Chu kỳ bảo trì các loại máy thổi bụi lò hơi (Maintenance Cycle)

Tiếng Việt

chu kỳ bảo trì máy thổi bụi soot blower maintenance

English (original article)

1. Routine Maintenance Schedule (Daily / Weekly / Monthly / Quarterly / Annual, applicable for steam retractable, wall-type & air preheater soot blowers)

1.1 Daily Inspection (On-duty shift)

• Check extension/retraction movement, jamming risk, pipe steam leakage, drain valve draining condition, nozzle ash clogging, local control cabinet indicators and motor temperature; inspect pipeline water hammer.

• Keep steam pipeline drain valves fully open to prevent water ingress damaging blow pipes.

1.2 Weekly Maintenance

1. Lubricate drive chains, guide rails and rollers with high-temperature lithium grease; check and top up gear reducer oil level.

2. Clean inlet steam filter and remove ash deposits on nozzles.

3. Carry out local manual single-trial operation for all soot blowers and calibrate limit switch travel positions.

1.3 Monthly Maintenance

1. Inspect packing seals; tighten or replace graphite packing in case of steam leakage; adjust chain tension.

2. For long-retractable blowers: lubricate front supports and idler bearings; check gearbox oil condition (gearbox oil full replacement once per year).

3. Electrical maintenance: fasten terminal wiring and calibrate travel limit switches.

4. For air preheater blowers: disassemble and clean drain valves of purge pipelines.

1.4 Quarterly Maintenance

1. Conduct wall thickness measurement for soot blower pipes; replace pipes/nozzles if wall wear exceeds 1/2 of original thickness or nozzle aperture increases over 10%.

2. Test motor insulation (qualified value ≥0.5MΩ); inspect wear of reduction gears.

3. Pulse/gas-type soot blowers: replace gas filter element, remove carbon deposit on ignition electrode, adjust electrode gap to 2~3mm.

4. Disassemble and grind sealing surfaces of main steam pressure reducing valve & shut-off valve.

1.5 Annual Overhaul (Synchronized with boiler major maintenance)

1. Complete disassembly of all blowers: replace worn bearings, gears, sprockets and guide wheels; straighten deformed blow pipes.

2. Full valve inspection: grind valve cores and replace gaskets; calibrate all control cabinet components.

3. Complete interlock & program control test for whole system; set blow pressure and travel parameters.

2. Special Maintenance Period for Different Types of Soot Blowers

2.1 Furnace Wall Short Soot Blower (IR type)

• Monthly: lubricate rotating mechanism and turn shaft manually for inspection

• Annual: pull out whole unit to overhaul nozzles and rotary seals

2.2 Long Retractable Soot Blower (IK type, for superheater/reheater/economizer)

• Monthly: maintain packing and bracket bearings

• Semi-annually: inspect inner & outer sleeve abrasion

• Annual: full disassembly and worn parts replacement

2.3 Fixed Air Preheater Soot Blower

• Weekly: clear blocked drain pipes

• Quarterly: dismantle and inspect nozzles against clogging

• Synchronized with air preheater overhaul (every 1~2 years): full pipeline disassembly & inspection

2.4 Acoustic / Pulse Shockwave Soot Blower

• Weekly: drain impurities from air source filter

• Every 3 months: replace filter cartridge and inspect horn vibration components

• Annual: full inspection for gas solenoid valves & ignition system, replace vulnerable parts

3. Operational Blowing Frequency (not maintenance cycle)

• Furnace short blow: once every 4~8h (4h for high-coking coal; 8~12h for high-quality coal)

• Superheater & reheater long blow: once every 12~24h

• Economizer & air preheater blow: once every 24h; once every 12h for high-ash fuel

4. Working Condition Adjustment

For boilers firing high-ash/high-sulfur inferior coal & CFB boilers: shorten all maintenance cycles by 20%~30%.