Then why is the processed cylinder deformed?


The cylinder is cast, and the cylinder must go through aging treatment after leaving the factory, so that the internal stress generated by the cylinder during the casting process is completely eliminated. If the aging time is short, the processed cylinder will be deformed in the future operation. The force condition of the cylinder during operation is very complicated, except for the static load such as the pressure difference between the gas inside and outside the cylinder and the weight of the parts installed in it.

 

It is also necessary to accept the reaction force to the static part when the steam flows out of the static blade and the acting force to the cylinder under the cold and hot state of various connecting pipes. Under the interaction of these forces, the cylinder is prone to plastic deformation to form leakage, and the load of the cylinder increases or decreases too fast, especially when the temperature changes greatly during rapid start-up, shutdown and working condition changes, incorrect way of warming the cylinder, and premature opening of the insulation layer during shutdown and maintenance, large thermal stresses and deformations occur in the cylinder and on the flange.

The cylinder generates stress in the process of mechanical processing or after repair welding, but does not eliminate the stop tempering treatment of the cylinder, resulting in large residual stress of the cylinder and permanent deformation during operation. In the process of installation or maintenance, due to the reasons of maintenance process and maintenance technology, the shrinkage clearance of inner cylinder, cylinder diaphragm, diaphragm sleeve and steam envelope sleeve is not suitable, or the shrinkage gap of the ear-hanging pressure plate is not suitable, and the great shrinkage force is generated after operation to deform the cylinder.

The used cylinder sealant is of poor quality, too much impurities or the wrong model; If there are hard impurity particles in the cylinder sealant, the sealing surface will be difficult to separate tightly, and the tightening force of the cylinder bolt is lack or the material of the bolt is unqualified. The tightness of the cylinder separation surface is mainly completed by the tightening force of the bolt. The thermal stress and high temperature generated when the unit starts and stops or increases or decreases the load will form the stress relaxation of the bolt.

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