Precautions for the trial operation of bag filters in Thermal power Plant boilers

Trial Operation Instructions for Bag Filter of Thermal Power Plant Boiler
I. Preface
The three-month-long boiler bag filter project by Qiaoda Environmental Protection has been completed

from design, production, installation to trial operation. Here, we mainly explain the precautions for the trial

operation of the boiler bag filter in Zhi Thermal Power Plant to ensure that the equipment undergoes

comprehensive inspection and testing before being officially put into operation, so as to guarantee the dust

removal efficiency, equipment safety and system stability. Trial operation is a crucial stage for verifying the

performance of equipment. Operators must strictly follow the procedures to avoid potential risks.
Ii. Preparations before Trial Operation
Equipment inspection ‌
Confirm that the dust collector and its supporting equipment (such as fans, pipelines, and valves) are

installed completely without any omissions or damages.
Check the sealing of all flange connections to ensure there is no leakage. The manhole cover and inspection

door should be securely fastened in place.
Clean the debris inside the dust collector (such as welding slag and tool residues), and use compressed air

to blow the ash hopper to prevent blockage.
System verification ‌
Calibrate the test instruments (such as pressure gauges and thermometers) and record the initial data to

ensure the accuracy of the indication.
Verify that the safety devices (such as alarm systems and emergency stop valves) function properly and

comply with the design specifications.
Personnel and resources ‌
Operators need to be familiar with the structure of the equipment and the operation process, and be equipped

with necessary tools and spare parts (such as filter bags, pulse valve diaphragms).
Iii. Trial Operation Process
No-load test run ‌
Start the fan ‌ : Start the induced draft fan under no-load conditions, check the rotation direction, speed and

bearing condition (vibration and temperature), and gradually adjust the damper to the designed air volume.
Pneumatic system test ‌ :
Connect the compressed air (with a pressure of 0.5-0.7 MPa), and check whether the pulse valve and lift valve

operate sensitively and whether the blowing effect is uniform.
Observe the smooth operation of the ash conveying system (such as screw conveyors) and eliminate abnormal

noises.
Duration ‌ : Run no-load for no less than 2 hours, and record key parameters (temperature, pressure).
Load test run ‌
Pre-spray treatment ‌ (before boiler ignition) :
Pre-spray with lime powder or fly ash, and evenly spray the material into the inlet pipe through the induced draft

fan, controlling the inlet wind speed of 12-15 m/s.
Monitor the pressure difference changes. Stop spraying when it reaches 500-800 Pa to prevent excessive ash

accumulation in the ash hopper.
Load adjustment ‌ :
After the boiler is ignited, gradually increase the air volume to keep the inlet air velocity within the allowable range

and avoid overheating or blockage.
Regularly inspect the condition of the filter bags to ensure there is no damage or detachment. Set the cleaning cycle

reasonably (avoid over-cleaning or under-cleaning).
Iv. Key Points to Note
Flue gas temperature control ‌ : Ensure that the inlet flue gas temperature is 10℃-20℃ higher than the dew point to

prevent condensation and corrosion of the filter bags.
Differential pressure monitoring ‌ : real-time record of differential pressure data. Abnormal increase may indicate that

the filter bag is clogged or the ash cleaning has failed, and immediate investigation is required.
Safe operation ‌ :
It is strictly prohibited to force the operation of the equipment when it is abnormal (such as high temperature or leakage).

The equipment must be shut down for maintenance.
Operators must wear protective equipment and abide by the safety regulations of the power plant.
V. Post-Trial Operation Evaluation
Performance confirmation ‌ : Compare the operating data with the design parameters to verify the dust removal efficiency

and system stability.
Fault handling ‌ : Record and analyze the abnormalities that occur during the trial operation (such as filter bag leakage,

valve failure), and formulate rectification measures.
Document update ‌ : Improve the operation manual and incorporate trial operation experience and optimization suggestions.
Vi. Conclusion
Trial operation is the foundation for ensuring the long-term reliable operation of bag filters. Operators need to continuously

monitor the equipment status and combine it with daily maintenance (such as regular ash cleaning and filter bag inspection) to

extend the equipment's lifespan and reduce operational risks.