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Common faults and elimination of environmental protection dust removal equipment

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Common faults and elimination of environmental protection dust removal equipment

Date of release:2019-01-01 Author: Click:

Common faults and elimination of environmental protection dust removal equipment: Do daily maintenance and eliminate faults in time, so that the dust removal equipment can work more stably and efficiently. The following are the parts that need to be checked and the common faults and troubleshooting methods for the bag dust collector.

Common faults and elimination methods of dust collectors and baggage dust collectors:

1. High pressure difference of dust collector

Main reasons and elimination methods:

Incorrect pressure reading: clean the pressure measuring interface / check the air pipe for cracks / check the pressure difference gauge.

The injection system is set incorrectly: increase the injection frequency / compressed air pressure is too low; increase the pressure / check the dryer, clean up (if necessary) / check the pipeline for blockages.

Blow valve failure: check diaphragm valve / check control solenoid valve.

Pulse controller failure: check whether the controller indicates each contact / check the output of each terminal.

Clogged filter bag: condensation on the filter bag (see below); send the filter bag to the laboratory for analysis. Filter bag drying and cleaning treatment / or replacement / reducing air volume / increasing compressed air pressure / adding cleaning frequency / spraying neutral modulation powder to form a protective layer and porous and loose primary cake.

Excessive secondary dusting: continuous emptying of the ash hopper / each row of filter bags / filter cartridges is performed in a random sequence, not sequentially. Check the inlet baffle to make sure it is clean.

2. The air volume is too high

Main reasons and elimination methods:

Pipeline leakage: filling cracks.

Insufficient static pressure: close the damper. Reduce fan speed.

3. Dust escapes from the dust pick-up point

Main reasons and elimination methods:

Small air volume: see above.

Pipeline leakage: Repair cracks so that dust will not bypass the dust collection point.

Pipeline balance is not correct: adjust the branch duct damper.

The design of the suction hood is unreasonable: the open area around the dust collection point is closed. Check whether the flat suction ventilation device overcomes the suction force. Check whether the dust is taken out of the suction hood by the belt.

4. Smoke from the chimney

Main reasons and elimination methods:

Filter bag leakage: Replace if the filter bag is torn or has small holes. Check the installation of the spring ring to ensure tightness.

Flower plate leakage: gap filling or welding seam.

Not enough dust cake: reduce the pressure of compressed air; reduce the cleaning frequency / inject neutral modulation powder to produce primary dust cake.

Excessive porosity in filter bag or filter cartridge: filter bag or filter cartridge for penetration test, and consult the manufacturer.

5. The fan is seriously worn

Main reasons and elimination methods:

Fans handling excessive dust: see above.

Inappropriate fan: Determine whether the fan is suitable for the working conditions; consult the manufacturer.

The fan speed is too high: consult the manufacturer.

6. Serious blower vibration

Main reasons and elimination methods:

Accumulation of wheel blades: The blades are cleared of dust, and check whether the fan handles excessive dust. Check fan installation location / drain condensate or moisture / keep fan dry.

The fan impeller is not suitable for working conditions: consult the manufacturer.

The pulley is uneven: the pulley acts as a power balance.

Bearing wear: Replace.

7. The amount of compressed air is too high

Main reasons and elimination methods:

Over-cleaning cycle: delay cleaning cycle (if possible).

The injection time is too long: reduce the duration (except for the initial impact, all other air volume is wasted; usually the injection is set to 0.1 second).

Excessive pressure: Check diaphragm and spring (see analysis for valve failure).

Tracheal leakage: bubble test and repair.

8. Low compressed air pressure

Main reasons and elimination methods:

Compressed air consumption is too high: see above.

Intratracheal resistance: check for tracheal obstruction.

Dryer clogged: replace the desiccant or bypass the dryer if the operating conditions allow.

Compressor wear: Consult the manufacturer or check the compressor maintenance manual.

9. Small fan motor current / small air volume

Main reasons and elimination methods:

Dust collector with high pressure difference: see above.

Reverse connection of fan and motor pulley: check the drawing and reversely connect the pulley.

Pipeline dust clogging: clean the pipeline and check the gas flow rate.

Fan baffle closed: open the baffle and lock in the open position.

The dust collector lift valve is closed: check the gas path and open the valve plate.

The system static pressure is too high: measure the static pressure at both ends of the fan and check the design specifications, adjust as needed. For the high flow rate inspection pipeline, replace the original bad design.

The fan is not operating within the design requirements: check the inlet structure of the fan to ensure a smooth airflow. Check the blades for wear, repair or replace as needed.

Fan rotates in reverse: connect the wiring on the motor in reverse.

10. Filter bag decomposition

Main reasons and elimination methods:

The filter material is not suitable for this condition: analyze the gas chemistry and consult the filter bag or filter cartridge manufacturer.

The filter material is not suitable for gas components: treat the gas before entering the dust collector; or replace the filter bag or filter cartridge.

Operation at acid dew point temperature: increase gas temperature.

11. Excessive wear on the filter bag

Main reasons and elimination methods:

The flow-control diversion baffle wears out: replace the flow-control baffle.

Excessive dust: Install primary dust collector.

Over-cleaning cycle: extend the cycle time.

The inlet airflow is not properly shared by the filter bag or filter cartridge: consult the manufacturer.

Dust in the clean room / flower plate: clean the flower plate and the inside of the filter bag or filter cartridge; perform a fluorescence test to find the leakage point.

Burrs / corrosion on cage (if used): remove smooth burrs; replace if necessary. If corrosion occurs, consider using cages with anti-corrosion coating.

12. Filter bag burning

Main reasons and elimination methods:

Hot and cold gas layered distribution: use baffles in the pipeline to solve turbulent flow.

Sparks enter the dust collector: install a spark eliminator.

Thermocouple failure: replace and identify the cause of failure.

Cooling device failure: check the design specifications and consult the manufacturer.

13. The filter bag is damaged

Main reason and elimination method:

The filter bag spacing is too close: Adjust the filter bag spacing. According to experience, the filter bag edge spacing is at least the radius of the filter bag itself.

Flue gas temperature exceeds the allowable limit: use high temperature resistant and high strength filter material.

Uneven airflow distribution: the air pressure should not exceed 0.20MPa and should be as low as possible to ensure the cleaning effect.

14. Moisture in the dust collector

Main reasons and elimination methods:

Insufficient heating: Input hot air into the system before starting to process airflow.

There is no blow-off system after shutdown: the system runs the fan for 15 ~ 20 minutes after shutdown.

The shell temperature is lower than the dew point temperature: increase the gas temperature / unit insulation / reduce the moisture in the system to reduce the dew point temperature.

Outside air enters the dust collector: check the housing for leaks and worn door seals.

There is a colder object in the insulation layer: eliminate the direct lining with metal.

There is moisture in the compressed air: check the automatic drain / install a secondary cooler or dryer.

Process conditions become worse: spray into the modulation powder.

15. Materials in the ash hopper

Main reasons and elimination methods:

Moisture in the dust collector: see above.

The design of the ash hopper hinders the movement of materials: installing sonic horns or rapper to promote the movement of materials.

Dust accumulates in the ash bucket: continuous ash discharge; do not store ash in the ash bucket.

Conveyor opening is too small: use wide-flared fluted blades; feeder / star discharge valve does not work or size is insufficient.

16. Excessive emission concentration

Main reason and elimination method:

Causes:

Dust filter bag is damaged: repair and replace the filter bag. The outer diameter of the bag cage and the inner diameter of the filter bag should be kept at a certain distance.

Dust leakage phenomenon: find the reason, deal with it, and reduce the filtering wind speed.

The spraying time is too long or the cleaning is frequent: reduce the spraying time and increase the cleaning cycle.

If the cleaning power is too large, it will generate secondary dust: reduce the cleaning power.

The structure design of some air bags is unreasonable, and the air leakage site occurs during the installation of the pulse valve: appropriately increase the box body and heighten the ash hopper to ensure that the inclination angle of the ash hopper is not less than 60 degrees. In a sticky place, install a vibrator at the dust hopper of the dust collector to prevent the dust from ashing, which is especially suitable for wet weather in the south


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