1
Reduce boiler thermal efficiency
After the boiler is fouled, the heat transfer performance of the heating surface becomes poor, and the heat released by fuel combustion cannot be transferred to the boiler water in time. A large amount of heat is taken away by the flue gas, resulting in the exhaust gas temperature is too high, and if the exhaust gas loss increases, the thermal efficiency of the boiler is reduced. In order to maintain the boiler's rated parameters, more fuel must be consumed, and the boiler output is reduced with the same fuel consumption.
1mm limescale
10% fuel
2
Damage to the heating surface
In the boiler with scale, the heat of fuel combustion cannot be quickly transferred to the boiler water due to the poor heat transfer performance, resulting in an increase in the temperature of the furnace and flue gas. Therefore, the temperature difference between the two sides of the heating surface increases, the temperature of the metal increases, the strength decreases, and under the action of the pressure in the pot, bulging and even cracking (i.e., bursting) occurs.
The fouling is too thick, causing the boiler water pipes to deform
The measured data shows that the metal wall temperature increases with the increase of scale thickness, and the thicker the scale, the higher the metal wall temperature, so the greater the probability of accidents.
3
Shorten the service life of the boiler
Limescale containing high valence iron is highly susceptible to underscale corrosion of metals in contact with scale. The corrosion products of iron are easy to re-form scale, which is a vicious circle and continues to develop deep into the metal wall, shortening the service life of the boiler. The wall thickness of the boiler is thinned, dented, and even perforated, which reduces the strength of the boiler and seriously affects the safe operation of the boiler.
4
Produces soda and water together
In addition to improper operation, when the furnace water contains more sodium chloride, sodium phosphate, grease and silicide, or when the organic matter and alkali in the pot water are saponified, in the process of boiling and evaporating the pot water, foam will be produced on the liquid surface, forming a steam-water co-rising, which affects the steam quality and the safe operation of the boiler.
5
Disrupt the water cycle
The boiler is divided into natural circulation and forced circulation, the circulation amount of various boiler water is a certain balance, whether it is rising or descending the tube, there must be enough cut-off area, when the inner wall of the furnace tube is scaled, it will directly lead to the reduction of the cross-sectional area in the tube, the increase of water vapor resistance, the destruction of the normal water circulation of the boiler, and the increase of the temperature of the heated metal wall. When the pipeline is blocked by scale, the water circulation is stopped, and the local furnace pipe is overheated or burst due to local vaporization due to the increase in pipe temperature, which directly threatens the normal operation of the boiler.
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