초록 ▼

A system and method for operating an integrated gasification combined cycle (IGCC) gas turbine system that utilizes the fuel stream as a means of controlling the operation of the IGCC to achieve a target output and efficiency. The methods and systems enable the IGCC to be operated at reduced output,

A system and method for operating an integrated gasification combined cycle (IGCC) gas turbine system that utilizes the fuel stream as a means of controlling the operation of the IGCC to achieve a target output and efficiency. The methods and systems enable the IGCC to be operated at reduced output, but without a corresponding drop in efficiency as compared to prior art gas turbine systems. Conversely, the IGCC may be operated at higher outputs. The methods and systems achieve the target output and efficiency by adjusting the chemical potential energy, sensible energy, or both of a fuel stream entering the combustion turbine. The chemical potential energy and sensible energy may be manually or automatically controlled.

대표청구항 ▼

We claim: 1. A method for operating an integrated gasification combined cycle gas turbine having a design operation point for a chemical potential energy of a fuel stream, comprising:operating an integrated gasification combined cycle gas turbine at a design operation point output and efficiency;det

We claim: 1. A method for operating an integrated gasification combined cycle gas turbine having a design operation point for a chemical potential energy of a fuel stream, comprising:operating an integrated gasification combined cycle gas turbine at a design operation point output and efficiency;determining a target output and target efficiency, whereby at least one of the target output and the target efficiency is different than the design operation point output and efficiency of the integrated gasification combined cycle gas turbine; andadjusting a chemical potential energy of a fuel stream during operation of the integrated gasification combined cycle gas turbine by changing a heating value of the fuel stream to achieve the target output or target efficiency;wherein changing the heating value of the fuel stream comprises at least one of:a) increasing the heating value of the fuel stream and decreasing a flow rate of the fuel stream to effect at least one of a decrease in output or an increase in efficiency of the integrated gasification combined cycle gas turbine; andb) decreasing the heating value of the fuel stream and increasing a flow rate of the fuel stream to effect at least one of an increase in output or a decrease in efficiency of the integrated gasification combined cycle gas turbine.