How to Treat Waste Gas from Air-Jet Rooms?

Air-jet rooms (common in textile factories, such as air-jet weaving rooms) generate a large amount of waste gas during operation, which mainly includes textile dust (cotton dust, polyester dust, etc.), fiber fragments, and a small amount of oil fume and moisture. The waste gas has the characteristics of low to medium dust concentration (100-500g/m³), small dust particle size (≤5μm), light weight, easy floating, and certain fiber adhesion. The treatment of waste gas from air-jet rooms needs to focus on dust removal, fiber recovery and anti-blockage, and the specific treatment scheme is as follows:

1. Pre-Treatment: Fiber Recovery and Large Particle Removal
The waste gas from air-jet rooms contains a large amount of usable fiber fragments, which can be recovered first to reduce waste and dust load. Install a fiber recovery device (such as a fiber separator) at the waste gas inlet: the waste gas passes through the separator, and the fiber fragments are separated and recovered under the action of centrifugal force or filtration; the remaining small-particle dust enters the subsequent purification device. In addition, a cyclone dust collector can be installed to remove large-particle dust (≥10μm) and avoid wear and blockage of subsequent equipment.

 2. Core Purification: Pulse Bag Filter (Preferred)
The pulse bag filter is the core equipment for treating waste gas from air-jet rooms, which has high dust removal efficiency and can adapt to the characteristics of textile dust.
Key configurations: 1. Filter bags: Select polyester needle felt or polyester anti-static needle felt (textile dust is flammable, anti-static measures are required), and the filter bags can be treated with water-repellent and oil-repellent coating to avoid fiber adhesion and blockage. 2. Cleaning system: Optimize the pulse cleaning parameters, set the cleaning frequency to 40-60s/time and spray pressure to 0.4-0.5MPa, ensure thorough cleaning of the filter bags, and avoid fiber accumulation. 3. Air volume matching: The air volume of the dust collector should be 10-20% higher than the waste gas volume of the air-jet room to ensure that the waste gas is completely captured and treated.

3. Auxiliary Measures: Moisture Removal and Anti-Static
1. Moisture removal: The waste gas from air-jet rooms has a certain humidity (relative humidity 60-80%), which is easy to cause filter bag dampness and blockage. The dust collector body and air pipelines are insulated with thermal insulation cotton to avoid dew formation; a dehumidifier can be installed at the waste gas inlet for high-humidity occasions to reduce the humidity to below 70%. 2. Anti-static: Textile dust is flammable, and static accumulation is easy to cause fire hazards. The dust collector body, pipelines and filter bags are grounded (grounding resistance ≤4Ω); anti-static filter bags are used to avoid static sparks.

 4. Tail Gas Discharge and Fiber Recovery
The clean gas after purification (dust concentration ≤30mg/m³) is discharged through the fan and exhaust pipe, and can be discharged directly or recycled to the air-jet room (after dehumidification) to save energy. The recovered fiber fragments are processed and reused as raw materials to reduce production costs. For waste gas containing a small amount of oil fume (such as air-jet rooms using lubricating oil), an activated carbon adsorption device can be added after the pulse bag filter to adsorb oil fume and odors, ensuring emission compliance.

 5. Equipment Selection and Maintenance
For small and medium-sized air-jet rooms, mobile pulse bag dust collectors can be selected, which are flexible and convenient; for large-scale air-jet rooms with multiple production lines, centralized pulse bag dust collectors are selected for unified treatment. Daily maintenance: Regularly clean and maintain the fiber recovery device to ensure recovery efficiency; regularly check the filter bags for adhesion and damage, and replace them in time; drain the moisture in the air bag of the cleaning system to ensure stable spray pressure; regularly clean the ash hopper to avoid dust accumulation.