Ruilong Science | Introduction to Baghouse Dust Collectors

A dust collector is a device used to separate dust particles from flue gas, and it is also referred to as a dust removal equipment.

Dust removal according to its Principle of operation Divided into the following three categories:

(1) Filter-type dust collectors include baghouse dust collectors, cartridge dust collectors, and sintered-plastic plate dust collectors, among others.

(2) Electrostatic precipitator.

(3) Gravity dust collector.

Dust collectors according to Dust Removal Methods Divided into:

(1) Dry dust collector.

(2) Semi-dry dust collector.

(3) Wet dust collector.

Applications of Dust Collector Products : Widely used in woodworking shops, paint shops, sanding workshops, battery production facilities, chemical plants, as well as dusty environments such as cement factories, coal mines, and the power industry.

Note: This time, the focus is primarily on pulse-jet bag filters.

The dust collector consists of Box body 、 Filter bag (With frame), Ash Removal Device ， Ash hopper And Ash Removal Device Consisting of.

The inside of the dust collector is Ceiling panel Divided into two parts. The upper part is called Upper box body Or Cleanroom . The following section is referred to as Bag chamber Or Filter Chamber 。

Cleanroom The cleanroom is equipped with blow pipes, compressed air tanks, pulse valves, compressed air pipelines, outlet ducts, inspection doors, and more. Depending on the specific specifications, the cleanroom is divided into several individual chambers, separated from one another by steel plates that ensure no airflow between them. Each chamber features a lifting valve and multiple rows of filter bags, with each row of bags connected to a dedicated blow pipe. Notably, every single filter bag aligns precisely with a blow hole on its corresponding blow pipe.

Filter Chamber The filter chamber includes the ceiling plate, filter bag assembly, ash hopper, flue gas inlet duct, and more.

The filter bag material is a flexible, breathable medium, typically made of needle-punched or coated materials.

The filter bags are supported by a metal cage frame to ensure they don’t collapse during filtration. The filter bag and cage frame, functioning as a single unit, are suspended from the ceiling plate.

A dust hopper is installed beneath the filter chamber, and it also typically serves as the inlet for flue gas.

The deflector plates in the ash hopper are designed to absorb the kinetic energy of high-speed particles in the inlet flue gas and evenly distribute the incoming airflow, protecting the filter bags from abrasion while ensuring uniform loading across all bags.

Electronically controlled device: Located at the outlet of the ash hopper. Includes an ash discharge valve, screw conveyor, conveying chute, or pneumatic ash handling system.

Dust Filter Bag Replacement ：

1. Cut off the compressed air to the chamber

2. Open the lid of the top housing and remove the blowpipe.

3. Inspect and replace the filter bags—carefully remove the frames one by one, take out any damaged bags, install new ones in their place, and then reposition the frames.

4. After the replacement is complete, install the blowpipe and secure the lid.

Filtration Principle Dust-laden gas enters through the air inlet and, as it flows past the dust hopper, larger particles are separated out due to inertia and gravity, falling directly to the bottom of the hopper. After passing through the hopper, the dusty gas moves into the filtration zone inside the casing, where it passes through the filter bags. The dust is trapped on the outer surface of the bags, while the cleaned gas escapes through the bag openings, enters the upper casing, and is finally discharged via the outlet vent.

Ash Removal Principle : The resistance of the dust collector increases as the thickness of the dust layer on the filter bags grows. When this resistance reaches a specified value, the pulse control system activates the pulse valves, releasing compressed air from the air reservoirs. This high-pressure air is directed through the pulse valves and then ejected via tiny nozzles on the blowpipe, creating a high-speed, high-pressure jet of inducing airflow that forms an induced airflow several times larger in volume than the original jet. Together, these powerful flows surge into the filter bags, instantly generating positive pressure inside and causing the bags to expand rapidly. As a result, the dust deposited on the outer surfaces of the filter bags is dislodged and falls into the dust hopper, effectively achieving the purpose of cleaning the filters.

The ash-cleaning control method typically employs Timing Method , or alternatively adopt Fixed-resistance method 。 

Timing Method That is, performing chamber-by-chamber dust cleaning according to the pre-set time sequence.

Fixed-resistance method That is, based on the control of the pressure difference between the inside and outside of the filter bags, the signal sent by the differential pressure transmitter is processed by an electrical control device, which then carries out chamber-by-chamber dust cleaning according to a predefined sequence.

Dust Collection: Dust captured during filtration and ash-cleaning processes settles into the dust hopper, from which it is then discharged collectively through the hopper outlet.

Choose one of the two options

Baghouse dust collectors are found in nearly every industrial sector, such as:

Steel Industry: Flue gas purification for blast furnaces, converters, electric furnaces, sintering machines, and coke ovens.

Cement Industry: Dust Removal from Kiln Heads, Kiln Ends, Clinker Coolers, and Cement Mills.

Power Industry: Flue Gas Dust Removal from Coal-Fired Boilers (in conjunction with desulfurization systems).

Non-ferrous metal smelting: Recovery of fumes and dust generated during the smelting processes of copper, aluminum, lead, zinc, and more.

Dust control in industries such as chemical engineering, machinery, food processing, and wood processing.

1. Steel and Metal Smelting Industry

This is one of the most widely used and technically demanding fields for baghouse dust collectors.

Application phase:

Ironmaking: Blast furnace iron tapping area, dust removal from ore and coke bins, and pulverized coal preparation.

Steelmaking: Secondary dust removal in the converter, flue gas purification for electric furnaces, and dust removal in the ladle furnace (LF furnace).

Steel Rolling: Dust removal from finishing mills, tension-levelers, and shot blast machines on both hot and cold rolling production lines.

Sintering: Dust removal at the head and tail of the sintering machine, as well as dust collection during material preparation

Coking: Coal charging and coke discharge dust removal from the coke oven, as well as dust removal during dry quenching (CDQ).

Meaning: Recycle valuable metal materials such as iron powder and zinc to ensure safe production and meet ultra-low emission standards.

2. Cement and Building Materials Industry

Almost all dust-generating points in the production process require dust removal.

Application phase:

Raw Material Preparation: Limestone crushing, raw material grinding (raw meal mill), and dust removal.

Clinker calcination: Clinker cooler at the kiln head and exhaust gas treatment at the kiln tail—these are critical process equipment.

Finished product preparation: Cement grinding (cement mill), coal mill dust removal.

Packaging and Transportation: Cement packaging machines, roof dust removal, and bottom-of-bin dust collection.

Meaning: Significantly reducing product loss and recovering thermal energy are the lifelines for cement plants to cut costs, boost efficiency, and meet environmental standards.

3. Power and Energy Industry

Application phase:

Coal-fired power plants: Boiler flue gas dust removal (which is the core of the flue gas purification system and is often used in conjunction with desulfurization and denitrification systems)

Biomass Power Generation: Boiler Flue Gas Treatment to Prevent Alkali Metal Fouling

Waste-to-Energy Incineration: Flue Gas Purification in Incinerators, Capturing Dust Adsorbed with Dioxins and Heavy Metals

Meaning: Achieving ultra-low emissions of smoke and dust is a nationally prioritized application area for preventing and controlling atmospheric pollution.

4. Non-ferrous Metals Industry

Application phase:

Aluminum Industry: Electrolytic Aluminum Flue Gas Purification, Alumina Handling, and Dust Removal in Material Feeding

Copper, lead, and zinc smelting: melting furnaces, converting furnaces, refining furnaces, and flue gas dust removal for sintering machines

Meaning: Dust often contains high-value rare metals, making recovery highly economically beneficial; flue gas has a complex composition, posing stringent requirements for the corrosion resistance of filter materials.

5. Machinery and Foundry Industry

Application phase:

Casting: Cupola furnace and electric furnace melting, vibration sand dropping, and shot blasting for dust removal.

Welding: Comprehensive Collection of Welding Fumes in a Large Welding Workshop

Grinding and Polishing: Dust Collection for Metal and Woodwork Components

Meaning: Improve the workshop environment, protect workers' health, and prevent pneumoconiosis.

Why choose our baghouse dust collector?

1. Extraordinary efficiency, witnessing the power of purity

99.9%+ dust removal efficiency: Utilizing premium filter materials and precision manufacturing techniques, it achieves ultra-clean capture of dust particles down to the sub-micron level, with emission concentrations far below the national ultra-low emission standard of less than 10 mg/m³—helping you effortlessly meet even the strictest environmental regulations.

2. Intelligent ash removal, ensuring stable and efficient operation

Customized Dust-Cleaning System: Equipped with intelligent differential pressure control and advanced pulse-jet blowing technology, it automatically optimizes dust-cleaning frequency and intensity based on operational conditions. This ensures low resistance while significantly extending filter bag life, reducing both operating energy consumption and maintenance costs.

3. Firm as a rock, with quality that lasts enduringly

Craftsmanship in design and material selection: The structural design is scientifically engineered for superior blast resistance and moisture protection. The filter bag skeleton is crafted from premium materials using advanced welding techniques, ensuring the equipment remains reliably operational even under harsh conditions—and delivering a service life that significantly outperforms industry standards.

4. Flexible adaptation, versatile application

Modular design concept: Whether you're involved in steel smelting, cement production, coal-fired power generation, chemical manufacturing, or food processing, we can provide tailor-made machine configurations that perfectly match various air flow rates and dust characteristics.

5. Smart Connectivity, Making Operations and Maintenance Hassle-Free and Effortless

Optional IoT smart cloud platform: Real-time remote monitoring of equipment status, differential pressure, temperature, and other critical data, along with fault alerts and remote diagnostics—giving you complete control and significantly boosting your management efficiency. 。

We specialize in the field of industrial flue gas and dust control, leveraging our deep-rooted technical expertise and extensive project experience to provide you with end-to-end baghouse dust removal solutions—from design and manufacturing to installation and operation/maintenance. Our equipment isn’t just the "cleaner" for your workshop; it’s also your trusted "guardian," ensuring both enhanced production efficiency and a strong environmental reputation.

Ruilong Group was founded in 2006. 
 

It has now passed various industry-related qualification certifications.

Specializing in EPC turnkey projects for desulfurization, denitrification, and dust removal

Possessing a professional and sophisticated air pollution control R&D team

Capable of installation, construction, and operation & maintenance

Integrated Services

It is a supplier widely recognized by customers for its integrity.