Good boiler water treatment is one of the important links to ensure the safe and economic operation of the boiler. Due to the high combustion temperature of oil and gas. And most of the oil, gas boilers (especially imported oil and gas boilers) small size, compact structure, high requirements for water quality, if the water treatment is not good, it will cause boiler scale, corrosion, not only waste fuel and easy to cause blockage, pipe bursts and other accidents, in serious cases will also cause economic losses of boiler scrapping. Therefore, oil-fired and natural gas boilers must seriously improve the boiler water treatment.

　　The basic knowledge of boiler water

　　A natural water impurities harmful to the boiler and the purpose of boiler water treatment

　　There are often a large number of impurities in natural water, which have an impact on the boiler are: suspended substances, colloidal substances and dissolved substances.

　　Suspended material and cavity material by the mud and sand, plant and animal remains and some low-molecular aggregates, etc., is the main factor that makes the water is turbid. If these impurities into the ion exchanger will pollute the exchange resin, affecting the quality of water {such as directly into the boiler, easy to deteriorate the quality of steam, and easy to deposit into the mud scale, blocking the pipeline, so that metal damage due to overheating. Suspended and colloidal substances can be removed by pretreatment methods.

　　Dissolved substances are mainly salts and certain gases dissolved in the water. Natural water, even seemingly very pure tap water also contains a variety of dissolved salts, including calcium and magnesium salts. Hardness is the main source of boiler scaling. As scale is more harmful to boilers, so to remove hardness and prevent scaling is the first task of boiler water treatment, which can be achieved through chemical treatment outside the pot or pot dosing treatment.

　　Dissolved gas in the oil and gas boiler equipment is mainly affected by oxygen and carbon dioxide, they will produce oxygen corrosion and acid corrosion of the boiler, while oxygen and hydrogen ions or a larger role of depolarizing agent, will accelerate the electrochemical corrosion, is one of the important factors in boiler corrosion. Dissolved oxygen can be removed through the deaerator or by adding reducing drugs and other methods. For carbon dioxide, as long as maintain a certain pH and alkalinity of the pot water, it can eliminate its impact.

　　In addition, some regions have high alkalinity in the water source, by the oil and gas boiler combustion heat concentration, pot water alkalinity will become higher and higher, after reaching a certain concentration, it will froth on the evaporation surface, affecting the quality of steam; under certain conditions, high alkalinity will also cause stress concentration parts of the caustic embrittlement and other alkaline corrosion. Therefore, the high alkalinity of water quality needs to be reduced alkali treatment. In addition, the dissolved solids content is too high, will also affect the quality of steam, and in serious cases even cause vapor co-temperature. Should be controlled by reasonable drainage.

　　In short, the purpose of boiler water treatment is to remove harmful impurities, to prevent boiler scaling and corrosion, to maintain good quality steam, to ensure the safe and economic operation of the boiler.