Nozzle structure improvement and study of particles agglomeration during liquid injection

Ning YANG; Yunlong ZHOU; Shusheng MA

doi:10.11949/0438-1157.20190138

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Nozzle structure improvement and study of particles agglomeration during liquid injection

Fluid dynamics and transport phenomena | 更新时间：2020-06-24

- Nozzle structure improvement and study of particles agglomeration during liquid injection
- CIESC Journal Vol. 70, Issue S2, Pages: 169-180(2019)
- 作者机构：
  
  1.东北电力大学能源与动力工程学院，吉林省吉林市 132012
  2.多能源互补高效供能管理技术国家地方联合工程实验室，吉林省吉林市 132012
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190138
  CLC： TK 121
- Received：21 February 2019，
  
  Revised：2019-04-08，
  
  Published：05 September 2019
- 稿件说明：
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杨宁, 周云龙, 马书生. 喷嘴结构改进及其液体射流过程颗粒团聚研究[J]. 化工学报, 2019, 70(S2): 169-180

YANG Ning, ZHOU Yunlong, MA Shusheng. Nozzle structure improvement and study of particles agglomeration during liquid injection[J]. CIESC Journal, 2019, 70(S2): 169-180
杨宁, 周云龙, 马书生. 喷嘴结构改进及其液体射流过程颗粒团聚研究[J]. 化工学报, 2019, 70(S2): 169-180 DOI： 10.11949/0438-1157.20190138.

YANG Ning, ZHOU Yunlong, MA Shusheng. Nozzle structure improvement and study of particles agglomeration during liquid injection[J]. CIESC Journal, 2019, 70(S2): 169-180 DOI： 10.11949/0438-1157.20190138.

摘要

在重质原料液的射流阶段降低反应温度会导致液体呈现不同的黏度，促使颗粒聚集形成不同尺寸的团聚结构，阻碍了原料液的热量传递，减缓了裂化反应的速率，颗粒团聚是流体焦化反应工艺面临的一个重要而又具有挑战性的问题。选用水-沙系统模拟热态沥青-焦炭系统，利用气罩装置改进喷嘴结构，基于电导信号法测量多黏度液体射流过程的电导信号随时间的变化规律，研究不同条件下流化床内颗粒团聚过程。研究结果表明：多孔气罩装置可以为喷嘴射流创造理想的稀相环境，避免了液滴在射流空腔以及交换区域的聚集和压缩；液体射流在床层扩散过程中可以观察到不同的流化阶段，即颗粒润湿阶段、团聚形成阶段、团聚隔离阶段；较高的气液比可以有效地阻止颗粒团聚，相比于较低的流化气速，较高的气速条件允许高黏度糖水溶液参与液体射流。本研究为多黏度液体射流过程颗粒团聚现象的在线监测提供了理论研究基础，确保了流化床内射流液滴与颗粒表面的良好接触。

Abstract

Reducing the reaction temperature during the raw liquid injection stage will lead to different viscosities of liquid

and result in particles adhesion forming agglomeration in different sizes

this hinders heat transfer to reacting liquid and slows the cracking reactions. Therefore

particles agglomeration is an important and challenging problem for thermal cracking in fluid cokers. In the present study

the gas shroud attachment was used to improve nozzle structure

and the particles agglomeration process during nozzle injection of multi-viscosity liquid was investigated in a fluidized bed operated at different conditions based on a conductance method using a water-sand system to simulate the hot bitumen-coke system at room temperature. The results show that the porous gas shroud attachment can create an ideal dilute phase environment for liquid injection and avoid the droplets accumulation in the injection cavity and particles exchange area. Different stages can be observed during the liquid injection dispersion throughout the bed

the wetting stage

the agglomerate formation stage

and the agglomerate segregation stage. A higher gas-liquid ratio (GLR) of the nozzle provides a method to prevent particles agglomeration

and the conditions at a high gas velocity allow a higher concentration of sucrose in the liquid injection compared with that at a low fluidizing gas velocity. This study provides a theoretical basis for on-line monitoring of particles agglomeration during liquid injection to guarantee perfect contact between the atomized droplets and the bed particles.

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references

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