Analysis of fly ash deposition blockage mechanism and structure optimization of low temperature economizer

被引：0

作者：

Fu S. ^{[1
,2
]}

Cao G. ^{[1
,2
]}

Chen Q. ^{[3
]}

Sun X. ^{[3
]}

Ou G. ^{[1
,2
]}

Zhou F. ^{[1
,2
]}

Li L. ^{[1
,2
]}

机构：

[1] School of Mechanical Engineering and Rail Transit, Changzhou University, Jiangsu, Changzhou

[2] Key Laboratory of Green Process Equipment in Jiangsu Province, Jiangsu, Changzhou

[3] Sinopec Yangzi Petrochemical Branch Thermal Power Plant, Jiangsu, Nanjing

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 08期

关键词：

economizer; fly ash particles; heat transfer; numerical simulation; sediment;

D O I：

10.16085/j.issn.1000-6613.2021-1944

中图分类号：

学科分类号：

摘要：

In response to the occurrence of fly ash deposition blocking the furnace tube gap in low-temperature economizer of thermal power plants, the particle deposition behavior was analyzed using a shear transfer (SST) k-ω turbulence model and a discrete particle model (DPM). The deposition dynamics near the support beam in the economizer was predicted, and then the fin arrangement structure above the support beam was optimized and flow field was analyzed. The results showed that fly ash particles were deposited on the upper surface of the support beam due to the presence of the support beam and the upper fins in the coal economizer. Under denitrification conditions, ammonium bisulfate increased the adhesion between the fly ash. This aggravated the adhesion deposition, and thus the ash accumulation grew upwards and caused blockage. By changing the structure of the fin arrangement above the support beam, the flue gas flow pattern near the support plate was changed. For most of the fly ash particles (dp>40μm) in the flue gas, the inertial effect dominated and had a large impact rate with the wall. By changing the arrangement of the fins on the furnace tube, the ability of the fly ash particles to move laterally was increased, which has a better effect on the deposition blockage on the support beam. © 2022 Chemical Industry Press. All rights reserved.

引用

页码：4035 / 4046

页数：11

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