Method for the uninterrupted operation of a gas liquefaction system

Abstract

A method for the uninterrupted operation of a gas liquefaction system is provided, wherein the operation is continuously monitored for at least those users of the refrigerant compressor component which represent a two-digit percentage of the total load on the refrigerant compressor component. A total instantaneously available negative load reserve is calculated, and at least one predetermined turbine is switched off when the load reserve reachable via a frequency regulation of the one or more refrigerant compressors is lower than the energy demand of the largest of the refrigerant compressors and either a refrigerant compressor fails or a speed of frequency change for the power supply network for the gas liquefaction system exceeds a present threshold.

1 .- 4 . (canceled) 
     
     
         5 . A method for interruption-free operation of a gas liquefaction plant comprising
 a power generation module including a plurality of turbine sets;   a transmission module providing power generated in the power generation module to the refrigerant compression module;   a refrigerant compression module including a refrigerant compressor and a drive motor with a rated electrical demand coupled to the refrigerant compressor as an electrical drive for the refrigerant compressor; and   a control system, the control system being connected to the power generation module and to the refrigerant compression module, and in normal operation the power required for the rated demand is provided by partial- or full-load operation of all the turbine sets, wherein the plurality of turbine sets exceeds a minimum plurality of turbine sets necessary to ensure continuity of operation of the refrigerant compression module, the method comprising:   monitoring continuously the operation of at least those consumers in the refrigerant compression module representing a two digit percentage fraction of the total load from the refrigerant compression module;   calculating a total instantaneously available negative load reserve; and   shutting down at least one predetermined turbine when the negative load reserve achievable by frequency regulation of the refrigerant compressor is less than the power demand from the largest of the refrigerant compressors and the refrigerant compressor goes down.   
     
     
         6 . The method as claimed in  claim 5 , wherein an instantaneously available positive load reserve is calculated and a compressor drive speed is lowered in the event of the failure of a turbine set when the positive load reserve is less than the power provided by the turbine set before the failure. 
     
     
         7 . The method as claimed in  claim 6 , wherein at least one predetermined electrical consumer in the gas liquefaction plant is shut down when, after the failure of a turbine set, even a reduced compressor speed does not enable the actual power from the turbine sets to cover the current power demand for the refrigerant compression module. 
     
     
         8 . The method as claimed in  claim 5 , wherein predetermined loads are shed when predefined lower threshold values for the network frequency are reached in the power supply network for the gas liquefaction plant. 
     
     
         9 . The method as claimed in  claim 6 , wherein predetermined loads are shed when predefined lower threshold values for the network frequency are reached in the power supply network for the gas liquefaction plant. 
     
     
         10 . The method as claimed in  claim 7 , wherein predetermined loads are shed when predefined lower threshold values for the network frequency are reached in the power supply network for the gas liquefaction plant. 
     
     
         11 . A method for interruption-free operation of a gas liquefaction plant comprising
 a power generation module including a plurality of turbine sets;   a transmission module providing power generated in the power generation module to the refrigerant compression module;   a refrigerant compression module including a refrigerant compressor and a drive motor with a rated electrical demand coupled to the refrigerant compressor as an electrical drive for the refrigerant compressor; and   a control system, the control system being connected to the power generation module and to the refrigerant compression module, and in normal operation the power required for the rated demand is provided by partial- or full-load operation of all the turbine sets, wherein the plurality of turbine sets exceeds a minimum plurality of turbine sets necessary to ensure continuity of operation of the refrigerant compression module, the method comprising:   monitoring continuously the operation of at least those consumers in the refrigerant compression module representing a two digit percentage fraction of the total load from the refrigerant compression module;   calculating a total instantaneously available negative load reserve; and   shutting down at least one predetermined turbine when the negative load reserve achievable by frequency regulation of the refrigerant compressor is less than the power demand from the largest of the refrigerant compressors and a rate of change in the frequency in the power supply network for the gas liquefaction plant exceeds a prescribed limit.   
     
     
         12 . The method as claimed in  claim 11 , wherein an instantaneously available positive load reserve is calculated and a compressor drive speed is lowered in the event of the failure of a turbine set when the positive load reserve is less than the power provided by the turbine set before the failure. 
     
     
         13 . The method as claimed in  claim 12 , wherein at least one predetermined electrical consumer in the gas liquefaction plant is shut down when, after the failure of a turbine set, even a reduced compressor speed does not enable the actual power from the turbine sets to cover the current power demand for the refrigerant compression module. 
     
     
         14 . The method as claimed in  claim 11 , wherein predetermined loads are shed when predefined lower threshold values for the network frequency are reached in the power supply network for the gas liquefaction plant. 
     
     
         15 . The method as claimed in  claim 12 , wherein predetermined loads are shed when predefined lower threshold values for the network frequency are reached in the power supply network for the gas liquefaction plant. 
     
     
         16 . The method as claimed in  claim 13 , wherein predetermined loads are shed when predefined lower threshold values for the network frequency are reached in the power supply network for the gas liquefaction plant. 
     
     
         17 . A gas liquefaction plant, comprising:
 a power generation module including a plurality of turbine sets;   a transmission module providing power generated in the power generation module to the refrigerant compression module;   a refrigerant compression module including a refrigerant compressor and a drive motor with a rated electrical demand coupled to the refrigerant compressor as an electrical drive for the refrigerant compressor; and   a control system, the control system being connected to the power generation module and to the refrigerant compression module, and in normal operation the power required for the rated demand is provided by partial- or full-load operation of all the turbine sets, wherein the plurality of turbine sets exceeds a minimum plurality of turbine sets necessary to ensure continuity of operation of the refrigerant compression module.