Guide: What are the commonly used boiler maintenance methods? 1. Pressure maintenance When the boiler is stopped for less than one week, du can use pressure maintenance. That is, before the shutdown process is terminated, the soda system is filled with water, the residual pressure is maintained at (0.05~0.1) mpa, and the boiler water temperature is maintained above 100°C, which can prevent air from entering the boiler. The measures to maintain the pressure and temperature in the boiler are: heating by steam from an adjacent furnace, or regular heating by this furnace.
1. Pressure maintenance
When the furnace is stopped for less than one week, the du can be maintained under pressure. That is, before the shutdown process is terminated, the soda system is filled with water, the residual pressure is maintained at (0.05~0.1)mpa, and the boiler water temperature is maintained above 100℃, which can prevent air from entering the boiler. The measures to maintain the pressure and temperature in the boiler are: heating by steam from an adjacent furnace, or regular heating by this furnace.
2, wet maintenance
When the boiler is out of service for less than one month, wet maintenance can be used. Wet maintenance is to fill the boiler steam system with soft water containing lye, leaving no steam space. Because the aqueous solution with proper alkalinity can form a stable oxide film with the metal surface, thereby preventing the corrosion from continuing. During the wet maintenance process, a micro-fire oven should be used regularly to keep the outside of the heated surface dry. Turn on the pump regularly to circulate the water. Regularly test the alkalinity of the water. If the alkalinity decreases, add lye appropriately.
3, dry maintenance
When the boiler is out of service for a long time, dry maintenance can be used. Dry maintenance refers to the method of placing a desiccant in the pot and furnace for protection. The specific method is: after stopping the boiler, drain the pot water, use the residual temperature of the furnace to dry the boiler, remove the scale and slag in the pot in time, then put the tray containing the desiccant into the drum and on the grate, and finally close all Valves and manholes, hand-hole doors. Regularly check the maintenance status and replace the failed desiccant in time.
4, inflation maintenance
gas filling maintenance can be used for long-term shutdown maintenance. After the boiler is shut down, do not release water, keep the water level at the high water level, take measures to deoxidize the boiler, and then isolate the boiler water from the outside world. Blow in nitrogen or ammonia to maintain the pressure after inflation at (0.2~0.3)mpa. Since nitrogen can generate nitrogen oxide with oxygen, the oxygen cannot contact the steel plate. Ammonia dissolves in water to make the water alkaline, which can effectively prevent oxygen corrosion. Therefore, nitrogen and ammonia are both good preservatives. The air-filling maintenance effect is better, and it requires the boiler steam and water system to have good tightness.
