Author:Site Editor Publish Time: 2018-05-07 Origin:Site
The stable first and second steam temperature in the boiler operation has extremely important significance for the safe and economic operation of the unit. When the steam temperature is too high, the metal strengths of the superheater, reheater, steam pipe, turbine cylinder, rotor, etc. will be reduced, which will shorten the service life of the equipment. When severely overheated, the heated surface tube will also be blasted. If the steam temperature is too low, the efficiency of the heat cycle is affected, and the steam humidity at the turbine blades of the steam turbine is too high.
In severe cases, water hammer may be generated and the blade may be broken and damaged. If the steam temperature suddenly rises suddenly and suddenly, in addition to the large thermal stress on the welded joints and connecting parts of the heating surface of the boiler, the relative displacement between the cylinder and the rotor of the steam turbine will also increase, that is, the expansion difference will increase. Even dynamic and static friction between the impeller and the diaphragm can cause severe vibration. In addition, the steam temperature deviation on both sides of the steam turbine is too large, which will cause uneven heating on both sides of the turbine and non-uniform thermal expansion.
Therefore, the steam temperature should be closely monitored, analyzed, and adjusted during boiler operation, and the most reasonable method should be used to control steam temperature stability.