Device for precontrolling the feedwater of a cooling-air temperature controller for a cooling-air cooler
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F22D-005/26
F02C-006/00
출원번호
US-0856031
(1997-05-14)
발명자
/ 주소
Olia Hamid,CHX
출원인 / 주소
Asea Brown Boveri AG, CHX
대리인 / 주소
Burns, Doane, Swecker & Mathis, L.L.P.
인용정보
피인용 횟수 :
5인용 특허 :
5
초록▼
The device for precontrolling the feedwater quantity of a cooling-air temperature controller (1) for a once-through cooling-air cooler (2) in combined power plant systems comprises a function element which has as inputs the signals corresponding to the air-outlet desired temperature (.THETA..sub.a s
The device for precontrolling the feedwater quantity of a cooling-air temperature controller (1) for a once-through cooling-air cooler (2) in combined power plant systems comprises a function element which has as inputs the signals corresponding to the air-outlet desired temperature (.THETA..sub.a soll), the air-inlet temperature (.THETA..sub.e), the air volume flow (M), the main steam pressure (p) and the water-inlet temperature (.theta..sub.e), and as outputs the signals of the approximated precontrolled feedwater volume flow (m.sub.FFO) and the controller gain (VR). A correcting quantity depending on the load (L) and the ambient temperature (T.sub.U) is additionally introduced for operation in the unsaturated temperature range.
대표청구항▼
[ What is claimed as new and desired to be secured by: Letters Patent of the United States is:] [1.] A device for precontrolling the feedwater quantity of a cooling-air temperature controller (1) for a once-through cooling-air cooler (2) in power plant systems, it being the case that in the cooling-
[ What is claimed as new and desired to be secured by: Letters Patent of the United States is:] [1.] A device for precontrolling the feedwater quantity of a cooling-air temperature controller (1) for a once-through cooling-air cooler (2) in power plant systems, it being the case that in the cooling-air cooler (2) compressed air (K) from a compressor (32) is cooled and feedwater (W) is heated and evaporated, and that an air volume flow meter with a sensor (5), and a temperature meter with a sensor (6) are arranged upstream of the inlet of the air (K) into the cooling-air cooler (2), and that a further temperature meter with a sensor (7), whose output is connected to the controller (1) in addition to the air-outlet desired temperature (.theta..sub.a soll), is arranged downstream of the outlet of the air (K) from the cooling-air cooler (2), as well as that a main steam pressure gage with a sensor (8) is arranged at the outlet of the cooling-air cooler (2), and a temperature meter with a sensor (9) for the feedwater (W) is arranged at the inlet into the cooling-air cooler (2), and that at an addition point (10) connected downstream of the cooling-air temperature controller (1) a signal corresponding to the desired value of the feedwater volume flow (m.sub.soll) is provided to a feedwater control circuit as a precontrol, whereinthe device comprises a function element (3), which has as inputs the signals corresponding to the air-outlet desired temperature (.theta..sub.a soll), the air-inlet temperature (.theta..sub.e), the air volume flow (M), the main steam pressure (p) and the water-inlet temperature (.theta..sub.e) and has as outputs the signal of the approximately precontrolled feedwater volume flow (m.sub.FFO), which is connected to the addition point (10), and the signal of the controller gain (VR), which is connected to the cooling-air temperature controller (1),it being the case that the signal of the air-outlet desired temperature (.theta..sub.a soll) is connected at a first input to a reference point (11), which is connected at a second input to the output of the temperature meter (6) and whose output is connected to the first input of a multiplier (12),it being the case, furthermore, that the output of the temperature meter (6) is connected to the input of a function generator (13) in which the relationship between the air-inlet temperature (.theta..sub.e) and the specific thermal capacity (C.sub.p) is fixed, and that the output of the function generator (13) is connected to the first input of a further multiplier (14),it being the case, furthermore, that the output of the temperature meter (6) and the output of the main steam pressure gage (8) are connected to the input of a function generator (15) in which the relationships between the air-inlet temperature (.theta..sub.e), the main steam pressure (p) and the steam-outlet enthalpy (h.sub.a) are fixed, and that the output of the function generator (15) is connected as a first input to a reference point (16),it being the case, furthermore, that the output of the temperature meter (9) and the output of the main steam pressure gage (8) are connected to the input of a further function generator (17), in which the relationships between the water-inlet temperature (.theta..sub.e), the main steam pressure (p) and the water-inlet enthalpy (h.sub.e) are fixed, and that the output of the function generator (17) is connected as a second input to the reference point (16) andit being the case, furthermore, that the output of the reference point (16) is connected to the input of a maximum selector (18) to which a signal for the enthalpy difference (h.sub.min) limited to a minimum enthalpy is connected as further input, and that the output of the maximum selector (18) is connected as first input to a divider (19), and that the output of the air volume flow meter (5) is connected as second input to the divider (19), the output of the divider (19) being connected as second input to the multiplier (14), and the output of the multiplier (14) being connected, on the one hand, to the input of a dynamic time-delay element (20) whose output supplies the controller gain (VR) for the cooling-air temperature controller (1), and being connected, on the other hand, as second input to the multiplier (12), whose output supplies the signal for the approximated precontrolled feedwater volume flow (m.sub.FFO).
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이 특허에 인용된 특허 (5)
Tomlinson Leroy O. (Schenectady NY) Smith Raub W. (Clifton Park NY) Sholes John E. (Delanson NY), Closed circuit air cooled gas turbine combined cycle.
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Early Brian J. (Trumbull CT) Reens Daniel J. (Ridgefield CT) Karnoff Robert S. (Monroe CT), Method and apparatus for evaporative cooling of air leading to a gas turbine engine.
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