Maintenance of Gas Boilers
1. During operation, pay attention to the following points for gas boilers: (1) Gas boilers are not allowed to burn at positive pressure or have smoke in the furnace, as this can easily damage the coal addition cover; (2) There should be no water accumulation on the bottom horizontal surface of the gas boiler to prevent dampness and corrosion.
2. The gas boiler should be inspected every 2-3 weeks during operation.
3. After every 3 to 6 months of operation, the gas boiler should be shut down for a comprehensive inspection and maintenance: (1) Inspect the interior and exterior of the gas boiler, including the welds of the pressure parts and the corrosion on the inside and outside of the steel plates. If severe defects are found, they should be repaired immediately. If the defects are not severe, they can be repaired during the next shutdown. If any suspicious areas are found that do not affect safe production, a record should be made for future reference; (2) After the inspection is complete, apply boiler bottom paint to the waterline to prevent corrosion.
4. Gas boilers and boiler bases should be painted at least once a year.
5. Maintenance for gas boilers not used for an extended period: There are two methods, dry and wet. For boilers not used for over a month, dry maintenance should be adopted. For those not used for less than a month, wet maintenance can be used.
(1) Dry Maintenance Method: After the boiler is shut down, drain the boiler water, thoroughly clean the internal dirt, and rinse it clean. Dry the firebox with a low flame (be cautious not to use high heat). Then, place blocks of unslaked lime (10-30mm in diameter) in separate trays inside the drum, ensuring they do not touch the metal. The weight of the unslaked lime should be calculated at 8 kg per cubic meter of drum volume. Close all manholes, handholes, and pipeline valves. Check every three months; if the unslaked lime is in a crumbly state, replace it immediately. When the boiler restarts, remove the lime and trays.
(2) Wet Storage Method: After the boiler is shut down, drain the water and thoroughly clean the internal dirt. Rinse it clean, then refill it to the full with treated water. Heat the water to 100°C to expel gases from the water, then close all valves. This method should not be used in cold climates to prevent the water from freezing and damaging the boiler.
