Notice of RetractionResearch on Calculation Method of Governing Stage Off-design Conditions in Consideration of Governing Valve Overlap Degree

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

The calculation method of steam turbine´s stage off-design conditions is an effective means to realize the security and economical efficiency, but at present, research on the calculation method of governing stage off-design conditions in consideration of overlap degree seldom can be found in documents. In order to ensure the lift-flow characteristic curve of governing valve is a continuous smooth curve and approximation to a straight line in steam turbine with nozzle governing, there will be a certain degree of overlap among each governing valve on and off. There is not any consideration about the mentioned point on the calculation method of conventional governing stage off-design conditions, and the simplification leads directly to the calculation results of governing stage off-design conditions inconsistent with the actual running process. Therefore, it is very necessary to do some improvements on methods of calculation. The calculation method of governing stage off-design conditions in consideration of overlap degree is shown in this paper, and we verify its accuracy by the calculation example basing on 600MW steam turbine.