Corrosion and cleaning scheme of utility boiler pipeline

Half of the accidents of boilers, steam turbines and feed water heaters are caused by corrosion. The corrosion of the boiler seriously affects and threatens the safe operation of the boiler equipment, when it is serious, the generator unit is forced to shut down, causing great economic losses.

1、 Corrosion of impurities in water to boiler metal pipes

Although the boiler make-up water has been purified, a small amount of impurities still enter into the boiler. Due to the large evaporation capacity of the boiler, the concentration multiple of boiler water is very high. Half of the concentration multiple of boiler water is dozens to hundreds of times, and the concentration rate of impurities on the evaporation surface of scale deposition is higher, even producing concentrated acid or alkali substances, which is extremely high under high temperature and high pressure It is easy to cause corrosion to the metal pipe of boiler.

2、 Corrosion of fouling on water wall tubes

The thermal system of boiler is also easy to be corroded in the process of operation. First of all, the heat load plays a very important role in the corrosion of boiler. The corrosion of water wall tube, superheater tube and economizer tube is not only the steam water stratification or steam plug, but also the change of raw water quality, the change of water treatment equipment operation condition and the change of treatment mode in boiler The change of boiler operation condition will cause the change of steam and water quality, resulting in the deposition and corrosion of dirt.

When there is dirt inside the boiler water wall tube, it is necessary to use kt-006 color scale remover to remove the dirt in time. Acid pickling corrosion inhibitor has been added into kt-006 color scale remover, so it can be used safely. Then adding passivator and passivating the metal surface after pickling is an important technology to prevent the metal surface from being corroded again in a short time.

According to the requirements of the following aspects, boiler passivation drugs can be selected

1. Passivation process is easy to realize

2. The passivation film will not be the cause of boiler corrosion.

3. The passive film will not affect the quality of water vapor.

4. Economical, convenient to store and use.

5. Passivation solution is easy to handle.

If the water quality is very bad, resulting in serious blockage of the boiler water wall tube, then there is no way to carry out chemical cleaning, because there is no way to establish the circulation system during chemical cleaning. If cleaning, it is necessary to determine which pipes have been blocked by dirt, open each blocked pipe, and then carry out chemical cleaning. The kt-206 pipeline cleaning machine or kt-302 pipeline cleaning machine produced by Anhui KuaiTong pipeline cleaning technology Co., Ltd. is a special equipment for plugging. The kt-206 pipeline cleaning machine can be dredged when 2800kg high-pressure water fails to get through.

3、 Corrosion of water wall tube and steam pipe caused by oxide scale during processing

In the manufacturing process of boiler, the oxide layer on the water supply pipe, steam pipe, water wall pipe and superheater pipe is formed under the high temperature conditions in the manufacturing process. The oxide layer is divided into three layers, one is iron oxide, three iron oxide, three iron oxide. The oxide layer is oxide scale, which is easy to fall off in some cases. Therefore, before the new boiler is put into operation, steam should be used to purge the superheater system to blow off the oxide scale which is easy to fall off, so as to prevent the oxide scale from falling off after putting into operation and causing serious damage to the steam nozzle and blade of steam turbine. How to clean the steel pipe with kt-212 high-speed oxidation knife.