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What problems should be noticed after the double-cylinder structure of high and medium pressure cylinders? 2020-03-25


The double-layer structure of high-pressure and medium-pressure cylinders has great advantages, but there is also a problem that needs attention.

 

For domestic 200MW and 300MW units, the imperfect insulation of the heat shield and the improper arrangement of the steam outlet between the high-pressure inner and outer cylinders will cause the temperature of the inner wall of the outer cylinder to exceed the design allowable value, and the temperature of the outer wall of the inner cylinder will be high. To an unacceptable value, this situation should be improved, otherwise, the cylinder may be cracked. After the 125MW unit canceled the interlayer cooling steam during normal operation, due to some reasons, the temperature of the inner wall of the outer cylinder was too high.


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