Which heat exchanger manufacturer is good: Boiler auxiliary equipment manufacturers talk about the harm of boiler scale
Release Time:
2020-09-14 12:05
Source:
The main components of boiler scale are some carbonate salts such as Ca(HCO3)2, MgCO3, and CaCO3. Long-term accumulation and thickening not only affect the boiler's heat transfer performance, but more importantly, pose significant safety risks. Below, Boiler Auxiliary Equipment Manufacturers will tell you about the dangers of boiler scale.
1. Waste fuel, reduce boiler thermal efficiency
Because the thermal conductivity of scale is tens to hundreds of times lower than that of steel, when boiler scale is present, the heat transfer performance of the boiler's heating surface deteriorates. The heat released by fuel combustion cannot be effectively transferred to the boiler water, and a large amount of heat is carried away by the flue gas, causing the exhaust gas temperature to rise, increasing exhaust gas heat loss, and reducing the boiler's thermal efficiency. In this case, to ensure the boiler parameters, more fuel must be added to increase the furnace temperature and flue gas temperature, resulting in fuel waste. Some estimate that with 1 mm of scale on the boiler heating surface, fuel waste is about 3%~5%.
2. Affect the safe operation of the boiler
Boiler scale often forms on the boiler heating surface with high heat load. Due to the poor thermal conductivity of the scale, the local temperature of the metal pipe wall increases significantly. When the temperature exceeds the allowable temperature that the metal can withstand, the metal creeps due to overheating, its strength decreases, and under the boiler working pressure, the metal will bulge, puncture, and crack, affecting the safe operation of the boiler.
3. Scale can cause corrosion of the metal under the scale. Under the condition that boiler scale adheres to the boiler heating surface, the boiler water seeps into the holes and crevices of the scale and evaporates rapidly between the deposited scale layer and the boiler heating surface. Under the scale layer, the boiler water can be concentrated to a high concentration, and some substances under high temperature and high concentration conditions will seriously corrode the boiler heating surface, such as NaOH. The scaling and corrosion processes promote each other, which can quickly lead to damage of the metal heating surface and cause boiler pipe rupture accidents.
4. Reduce boiler output
After boiler scaling, due to the deterioration of heat transfer, more fuel is needed to achieve the boiler's rated evaporation or rated heat output. However, with the increase in the thickness of the scale and the furnace volume and grate area being fixed, fuel consumption is limited, so the boiler's output will decrease.
5. Scaling will reduce the boiler's service life
The boiler scale on the boiler heating surface must be thoroughly removed to ensure safe and economical operation of the boiler. Whether manual, mechanical, or chemical descaling methods are used, they will affect the service life of the boiler.
The above is Boiler Auxiliary Equipment Some information about the hazards of boiler scale collected by the manufacturer, hoping it can help you!
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