What are the hazards of silica to the boiler?

Answer:

Steel, in the use of the process, allowing the metal wall temperature below 450 ℃. Boiler in normal operation, the metal wall temperature is generally below 280 ° C. When the boiler heating surface without scale, the metal heat can quickly heat the water,

Scale), the temperature difference between the metal wall and the furnace water will reach about 200 ° C. When the scale is 3 mm, the metal wall temperature will rise to 580 ℃, far more than the allowable temperature of steel

The temperature difference between the two is about 30 ° C, but if the heating surface of the scale, the temperature difference between the two large.For example: when the working pressure of 1.25Mpa boiler heating surface with 1 mm thick scale (mixed

The heat is exhausted by the flue gas, causing the exhaust gas temperature to increase, increase the heat loss of the exhaust heat, so that the boiler thermal efficiency is reduced.Two, causing the metal overheating, the intensity is too low, endanger the safety of the boiler heating surface steel,

, The silica content of ultra-high scale, reduce the boiler thermal efficiency, waste a lot of fuel. Boiler into the scale, the heating surface heat transfer performance deterioration, the fuel combustion heat released can not be quickly passed to the furnace water,