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A combined cycle steam turbine including a system for providing process extraction steam includes a control system for counteracting the thrust effect of the steam extraction flow at the exhaust of the high pressure section of the steam turbine. The control system includes a valve and piping arrange

A combined cycle steam turbine including a system for providing process extraction steam includes a control system for counteracting the thrust effect of the steam extraction flow at the exhaust of the high pressure section of the steam turbine. The control system includes a valve and piping arrangement for diverting HP exhaust packing leak-off steam from a lower pressure stage to a higher pressure stage of an intermediate pressure section of the steam turbine.

대표청구항 ▼

A combined cycle steam turbine including a system for providing process extraction steam includes a control system for counteracting the thrust effect of the steam extraction flow at the exhaust of the high pressure section of the steam turbine. The control system includes a valve and piping arrange

A combined cycle steam turbine including a system for providing process extraction steam includes a control system for counteracting the thrust effect of the steam extraction flow at the exhaust of the high pressure section of the steam turbine. The control system includes a valve and piping arrangement for diverting HP exhaust packing leak-off steam from a lower pressure stage to a higher pressure stage of an intermediate pressure section of the steam turbine. im 13, wherein the gas composition sensor is at least one of an oxygen sensor and a carbon monoxide sensor. 15. A system according to claim 12, wherein the sensor measures the gas concentration of at least one of oxygen and carbon monoxide. 16. A system according to claim 12, wherein the external combustion engine includes a Stirling cycle engine. 17. A system according to claim 12, wherein the fuel-air ratio in the burner is controlled to obtain a predetermined optimal fuel-air ratio. 18. A system according to claim 17, wherein the optimal fuel-air ratio is based at least on a temperature of the air injected into the combustion chamber of the burner by the blower. 19. A system according to claim 18, wherein the temperature of the air is measured using a temperature sensor placed in a path of the air injected into the combustion chamber of the burner by the blower. 20. A system according to claim 18, wherein the temperature of the air is determined based at least on a temperature of the heater head. 21. A system according to claim 14, wherein the gas composition sensor is a carbon monoxide sensor and the blower drive signal is adjusted to minimize the sensor signal produced by the carbon monoxide sensor. 22. A system according to claim 14, wherein the gas composition sensor is a carbon monoxide sensor and the blower drive signal is adjusted to obtain a gas concentration signal from the carbon monoxide sensor that is below a predetermined value. 23. A method for controlling the fuel-air ratio of a fuel-air mixture in a burner of an external combustion engine having a heater head, the fuel-air mixture formed from a fuel and preheated air provided to the burner, the method comprising: determining the fuel-air ratio in the burner; determining a temperature of the preheated air; and adjusting an air flow rate to obtain a predetermined optimal fuel-air ratio, where the optimal fuel-air ratio is based on at least on the temperature of the preheated air. 24. A method according to claim 23, wherein the temperature of the preheated air is determined using a temperature sensor. 25. A method according to claim 23, wherein the temperature of the preheated air is determined based on at least a temperature of the heater head. 26. A method for igniting a fuel-air mixture in a burner of an external combustion engine, the fuel-air mixture formed from a fuel and air provided to the burner and characterized by a fuel-air ratio, the method comprising: determining an optimal fuel-air ratio for igniting the fuel-air mixture based on at least the temperature of the air used in the fuel-air mixture; setting the fuel-air ratio to an initial ignition fuel-air ratio that contains a higher amount of fuel than the optimal fuel-air ratio by adjusting a fuel flow rate into the burner; maintaining the initial ignition fuel-air ratio until the fuel-air mixture ignites; and reducing the fuel flow rate to obtain the optimal fuel-air ratio. 27. A method for igniting a fuel-air mixture in a burner of an external combustion engine, the burner having a controller and the fuel-air mixture formed from a fuel and air provided to the burner and characterized by a fuel-air ratio, the method comprising: setting the fuel-air ratio of the fuel-air mixture to an ignition fuel-air ratio that is retrieved from a memory area of the controller of the burner; attempting to ignite the fuel-air mixture at the ignition fuel-air ratio; adjusting the fuel air ratio, if the fuel-air mixture does not ignite, by alternately increasing and decreasing the fuel-air ratio above and below the ignition fuel-air ratio until the fuel-air mixture ignites; and storing the fuel-air ratio at which the fuel-air mixture ignites in the memory area as the ignition fuel-air ratio. 28. A method according to claim 27, wherein the fuel-air ratio is adjusted by changing an air flow rate into the burner. 29. A method according to claim 27, wherein the fuel-air ratio is adjusted by chang