| OCR Text |
Show where natural gas combustion boosts the temperature to that required by the turbine. The turbine exhaust stream, along with that from the HTTAF, furnishes waste heat to a heat recovery steam generator ( H R S G ) and steam turbine. The overall efficiency of this system exceeds 4 7 % , significantly better than typical P C plants. The baseline plant design is a non site-specific, greenfield power generation plant and includes all facilities required for power production. Consistent with the June, 1993 E P R I T A G T M , the HIPPS plant boundaries for design and cost estimates include all the major operating systems such as the H T T A F unit, heat recovery steam generators, gas turbine, environmental control equipment, auxiliary equipment and all support facilities needed to operate the plant. The baseline cycle is only one case of the family of cycles we have been studying. Our goal is to find the optimum cycle to exploit the HIPPS technology. A chart showing the potential performance of several advanced HIPPS cycles based on the H T T A F is shown in Figure 1. The original baseline system used a heavy frame gas turbine and a 2400 psi/1000°F/1000°F bottoming cycle and gave an overall efficiency of 47.3%. 55 _ 50 54 PC Plants HIPPS GOAL - 4 7% HIPPS 47.3 51.4 50.4 485 49.3 :45 40 35 30 44 35 Typical PC Adv. PC BaseHF Base Aero Base HAT Adv. ST/HF Adv. ST/Aero Adv. HAT Figure. 1. Efficiency of Coal-Fired Systems The Phase II baseline cycle is an advanced aeroderivative gas turbine/combined cycle using the same steam system. In addition, several advanced technology power plants are also under evaluation: • aeroderivative Humid Air Turbine (HAT) cycle • heavy frame turbine/advanced steam combined cycle • advanced aeroderivative/advanced steam combined cycle • advanced aeroderivative Humid Air Turbine (HAT) cycle |
