The boiler is allowed to have a certain overload capacity in the design, and short-time overload operation is allowed. However, in practice, some boilers have a relatively large thermal load and a small boiler capacity, blindly making the boiler under long-term overload conditions. This is extremely unfavorable to the device itself and will seriously affect the useful life of the device.
In overload conditions, in order to generate more steam, more fuel must be used to increase the flow rate of the flue gas, and the convection coefficient of heat on the flue gas side is increased. At the same time, due to the increase of flue gas temperature, the heat transfer temperature difference is increased, thus convective overheating. The increase in the amount of heat absorbed by the device exceeds the increase in load to increase the temperature of the outlet vapor, which is detrimental to the operation of the superheater. Due to the increase in the temperature level of the entire furnace, the working conditions of the heat receiving surfaces are deteriorated, and the long-term over-temperature operation may cause damage to the metal materials. Under overload conditions, high fly ash concentration and high flue gas flow rate cause intense wear.
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