EP 0308596 B1 19911211 - METHOD FOR THE REGULATION OF THE FEED WATER FLOW IN A STEAM PLANT
Title (en)
METHOD FOR THE REGULATION OF THE FEED WATER FLOW IN A STEAM PLANT
Publication
Application
Priority
CH 365087 A 19870922
Abstract (en)
[origin: JPS6490902A] PURPOSE: To lessen the effect of disturbance by comparing the difference between the inlet steam temperature and the saturation temperature of a water separator with a critical temperature and controlling water supply depending on the superheated steam temperature if the difference is close to zero and depending on the water level if the difference exceeds the critical value. CONSTITUTION: Steam generated from an evaporator 3 is separated by a water separator 4 and fed through steam superheaters 5, 5' to a turbine 10. Temperature of steam entering into the water separator 4 is detected by a detector 16 and if the difference ΔT from a saturation temperature 50 corresponding the signal from a pressure detector 51 exceeds a critical value G, a control element 70 turns a switching element 7 to second contact 37 side thus controlling a water supply pump 2 through a PID controller 32 and a controller 6 based on the superheated steam temperature detected by a detector 30. IF ΔT-G>=0, the element 7 is turned to first contact 27 side and the water supply pump 2 is controlled based on the sum of a signal from a PID controller 22 and a signal from a flowmeter 25 thus ensuring disturbance free switching control depending on dry/wet of steam.
IPC 1-7
IPC 8 full level
F22B 35/10 (2006.01); F22B 35/14 (2006.01); F22D 5/26 (2006.01)
CPC (source: EP US)
F22B 35/101 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR IT SE
DOCDB simple family (publication)
EP 0308596 A1 19890329; EP 0308596 B1 19911211; CH 673697 A5 19900330; DE 3866841 D1 19920123; FI 883601 A0 19880801; FI 883601 A 19890323; FI 90377 B 19931015; FI 90377 C 19940125; JP S6490902 A 19890410; US 4825654 A 19890502
DOCDB simple family (application)
EP 88111049 A 19880711; CH 365087 A 19870922; DE 3866841 T 19880711; FI 883601 A 19880801; JP 22059888 A 19880905; US 23115388 A 19880811