What are the hazards of excessively high superheated steam temperature in circulating fluidized bed boilers?
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What are the hazards of excessively high superheated steam temperature in circulating fluidized bed boilers?
It can cause damage to the superheaters and steam pipes.
If the temperature exceeds the maximum allowable operating temperature for metal materials, it accelerates the rate of high-temperature creep in these materials, thereby shortening the service life of the tubes in the boiler’s heating surfaces, steam pipes, and even equipment that uses steam such as turbines. In severe cases, the tubes exposed to high temperatures inside the boiler can burst, forcing the boiler to shut down unexpectedly; this may also require the replacement of a large number of tubes, resulting in reduced equipment availability and significant losses.
During boiler operation, if the temperature of the superheated steam is too high, it will cause the temperatures of metals such as those in the superheater, as well as in the turbine cylinder, rotor, and diaphragms, to exceed acceptable levels. This leads to a decrease in their strength, ultimately resulting in damage to the equipment. Therefore, overheating accidents should be prevented during boiler operation.
It’s just like why temperature regulators are needed between the high-temperature superheater and the low-temperature superheater