TURBINE UNIT Russian patent published in 2000 - IPC

FIELD: thermal engineering; steam-turbine units. SUBSTANCE: turbine unit has double-flow and double-casing low-pressure cylinder with two outlet pipe connections and steam extraction chambers providing communication between internal and external casings to convey steam to low-pressure heater second along condensate flow and to one first along condensate flow, respectively; it also has condenser with two intermediate pipe connections each communicating with respective outlet pipe connection of low-pressure cylinder. Steam extraction chamber for first low-pressure heater is placed between external and internal casings and is common for both flow paths of low-pressure cylinder. Both chambers use coaxial steam extraction pipe connections arranged between outlet pipe connections of low-pressure cylinder. Steam extraction pipe connection running to second heater is mounted inside that running to first heater. Heaters are placed between intermediate pipe connections of condenser; first heater is installed above second one. Condenser is provided with double-flow water inlet to each of two tube bundles symmetrical to its longitudinal axis. Drain line of at least one low-pressure heater runs inside condenser through its steam space and communicates with the latter through water seal. Proposed design of turbine unit provides for arranging low-pressure heaters having different parameters of steam extracted from low-pressure cylinder within sectional area of condenser and for reducing length of steam extraction line running to low-pressure heater. EFFECT: reduced metal input, simplified turbine design, improved efficiency of low-pressure heater. 3 cl, 3 dwg