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What are the maintenance methods for air preheaters?
Release time:
2025/11/29
The maintenance methods for air preheaters mainly include the following measures:
1. Regular dust removal
Mechanical ash removal: Use equipment such as pipe cleaning machines to remove accumulated dust. The operation is simple, but requires professional personnel to perform it.
Water-rinsing method: Control the water flow’s intensity and angle to avoid damaging the equipment. After rinsing, ensure thorough drying to prevent rusting.
Chemical ash removal: Use a specialized cleaning agent to dissolve accumulated ash. Careful selection of the chemical agent and precise control of its dosage are essential.
Online ash removal: Install a saw-vibration ash-cleaning device to enable ash removal without shutting down the furnace, thereby reducing equipment wear.
II. Equipment Inspection and Adjustment
Sealing Inspection: Regularly check the radial and axial sealing clearances to ensure there are no air leaks.
Operational Monitoring: Pay close attention to pressure drops and temperature changes at the inlet and outlet of flue gas and air, and address any abnormalities promptly.
Bearing maintenance: Keep the oil levels of guide and thrust bearings at normal levels, and ensure that the temperature remains below 55℃.
III. Corrosion Protection
Coating protection: Utilizes high-temperature and acid-corrosion-resistant coatings (such as enamel or nano-ceramic).
Material Selection: Prioritize corrosion-resistant materials such as stainless steel or composite pipes made of rare-earth alloys.
High-tech Power—Large Air Preheater, Air Heat Exchanger, Enamel Material, Corrosion-Resistant and Wear-Resistant
IV. Operating Procedures
Start-stop procedure: Before starting, perform a turning check; when shutting down, close the damper and blow off ash to prevent secondary combustion.
Single-sided operation: It is necessary to coordinate the output of the induced draft fan and the forced draft fan to maintain a stable airflow.
V. Comprehensive Governance
Fuel optimization: Control fuel quality to reduce the formation of dust and corrosive substances.
Parameter Adjustment: Optimize operating parameters such as boiler oxygen levels and flue gas temperature to reduce the risk of ash accumulation.
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Tel: 86-13961791661 (Bao Zhenyu)
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