李建龙¹，钟建芳¹，陈建武²，杨 斌²，黄 虹¹，黄 珊¹，游 达¹，马志飞¹

1. 南昌大学 资源与环境学院，江西 南昌 330000；2. 中国安全生产科学研究院，北京 100012

引用格式：

李建龙，钟建芳，陈建武，等. 条缝喷嘴对方框滤筒清灰性能的影响［J］. 中国粉体技术，2025，31（3）：56-66.

LI Jianlong， ZHONG Jianfang， CHEN Jianwu， et al. Impact of slot-type nozzle on dust-cleaning performance of rectangular filter cartridge［J］. China Powder Science and Technology，2025，31（3）：56−66.

DOI：10.13732/j.issn.1008-5548.2025.03.005

收稿日期：2024-09-22，修回日期：2024-12-05，上线日期：2025-04-10。

基金项目：国家自然科学基金项目，编号：52064037；国家卫生健康委粉尘危害工程防护重点实验室开放课题，编号：KLECDH2023030101；江西省自然科学基金杰出青年基金项目，编号20242BAB23036。

第一作者简介：李建龙（1988—），男，副教授，博士，硕士生导师，江西省主要学科学术与技术带头人青年人才计划、南昌大学“215”人才赣江青年学者。研究方向为工业除尘技术。E-mail：jlli@ncu. edu. cn。

摘要：【目的】 为了改善方框滤筒在清灰过程中存在的“死区”和整体清灰效果不佳的问题，分析条缝喷嘴的喷吹距离和开缝长度对滤筒清灰性能的影响，以实现更有效的清灰效果。【方法】 构建条缝喷嘴脉冲喷吹的数值模型，对滤筒内部的流场进行模拟和分析，以侧壁压强峰值和变异系数作为评价清灰性能的技术指标，设计 4种条缝喷嘴，长度分别为 75、50、38、30 mm，宽度均为 6 mm，探讨喷吹距离和不同开缝长度对滤筒内壁压强分布的影响。【结果】 条缝喷嘴喷出的气流会在滤筒底部汇聚，并在滤筒中下部持续保持较高压强，从而有利于该区域的滤筒清灰；条缝喷嘴对方框滤筒的喷吹强度随着喷吹距离的增加而先增强后减弱，喷吹距离为200 mm时喷吹强度最佳，为2 076 Pa，此时滤筒侧壁的压强分布较为均匀，对应的变异系数为0. 27；喷吹强度随条缝喷吹管开缝长度的减小而先增强后减弱，开缝长度为38 mm时，喷吹强度最佳，为2 261Pa，对应的变异系数为0. 41。【结论】 通过合理控制喷吹距离和开缝长度，能够确保气流均匀分布并有效冲击滤筒表面，实现高效清灰效果，利于条缝喷嘴在滤筒清灰中的更好应用。

关键词：方框滤筒；条缝喷嘴；喷吹距离；开缝长度；清灰性能

Abstract

Objective In order to improve the “dead zone” and overall poor cleaning effect of the box filter cartridge during the cleaning process， the influence of the spraying distance and opening length of the slot nozzle on the cleaning performance of the filter cartridge is analyzed to achieve more effective cleaning effect and provide guidance for engineering practice.

Methods Construct a box filter cartridge dust collector system and simplify it based on the system. Then， perform grid independence， simulation， and experimental verification to analyze the effects of different blowing distances and slot lengths on the flow field and sidewall pressure values inside the filter cartridge. Using the peak sidewall pressure and coefficient of variation as technical indicators to evaluate the dust cleaning performance， design four types of slot nozzles with lengths and widths of 75 mm×6 mm，50 mm×6 mm，38 mm×6 mm， and 30 mm×6 mm， and explore the effects of blowing distances and different slot lengths on the pressure distribution on the inner wall of the filter cartridge.

Results and Discussion This article explores the optimal cleaning parameters of a slot nozzle for a square filter cartridge， and investigates the effects of blowing distance and slot length on the blowing intensity and uniformity of the filter cartridge. The main conclusions are as follows. The airflow ejected from the slot nozzle converges at the bottom of the filter cartridge and maintains sustained high pressure in the middle-lower section， thereby enhancing dust cleaning efficiency in this region. For rectangular filter cartridges， the jet intensity first increases then decreases with increasing blowing distance， reaching optimal performance at 200 mm with a peak intensity of 2，076 Pa. At this distance， the sidewall pressure distribution demonstrates improved uniformity， evidenced by a coefficient of variation of 0. 27. Similarly， jet intensity exhibits a non-monotonic relationship with slit length， peaking at 38 mm with maximum intensity of 2，261 Pa， though with slightly reduced uniformity （coefficient of variation：0. 41）. As the gap length decreases， the blowing intensity shows a trend of first increasing and then decreasing. When the gap length is too large， the sprayed airflow is too concentrated， the cleaning range is limited， and the total amount of suction airflow is insufficient， resulting in difficulty in cleaning the top of the filter cartridge； When the slit length is too small， it leads to a decrease in the air flow rate and airflow intensity of a single nozzle.

Conclusion By reasonably controlling the spraying distance and slot length， it is possible to ensure uniform distribution of airflow and effective impact on the surface of the filter cartridge. Under the optimal spraying distance and slot length conditions in this article， the pressure value on the side wall of the filter cartridge is relatively high and the pressure distribution is relatively uniform， which can achieve efficient dust cleaning effect. The research results of this article provide theoretical guidance for the application of slot nozzles in filter cartridge dust cleaning.

Keywords：box filter cartridge； striped nozzle； spray distance； slit length； dust cleaning performance

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