Automatic start/stop sequencing controls for a steam turbine powered chiller unit
First Claim
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1. A method of automatically starting a steam turbine driven chiller system in response to entry of a single command by an operator, the method comprising the steps of:
- executing a steam turbine start sequence;
executing a steam turbine slow roll mode operation, wherein executing a steam turbine slow roll operation comprises;
calculating a slow roll time period for the slow roll mode operation, wherein the slow roll time period is dependent upon a number of stages of the steam turbine and an inlet steam temperature to the steam turbine; and
evacuating the steam turbine exhaust to a desired vacuum in response to the slow roll time period expiring;
executing a steam turbine acceleration process to accelerate the steam turbine to an operational speed; and
wherein the steps of executing a steam turbine start sequence, executing a steam turbine slow roll mode operation, and executing a steam turbine acceleration process are completed by a control program without additional action by an operator.
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Abstract
A control system and method are provided for the automatic startup and shutdown of a steam turbine driven chiller unit. The chiller unit includes an integrated central control panel to control operation of both the steam turbine system and the refrigerant system. The central control panel has a startup control system to automatically start the steam turbine driven chiller unit while performing necessary protective actions and a shutdown control system to automatically stop the steam turbine driven chiller unit while performing necessary protective actions.
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Citations
21 Claims
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1. A method of automatically starting a steam turbine driven chiller system in response to entry of a single command by an operator, the method comprising the steps of:
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executing a steam turbine start sequence; executing a steam turbine slow roll mode operation, wherein executing a steam turbine slow roll operation comprises; calculating a slow roll time period for the slow roll mode operation, wherein the slow roll time period is dependent upon a number of stages of the steam turbine and an inlet steam temperature to the steam turbine; and evacuating the steam turbine exhaust to a desired vacuum in response to the slow roll time period expiring; executing a steam turbine acceleration process to accelerate the steam turbine to an operational speed; and wherein the steps of executing a steam turbine start sequence, executing a steam turbine slow roll mode operation, and executing a steam turbine acceleration process are completed by a control program without additional action by an operator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of automatically starting a steam turbine driven chiller system in response to entry of a single command by an operator, the method comprising the steps of:
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executing a steam turbine start sequence, wherein executing a steam turbine start sequence comprises; performing a steam turbine vibration sensor verification; initiating a pre-lubrication of the steam turbine and a compressor of the chiller system; selecting a hotwell pump from a plurality of hotwell pumps for operation; and starting the selected hotwell pump upon completion of the pre-lubrication of the steam turbine and the compressor; executing a steam turbine slow roll mode operation; executing a steam turbine acceleration process to accelerate the steam turbine to an operational speed; and wherein the steps of executing a steam turbine start sequence, executing a steam turbine slow roll mode operation, and executing a steam turbine acceleration process are completed by a control program without additional action by an operator. - View Dependent Claims (19, 20, 21)
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Specification