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section and high pressure (HP) pressure section. Each section has a steam drum and an evaporator section where water is converted to steam. This steam then passes through superheaters to further raise the temperature and pressure past the saturation point. The added complexity of multiple pressure HRSG systems is necessary to achieve higher steam temperature, and therefore cycle efficiency, due to the “pinch” phenomenon depicted in Figure 3. However, this improvement comes at a significantly increased complexity and cost derived from the multiple heat exchangers required for the multiple pressure systems. A comparably sized, double-pressure HRSG will be used in the exemplary trade study because its performance closely matches the Echogen EPS100 heat engine. System performance comparisons The performance of the EPS100 system (power output versus ambient temperature) significantly exceeds single-pressure steam systems and is comparable to a double-pressure steam system (Figure 5). All cases shown below for the EPS100 heat engine assume an evaporatively-cooled system condenser. For most climates, the baseline cycle provides a good balance of performance. For high ambient temperature climates, especially where water restrictions are an operating constraint, a high-ambient, fully air-cooled version is under development. The Echogen system can also increase net power production from heat in gas turbine exhaust. For example, net power on 20-50 MWe gas turbines can be increased by up to 30%. Figure 5: Power out versus ambient temperature -- Echogen’s EPS100 heat engine performance is comparable to a double-pressure heat recovery steam system. The simple cycle LM2500 gas turbine (SC) is shown for reference. Smaller system installation footprint Due to the compact equipment set and reduced auxiliary support equipment required, sCO2 systems can be installed in a much smaller footprint than can comparable steam-based 7PDF Image | Echogen Power Systems SCO2
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