TURBINE GLAND SEAL SYSTEMS – ENGINEERING （汽轮机轴封系统u2014u2014工程）.pdf

TURBINE GLAND SEAL SYSTEMS – ENGINEERING DATA BULLETIN # PVSTGS PAGE 1 OF 3 GENERAL These systems generally consist of single- or two-stage 100% capacity ejectors, single 100% surface-type pre- or inter/aftercondensers, suction steam isolation valves and interconnecting vacuum piping. They are designed to remove air steam from the turbine gland seal area to prevent air from flowing into the condenser on condensing steam turbines. • Power Plant Turbine Requirements MODEL PC23E GLAND SEAL SYSTEM with Quickcheck® Steam Chest Gland Steam ejectors designed to meet the turbine manufacturers specified requirements for dry air leakage and water vapor at the specified vacuum level. These systems are typically two-stage units with inter- aftercondenser, or a single-stage unit with pre-condenser, depending on the operating pressure requirement. Condensate is the most common cooling medium for the condensers. • Commercial Standard Requirements Gland Steam ejectors designed to meet typical HVAC Standards should handle the air leakage specified plus water vapor at the pressure specified by the turbine manufacturer. Single- stage, single-element systems with pre- or aftercondenser are typical. Also common is one, single-stage ejector only on smaller turbines. Condensate or cooling water is used for the condensers.