The maintenance methods for fuel steam generators mainly include the following key steps:
1、 Daily operation and maintenance
1. Water quality control
Adopting a softened water treatment system to ensure that the calcium and magnesium ion content in the feedwater is ≤ 0.03mmol/L, the dissolved oxygen is ≤ 0.1mg/L, and the feedwater temperature is maintained above 20 ℃ to reduce the risk of scaling. Daily bottom discharge to remove sediment impurities.
2. Combustion system maintenance
Disassemble the burner every two months and thoroughly remove carbon deposits from the fuel injectors; Clean the fuel filter and fuel pump filter, and strictly prohibit idling the fuel pump. Regularly test the gap between ignition electrodes (standard value 3 ± 0.5mm).
3. Water level and pressure monitoring
Rinse the glass tube of the water level gauge daily to maintain clear visibility; Manually test the popping pressure of the safety valve every week (to reach 1.04 times the design pressure), and verify the accuracy error of the pressure gauge to be ≤ ± 1.5%.
2、 Shutdown maintenance (selected based on the duration of shutdown)
1. Short term suspension (≤ 1 month)
Adopting alkaline wet maintenance: After draining the boiler water, inject a mixture of 0.1% sodium hydroxide and 0.2% trisodium phosphate, circulate evenly, and then close the valve. Antifreezing is required in winter.
2. Long term discontinuation (>1 month)
Implement dry maintenance: Place a desiccant (8kg/m ³ of quicklime) after drying the furnace body, seal all interfaces to isolate air, and check the moisture release of the desiccant every quarter.
3、 Regular deep maintenance (every 3-6 months)
1. Maintenance of smoke pipe system
Use a rotary ash cleaner to remove carbon deposits inside the smoke pipe, and use high-pressure water guns (pressure ≥ 15MPa) or specialized chemical cleaning agents to treat stubborn ash deposits. Focus on checking whether there is leakage in the weld seam of the pipe plate.
2. Scale removal on the heated surface
Open the handhole/manhole and mechanically scrape off the scale layer inside the drum (if the thickness is greater than 1mm, it needs to be treated immediately). After completion, conduct a 48 hour water pressure test (1.25 times the working pressure).
3. Comprehensive safety inspection
Detect the corrosion depth of the furnace body (welding is required if it exceeds 10% of the original thickness), replace the aging sealing gasket, and verify the accuracy of the oxygen content reading of the flue gas analyzer.
Important reminder: If the exhaust temperature rises abnormally by more than 10 ℃, the furnace should be stopped immediately for inspection, which usually indicates that the smoke pipe is blocked or scaling is worsening. Maintenance operations should be carried out in a fully depressurized and power-off state.