Enhanced manual start/stop sequencing controls for a stream turbine powered chiller unit
First Claim
1. A method of manually staffing a chiller system driven by a steam turbine, the method comprising:
- manually entering, by an operator, a start command into a control panel of the chiller system to initiate a steam turbine staff sequence;
executing the steam turbine start sequence, wherein executing the steam turbine staff sequence comprises;
performing a steam turbine vibration sensor verification; and
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;
prompting the operator to enter a slow roll command upon completion of the steam turbine staff sequence to initiate a steam turbine slow roll mode operation;
executing the steam turbine slow roll mode operation in response to entry of the slow roll command by the operator;
prompting the operator to enter an acceleration command upon completion of the steam turbine slow roll mode operation to initiate a steam turbine acceleration process; and
executing the steam turbine acceleration process to accelerate the steam turbine to an operational speed in response to entry of the acceleration command by the operator.
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Accused Products
Abstract
A control system and method for interactive startup and shutdown of a steam turbine driven chiller unit is provided. 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 startup control system to assist an operator manually start the steam turbine system and the refrigerant system and a shutdown control system to assist an operator manually shutdown the steam system and the refrigerant system. Both the startup control system and the shutdown control system include logic for performing necessary protective actions and for notifying an operator when to perform required actions.
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Citations
15 Claims
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1. A method of manually staffing a chiller system driven by a steam turbine, the method comprising:
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manually entering, by an operator, a start command into a control panel of the chiller system to initiate a steam turbine staff sequence; executing the steam turbine start sequence, wherein executing the steam turbine staff sequence comprises; performing a steam turbine vibration sensor verification; and 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; prompting the operator to enter a slow roll command upon completion of the steam turbine staff sequence to initiate a steam turbine slow roll mode operation; executing the steam turbine slow roll mode operation in response to entry of the slow roll command by the operator; prompting the operator to enter an acceleration command upon completion of the steam turbine slow roll mode operation to initiate a steam turbine acceleration process; and executing the steam turbine acceleration process to accelerate the steam turbine to an operational speed in response to entry of the acceleration command by the operator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of manually staffing a chiller system driven by a steam turbine, the method comprising:
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manually entering, by an operator, a start command into a control panel of the chiller system to initiate a steam turbine staff sequence; executing the steam turbine staff sequence; prompting the operator to enter a slow roll command upon completion of the steam turbine staff sequence to initiate a steam turbine slow roll mode operation; executing the steam turbine slow roll mode operation in response to entry of the slow roll command by the operator, wherein executing the steam turbine slow roll mode 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; prompting the operator to enter an acceleration command upon completion of the steam turbine slow roll mode operation to initiate a steam turbine acceleration process; and executing the steam turbine acceleration process to accelerate the steam turbine to an operational speed in response to entry of the acceleration command by the operator. - View Dependent Claims (15)
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Specification