| 摘要 |
IP or HP casing for a turbine designed for cogeneration of electric power and heat for district heating purposes, comprising blades carried by a rotor (31) rotating in a stator (32), an inlet steam admission (8'), two exhausts (12' and 17') at different pressures p1 and p2 (p2>p1) feeding a LP section (4) of the turbine, and two further exhausts (15', 20') at pressures p1 and p2 feeding two district heating heat exchangers (22, 23) arranged in series, each of said exchangers providing substantially half of the heating output. Turbine efficiency is improved by providing a single flow (27) from the steam inlet (8'), which is then split into two partial flows (28) with substantially equal steam flow rates as of a flow-splitting point located far enough from the two exhausts at pressure p2 (17', 20') so that changes in flow rates have little or no effect on the steam pressure at said flow-splitting point. |
