Increased output on full arc admission impulse turbines

Details Increased output on full arc admission impulse turbines Increased output on full arc admission impulse turbines

F - Mech Eng,Light,Heat,Weapons

01

D

F01D 5/26 (2006.01) F01D 17/18 (2006.01)

Patent

CA 2138462

A method and apparatus for improving steam turbine heat rate in a multiple stage steam turbine increases the pressure drop across each stage and increases final feedwater temperature. The method reduces the volumetric flow through each of the stages of the turbine by first determining the optimum pressure drop across a first stage of the turbine, then adjusting the reduced volumetric flow of each succeeding stage to distribute the resultant pressure increase across the multiple stages so as to establish the first stage pressure at about the determined optimum pressure. In one form, the method is implemented by blocking steam flow through at least some spaces between nozzle blades in each stage. The blocked spaces are distributed to avoid impulse excitation of vibration on the rotating blades of each stage.

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