(1) If the boiler is scaled during operation, it will seriously affect heat transfer first. Since the thermal conductivity of scale is only a few tenths of that of steel, when the internal surface of the boiler is fouled, the heat generated by fuel combustion is not good. The ground is transmitted to the water side, which causes the exhaust gas temperature to rise, waste fuel, and increase operating costs.
According to the relevant information, the fuel that is wasted after the boiler is fouled has the following proportional relationship: when the thickness of the scale is ≥1mm, the boiler will consume 5-8% of the fuel; when the thickness of the scale is ≥2mm, the boiler will consume more fuel. ~18%; when the thickness of scale is ≥3mm, the boiler will consume 18~26% more fuel.
(2) When the boiler is fouled, the heat of combustion of the fuel cannot be transferred to the water side in time, so that the temperature of the heated surface increases, and if the heated surface of the boiler is operated under over-temperature for a long time, the metal material will creep, bulge, and the strength will decrease. , causing a squib; if the boiler's water pipe is blocked due to a large amount of fouling, the squib will soon occur. Boiler squib one is to endanger people's life and property safety; second, it is necessary to overhaul after bursting, which is time-consuming and laborious, and greatly increases maintenance costs; third, frequent fuel injection and shutdown causes fuel waste; fourth, it will cause other production lines after shutdown. Suspension of production has resulted in greater economic losses.
(3) After the boiler is fouled, it will cause corrosion under the scale of the boiler. The corrosion of the boiler will shorten the service life and endanger the safe operation.
(4) Corrosion of the boiler may cause perforation of the furnace tube and even explosion of the boiler, which seriously threatens the safety of the person and equipment.
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