RANKINE CYCLE STEAM POWER PLANT CYCLE Ts Diagram BOILER SUPERHEATER b TURBINE PUMP CONDENSER Entropy, k/(kg K
RANKINE CYCLE
RANKINE CYCLE D 1-2 Saturated or superheated steam enters the turbine at state 1 where it expands isentropically to the exit pressure at state 2 D 2-3 The steam is then condensed at constant pressure and temperature to a saturated liquid, state 3. The heat removed from the steam in the condenser is typically transferred to the cooling water. d 3->4 The saturated liquid then flows through the pump which increases the pressure to the boiler pressure (state 4). d 4-1 the water is first heated to the saturation temperature boiled and typically superheated to state 1 then the whole cycle is repeated
RANKINE CYCLE 1→2 Saturated or superheated steam enters the turbine at state 1, where it expands isentropically to the exit pressure at state 2. 2→3 The steam is then condensed at constant pressure and temperature to a saturated liquid, state 3.The heat removed from the steam in the condenser is typically transferred to the cooling water. 3→4 The saturated liquid then flows through the pump which increases the pressure to the boiler pressure (state 4). 4→1 the water is first heated to the saturation temperature, boiled and typically superheated to state 1. Then the whole cycle is repeated
(1)朗肯循环p-图 P 1∽2汽轮机(膨胀 2→3凝汽器⑦放热 3-4给水泵压缩 4-→1锅炉⑦吸热 3
1 3 4 2 p v (1)朗肯循环p-v图 1→2 汽轮机 s 膨胀 2→3 凝汽器 p 放热 3→4 给水泵 s 压缩 4→1 锅炉 p 吸热
(2)朗肯循环T-s和h-s图 Ⅰ→2汽轮机()膨胀 2→3凝汽器(放热 3→)4给水泵(s)压缩 4→1锅炉@吸热 2
4 3 2 1 T s h s 1 3 4 2 (2) 朗肯循环T-s和h-s图 1→2 汽轮机 s 膨胀 2→3 凝汽器 p 放热 3→4 给水泵 s 压缩 4→1 锅炉 p 吸热
2.朗肯循环功和热的计算 汽轮机作功:w2=h-h2 凝汽器中的定压放热量: q2=h2-h2 水泵绝热压缩耗功: 3-4 h,=h 2 锅炉中的定压吸热量: 1=h1-h
h s 1 3 4 2 2. 朗肯循环功和热的计算 汽轮机作功： ws,1−2 = h1 − h2 凝汽器中的定压放热量： q2 = h2 − h3 水泵绝热压缩耗功： ,3 4 4 3 w h h s − = − 锅炉中的定压吸热量： q1 = h1 − h4