Abstract

Objective Pleated filter cartridge is internationally recognized as an efficient dust removal device. It can be classified into two forms： circular and rectangular flat pleated filter cartridges. Compared to circular cartridges， the rectangular flat pleated filter cartridges have the advantages of a smaller size and higher efficiency， resulting in excellent filtering performance. However， due to their intricate pleated structure， the surface pressure distribution of the rectangular flat pleated filter cartridge is uneven， leading to insufficient dust removal. Based on a newly designed intensive injection nozzle， the pressure intensity and uniformity are analyzed.

Methods In this paper， a new type of intensive injection nozzle was designed based on the pleated and compact structure of the rectangular flat pleated filter cartridge. A pulse-jet experiment platform was used to explore the pressure distribution at different injection pressures and distances. The optimal injection parameters for intensive injection nozzles were selected by comparing them with traditional circular injection nozzles. Finally， the industrial powder coating experiments were used to test the cleaning effect of the intensive injection nozzles in actual industrial operations. The experiment results demonstrated the effectiveness of these nozzles in improving pressure distribution uniformity.

Results and Discussion It was found that when the injection distance increased， the peak pressure on the sidewall of the two types of injection nozzles showed a decreasing trend. However， with intensive injection nozzles， the maximum sidewall pressure exceeded 600 Pa， meeting the pressure required for pulse cleaning. In contrast， when using traditional circular injection nozzles， the peak pressure occurred at the positive injection test point， with the highest value reaching 5600 Pa and the lowest at only 342 Pa， failing to meet the pressure criteria for dust cleaning. The maximum pressure difference of the circular nozzle reached 1952 Pa， showing significant fluctuations. In comparison， the maximum pressure difference of the intensive injection nozzle was only 1092 Pa， with a much gentler decline. Increasing the injection pressure could enhance the pressure intensity to a certain extent， but the difference in uniformity became more apparent. With the use of intensive injection nozzle， the uniformity of pressure distribution on the filter cartridge surface improved by 17.67% compared to previous research results. Comprehensive analysis showed that the optimal cleaning effect could be obtained when the injection pressure was 0.2 MPa， and the injection distance was 20 mm. Industrial powder coating experiments showed that as the filtration wind velocity increased， traditional circular injection nozzles tended to experience system failures. When the filtration wind velocity was 1.0 m/min， the difference in dust residue between the two types of injection nozzles was 0.748 kg， with a maximum dust residue increase difference of 21.81%， further validating the effectiveness of the intensive injection nozzles. With the intensive injection nozzle， the maximum operating resistance difference could be maintained at 285 Pa， and the residual dust content was less than 2% of the feed amount. Changes in dust concentration had little effect on system operation. Industrial conditions could be adjusted according to specific production and application scenarios to optimize the performance of rectangular flat pleated filter cartridge dust collectors.

Conclusion Intensive injection nozzles can effectively enhance the overall pressure distribution uniformity on the surface of rectangular flat pleated filter cartridge， improve cleaning performance， and enable the dust collector system to maintain stable long-term operation.

Keywords： rectangular flat pleated filter cartridge dust collector； injection nozzle； pressure distribution； dust cleaning performance

Get Citation: ZHOU Meiyibo， ZHANG Yulu， XU Menghao， et al. Impact of intensive injection nozzles on cleaning uniformity of rectangular flat pleated filter cartridges［J］. China Powder Science and Technology， 2025， 31（6）： 1-12.

Received: 2024-01-25 .Revised: 2024-06-15, Online: 2025-06-24

Funding Project: 国家自然科学基金项目， 编号： 52204286； 四川省科技计划资助项目， 编号： 2023YFS0362。

First Author: 周美伊柏（1997—），女，硕士生，研究方向为工业通风除尘。E-mail： 1505769296@qq.com。

Corresponding Author: 林龙沅（1981—），男，教授，博士，硕士生导师，研究方向为气流粉碎、分级与除尘净化。E-mail： LLy7572@126.com。

DOI：10.13732/j.issn.1008-5548.2025.06.017

CLC No: X964； TB4        Type Code: A

Serial No: 1008-5548（2025）06-0001-12