The converter secondary dedusting project, as the core filtering component of the bag-type dust collector, its performance stability directly affects the dust removal efficiency, equipment operation resistance, and production continuity. It is widely used in industries such as metallurgy, chemical engineering, building materials, and power generation.

Reasonable daily maintenance can significantly extend the service life of the filter bags and reduce equipment operation costs; standardized replacement operations can prevent secondary faults and ensure the dust collector returns to normal operation quickly.

I. Daily maintenance and operation guidelines for converter secondary dedusting project

The wear and tear of the converter secondary dedusting project mainly result from factors such as dust erosion, operational fluctuations, and maintenance deficiencies. Daily maintenance should follow the principles of "prevention first, regular inspection, and precise control", focusing on three core dimensions: daily inspection and monitoring, cleaning and maintenance, and operational adaptation.

(1) Daily inspection and monitoring

Daily inspection is the key to promptly detecting abnormalities in the filter bags. Key indicators to focus on include: monitoring the resistance of the dust collector at the inlet and outlet pressure gauges, recording the resistance values at regular intervals, and ensuring they fall within the design standard range (typically 800-1500 Pa). If the resistance suddenly increases, it may indicate bag clogging or ineffective cleaning; if the resistance suddenly drops, it is necessary to investigate whether the bag is damaged or the baffle is leaking.

2. Appearance and emission monitoring: Observe whether there is obvious dust emission from the dust collector's discharge port. If so, combined with the resistance data, it can initially determine the bag damage. At the same time, check the dust characteristics in the ash hopper. If there are fibers from the bag mixed in, the machine should be stopped for inspection immediately.

3. Auxiliary system interlock check: Simultaneously check the pulse cleaning system (air pressure, pulse valve operation, and blowing effect), the temperature control system (whether the flue gas temperature is higher than the dew point by 15-20°C to avoid condensation and bag clogging), and the ash discharge system operation status to ensure the compatibility of each system with the operation of the filter bags.

(2) Regular cleaning and maintenance

Based on the dust characteristics (humidity, viscosity, particle size) and operational load, formulate a regular cleaning and maintenance plan to avoid excessive dust attachment on the filter bags:

1. Online cleaning optimization: Adjust the cleaning frequency and pressure based on resistance changes to avoid excessive cleaning (causing filter bag fiber wear) or insufficient cleaning (resulting in dust accumulation and bag clogging). For sticky dust, the cleaning pressure can be appropriately increased (controlled at 0.4-0.6 MPa), reducing the cleaning interval; for fine particle dry dust, the frequency can be reduced to minimize filter bag wear.

2. Offline cleaning treatment: When the dust layer on the filter bag surface is difficult to be removed through online cleaning or the resistance remains high, the bag should be taken offline for cleaning. The cleaning method should match the filter bag material: for polyester and polypropylene bags, compressed air reverse blowing + warm water rinsing (water temperature ≤ 60°C, avoid strong alkaline and acidic cleaning agents) can be used; for fluorosilicone and PTFE high-temperature bags, dry compressed air blowing can be used to avoid water washing damage to the material. After cleaning, it is necessary to thoroughly dry and ensure no residual moisture before reinstallation.

3. Caring for idle filter bags: Spare bags should be stored in a dry, ventilated, and non-corrosive gas-free warehouse, avoiding direct sunlight, with a stacking height not exceeding 3 layers to prevent deformation. Bags stored for more than 6 months should be inspected for fiber elasticity before installation, confirming no aging or brittleness before installation.

(3) Operational adaptation and risk avoidance

Optimizing operational conditions is the core to extend the service life of the filter bags. It is necessary to avoid various factors that damage the filter bags:

- Avoiding excessive dust accumulation on the filter bags

- Preventing dust from adhering to the filter bags

- Minimizing the impact of operational fluctuations on the filter bags

- Preventing damage from high temperatures or corrosive gases

- Ensuring the filter bags are not exposed to direct sunlight or excessive heat

- Avoiding excessive pressure on the filter bags

- Preventing excessive vibration or impact on the filter bags

- Avoiding contamination from chemicals or other substances that could damage the filter bags.

- Strictly control the parameters of flue gas: Avoid the flue gas temperature exceeding the rated tolerance temperature of the bag filter (for example, polyester filter ≤ 130℃, Flu Mes fabric filter ≤ 200℃), and prevent the flue gas temperature from being lower than the dew point causing condensation. This can be achieved through preheating devices and insulation layers for optimization control.

- Control the characteristics of dust: Prohibit dust with excessive particle size (beyond the filtration accuracy of the bag filter) and high humidity (moisture content > 15%) from directly entering the dust collector. If necessary, an additional pre-treatment device (such as a cyclone dust collector, drying device) should be added at the front end.

- Avoid chemical damage: If dealing with corrosive gases (such as acid and alkali gases), select corresponding corrosion-resistant material bags. Regularly check the flue gas composition to prevent accidental leakage that could cause fiber corrosion and breakage of the bag filter.

II. Converter secondary dust removal project replacement operation specifications

When the bag filter is damaged, aged, or clogged and cannot be repaired, it must be replaced in accordance with the operation procedures to avoid damaging equipment components or affecting the subsequent filtration effect due to improper operation. Before replacement, thorough preparations must be made, and the principle of "safety first, standardized operation, tight sealing" must be followed.

(1) Preparations before replacement

1. Safety preparations: After stopping the machine, cut off the power supply of the dust collector and auxiliary systems (fans, pulse valves, unloading machines), hang a "Equipment maintenance, no closing of circuit breaker" warning sign; close the inlet and outlet air doors of the dust collector to ensure the equipment is isolated from the production system; wear protective equipment (dust masks, protective gloves, protective clothing, safety helmets), and if necessary, carry a portable dust detector to confirm that the dust concentration in the working environment is within the standard.

2. Tools and spare parts preparation: Prepare the new bag filter of the corresponding model (ensure the material and specification are the same as the old bag filter, with sufficient quantity), sealing gaskets, wrenches, screwdrivers, compressed air sprayers, vacuum cleaners, etc. Also, check that the new bag filter is free of damage and deformation, and the sealing gasket is intact.

3. Equipment pre-treatment: Open the dust collector maintenance door, ventilate for 15-30 minutes; use a compressed air sprayer (set to low pressure mode) to blow away the remaining dust and fibers in the flower plate and storage room, then wipe clean with a cloth to ensure that the flower plate has no debris, and the sealing surface is flat.

(2) Replacement operation process

1. Remove the old bag filter: Remove the old bag filter one by one, handle it gently to avoid residual fibers in the flower plate holes or storage room; for old bag filters stuck to the flower plate, use tools to gently pry them, do not pull forcefully, to prevent damage to the flower plate.

2. Clean the flower plate and slot: Use a compressed air sprayer (set to low pressure mode) to blow away the remaining dust and fibers in the flower plate holes and slots, then wipe clean with a cloth, ensuring that the slot has no debris, and the sealing surface is flat.

3. Install the new bag filter: Insert the open end of the new bag filter into the flower plate hole, ensure that the bag is fully adhered to the sealing surface of the flower plate, then install the bag frame (the frame must be intact without deformation or burrs to avoid scratching the inner wall of the bag), tighten the pressure ring or clip, ensure the bag is installed firmly and sealed tightly, without looseness or air leakage.

4. Check each storage room: After replacing each storage room, check if the installation positions of all bag filters are consistent, if the pressure ring is tightened, and if there is no misalignment or inclination; if it is a multi-storage room dust collector, replace it one storage room at a time, seal one storage room after replacing it, to avoid cross-contamination.

(3) Replacement inspection and trial operation

1. Close the equipment: After replacement, clean the dust in the maintenance area, close the maintenance door, tighten the bolts, ensure the equipment is sealed well; remove the warning sign, restore the circuit and gas connection.

2. Trial operation detection: Start the dust collector, run it unloaded for 5-10 minutes first, check if the pulse cleaning system operates normally, and there is no air leakage or abnormal noise; then load it for operation, monitor the equipment resistance, discharge status, confirm that there is no dust leakage, and the resistance is stable within the normal range.

3. Record Keeping: Record the replacement time, quantity, reasons for wear and tear of the old bags, and trial operation data. Update the equipment maintenance record to provide a basis for subsequent maintenance.

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