Operational upset transients in a dual boiling binary cycle geothermal power plant

The effects of operational upsets (such as a valve or pump failure) on a dual boiling binary power plant with isobutane as the working fluid are discussed. These results are based on a mathematical simulation using vendor specifications of the existing components and materials in the 5MW(e) Raft River Pilot Plant. The major problems which can result are excessive heat-up or cool-down rates in the heat exchangers and reverse flow into lower pressure areas. Effects of upsets on plant operation are discussed and appropriate counteractive operator action is recommended.