CASE HISTORY OF THE YORK ENERGY CENTER INTAKE/BLOWDOWN

摘要

The York Energy Center project in Delta, PA consists of 565 megawatt generatingrnfacility that recovers heat from hot gas exhaust leaving gas turbines. The combustionrnturbines burn either natural gas or low sulfur diesel fuel oil. Combined, these two powerrncycles consume 70–80 percent of the fuel needed by a traditional fossil-fired boiler/rnsteam turbine generator plant. A microtunnel solution to installing the cooling waterrnintake and return was developed by the owner, contractor & tunnel subcontractor. Arn460 m × 1500 mm (1500 ft × 59 in) steel casing was jacked through rock and zero blowrncount river deposits that served as the intake. A 406 mm (16 in) HPDE line was installedrninside the casing to serve as a return. Financial and environmental considerations forrnthe microtunneling solution led to replacing the original twin pipeline trenched design.rnThe TBM was recovered from under Conowingo Lake along the Susquehanna River.