Natural gas boiler equipment occupies a large proportion in the current industrial and civilian fields. Not only does it have low energy consumption and meets the requirements of environmental protection standards, how long does it take for natural gas-fired boilers to cool? What are the methods for shutdown maintenance? Let’s learn about it with XinLi boiler.

Gas boiler cooling time

　　The natural cooling time after shutdown of a natural gas boiler is related to the size of the furnace. For example, small gas boilers generally take 24 hours to cool, if it is medium-sized or above, it takes 48 hours. If the boiler itself is defective, it takes longer to shut down and cool. For gas boilers with low thermal efficiency and unsatisfactory heat preservation effect, the cooling time is relatively short.

Gas shutdown for maintenance

　　There are many methods for shutting down and maintaining natural gas boilers, as follows:

　　1. Desiccant method. After the boiler is stopped, the waste heat of the boiler is used to dry the interior to remove scale and slag. Finally, a desiccant is placed in the boiler to keep the metal surface dry and prevent corrosion.

　　2. Nitrogen filling method: Fill the boiler water system with nitrogen and maintain a certain positive pressure to prevent air from entering. Because nitrogen is very inactive and non-corrosive, it can prevent boiler shutdown corrosion.

　　3. Ammonia filling method. After the boiler is stopped for water discharge, the entire volume of the boiler is filled with ammonia gas. Ammonia dissolves in the water film on the metal surface to form a corrosion-resistant protective film on the metal surface.

　　4. Paint method, drain the water after the boiler is out of service, remove dirt, and dry the metal surface. Then apply a layer of anti-corrosion paint evenly on the metal surface to prevent the boiler from being out of service and corrosion.

　　The choice of the boiler shutdown maintenance method needs to be flexibly selected according to the length of the shutdown time, so as to improve the boiler maintenance effect so that the restart operation will not delay the production and use.

　　The above is an introduction for you on how long it takes to cool a natural gas-fired boiler, and at the same time tells about the correct shutdown method of a gas-fired boiler, for the reference and browsing of the majority of boiler enterprises.