Applications of pulse cartridge dust collectors

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I. Overview
The HJ series pulse cartridge central dust collector is a mature product developed by Shenzhen Hongjia Environmental Protection Equipment Co., Ltd. It features the following advantages:
1. It adopts a vertical cartridge structure, which facilitates dust adsorption and cleaning. Since the filter media experiences minimal shaking during cleaning, the lifespan of the cartridges is longer than that of bag filters, resulting in lower maintenance costs.
2. It utilizes an advanced international offline three-state cleaning method (filtering, cleaning, and resting), which prevents re-adsorption of dust during cleaning and ensures thorough and reliable cleaning.
3. It is equipped with a pre-dust collection mechanism, which not only eliminates the problem of dust directly scouring and wearing out the cartridges but also helps to increase the dust concentration at the inlet of the dust collector.
4. Key components that affect performance, such as pulse valves, are imported; the service life of their vulnerable diaphragms exceeds 1 million cycles.
5. It employs a distributed blowing cleaning technique, allowing one pulse valve to simultaneously blow air at one row of cartridges (with up to 12 cartridges per row), thereby significantly reducing the number of pulse valves required.
6. The three-state cleaning mechanism of the pulse valves is controlled automatically by a PLC, with both timed and manual control options available.
7. Different combinations of rows and columns of cartridges can be used depending on the available installation space. The small volume occupied per unit of filtering area helps users save a significant amount of space, thereby reducing their initial investment costs.
8. It has a long service life – the cartridges can last 2–3 years – which greatly reduces the frequency of replacing filter elements (traditional bag filters require element replacement every 6 months or so). Its simple maintenance structure further lowers the operational costs for users.

II. Equipment Structure and Working Principle
1. Structure: The HJ series pulse cartridge central dust collector consists of six parts: the upper box, ash hopper, ladder platform, supports, pulse cleaning device, and ash discharge device.
2. Working Principle: Driven by the main fan in the system, dusty gas enters the dust collector from the inlet at the bottom. There, the gas undergoes preliminary treatment before moving upward to the various dust removal chambers in the upper box. Dust adheres to the outer surface of the cartridges, while the cleaned gas passes through them and enters the clean gas chamber in the upper box, from where it is discharged through the outlet. As filtration continues, more dust accumulates on the outer surface of the cartridges, increasing the operating resistance of the equipment. To ensure normal operation, the resistance of the dust collector should be maintained within the range of 1400–1600 Pa. When this limit is exceeded, the PLC-controlled pulse cleaner sends commands to perform cleaning in three stages. In this pulse cartridge cleaning process, the clean gas outlet for a particular chamber is first closed, putting that chamber in a state of no airflow. Then, compressed air is used for pulse cleaning. After cleaning, the chamber is allowed to settle naturally for a few seconds before the clean gas outlet is reopened. This approach ensures thorough cleaning while preventing re-adsorption of dust, with cleaning being carried out sequentially for each chamber.

III. Selection of Dust Collectors
1. Determination of Filtration Air Velocity
Filtration air velocity is one of the key parameters in selecting a dust collector. It should be determined based on factors such as the nature, particle size, temperature, and concentration of the dust or smoke in different applications. Generally, when the inlet dust concentration is between 15–30 g/m³, the filtration air velocity should not exceed 0.6–0.8 m/min. If the inlet dust concentration is between 5–15 g/m³, the velocity should not exceed 0.8–1.2 m/min. For concentrations of ≤5 g/m³, the velocity should not exceed 1.5–2 m/min. In general, to minimize equipment resistance, it is advisable not to choose too high a filtration air velocity.
2. Filtration Materials
The HJ series pulse cartridge central dust collector uses imported fiber filter media. When filtering gases at normal temperatures or below 100°C, PS polymer-coated fiber filters are typically used. For high-temperature applications, PSU polymer-coated fiber filters are necessary. In cases with special requirements, alternative filter materials must be selected. 3. Ash discharge method: The HJ series pulse bag-type central dust collectors all use screw conveyors for ash discharge. Fourth, in industrial applications, it can be used for collecting dust of various types, such as in industries like hardware manufacturing, mechanical processing, ceramics, building materials, chemicals, food, pharmaceuticals, and electronics. It is also effective for dust removal in steel and non-ferrous metal industries, as well as in mining operations and various types of furnaces (such as blast furnaces, melting furnaces, and incinerators).