Hongxin steel ball pointed out that chemical water treatment in power plant is an important production process of power plant, which can minimize the impact on the environment. At present, zero discharge of sewage is the requirement of national environmental protection policy. Recycling treatment and use become the important production technology demand of chemical water treatment in power plant, and the corrosion of system and equipment brought by chemical water is the main factor to ensure production.

　　In the design process of chemical water treatment facilities in power plants, the process performance of equipment is often the focus of attention, while the anti-corrosion measures are relatively lacking. Only when serious corrosion of equipment affects normal operation of power plant, corresponding emergency measures shall be considered. At this time, there are many artificial technical difficulties and obstacles in corrosion protection, which can only play a role of temporary relief. In order to improve the current situation and control the equipment corrosion reasonably, effectively and economically, we must actively deal with the corrosion protection work of the chemical water treatment facilities in the power plant to prevent the corrosion. This paper analyzes the problems existing in the anti-corrosion process of chemical water treatment facilities in power plant, and puts forward the corresponding countermeasures from various aspects.

　　1、 Characteristics of chemical water treatment in power plant

　　The chemical water of power plant is very polluting. Although the situation of environmental protection is becoming more and more serious, the policy requires strict control of industrial wastewater discharged by enterprises, and requires enterprises to recycle and use it to the maximum extent and carry out harmless treatment by themselves, so as to alleviate the environmental pressure caused by wastewater discharge. Therefore, the treatment of chemical water in power plant is very important. Generally speaking, the chemical water treatment system used in power plants in China has the following characteristics:

　　(1) The chemical water treatment system of power plant requires a variety of centralized and various types, and a variety of water quality needs a variety of process systems. These treatment systems are combined into a complex system, so a general control system is needed to manage and control these systems in a centralized way.

　　(2) New water treatment process is adopted to realize diversified treatment means and methods. With the progress of science and technology and the development of society, traditional water treatment methods can not meet the water treatment needs of power plants, so more advanced technology should be used for water treatment.

　　(3) The goal of water treatment system is recycling and environmental protection. The treatment of chemical water in power plant should be carried out cautiously. A little carelessness will cause harm to the environment. The water treatment work should achieve zero discharge of pollutants, save water resources and improve the utilization rate of water resources.

　　2、 Causes of common problems in anti-corrosion process of chemical water treatment facilities in power plant and treatment methods

　　1. Causes and treatment of the corrosion of the rubber lining of the high level acid tank

　　The reason for the corrosion of the lining layer of the acid tank may be that there are other substances mixed in the hydrochloric acid of the water treatment system, such as halogen substitutes with benzene ring which can dissolve and destroy the rubber, so the lining layer of the high-level acid tank is corroded. For the treatment of the corrosion of the lining layer of the high-level acid tank, first of all, confirm whether the hydrochloric acid in the water treatment system is qualified and whether there are other mixtures. Try to purchase the hydrochloric acid from the manufacturers that meet the production standards to avoid the corrosion of the lining layer of the high-level acid tank due to the unqualified hydrochloric acid. Secondly, the hydrochloric acid pipeline needs to be cleaned to ensure that there is no oil in the pipeline. The new hydrochloric acid can only be added after the internal cleaning of the pool is qualified. Third, in order to ensure that the pollutants in the cation bed have been completely discharged without corrosion to the equipment, it is necessary to carry out alkali washing and recovery of the cation bed, and further check and confirm.

　　Finally, if the equipment contains contaminated raw materials, it needs to be removed to reduce the corrosion of the equipment. If the corrosion of the equipment is serious, it is necessary to replace the equipment to ensure the normal operation of water treatment.

　　2. Causes and treatment of corrosion problems in circulating water acidizing system

　　The main reasons for the corrosion of circulating water acid dosing system include the problems in material, installation process and dosing mode. The problem of material quality is the rubber layer in the steel structure tank. The steel structure itself has corrosion resistance, but with rubber, its chemical properties are damaged. The treatment method is to pay attention to the change of chemical properties in the material design. The problem of installation process is sulfuric acid leakage caused by inadequate irrigation test. The treatment method is to set up open pipe as far as possible to facilitate the timely treatment when leakage occurs. The problem of dosing method is that there is too much acid or alkali in neutralization reaction, which causes the corrosion of condenser pipeline. The treatment method is to use metering system to control the acid dosing of circulating water.

　　3. Causes and treatment of corrosion problems in acid alkali neutralization tank and channel

　　At present, there are many power plants that use acid-base neutralization tank to treat waste acid, waste alkali liquid and other wastes. In the process of treatment, it is easy to produce corrosive solution due to various reasons, which will have a greater corrosive effect on acid-base neutralization tank and channel. Therefore, the protection should be strengthened in the chemical water treatment of power plants. For the treatment of the corrosion problems in the acid and alkali neutralization tank and the trench, first of all, attention should be paid to the anti-corrosion construction of the neutralization tank in accordance with the standard requirements. Sometimes there is a certain leakage problem in the material combination part of the acid alkali neutralization tank. If the construction is carried out according to the construction standard, such as pouring the cracks of the resin cement and paying attention to the control of the thickness of the combination layer, the corrosion leakage problem caused by the combination of the block materials can be well avoided. Secondly, the non-standard design and layout of acid and alkali neutralization tank will also cause corrosion problems. Therefore, these problems should be considered in the design process at the beginning, such as the waste water pool and other buildings can not be close together. Finally, the waste water tank and ditch should not be covered as much as possible. If it is to be added, the material with good permeability should be selected as the cover plate, so as to find out the corrosion problem in time and deal with it quickly.

　　4. Other corrosion problems

　　(1) Using iron cover plate as acid-base platform and ditch cover plate of water treatment workshop is easy to form corrosion. For this, some new materials such as extruded glass fiber reinforced plastic can be selected. These materials are more corrosion-resistant than steel, and have a longer service life, making the platform easier to maintain;

　　(2) There will also be a lot of acid mist in the air of the acid and alkali measuring room. These acid mist will be sealed in the room for a long time, which is easy to corrode the wall. For this, the indoor wall can be brushed with anti-corrosion coating to prevent corrosion. At the same time, the windows and doors of the room shall be made of corrosion-resistant materials. In addition, it is better not to install electrical panels, cabinets, switches and other devices in the metering room;

　　(3) Acid storage containers, such as rubber lined tanks and steel tanks, are likely to be corroded when storing acid liquids. When metals are corroded by acid, hydrogen will be produced. These hydrogen will often accumulate in the upper seal of the tank or pipeline. If the tank's physical examination and maintenance personnel carelessly ignore this point, it will be obvious where there is hydrogen, which is very dangerous and easy to cause explosion. Similar There have been explosions in China.

　　In a word, the anti-corrosion process of chemical water treatment facilities in power plant is complex and belongs to a long-term system engineering. According to the above analysis of some typical problems and special cases in the anti-corrosion construction of chemical water treatment facilities in the power plant, Hongxin steel pill Co., Ltd. hopes to contribute to the anti-corrosion of chemical water treatment facilities in the power plant, further extend the service life of chemical water treatment facilities in the power plant, reduce the maintenance cost of facilities and improve the economic benefits of the enterprise.