Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
  • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
  • F01D21/04—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to undesired position of rotor relative to stator or to breaking-off of a part of the rotor, e.g. indicating such position
  • F01D21/06—Shutting-down
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
  • F01K21/00—Steam engine plants not otherwise provided for
  • F01K21/04—Steam engine plants not otherwise provided for using mixtures of steam and gas; Plants generating or heating steam by bringing water or steam into direct contact with hot gas
  • F01K21/047—Steam engine plants not otherwise provided for using mixtures of steam and gas; Plants generating or heating steam by bringing water or steam into direct contact with hot gas having at least one combustion gas turbine
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E20/00—Combustion technologies with mitigation potential
  • Y02E20/14—Combined heat and power generation [CHP]

Definitions

• This invention relates generally to improved procedures for shutting down boiler systems, particularly steam injected gas turbine Cheng cycle engines.
• Patent Nos. 4,297,841, 4,417,438 and 4,393,649. This invention relates to improved procedures to be used in the shutdown of dual fluid heat engines utilizing the
• the boiler section (comprising superheater, evaporator and economizer sections) is connected to the gas turbine via the combustion chamber.
• One of the most potentially destructive events for the gas turbine is the intrusion of liquid into the turbine. This event would severely damage the turbine blades. Under normal operating conditions this event is highly unlikely due to the large input of heat by the combustion chamber which would change any liquid to vapor before it entered the turbine. In the case of shutdown, however, the safeguard provided by heat from the combustion chamber is reversed. The compressor, still operating under its inertia as the engine coasts to a halt, is forcing air through the combustion chamber.
• the improvement in shutdown procedure which is the subject of this invention concerns the maintenance of fuel flow to the combustion chamber after the shut-down command has been given and the steam injector valve has been closed. In this manner, the combustion chamber remains a heat source for a short interval after the shutdown signal ' is given to prevent any inopportune condensation of injected steam, thus protecting the system from damage. It is therefore an object of this invention to provide a procedure for shutting down a Cheng cycle system which is easy and requires no additional equipment;
• a shutdown procedure is described which minimizes the potential for damage caused by the condensation of steam in the superheater section, the combustion chamber and the gas turbine
• fuel flow is provided to the combustion chamber for a short time after the steam injector valve is closed. This assures that the temperature of the residual injected steam remains above its condensation point until after it has passed through the combustion chamber and gas turbine
• Figure 1 is a block diagram of one embodiment of the Cheng cycle system.
• a major problem with the previously used shutdown procedure was the potential for the condensation of steam in between the steam injector control valve 18 and the turbine exhaust line 48.
• the steam injector control valve 18 closes but steam is never ⁇ theless trapped between this point and the turbine exhaust line 22.
• the hydrocarbon fuel source control means 46 terminates the flow of fuel to the combustion chamber 36 once the shutdown signal is given, but the air compressor 40 continues to provide compressed air to the combustion chamber 36 due to the inertia of the engine. This compressed air is not being heated as it would be under normal operating conditions in the combustion chamber 36 because the fuel has been shut off.
• the solution to this problem is the subject of this invention, involving an improved shutdown procedure.
• the steam injector control valve 18 is closed.
• the improved procedure eliminates the condensation problem in the following way. Instead of the fuel source control means 46 cutting off fuel flow to the combustion chamber 36 at the same time as when the steam injector control valve 18 is closed, the fuel flow to the combustion chamber 36 is maintained for a short interval while the steam injector control valve is closed. This maintains a high temperature in the combustion chamber 36. This additional heat enables the steam remaining in the system between the steam injector control valve 18 and the core turbine inlet 50 to stay above the condensation temperature The system coasts to a halt, as in the previously used shutdown procedure, once the residual steam has passed through the turbine 52.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Engine Equipment That Uses Special Cycles (AREA)
• Control Of Turbines (AREA)
• Turbine Rotor Nozzle Sealing (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=24907747

Family Applications (1)

Country Status (8)

Families Citing this family (8)

Citations (3)

Family Cites Families (5)

• 1985
  • 1985-04-16 US US06/723,801 patent/US4597256A/en not_active Expired - Lifetime
• 1986
  • 1986-03-31 WO PCT/US1986/000652 patent/WO1986006137A1/en not_active Ceased
  • 1986-03-31 EP EP86902628A patent/EP0216904B1/en not_active Expired
  • 1986-03-31 JP JP61502305A patent/JPS62502700A/ja active Granted
  • 1986-03-31 AU AU57742/86A patent/AU573444B2/en not_active Ceased
  • 1986-03-31 DE DE8686902628T patent/DE3676918D1/de not_active Expired - Fee Related
  • 1986-04-10 CA CA000506311A patent/CA1250438A/en not_active Expired
  • 1986-04-12 CN CN198686102631A patent/CN86102631A/zh active Pending

Patent Citations (3)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events