Modeling the application of the Kalina cycle to LEBS power plant
Conference
·
OSTI ID:490301
- Univ. of Pittsburgh, PA (United States)
- Federal Energy Technology Center, Pittsburgh, PA (United States)
The Low Emission Boiler System (LEBS) is an advanced, pulverized coal-fired plant designed to provide power in an economic, efficient, and environmentally sound manner. Thermal efficiencies of LEBS plants are expected to be at least 42% HHV (higher heating value), a significant improvement over conventional systems. Two types of working fluids are being considered by DOE contractors developing the LEBS technology, supercritical steam and ammonia-water mixtures used in the Kalina cycle. In this study, a LEBS-Kalina power cycle was modeled and the predicted performance was compared with previously reported results of a LEBS-supercritical steam power cycle. The working fluid composition for the Kalina cycle was 25% water/75% ammonia. A heat exchange network similar to the Kalina System 5 configuration was incorporated to increase the recuperation of heat. An 85 MW LEBS/Kalina power plant was simulated using AspenPlus, a commercial process simulator. The Schwartzentruber-Renon equation of state was used to model the ammonia-water phase behavior. The thermal efficiency of the LEBS-Kalina. plant was 46.49% HHV (48.64% LHV, lower heating value) operating at turbine inlet conditions of 1050{degrees}F and 2415 psia with cooling water available at 52{degrees}F. The high thermal efficiency of the LEBS-Kalina plant can be attributed to the properties of binary ammonia-water working fluid. A pinch analysis of the plant indicated that the heat exchange network was efficiently designed, as evidenced by the well-matched hot and cold composite curves.
- OSTI ID:
- 490301
- Report Number(s):
- CONF-970310--
- Country of Publication:
- United States
- Language:
- English
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