Sedimentation characteristics of the bottom surface of the inlet pipe box of a waste heat boiler

doi:10.11949/0438-1157.20240472

Abstract

Abstract:

Using computational fluid dynamics software and based on the Euler-Lagrange method, numerical simulations were conducted on the deposition characteristics of the bottom surface of an inlet pipe box of a waste heat boiler. The effects of different mass flow rates (0.002—0.010 kg·s^-1), inlet velocities (1.5—3.5 m·s^-1), and particle diameters (20—60 $μ m$ ) on the deposition characteristics of the bottom surface are studied in detail. The simulated gas-solid two-phase velocity matches well with experimental data, verifying the applicability of the model. The simulation results show that: (1) When the particle diameter remains unchanged, in order to improve the bottom surface deposition, the inlet velocity and particle mass flow rate should be reduced as much as possible. (2) When the particle mass flow rate remains constant, if the particle diameter is less than 40 $μ m$ , a smaller inlet velocity can effectively improve the bottom deposition situation; If the particle diameter is greater than 40 $μ m$ , increasing the inlet velocity can significantly improve the bottom deposition situation; If the particle diameter is 40 $μ m$ , the change in inlet velocity can hardly change the bottom deposition rate. (3) When the inlet velocity remains constant, in order to improve the bottom deposition situation, the particle diameter and particle mass flow rate should be minimized as much as possible.

Key words: gas-solid two-phase flow, deposition, numerical simulation, waste heat boiler, computational fluid dynamics

摘要：

采用计算流体力学软件，基于Euler-Lagrange方法，对一种余热锅炉入口管箱底面沉积特性进行数值模拟，详细研究了质量流量（0.002~0.010 kg·s^-1）、入口速度（1.5~3.5 m·s^-1）以及颗粒直径（20~60 $μ m$ ）对底面沉积特性的影响规律。模拟的气固两相速度与实验数据吻合较好，验证了模型的适用性。模拟结果表明：（1）当颗粒直径不变时，为了改善底面沉积情况，应当尽量减小入口速度和颗粒质量流量；（2）当颗粒质量流量不变时，若颗粒直径小于40 $μ m$ ，较小的入口速度能够较好地改善底面沉积情况；若颗粒直径大于40 $μ m$ ，增大入口速度能够显著改善底面沉积情况；若颗粒直径为40 $μ m$ ，入口速度的变化几乎不能改变底面沉积速率；（3）当入口速度不变时，为了改善底面沉积情况，应当尽量减小颗粒直径和颗粒质量流量。

关键词: 气固两相流, 沉积, 数值模拟, 余热锅炉, 计算流体力学

CLC Number:

TK 224

Haoran ZHAO, Siluo HUANG, Mei LIN. Sedimentation characteristics of the bottom surface of the inlet pipe box of a waste heat boiler[J]. CIESC Journal, 2024, 75(10): 3464-3476.

赵浩然, 黄嗣罗, 林梅. 余热锅炉入口管箱底面沉积特性[J]. 化工学报, 2024, 75(10): 3464-3476.

Figures/Tables 23

Fig.1 Schematic diagram of geometric model of inlet pipe box

Fig.2 Schematic diagram of the layout of the heat exchange tube

Fig.3 Verification of mesh independence

Fig.4 Comparison of velocity distribution and experimental data of gas-solid flow at different deflection angles inside a curved pipe

Fig.5 The variation of bottom deposition rate with inlet velocity under different particle mass flow rates

Fig.6 The variation of deposition efficiency with inlet velocity under different particle mass flow rates

Fig.7 Solid phase velocity vector diagram on the symmetrical plane of the inlet pipe box with a particle mass flow rate of 0.002 kg·s-1

Fig.8 Deposition cloud map of the bottom surface of the pipe box with a particle mass flow rate of 0.002 kg·s-1

Fig.9 Solid phase velocity vector diagram on the symmetrical plane of the inlet pipe box with a particle inlet velocity of 1.5 m·s-1

Fig.10 The variation of bottom deposition rate with inlet velocity under different particle diameters

Fig.11 The variation of deposition efficiency with inlet velocity under different particle diameters

Fig.12 Solid phase velocity vector diagram on the symmetrical plane of the inlet pipe box with a particle diameter of 30 μm

Fig.13 Deposition cloud map of the bottom surface of the pipe box with a particle diameter of 30 μm

Fig.14 Solid phase velocity vector diagram on the symmetrical plane of the inlet pipe box with a particle diameter of 40 μm

Fig.15 Radial distribution of solid particle volume fraction on the bottom surface of the pipe box with a particle diameter of 40 μm

Fig.16 Deposition cloud map of the bottom surface of the pipe box with a particle diameter of 40 μm

Fig.17 Solid phase velocity vector diagram on the symmetrical plane of the inlet pipe box with a particle diameter of 50 μm

Fig.18 Radial distribution of solid particle volume fraction on the bottom surface of the pipe box with a particle diameter of 50 μm

Fig.19 Deposition cloud map of the bottom surface of the pipe box with a particle diameter of 50 μm

Fig.20 The variation of bottom deposition rate with particle diameter under different particle mass flow rates

Fig.21 The variation of deposition efficiency with particle diameter under different particle mass flow rates

Fig.22 Solid phase velocity vector diagram on the symmetrical plane of the inlet pipe box with a particle mass flow rate of 0.002 kg·s-1

Fig.23 Deposition cloud map of the bottom surface of the pipe box with a particle mass flow rate of 0.002 kg·s-1

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