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AVIC Yu Hong tell you why to strictly control the boiler make-up water-
(1) to prevent fouling, if the water quality does not meet the standards, and timely and correct treatment, then after a period of operation after the exit is in contact with the water, the heat transfer surface, will generate a solid layer of attachment, scale, scale due to thermal conductivity is poor than metal
To a difference of several hundred times. Therefore, the temperature is too high, causing the metal strength to drop, local deformation. Bubble burst, serious will also cause the burst accident, endanger the safe operation; scale will seriously affect the boiler heat transfer effect, greatly reduce the
The economy, as in the economizer with 1MM thick scale, more fuel consumption 1.5%---2.0%; due to fouling will make the steam turbine condensate is the vacuum degree in gas is reduced, so that the machine heat exchange rate and output decreased. Serious, even to be close to the maintenance of production, therefore, control
Water quality prevention is very important.
(2) to prevent corrosion. The quality of boiler water side economizer, caused by the corrosion of water wall, a water supply pipe, heater, superheater, superheater and steam turbine condenser. Corrosion does not make to shorten the service life of equipment, resulting in economic losses, while corrosion
The object can be transferred into the water to pollute water quality, and thus the scaling on the heating surface is promoted, and the scaling and corrosion are promoted, resulting in a vicious circle of corrosion and scaling.
(3) prevent the accumulation of salt. In boiler water impurities and excess salt, brought out with the vapor deposition in the superheater and steam turbine, this phenomenon is called salt, salt accumulation in the superheater can cause overheating of metal wall or even burst; steam turbine inner product salt will reduce output and efficiency
