The necessity of cleaning the boiler After a long period of operation, the scale and rust problem will inevitably occur. The main reason for the scale formation of the boiler is that the water has a hardness component. After high temperature and high pressure, it will evaporate and concentrate in the furnace. The series of physical and chemical reactions, Zui finally formed a hard, dense scale on the heated surface. Scale is the main cause of boilers, which is the main cause of boiler accidents. Its harmfulness is mainly manifested in:
Waste a lot of fuel: Because the thermal conductivity of scale is only a few tenths of that of steel, when the heating surface is fouled, the heat transfer will be blocked. In order to maintain a certain output of the boiler, the temperature on the fire side must be increased, thus making the outward Radiation and smoke exhaustion cause heat loss. Due to the different working pressure of the boiler, the type and thickness of the scale are different, and the amount of fuel wasted differently. According to the test and calculation, the thickness of the scale and the fuel loss have the following proportions: When the scale thickness (S) ≥ 1 mm, the fuel is wasted 5~ 13%; ≥ 2mm, waste fuel 13~18%; ≥3mm, waste fuel 18~26%.
It is easy to cause the steel plate and pipeline to be burnt due to overheating: Because the boiler must be kept at a certain working pressure and evaporation after scaling, only the temperature on the fire side is increased, but the thicker the scale, the lower the thermal conductivity and the temperature on the fire side. It will be higher. Generally speaking, the temperature on the fire side of the boiler is around 900 °C, while the temperature on the water side is around 190 °C. When there is no scale, the temperature of the steel sheet is about 230 ° C. Once the scale is about 1 mm, the temperature of the steel sheet is increased by about 140 ° C than when the scale is not. When the temperature reaches 315 °C, the plasticity index of the metal begins to decrease. When it reaches 450 °C, the metal will creep and deform due to overheating. Therefore, boiler fouling is very easy to cause the metal to be burnt.
Increasing maintenance costs and reducing service life: The accident caused by scale due to scale is about one-third of the total number of boiler accidents, or an upward trend, which not only causes damage to equipment, but also threatens personal safety. Therefore, in the case of qualified water supply, the boiler should be strictly controlled to meet the national standard when operating the boiler; and to prevent the formation of scale during operation, and after scaling, it must be treated in time, and the scale in the boiler furnace must be completely prevented and removed. And control the water quality. To solve the above problems, the current zui scientific method is to add a comprehensive performance, comprehensive efficacy of the drug operation and maintenance and regular cleaning descaling in the boiler operation.
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