Causes and treatment of high and low temperature corrosion of hot water boilers

Causes and treatment of high and low temperature corrosion of hot water boilers

Corrosion has always been a major factor in damaging the service life of boilers, and is also a problem that boiler manufacturers have been trying to solve. But in the final analysis, it is still necessary to start from the aspects of boiler manufacturing and later operation to avoid the bad situation of corrosion. In the boiler type of hot water boiler, high and low temperature corrosion has always been a difficult problem to overcome, and it is also a headache for users. Today, Zhengzhou Fangkuai Boiler Factory will lead you to find out how to avoid high and low temperature corrosion of hot water boilers.

High and low temperature corrosion of hot water boilers refers to low temperature corrosion and high temperature corrosion.

The low temperature corrosion is formed when the heated surface of the boiler tail is corroded by sulfuric acid, and then sulfur dioxide is generated. At the same time, under the action of the catalyst, sulfur trioxide is further generated. If it meets water vapor in the air, sulfuric acid vapor will be generated. When sulfuric acid vapor condenses on the heated surface of the preheater, there will be low temperature corrosion.

The formation of high-temperature corrosion is that at high temperatures, the tubes in the heating surface of the boiler, on the flue gas side and the steam side, are likely to corrode, mainly because the flue gas corrodes the tube wall.

There are primary and secondary instrument divisions in the boiler, and they are somewhat different, and their uses are also very different. The primary instrument mainly includes pressure gauge, water level gauge and thermometer. There are many secondary instruments, such as safety alarm system, monitoring system and water level control system, etc. The secondary instrument can be configured and increased or decreased according to the actual needs of the user. However, a safety alarm system is necessary, this is to ensure the safety of the boiler operation.

In the type of pressure hot water boilers, galvanized steel pipes can be used in the hot water pipes of the primary circulation system, because these pipes are not easy to deform and rust, and they are also very durable and can guarantee the boiler. Has a longer life.

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