FLZ Low Pressure Pulse Jet Baghouse Dust Collector for Industrial Dust Control
Introduction:Industrial dust treatment projects in metallurgy, casting, cement building materials and grain processing often pursue low air consumption, compact layout and low operation cost. The FLZ low pressure pulse jet baghouse dust collector adopts online low-pressure pulse cleaning technology, which only requires 0.20~0.35 MPa injection pressure. It supports long filter bags of 6 meters, greatly reducing the floor space. As a modular unit type dust collector, it can be assembled with 1, 2, 3 or 4 units flexibly. It is equipped with submerged pulse valves and full-automatic differential pressure control system, delivering stable dust removal performance and low running energy consumption for various industrial flue gas and powder recovery applications.
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Product Introduction
The FLZ low pressure pulse jet baghouse dust collector is a modular online pulse bag filter, mainly composed of support frame, hopper, filter chamber, clean air chamber, Dust Collector Filter bags, pulse jet assembly and intelligent controller. The whole machine is designed in unit modules, and users can combine 1, 2, 3 or 4 units according to air volume demands. Each standard unit contains 24 rows of filter bags with 12 bags per row, totaling 336 bags and 800 m² of filtration area. The Dust Collector Filter bag dimension is Φ130 mm × 6000 mm, and the standard filter material is polyester needle felt. It is widely used in metallurgy, foundry, mining, chemical, pharmaceutical, cement, grain feed, machinery, light industry and power industries for flue gas purification and material recycling.
Different from traditional high-pressure pulse dust collectors, the FLZ series applies advanced online low-pressure pulse jet cleaning technology. It achieves thorough cake removal with far less compressed air consumption. The injection pressure is only 0.20~0.35 MPa, so it can normally share the existing compressed air pipeline of the production line, which cuts extra capital investment. The cleaning air source should still be clean and dry, and a properly sized Air compressor filter installed before the air tank removes oil mist, moisture and solid particles. Oil and water carried into the pulse valves will attack the diaphragms, and once they reach the Dust Collector Filter bags the fabric becomes wet, sticky and blinded. A dry, oil-free air supply is therefore the single most effective way to protect bag life and keep the cleaning cycle stable.
The unit adopts submerged pulse valves rated for more than one million stable actions, which guarantees long-term continuous operation. The full computer pulse controller supports automatic differential pressure cleaning and manual operation modes, with complete differential pressure display, convenient adjustment and optimized air consumption. Each Dust Collector Filter bag is fixed on the tube sheet by an elastic snap ring at the bag mouth for reliable sealing and easy disassembly. Operators replace bags from the top cover of the clean air chamber without entering the dust collector interior, improving working safety and maintenance efficiency.
Working Principle
After dusty gas enters the dust collector, the guide plate distributes the airflow evenly into the filter chamber. The airflow flows downward along the bags and passes through the filter media uniformly. Dust particles are intercepted on the outer surface of the Dust Collector Filter bags, while purified air penetrates the fabric, enters the clean air chamber and flows out through the exhaust duct to the fan.
The internal airflow organization is well optimized. The downward airflow inside the filter chamber is consistent with the falling direction of the dust cake during pulse injection. This layout helps dust settle rapidly into the hopper and avoids re-adhesion, which greatly improves the cleaning effect.
The cleaning cycle is controlled by differential pressure feedback. When dust accumulates and the equipment resistance rises to the preset value, the controller shortens the pulse injection interval to clean the bags in time. When the resistance drops back to a low level, the interval is extended automatically. This intelligent logic minimizes the number of injections, reduces air consumption and extends the service life of bags, pulse valve diaphragms and solenoid valves. Resistance, air volume and compressed air consumption stay in a balanced state for stable long-term operation.
When replacing bags, maintenance workers only need to remove the blow pipe on top, pull the bag cage upward, take out the damaged bag through the inspection opening of the hopper, install a new bag, embed the elastic ring on the tube sheet, put the cage back and reinstall the blow pipe. The whole operation is finished on top of the equipment, with no need to enter the dust collector body.
Main Structural Features
Intelligent control cabinet:
mounted on the equipment in a central position, easy to operate in both workshop and control room.
Filter bag with reliable sealing:
Φ130 × 6000 mm standard bag, elastic snap ring at the bag mouth, tight and simple sealing.
Centrifugal fan:
intake from the clean air chamber side, long service life for low dust load at the fan inlet.
High-quality pulse valve:
reliable action, stable cleaning, low fault rate on continuous duty.
Core Advantages
1. Online low-pressure pulse cleaning:
completes thorough cleaning with low compressed air consumption, overcoming the common defects of traditional bag dust collectors.
2. Low injection pressure and long bag design:
0.20~0.35 MPa working pressure, 6-meter bags maximize the filtration area in a small footprint and reduce cleaning energy consumption.
3. Durable submerged pulse valves:
exceed one million stable actions, adapting to heavy-duty continuous industrial conditions.
4. Intelligent full-automatic control:
automatic differential pressure cleaning plus manual mode, real-time pressure drop display, easy adjustment and air savings.
5. Compact structure:
no independent internal maintenance platform, internal space fully utilized, filtration velocity up to 2 m/min. Compared with large reverse air baghouses at the same air flow, weight, footprint and project cost are only about one third.
6. Convenient top-side maintenance:
bags replaced from the clean air chamber top cover, no entry into the equipment. When only a few bags are damaged they can be blocked temporarily, and batch replacement is arranged once damaged bags exceed 5%, which minimizes downtime.
7. Shared compressed air pipeline:
the low injection pressure allows the unit to use the factory's existing air system, with a single Air compressor filter on the branch line protecting the valves and bags.
Technical Parameters
| Model | FLZ-800 | FLZ-1600 | FLZ-2400 | FLZ-3200 | FLZ-4800 |
|---|---|---|---|---|---|
| Number of Units | 1 | 2 | 3 | 4 | 6 |
| Filter Bag Quantity | 336 | 672 | 1008 | 1344 | 2016 |
| Filter Bag Size | Φ130 × 6000 mm | Φ130 × 6000 mm | Φ130 × 6000 mm | Φ130 × 6000 mm | Φ130 × 6000 mm |
| Filter Material | Polyester Needle Felt | Polyester Needle Felt | Polyester Needle Felt | Polyester Needle Felt | Polyester Needle Felt |
| Filtration Area | 800 m² | 1600 m² | 2400 m² | 3200 m² | 4800 m² |
| Filtration Velocity | 1.0 m/min | 1.0 m/min | 1.0 m/min | 1.0 m/min | 1.0 m/min |
| Air Handling Capacity | 48000 m³/h | 96000 m³/h | 144000 m³/h | 192000 m³/h | 240000 m³/h |
| Equipment Resistance | 800–1500 Pa | 800–1500 Pa | 800–1500 Pa | 800–1500 Pa | 800–1500 Pa |
| Inlet Dust Concentration | 30–100 g/m³ | 30–100 g/m³ | 30–100 g/m³ | 30–100 g/m³ | 30–100 g/m³ |
| Dust Collection Efficiency | >99.5% | >99.5% | >99.5% | >99.5% | >99.5% |
| Air Leakage Rate | <3% | <3% | <3% | <3% | <3% |
| Pulse Valve Spec | 3" Submerged Type | 3" Submerged Type | 3" Submerged Type | 3" Submerged Type | 3" Submerged Type |
| Pulse Valve Qty | 24 | 48 | 72 | 96 | 144 |
| Injection Duration | 0.08 s | 0.08 s | 0.08 s | 0.08 s | 0.08 s |
| Injection Pressure | 0.20–0.25 MPa | 0.20–0.25 MPa | 0.20–0.25 MPa | 0.20–0.25 MPa | 0.20–0.25 MPa |
| Air Consumption | 0.2–0.25 m³ per valve pulse | 0.2–0.25 m³ per valve pulse | 0.2–0.25 m³ per valve pulse | 0.2–0.25 m³ per valve pulse | 0.2–0.25 m³ per valve pulse |
| Injection Interval | 5–20 s | 5–20 s | 5–20 s | 5–20 s | 5–20 s |
| Screw Motor Power | 2.2 kW | 3.5 kW | 4.0 kW | 5.5 kW | 7.5 kW |
| Equipment Weight | 21 t | 36 t | 52 t | 78 t | 118 t |
Application Scenarios
1. Metallurgy and Foundry:
furnace flue gas, casting sand dust, material transfer points, shaking-out and shot blasting stations.
2. Mining and Ore Processing:
crushing, screening, ore grinding and belt transfer dust collection.
3. Cement and Building Materials:
raw material crushing, packing machines, silo tops, dry-mix mortar lines.
4. Grain, Feed and Food:
grain milling, screening, feed pelleting and powder packing dust.
5. Chemical and Pharmaceutical:
powder drying, granulation, packing and material recovery.
6. Machinery, Light Industry and Power:
welding dust, shot blasting rooms, boiler auxiliary dust removal.
Buying & Selection Guide
When selecting an FLZ unit, confirm the total air volume at the capture hoods, the inlet dust concentration, dust particle size and the emission limit required locally. Filtration velocity should be held around 1.0 m/min, and can be raised toward 2 m/min only for coarse dry dust with light loading. A 10~20% air volume margin is recommended for fluctuating dust sources. Filter material should follow the flue gas temperature: standard polyester needle felt for continuous 130℃, and PPS or Nomex bags for higher temperature duty. For sticky or hygroscopic dust, surface-treated bags and a lower filtration velocity should be applied. Pneumatic design is equally important. The pulse air consumption is 0.2~0.25 m³ per valve per pulse at 0.2~0.25 MPa, so confirm the available air supply at the site before ordering. A dedicated Air compressor filter with a coalescing element, plus a refrigerated dryer if the site air is wet, will keep the Dust Collector Filter bags and valves in good condition throughout the service cycle. We supply drawings, foundation layout, spare parts lists and a bag replacement scheme for tender submission and on-site installation supervision.
FAQ
Q1: What is the core difference between the FLZ low pressure pulse dust collector and ordinary high-pressure pulse dust collectors?
A: FLZ needs only 0.20–0.25 MPa injection pressure, while traditional pulse collectors usually require 0.4–0.6 MPa. It saves compressed air and can normally share the factory's existing air compressor system, with a single Air compressor filter protecting the branch line.
Q2: Is the cleaning mode online or offline?
A: FLZ adopts online pulse cleaning. Compartments are not isolated during blowing, which suits stable working conditions with continuous airflow and avoids extra valve and ductwork cost.
Q3: What is the standard filter bag temperature resistance?
A: The standard polyester needle felt Dust Collector Filter bag withstands continuous 130℃. High-temperature options such as PPS and Nomex are available on request for hotter flue gas.
Q4: How are filter bags replaced on the FLZ unit?
A: Bags are replaced from the top cover of the clean air chamber, with no need to enter the dust collector interior. Single damaged bags can be blocked temporarily and batch replacement is scheduled when the damaged share exceeds 5%.
Q5: Can the FLZ dust collector be customized for larger air volume?
A: Yes. The unit-module design allows more modules to be combined for higher air handling capacity, and we support non-standard customization of housing size, duct position and filter material.
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