EXTRACTION CONTROL SYSTEM FOR A TURBOGENERATOR SET

• US 3,724,214 A
• Filed: 03/05/1971
• Issued: 04/03/1973
• Est. Priority Date: 03/05/1971
• Status: Expired due to Term

• Current Assignee: Ozro N. Bryant
• Original Assignee: Ozro N. Bryant
• Inventors: Bryant, Ozro N.
• Primary Examiner(s): Cohan, Alan
• Assistant Examiner(s): Ostrager, Allen M.
• Application Number:
  US05/121,317
• Time in Patent Office: 760 Days
• Field of Search: 60/70,73,102,105
• US Class Current: 60/685
• CPC Class Codes: F01K 17/04 for specific purposes other than heating F01K17/06 takes precedence
• CPC Class Codes: F01K 7/345 Control or safety-means particular thereto

Abstract

A turbogenerator set having an extraction control system for maintaining a selected pressure at each steam extraction point regardless of the flow at individual extraction points and irrespective of whether the load on the generator is maintained at a selected load or whether the load is varied, as long as the load on the generator is greater than the power supplied by that portion of the extracted steam which passes through the turbine.

Claims

1. In a turbogenerator set comprising a first turbine unit having a first motive steam inlet control valve and an extraction steam outlet, a second turbine unit having a second motive steam inlet control valve provided with steam by said extraction steam outlet, said extraction steam outlet also being adapted to supply steam to a process having varying steam demands, and a load carried by said first and second turbine units;

a control system for maintaining a set speed on said turbines and supplying said varying demands for steam of said process comprising means responsive to the speed of the turbine unit for jointly governing said first and second inlet control valves, and means responsive to the steam pressure in said extraction steam outlet for opposing and modifying the governing effect of said speed responsive means on said first inlet control valve to supply the varying demands of steam of said process and maintaining a set speed on said turbines.

2. A control system as set forth in claim 1 and further comprising means responsive to load for modifying the governing effect of the speed responsive means jointly on the first and second inlet control valves and being capable of maintaining said load at a selected value, and being capable of supplying the varying demands for steam of the process.

3. A control system as set forth in claim 1 and further comprising means responsive to a system load for modifying the governing effect of the speed responsive means to proportion the load on the turbines relative to said system load, and being capable of supplying the varying demands for steam of the process.

4. In a turbogenerator set as set forth in claim 1, wherein the second turbine unit has a second extraction steam outlet, and further comprises a third turbine unit having a third motive steam inlet control valve provided with steam from said second extraction steam outlet, said second extraction steam outlet also being adapted to supply varying demands for steam of a second process;

the control system having means responsive to the speed of said turbine units for governing all the inlet control valves and means responsive to the steam pressure, in said second extraction steam outlet, for modifying and opposing the governing effect of said speed responsive means on said third inlet control valve, to supply the varying demands for steam of said second process.

5. In a turbogenerator set as set forth in claim 1, wherein the second turbine unit has a second extraction steam outlet, and further comprises a third turbine unit having a third motive steam inlet control valve provided with steam from said second extraction steam outlet, said second extraction steam outlet also being adapted to supply varying demands for steam of a second process;

the control system having means responsive to the speed of the turbine units for governing all the inlet control valves;

means responsive to load for modifying the governing effect of the speed responsive means on all said inlet control valves, and being capable of maintaining the load at a selected value, and means responsive to the steam pressure in said second extraction steam outlet for modifying and opposing said modified governing effect of the speed and load responsive means on said third inlet control valve to supply the varying demands for steam of said second process.

6. In a turbogenerator set as set forth in claim 1, wherein the second turbine unit has a second extracting steam outlet supplying varying demands for steam of a second process and further comprises, a third turbine unit having a third motive steam inlet control valve provided with steam from said second extraction steam outlet, the control system having means responsive to the speed of the turbine units for governing all the inlet control valves, means responsive to a system load for modifying the governing effect of the speed responsive means on all the inlet control valves to proportion the load on the turbine units relative to a system load, and means responsive to the steam pressure in said second extraction outlet for modifying and opposing said modified governing effect of the speed and system load responsive means on said third inlet control valve to supply the varying demands for steam of said second process.

7. In a steam turbogenerator set comprising a high pressure turbine unit having a first extraction steam outlet, which supplies varying demands for steam of a first process, an intermediate turbine unit provided with motive steam by said first outlet and having a second extraction steam outlet, which supplies varying demands for steam of a second process, a low pressure turbine unit provided with motive steam by said second outlet, and a load carried by said turbine units;

a control system for maintaining said load at a selected value with varying demand for steam at selected pressure levels for said processes, comprising a first steam inlet control valve for regulating flow of high pressure motive steam to said high pressure unit, a second steam inlet control valve interposed between said first extraction outlet and said intermediate pressure turbine unit for regulating flow of intermediate pressure motive steam to the latter unit, a third steam inlet control valve interposed between said second extraction steam outlet and said low pressure turbine unit for regulating flow of low pressure motive steam to the low pressure turbine unit, means responsive to speed of said turbine units and providing a speed signal effective to urge each of said control valves in closing direction with increasing speed, means responsive to said load and providing a load signal modifying said speed signal and effective to augment the speed signal with increasing load, means responsive to steam pressure in said first extraction steam outlet and providing a first extraction pressure signal effective to oppose said modified signal and urge said first control valve in opening direction with decreasing extraction steam pressure, and means responsive to steam pressure in said second extraction steam outlet and providing a second extraction pressure signal effective to oppose said modified signal and urge said third control valve in opening direction with increasing extraction steam pressure in opposition to the effect of said modified signal.