How to maintain the boiler after stopping the furnace

The boiler after the boiler is shut down, the water in the pot is wet, and the outside of the furnace body is eroded and rusted by the soot slag. If the maintenance is not good, the corrosion during the shutdown is often more serious than the operation. How to maintain the boiler after the boiler is shut down?

According to the introduction of Mingyuan Petrochemical technicians, the maintenance after the boiler is shut down is divided into the exterior of the furnace and the anti-corrosion maintenance inside the boiler. The anti-corrosion maintenance in the pot has two kinds of dry maintenance and wet maintenance according to the length of the shutdown.

When the boiler is deactivated for a long time, great attention should be paid to the anti-corrosion maintenance problem outside the furnace. First, after the boiler is cooled, the ash on the heated surface and the ash on the upper part of the grate and the lower part of the furnace must be completely removed. Then keep the flue with a certain amount of natural ventilation. Under normal circumstances, desiccant should be placed in the furnace and flue in order to prevent moisture. If quicklime is used as a desiccant, about 3 kg per cubic meter of furnace or flue should be placed. All venting doors should be closed tightly after placement. The lime should be replaced after it has been powdered. If the location of the boiler room is low, and the ground flooding is severe during the shutdown, a combination of frequent low-fire baking and desiccant placement should be used. If the boiler is shut down for a long time, red sand oil or other anti-corrosive paint is applied to the outer surface of the furnace metal after the soot is completely removed.

As for the anti-corrosion maintenance method of the furnace inside the furnace, it is determined according to the length of the shutdown time. Under normal circumstances, the furnace can be shut down for less than one month of available wet maintenance, and more than one month should be dry maintenance.

Pay attention to the following problems during dry maintenance: the desiccant should not be in direct contact with the metal surface of the boiler, and it can be installed in a container such as an iron plate; after placing the desiccant, it is necessary to close the hand hole and other hole cover, on the steam and water pipes. The valve must be cut off; the quicklime powder should be replaced in time.

When using wet maintenance, it is necessary to pay attention to the use of condensed water, followed by the original furnace water, and again softened water; after adding alkali, the furnace water is heated to 80100 ° C with a slight heat to 23 gauge pressure. Protected for 23 hours, so that the circulation reaches the equilibrium of the alkalinity of the furnace water. When the pressure is reduced, the furnace water is filled up, causing 1.54 gauge pressure, and this pressure is maintained throughout the maintenance period. The alkalinity should be periodically tested and lowered. It should be replenished at any time; in winter, wet maintenance should pay attention to antifreeze, especially the sewage channel and the economizer part; before the boiler is reused, all the alkaline water in the pot should be released, so that the reservoir can be reused. Also rinse with clean water.

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