Abstract
The advanced general electric (GE) LM2500 Cheng cycle is a recent development to improve the performance of the LM2500 STIG cycle. The thermal efficiency increases by 7%, and the complexity of the plant is reduced appreciably due to the fully automated configuration. The system includes a self-regulated pressure HRSG, steam-air cooling of the turbine blades and a fully automated computerized process control to implement fast start-up and shut-down. The system's fast response allows full steam injection within 30 min. The operation is integrated by several layers of microprocessor architectural structure to allow the choice of the most economic operation that follows a fluctuating electric price of local utilities. This results in a reduction of the operating manpower and maintenance costs. The system capital cost is comparable to the simple cycle of the LM2500 GEN SET COGEN systems. Performance of the advanced Cheng cycle using the general electric LM2500 gas turbine indicates that the power output (about 27 MW) and efficiency (between 44 and 45%) remain fairly constant regardless of a high ambient temperature. Existing gas turbine plants can be retrofitted to operate on the Cheng cycle resulting in a true parallel steam and gas turbine combined cycle. Equipment diagrams showing typical one-unit arrangements for the 27.5 MW GE LM2500/CHENG are presented. In addition to power generation, the advanced Cheng cycle is particularly attractive for cogeneration due to its flexible use of excess steam in the combustion chamber.
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