HNCERI气化炉烧嘴偏转角度建议取3.5°。

关键词: 气化, 黏度, 复杂流体, 优化设计, 灰渣比, 渣层流动特性

CLC Number: