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KCS 33 Applied to the (Cold) Solar Pond We assume that 54 MW of heat is available from hot oil, at temperatures from 580°F to 460°F. We use 43 MW to produce steam, and 11 MW to superheat the water-ammonia mixture. The high pressure steam turbine generates about 5 MW of shaft power, expanding 162,500 lb/hr from a pressure of 800 psia down to 163 psia. The 100,000 lb/hr of the exhaust is condensed at 163 psia (365°F). The remaining 63,000 lb/hr is further expanded, to a pressure of 82 psia (314°F), and condensed. The low-pressure steam turbine generates about 1 MW of shaft power. The two steam condensers, meanwhile, deliver 37 MW thermal to the water-ammonia mixture in heat exchangers HE-6 and HE-7. The disposition of the 43 MW thermal acquired in the boiler is 6 MW shaft power and 37 MW thermal transferred to the water-ammonia sub-cycle. The water-ammonia mixture acquires 11 MW of heat from the hot oil in the fired superheater. It generates 11.5 MW shaft power, for a total of about 17.5 MW. The low-pressure water-ammonia stream delivers another 37 MW of heat to the upcoming high- pressure water-ammonia stream, before rejecting 37 MW in the final condenser. Total recuperation in the system is almost 75 MW thermal, in heat exchangers HE-2, HE-3, HE- 6, and HE-7. KCS 33 Applied to the (Hot) Solar Pond For the hot case, with hot oil temperatures ranging from 735° down to about 560° F, we add two heat exchangers to the water-ammonia sub-cycle. Both of them use the turbine exhaust. In HE-5, we use the much hotter turbine exhaust to superheat the water-ammonia mixture before we acquire external heat. In HE-4, we use the turbine exhaust in parallel with the two steam condensers to finish the boiling. We acquire 66 MW thermal in the HRSG, generate 12 MW shaft power in two steam turbines, and transfer 54 MW thermal to the water-ammonia sub-cycle through the two steam condensers. We acquire about 27 MW thermal of external heat in the water-ammonia sub-cycle, and the 54 MW thermal received from the steam, for a total of 81.5 MW thermal. We generate 21 MW of shaft power, and reject almost 61 MW thermal in the final condenser. The purely recuperative heat transferred in the water-ammonia sub-cycle is about 66.5 MW. Cold Solar Pond Performance The cold solar pond has a heat source ranging from an inlet of 580°F down to an outlet of 460°F; for the Kalina Cycle, the cooling water temperature ranges from an inlet of 78°F to an outlet of 114.75°F. We assumed that the mass flow of oil was the same as in the hot case, but since the specific heat is a little less, and the temperature span is reduced by a third, we computed a total heat input to the system of 54,272 kW thermal. A-4PDF Image | Modular Trough Power Plant Cycle and Systems Analysis
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