Low load operation of steam turbines

Details Low load operation of steam turbines Low load operation of steam turbines

1988-11-30

1989-10-03

Ostrager, Allen M.

Power plants

Motive fluid energized by externally applied heat

Process of power production or system operation

60653, 60676, 60665, 60667, F01K 1300

Patent

active

048708232

ABSTRACT:
In the operation of a turbine system composed of apparatus (6,12,14,16) for generating steam and a turbine first stage (4) having inlet nozzles connected to be supplied with steam from the steam generating apparatus (6,12,14,16), the steam generating apparatus (6,12,14,16) being composed of a cascade arrangement of a boiler (6) producing steam at a selected pressure which has an assigned lower limit value, a primary superheater section (12), one or more division valves (14) presenting a steam flow passage having a controllable cross-sectional area, and a secondary superheater section (16) connected between the division valves (14) and the inlet nozzles, a method for reducing the output of the system at low load levels comprising: reducing the cross-sectional area of the steam flow passage presented by the division valves (14); and increasing the rate at which heat is supplied to the steam in the secondary superheater section (16) by an amount coordinated with the reduction imparted to the cross-sectional area of the steam flow passage by the reducing step.

REFERENCES:
patent: 4297848 (1981-11-01), Silvestri, Jr.
patent: 4408458 (1983-10-01), Torii

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